mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 21:24:00 +08:00
23c625ce30
No one is running pre-argonaut. In addition one of the argonaut features (NOSRCADDR) has been required since day one (and a half, 2.6.34 vs 2.6.35) of the kernel client. Allow for the possibility of reusing these feature bits later. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Sage Weil <sage@redhat.com>
4263 lines
109 KiB
C
4263 lines
109 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/ceph/ceph_debug.h>
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#include <linux/fs.h>
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#include <linux/wait.h>
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#include <linux/slab.h>
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#include <linux/gfp.h>
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#include <linux/sched.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/ratelimit.h>
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#include "super.h"
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#include "mds_client.h"
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#include <linux/ceph/ceph_features.h>
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#include <linux/ceph/messenger.h>
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#include <linux/ceph/decode.h>
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#include <linux/ceph/pagelist.h>
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#include <linux/ceph/auth.h>
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#include <linux/ceph/debugfs.h>
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/*
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* A cluster of MDS (metadata server) daemons is responsible for
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* managing the file system namespace (the directory hierarchy and
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* inodes) and for coordinating shared access to storage. Metadata is
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* partitioning hierarchically across a number of servers, and that
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* partition varies over time as the cluster adjusts the distribution
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* in order to balance load.
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*
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* The MDS client is primarily responsible to managing synchronous
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* metadata requests for operations like open, unlink, and so forth.
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* If there is a MDS failure, we find out about it when we (possibly
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* request and) receive a new MDS map, and can resubmit affected
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* requests.
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*
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* For the most part, though, we take advantage of a lossless
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* communications channel to the MDS, and do not need to worry about
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* timing out or resubmitting requests.
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*
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* We maintain a stateful "session" with each MDS we interact with.
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* Within each session, we sent periodic heartbeat messages to ensure
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* any capabilities or leases we have been issues remain valid. If
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* the session times out and goes stale, our leases and capabilities
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* are no longer valid.
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*/
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struct ceph_reconnect_state {
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int nr_caps;
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struct ceph_pagelist *pagelist;
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unsigned msg_version;
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};
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static void __wake_requests(struct ceph_mds_client *mdsc,
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struct list_head *head);
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static const struct ceph_connection_operations mds_con_ops;
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/*
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* mds reply parsing
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*/
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/*
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* parse individual inode info
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*/
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static int parse_reply_info_in(void **p, void *end,
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struct ceph_mds_reply_info_in *info,
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u64 features)
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{
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int err = -EIO;
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info->in = *p;
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*p += sizeof(struct ceph_mds_reply_inode) +
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sizeof(*info->in->fragtree.splits) *
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le32_to_cpu(info->in->fragtree.nsplits);
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ceph_decode_32_safe(p, end, info->symlink_len, bad);
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ceph_decode_need(p, end, info->symlink_len, bad);
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info->symlink = *p;
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*p += info->symlink_len;
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ceph_decode_copy_safe(p, end, &info->dir_layout,
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sizeof(info->dir_layout), bad);
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ceph_decode_32_safe(p, end, info->xattr_len, bad);
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ceph_decode_need(p, end, info->xattr_len, bad);
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info->xattr_data = *p;
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*p += info->xattr_len;
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if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
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ceph_decode_64_safe(p, end, info->inline_version, bad);
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ceph_decode_32_safe(p, end, info->inline_len, bad);
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ceph_decode_need(p, end, info->inline_len, bad);
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info->inline_data = *p;
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*p += info->inline_len;
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} else
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info->inline_version = CEPH_INLINE_NONE;
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if (features & CEPH_FEATURE_MDS_QUOTA) {
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u8 struct_v, struct_compat;
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u32 struct_len;
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/*
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* both struct_v and struct_compat are expected to be >= 1
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*/
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ceph_decode_8_safe(p, end, struct_v, bad);
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ceph_decode_8_safe(p, end, struct_compat, bad);
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if (!struct_v || !struct_compat)
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goto bad;
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ceph_decode_32_safe(p, end, struct_len, bad);
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ceph_decode_need(p, end, struct_len, bad);
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ceph_decode_64_safe(p, end, info->max_bytes, bad);
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ceph_decode_64_safe(p, end, info->max_files, bad);
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} else {
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info->max_bytes = 0;
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info->max_files = 0;
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}
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info->pool_ns_len = 0;
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info->pool_ns_data = NULL;
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if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
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ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
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if (info->pool_ns_len > 0) {
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ceph_decode_need(p, end, info->pool_ns_len, bad);
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info->pool_ns_data = *p;
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*p += info->pool_ns_len;
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}
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}
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return 0;
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bad:
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return err;
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}
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/*
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* parse a normal reply, which may contain a (dir+)dentry and/or a
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* target inode.
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*/
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static int parse_reply_info_trace(void **p, void *end,
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struct ceph_mds_reply_info_parsed *info,
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u64 features)
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{
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int err;
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if (info->head->is_dentry) {
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err = parse_reply_info_in(p, end, &info->diri, features);
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if (err < 0)
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goto out_bad;
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if (unlikely(*p + sizeof(*info->dirfrag) > end))
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goto bad;
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info->dirfrag = *p;
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*p += sizeof(*info->dirfrag) +
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sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
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if (unlikely(*p > end))
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goto bad;
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ceph_decode_32_safe(p, end, info->dname_len, bad);
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ceph_decode_need(p, end, info->dname_len, bad);
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info->dname = *p;
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*p += info->dname_len;
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info->dlease = *p;
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*p += sizeof(*info->dlease);
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}
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if (info->head->is_target) {
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err = parse_reply_info_in(p, end, &info->targeti, features);
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if (err < 0)
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goto out_bad;
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}
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if (unlikely(*p != end))
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goto bad;
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return 0;
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bad:
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err = -EIO;
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out_bad:
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pr_err("problem parsing mds trace %d\n", err);
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return err;
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}
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/*
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* parse readdir results
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*/
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static int parse_reply_info_dir(void **p, void *end,
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struct ceph_mds_reply_info_parsed *info,
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u64 features)
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{
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u32 num, i = 0;
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int err;
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info->dir_dir = *p;
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if (*p + sizeof(*info->dir_dir) > end)
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goto bad;
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*p += sizeof(*info->dir_dir) +
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sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
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if (*p > end)
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goto bad;
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ceph_decode_need(p, end, sizeof(num) + 2, bad);
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num = ceph_decode_32(p);
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{
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u16 flags = ceph_decode_16(p);
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info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
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info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
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info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
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info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
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}
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if (num == 0)
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goto done;
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BUG_ON(!info->dir_entries);
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if ((unsigned long)(info->dir_entries + num) >
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(unsigned long)info->dir_entries + info->dir_buf_size) {
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pr_err("dir contents are larger than expected\n");
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WARN_ON(1);
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goto bad;
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}
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info->dir_nr = num;
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while (num) {
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struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
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/* dentry */
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ceph_decode_need(p, end, sizeof(u32)*2, bad);
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rde->name_len = ceph_decode_32(p);
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ceph_decode_need(p, end, rde->name_len, bad);
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rde->name = *p;
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*p += rde->name_len;
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dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
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rde->lease = *p;
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*p += sizeof(struct ceph_mds_reply_lease);
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/* inode */
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err = parse_reply_info_in(p, end, &rde->inode, features);
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if (err < 0)
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goto out_bad;
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/* ceph_readdir_prepopulate() will update it */
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rde->offset = 0;
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i++;
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num--;
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}
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done:
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if (*p != end)
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goto bad;
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return 0;
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bad:
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err = -EIO;
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out_bad:
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pr_err("problem parsing dir contents %d\n", err);
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return err;
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}
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/*
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* parse fcntl F_GETLK results
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*/
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static int parse_reply_info_filelock(void **p, void *end,
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struct ceph_mds_reply_info_parsed *info,
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u64 features)
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{
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if (*p + sizeof(*info->filelock_reply) > end)
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goto bad;
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info->filelock_reply = *p;
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*p += sizeof(*info->filelock_reply);
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if (unlikely(*p != end))
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goto bad;
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return 0;
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bad:
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return -EIO;
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}
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/*
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* parse create results
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*/
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static int parse_reply_info_create(void **p, void *end,
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struct ceph_mds_reply_info_parsed *info,
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u64 features)
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{
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if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
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if (*p == end) {
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info->has_create_ino = false;
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} else {
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info->has_create_ino = true;
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info->ino = ceph_decode_64(p);
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}
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}
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if (unlikely(*p != end))
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goto bad;
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return 0;
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bad:
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return -EIO;
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}
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/*
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* parse extra results
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*/
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static int parse_reply_info_extra(void **p, void *end,
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struct ceph_mds_reply_info_parsed *info,
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u64 features)
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{
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u32 op = le32_to_cpu(info->head->op);
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if (op == CEPH_MDS_OP_GETFILELOCK)
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return parse_reply_info_filelock(p, end, info, features);
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else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
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return parse_reply_info_dir(p, end, info, features);
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else if (op == CEPH_MDS_OP_CREATE)
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return parse_reply_info_create(p, end, info, features);
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else
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return -EIO;
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}
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/*
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* parse entire mds reply
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*/
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static int parse_reply_info(struct ceph_msg *msg,
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struct ceph_mds_reply_info_parsed *info,
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u64 features)
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{
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void *p, *end;
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u32 len;
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int err;
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info->head = msg->front.iov_base;
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p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
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end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
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/* trace */
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ceph_decode_32_safe(&p, end, len, bad);
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if (len > 0) {
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ceph_decode_need(&p, end, len, bad);
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err = parse_reply_info_trace(&p, p+len, info, features);
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if (err < 0)
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goto out_bad;
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}
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/* extra */
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ceph_decode_32_safe(&p, end, len, bad);
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if (len > 0) {
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ceph_decode_need(&p, end, len, bad);
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err = parse_reply_info_extra(&p, p+len, info, features);
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if (err < 0)
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goto out_bad;
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}
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/* snap blob */
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ceph_decode_32_safe(&p, end, len, bad);
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info->snapblob_len = len;
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info->snapblob = p;
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p += len;
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if (p != end)
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goto bad;
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return 0;
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bad:
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err = -EIO;
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out_bad:
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pr_err("mds parse_reply err %d\n", err);
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return err;
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}
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static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
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{
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if (!info->dir_entries)
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return;
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free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
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}
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/*
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* sessions
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*/
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const char *ceph_session_state_name(int s)
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{
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switch (s) {
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case CEPH_MDS_SESSION_NEW: return "new";
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case CEPH_MDS_SESSION_OPENING: return "opening";
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case CEPH_MDS_SESSION_OPEN: return "open";
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case CEPH_MDS_SESSION_HUNG: return "hung";
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case CEPH_MDS_SESSION_CLOSING: return "closing";
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case CEPH_MDS_SESSION_RESTARTING: return "restarting";
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case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
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case CEPH_MDS_SESSION_REJECTED: return "rejected";
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default: return "???";
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}
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}
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static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
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{
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if (refcount_inc_not_zero(&s->s_ref)) {
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dout("mdsc get_session %p %d -> %d\n", s,
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refcount_read(&s->s_ref)-1, refcount_read(&s->s_ref));
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return s;
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} else {
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dout("mdsc get_session %p 0 -- FAIL\n", s);
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return NULL;
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}
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}
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void ceph_put_mds_session(struct ceph_mds_session *s)
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{
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dout("mdsc put_session %p %d -> %d\n", s,
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refcount_read(&s->s_ref), refcount_read(&s->s_ref)-1);
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if (refcount_dec_and_test(&s->s_ref)) {
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if (s->s_auth.authorizer)
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ceph_auth_destroy_authorizer(s->s_auth.authorizer);
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kfree(s);
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}
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}
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|
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/*
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* called under mdsc->mutex
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*/
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struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
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int mds)
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{
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struct ceph_mds_session *session;
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if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
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return NULL;
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session = mdsc->sessions[mds];
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dout("lookup_mds_session %p %d\n", session,
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refcount_read(&session->s_ref));
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get_session(session);
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return session;
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}
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|
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static bool __have_session(struct ceph_mds_client *mdsc, int mds)
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{
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if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
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return false;
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else
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return true;
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}
|
|
|
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static int __verify_registered_session(struct ceph_mds_client *mdsc,
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struct ceph_mds_session *s)
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{
|
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if (s->s_mds >= mdsc->max_sessions ||
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mdsc->sessions[s->s_mds] != s)
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return -ENOENT;
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return 0;
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}
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|
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/*
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* create+register a new session for given mds.
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* called under mdsc->mutex.
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*/
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static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
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int mds)
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{
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struct ceph_mds_session *s;
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|
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if (mds >= mdsc->mdsmap->m_num_mds)
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return ERR_PTR(-EINVAL);
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|
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s = kzalloc(sizeof(*s), GFP_NOFS);
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if (!s)
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return ERR_PTR(-ENOMEM);
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|
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if (mds >= mdsc->max_sessions) {
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int newmax = 1 << get_count_order(mds + 1);
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struct ceph_mds_session **sa;
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dout("%s: realloc to %d\n", __func__, newmax);
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sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
|
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if (!sa)
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goto fail_realloc;
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if (mdsc->sessions) {
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memcpy(sa, mdsc->sessions,
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mdsc->max_sessions * sizeof(void *));
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kfree(mdsc->sessions);
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}
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mdsc->sessions = sa;
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mdsc->max_sessions = newmax;
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}
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dout("%s: mds%d\n", __func__, mds);
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s->s_mdsc = mdsc;
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s->s_mds = mds;
|
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s->s_state = CEPH_MDS_SESSION_NEW;
|
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s->s_ttl = 0;
|
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s->s_seq = 0;
|
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mutex_init(&s->s_mutex);
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|
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ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
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|
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spin_lock_init(&s->s_gen_ttl_lock);
|
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s->s_cap_gen = 0;
|
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s->s_cap_ttl = jiffies - 1;
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|
|
|
spin_lock_init(&s->s_cap_lock);
|
|
s->s_renew_requested = 0;
|
|
s->s_renew_seq = 0;
|
|
INIT_LIST_HEAD(&s->s_caps);
|
|
s->s_nr_caps = 0;
|
|
s->s_trim_caps = 0;
|
|
refcount_set(&s->s_ref, 1);
|
|
INIT_LIST_HEAD(&s->s_waiting);
|
|
INIT_LIST_HEAD(&s->s_unsafe);
|
|
s->s_num_cap_releases = 0;
|
|
s->s_cap_reconnect = 0;
|
|
s->s_cap_iterator = NULL;
|
|
INIT_LIST_HEAD(&s->s_cap_releases);
|
|
INIT_LIST_HEAD(&s->s_cap_flushing);
|
|
|
|
mdsc->sessions[mds] = s;
|
|
atomic_inc(&mdsc->num_sessions);
|
|
refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
|
|
|
|
ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
|
|
ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
|
|
|
|
return s;
|
|
|
|
fail_realloc:
|
|
kfree(s);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
/*
|
|
* called under mdsc->mutex
|
|
*/
|
|
static void __unregister_session(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *s)
|
|
{
|
|
dout("__unregister_session mds%d %p\n", s->s_mds, s);
|
|
BUG_ON(mdsc->sessions[s->s_mds] != s);
|
|
mdsc->sessions[s->s_mds] = NULL;
|
|
ceph_con_close(&s->s_con);
|
|
ceph_put_mds_session(s);
|
|
atomic_dec(&mdsc->num_sessions);
|
|
}
|
|
|
|
/*
|
|
* drop session refs in request.
|
|
*
|
|
* should be last request ref, or hold mdsc->mutex
|
|
*/
|
|
static void put_request_session(struct ceph_mds_request *req)
|
|
{
|
|
if (req->r_session) {
|
|
ceph_put_mds_session(req->r_session);
|
|
req->r_session = NULL;
|
|
}
|
|
}
|
|
|
|
void ceph_mdsc_release_request(struct kref *kref)
|
|
{
|
|
struct ceph_mds_request *req = container_of(kref,
|
|
struct ceph_mds_request,
|
|
r_kref);
|
|
destroy_reply_info(&req->r_reply_info);
|
|
if (req->r_request)
|
|
ceph_msg_put(req->r_request);
|
|
if (req->r_reply)
|
|
ceph_msg_put(req->r_reply);
|
|
if (req->r_inode) {
|
|
ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
|
|
iput(req->r_inode);
|
|
}
|
|
if (req->r_parent)
|
|
ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
|
|
iput(req->r_target_inode);
|
|
if (req->r_dentry)
|
|
dput(req->r_dentry);
|
|
if (req->r_old_dentry)
|
|
dput(req->r_old_dentry);
|
|
if (req->r_old_dentry_dir) {
|
|
/*
|
|
* track (and drop pins for) r_old_dentry_dir
|
|
* separately, since r_old_dentry's d_parent may have
|
|
* changed between the dir mutex being dropped and
|
|
* this request being freed.
|
|
*/
|
|
ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
|
|
CEPH_CAP_PIN);
|
|
iput(req->r_old_dentry_dir);
|
|
}
|
|
kfree(req->r_path1);
|
|
kfree(req->r_path2);
|
|
if (req->r_pagelist)
|
|
ceph_pagelist_release(req->r_pagelist);
|
|
put_request_session(req);
|
|
ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
|
|
kfree(req);
|
|
}
|
|
|
|
DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
|
|
|
|
/*
|
|
* lookup session, bump ref if found.
|
|
*
|
|
* called under mdsc->mutex.
|
|
*/
|
|
static struct ceph_mds_request *
|
|
lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
|
|
{
|
|
struct ceph_mds_request *req;
|
|
|
|
req = lookup_request(&mdsc->request_tree, tid);
|
|
if (req)
|
|
ceph_mdsc_get_request(req);
|
|
|
|
return req;
|
|
}
|
|
|
|
/*
|
|
* Register an in-flight request, and assign a tid. Link to directory
|
|
* are modifying (if any).
|
|
*
|
|
* Called under mdsc->mutex.
|
|
*/
|
|
static void __register_request(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_request *req,
|
|
struct inode *dir)
|
|
{
|
|
int ret = 0;
|
|
|
|
req->r_tid = ++mdsc->last_tid;
|
|
if (req->r_num_caps) {
|
|
ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
|
|
req->r_num_caps);
|
|
if (ret < 0) {
|
|
pr_err("__register_request %p "
|
|
"failed to reserve caps: %d\n", req, ret);
|
|
/* set req->r_err to fail early from __do_request */
|
|
req->r_err = ret;
|
|
return;
|
|
}
|
|
}
|
|
dout("__register_request %p tid %lld\n", req, req->r_tid);
|
|
ceph_mdsc_get_request(req);
|
|
insert_request(&mdsc->request_tree, req);
|
|
|
|
req->r_uid = current_fsuid();
|
|
req->r_gid = current_fsgid();
|
|
|
|
if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
|
|
mdsc->oldest_tid = req->r_tid;
|
|
|
|
if (dir) {
|
|
ihold(dir);
|
|
req->r_unsafe_dir = dir;
|
|
}
|
|
}
|
|
|
|
static void __unregister_request(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_request *req)
|
|
{
|
|
dout("__unregister_request %p tid %lld\n", req, req->r_tid);
|
|
|
|
/* Never leave an unregistered request on an unsafe list! */
|
|
list_del_init(&req->r_unsafe_item);
|
|
|
|
if (req->r_tid == mdsc->oldest_tid) {
|
|
struct rb_node *p = rb_next(&req->r_node);
|
|
mdsc->oldest_tid = 0;
|
|
while (p) {
|
|
struct ceph_mds_request *next_req =
|
|
rb_entry(p, struct ceph_mds_request, r_node);
|
|
if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
|
|
mdsc->oldest_tid = next_req->r_tid;
|
|
break;
|
|
}
|
|
p = rb_next(p);
|
|
}
|
|
}
|
|
|
|
erase_request(&mdsc->request_tree, req);
|
|
|
|
if (req->r_unsafe_dir &&
|
|
test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
|
|
struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
|
|
spin_lock(&ci->i_unsafe_lock);
|
|
list_del_init(&req->r_unsafe_dir_item);
|
|
spin_unlock(&ci->i_unsafe_lock);
|
|
}
|
|
if (req->r_target_inode &&
|
|
test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
|
|
struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
|
|
spin_lock(&ci->i_unsafe_lock);
|
|
list_del_init(&req->r_unsafe_target_item);
|
|
spin_unlock(&ci->i_unsafe_lock);
|
|
}
|
|
|
|
if (req->r_unsafe_dir) {
|
|
iput(req->r_unsafe_dir);
|
|
req->r_unsafe_dir = NULL;
|
|
}
|
|
|
|
complete_all(&req->r_safe_completion);
|
|
|
|
ceph_mdsc_put_request(req);
|
|
}
|
|
|
|
/*
|
|
* Walk back up the dentry tree until we hit a dentry representing a
|
|
* non-snapshot inode. We do this using the rcu_read_lock (which must be held
|
|
* when calling this) to ensure that the objects won't disappear while we're
|
|
* working with them. Once we hit a candidate dentry, we attempt to take a
|
|
* reference to it, and return that as the result.
|
|
*/
|
|
static struct inode *get_nonsnap_parent(struct dentry *dentry)
|
|
{
|
|
struct inode *inode = NULL;
|
|
|
|
while (dentry && !IS_ROOT(dentry)) {
|
|
inode = d_inode_rcu(dentry);
|
|
if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
|
|
break;
|
|
dentry = dentry->d_parent;
|
|
}
|
|
if (inode)
|
|
inode = igrab(inode);
|
|
return inode;
|
|
}
|
|
|
|
/*
|
|
* Choose mds to send request to next. If there is a hint set in the
|
|
* request (e.g., due to a prior forward hint from the mds), use that.
|
|
* Otherwise, consult frag tree and/or caps to identify the
|
|
* appropriate mds. If all else fails, choose randomly.
|
|
*
|
|
* Called under mdsc->mutex.
|
|
*/
|
|
static int __choose_mds(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_request *req)
|
|
{
|
|
struct inode *inode;
|
|
struct ceph_inode_info *ci;
|
|
struct ceph_cap *cap;
|
|
int mode = req->r_direct_mode;
|
|
int mds = -1;
|
|
u32 hash = req->r_direct_hash;
|
|
bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
|
|
|
|
/*
|
|
* is there a specific mds we should try? ignore hint if we have
|
|
* no session and the mds is not up (active or recovering).
|
|
*/
|
|
if (req->r_resend_mds >= 0 &&
|
|
(__have_session(mdsc, req->r_resend_mds) ||
|
|
ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
|
|
dout("choose_mds using resend_mds mds%d\n",
|
|
req->r_resend_mds);
|
|
return req->r_resend_mds;
|
|
}
|
|
|
|
if (mode == USE_RANDOM_MDS)
|
|
goto random;
|
|
|
|
inode = NULL;
|
|
if (req->r_inode) {
|
|
if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
|
|
inode = req->r_inode;
|
|
ihold(inode);
|
|
} else {
|
|
/* req->r_dentry is non-null for LSSNAP request */
|
|
rcu_read_lock();
|
|
inode = get_nonsnap_parent(req->r_dentry);
|
|
rcu_read_unlock();
|
|
dout("__choose_mds using snapdir's parent %p\n", inode);
|
|
}
|
|
} else if (req->r_dentry) {
|
|
/* ignore race with rename; old or new d_parent is okay */
|
|
struct dentry *parent;
|
|
struct inode *dir;
|
|
|
|
rcu_read_lock();
|
|
parent = req->r_dentry->d_parent;
|
|
dir = req->r_parent ? : d_inode_rcu(parent);
|
|
|
|
if (!dir || dir->i_sb != mdsc->fsc->sb) {
|
|
/* not this fs or parent went negative */
|
|
inode = d_inode(req->r_dentry);
|
|
if (inode)
|
|
ihold(inode);
|
|
} else if (ceph_snap(dir) != CEPH_NOSNAP) {
|
|
/* direct snapped/virtual snapdir requests
|
|
* based on parent dir inode */
|
|
inode = get_nonsnap_parent(parent);
|
|
dout("__choose_mds using nonsnap parent %p\n", inode);
|
|
} else {
|
|
/* dentry target */
|
|
inode = d_inode(req->r_dentry);
|
|
if (!inode || mode == USE_AUTH_MDS) {
|
|
/* dir + name */
|
|
inode = igrab(dir);
|
|
hash = ceph_dentry_hash(dir, req->r_dentry);
|
|
is_hash = true;
|
|
} else {
|
|
ihold(inode);
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
|
|
(int)hash, mode);
|
|
if (!inode)
|
|
goto random;
|
|
ci = ceph_inode(inode);
|
|
|
|
if (is_hash && S_ISDIR(inode->i_mode)) {
|
|
struct ceph_inode_frag frag;
|
|
int found;
|
|
|
|
ceph_choose_frag(ci, hash, &frag, &found);
|
|
if (found) {
|
|
if (mode == USE_ANY_MDS && frag.ndist > 0) {
|
|
u8 r;
|
|
|
|
/* choose a random replica */
|
|
get_random_bytes(&r, 1);
|
|
r %= frag.ndist;
|
|
mds = frag.dist[r];
|
|
dout("choose_mds %p %llx.%llx "
|
|
"frag %u mds%d (%d/%d)\n",
|
|
inode, ceph_vinop(inode),
|
|
frag.frag, mds,
|
|
(int)r, frag.ndist);
|
|
if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
|
|
CEPH_MDS_STATE_ACTIVE)
|
|
goto out;
|
|
}
|
|
|
|
/* since this file/dir wasn't known to be
|
|
* replicated, then we want to look for the
|
|
* authoritative mds. */
|
|
mode = USE_AUTH_MDS;
|
|
if (frag.mds >= 0) {
|
|
/* choose auth mds */
|
|
mds = frag.mds;
|
|
dout("choose_mds %p %llx.%llx "
|
|
"frag %u mds%d (auth)\n",
|
|
inode, ceph_vinop(inode), frag.frag, mds);
|
|
if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
|
|
CEPH_MDS_STATE_ACTIVE)
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
cap = NULL;
|
|
if (mode == USE_AUTH_MDS)
|
|
cap = ci->i_auth_cap;
|
|
if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
|
|
cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
|
|
if (!cap) {
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
iput(inode);
|
|
goto random;
|
|
}
|
|
mds = cap->session->s_mds;
|
|
dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
|
|
inode, ceph_vinop(inode), mds,
|
|
cap == ci->i_auth_cap ? "auth " : "", cap);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
out:
|
|
iput(inode);
|
|
return mds;
|
|
|
|
random:
|
|
mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
|
|
dout("choose_mds chose random mds%d\n", mds);
|
|
return mds;
|
|
}
|
|
|
|
|
|
/*
|
|
* session messages
|
|
*/
|
|
static struct ceph_msg *create_session_msg(u32 op, u64 seq)
|
|
{
|
|
struct ceph_msg *msg;
|
|
struct ceph_mds_session_head *h;
|
|
|
|
msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
|
|
false);
|
|
if (!msg) {
|
|
pr_err("create_session_msg ENOMEM creating msg\n");
|
|
return NULL;
|
|
}
|
|
h = msg->front.iov_base;
|
|
h->op = cpu_to_le32(op);
|
|
h->seq = cpu_to_le64(seq);
|
|
|
|
return msg;
|
|
}
|
|
|
|
static void encode_supported_features(void **p, void *end)
|
|
{
|
|
static const unsigned char bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
|
|
static const size_t count = ARRAY_SIZE(bits);
|
|
|
|
if (count > 0) {
|
|
size_t i;
|
|
size_t size = ((size_t)bits[count - 1] + 64) / 64 * 8;
|
|
|
|
BUG_ON(*p + 4 + size > end);
|
|
ceph_encode_32(p, size);
|
|
memset(*p, 0, size);
|
|
for (i = 0; i < count; i++)
|
|
((unsigned char*)(*p))[i / 8] |= 1 << (bits[i] % 8);
|
|
*p += size;
|
|
} else {
|
|
BUG_ON(*p + 4 > end);
|
|
ceph_encode_32(p, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* session message, specialization for CEPH_SESSION_REQUEST_OPEN
|
|
* to include additional client metadata fields.
|
|
*/
|
|
static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
|
|
{
|
|
struct ceph_msg *msg;
|
|
struct ceph_mds_session_head *h;
|
|
int i = -1;
|
|
int extra_bytes = 0;
|
|
int metadata_key_count = 0;
|
|
struct ceph_options *opt = mdsc->fsc->client->options;
|
|
struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
|
|
void *p, *end;
|
|
|
|
const char* metadata[][2] = {
|
|
{"hostname", mdsc->nodename},
|
|
{"kernel_version", init_utsname()->release},
|
|
{"entity_id", opt->name ? : ""},
|
|
{"root", fsopt->server_path ? : "/"},
|
|
{NULL, NULL}
|
|
};
|
|
|
|
/* Calculate serialized length of metadata */
|
|
extra_bytes = 4; /* map length */
|
|
for (i = 0; metadata[i][0]; ++i) {
|
|
extra_bytes += 8 + strlen(metadata[i][0]) +
|
|
strlen(metadata[i][1]);
|
|
metadata_key_count++;
|
|
}
|
|
/* supported feature */
|
|
extra_bytes += 4 + 8;
|
|
|
|
/* Allocate the message */
|
|
msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
|
|
GFP_NOFS, false);
|
|
if (!msg) {
|
|
pr_err("create_session_msg ENOMEM creating msg\n");
|
|
return NULL;
|
|
}
|
|
p = msg->front.iov_base;
|
|
end = p + msg->front.iov_len;
|
|
|
|
h = p;
|
|
h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
|
|
h->seq = cpu_to_le64(seq);
|
|
|
|
/*
|
|
* Serialize client metadata into waiting buffer space, using
|
|
* the format that userspace expects for map<string, string>
|
|
*
|
|
* ClientSession messages with metadata are v2
|
|
*/
|
|
msg->hdr.version = cpu_to_le16(3);
|
|
msg->hdr.compat_version = cpu_to_le16(1);
|
|
|
|
/* The write pointer, following the session_head structure */
|
|
p += sizeof(*h);
|
|
|
|
/* Number of entries in the map */
|
|
ceph_encode_32(&p, metadata_key_count);
|
|
|
|
/* Two length-prefixed strings for each entry in the map */
|
|
for (i = 0; metadata[i][0]; ++i) {
|
|
size_t const key_len = strlen(metadata[i][0]);
|
|
size_t const val_len = strlen(metadata[i][1]);
|
|
|
|
ceph_encode_32(&p, key_len);
|
|
memcpy(p, metadata[i][0], key_len);
|
|
p += key_len;
|
|
ceph_encode_32(&p, val_len);
|
|
memcpy(p, metadata[i][1], val_len);
|
|
p += val_len;
|
|
}
|
|
|
|
encode_supported_features(&p, end);
|
|
msg->front.iov_len = p - msg->front.iov_base;
|
|
msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
|
|
|
|
return msg;
|
|
}
|
|
|
|
/*
|
|
* send session open request.
|
|
*
|
|
* called under mdsc->mutex
|
|
*/
|
|
static int __open_session(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_msg *msg;
|
|
int mstate;
|
|
int mds = session->s_mds;
|
|
|
|
/* wait for mds to go active? */
|
|
mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
|
|
dout("open_session to mds%d (%s)\n", mds,
|
|
ceph_mds_state_name(mstate));
|
|
session->s_state = CEPH_MDS_SESSION_OPENING;
|
|
session->s_renew_requested = jiffies;
|
|
|
|
/* send connect message */
|
|
msg = create_session_open_msg(mdsc, session->s_seq);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
ceph_con_send(&session->s_con, msg);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* open sessions for any export targets for the given mds
|
|
*
|
|
* called under mdsc->mutex
|
|
*/
|
|
static struct ceph_mds_session *
|
|
__open_export_target_session(struct ceph_mds_client *mdsc, int target)
|
|
{
|
|
struct ceph_mds_session *session;
|
|
|
|
session = __ceph_lookup_mds_session(mdsc, target);
|
|
if (!session) {
|
|
session = register_session(mdsc, target);
|
|
if (IS_ERR(session))
|
|
return session;
|
|
}
|
|
if (session->s_state == CEPH_MDS_SESSION_NEW ||
|
|
session->s_state == CEPH_MDS_SESSION_CLOSING)
|
|
__open_session(mdsc, session);
|
|
|
|
return session;
|
|
}
|
|
|
|
struct ceph_mds_session *
|
|
ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
|
|
{
|
|
struct ceph_mds_session *session;
|
|
|
|
dout("open_export_target_session to mds%d\n", target);
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
session = __open_export_target_session(mdsc, target);
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
return session;
|
|
}
|
|
|
|
static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_mds_info *mi;
|
|
struct ceph_mds_session *ts;
|
|
int i, mds = session->s_mds;
|
|
|
|
if (mds >= mdsc->mdsmap->m_num_mds)
|
|
return;
|
|
|
|
mi = &mdsc->mdsmap->m_info[mds];
|
|
dout("open_export_target_sessions for mds%d (%d targets)\n",
|
|
session->s_mds, mi->num_export_targets);
|
|
|
|
for (i = 0; i < mi->num_export_targets; i++) {
|
|
ts = __open_export_target_session(mdsc, mi->export_targets[i]);
|
|
if (!IS_ERR(ts))
|
|
ceph_put_mds_session(ts);
|
|
}
|
|
}
|
|
|
|
void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
mutex_lock(&mdsc->mutex);
|
|
__open_export_target_sessions(mdsc, session);
|
|
mutex_unlock(&mdsc->mutex);
|
|
}
|
|
|
|
/*
|
|
* session caps
|
|
*/
|
|
|
|
static void detach_cap_releases(struct ceph_mds_session *session,
|
|
struct list_head *target)
|
|
{
|
|
lockdep_assert_held(&session->s_cap_lock);
|
|
|
|
list_splice_init(&session->s_cap_releases, target);
|
|
session->s_num_cap_releases = 0;
|
|
dout("dispose_cap_releases mds%d\n", session->s_mds);
|
|
}
|
|
|
|
static void dispose_cap_releases(struct ceph_mds_client *mdsc,
|
|
struct list_head *dispose)
|
|
{
|
|
while (!list_empty(dispose)) {
|
|
struct ceph_cap *cap;
|
|
/* zero out the in-progress message */
|
|
cap = list_first_entry(dispose, struct ceph_cap, session_caps);
|
|
list_del(&cap->session_caps);
|
|
ceph_put_cap(mdsc, cap);
|
|
}
|
|
}
|
|
|
|
static void cleanup_session_requests(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_mds_request *req;
|
|
struct rb_node *p;
|
|
|
|
dout("cleanup_session_requests mds%d\n", session->s_mds);
|
|
mutex_lock(&mdsc->mutex);
|
|
while (!list_empty(&session->s_unsafe)) {
|
|
req = list_first_entry(&session->s_unsafe,
|
|
struct ceph_mds_request, r_unsafe_item);
|
|
pr_warn_ratelimited(" dropping unsafe request %llu\n",
|
|
req->r_tid);
|
|
__unregister_request(mdsc, req);
|
|
}
|
|
/* zero r_attempts, so kick_requests() will re-send requests */
|
|
p = rb_first(&mdsc->request_tree);
|
|
while (p) {
|
|
req = rb_entry(p, struct ceph_mds_request, r_node);
|
|
p = rb_next(p);
|
|
if (req->r_session &&
|
|
req->r_session->s_mds == session->s_mds)
|
|
req->r_attempts = 0;
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
}
|
|
|
|
/*
|
|
* Helper to safely iterate over all caps associated with a session, with
|
|
* special care taken to handle a racing __ceph_remove_cap().
|
|
*
|
|
* Caller must hold session s_mutex.
|
|
*/
|
|
static int iterate_session_caps(struct ceph_mds_session *session,
|
|
int (*cb)(struct inode *, struct ceph_cap *,
|
|
void *), void *arg)
|
|
{
|
|
struct list_head *p;
|
|
struct ceph_cap *cap;
|
|
struct inode *inode, *last_inode = NULL;
|
|
struct ceph_cap *old_cap = NULL;
|
|
int ret;
|
|
|
|
dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
|
|
spin_lock(&session->s_cap_lock);
|
|
p = session->s_caps.next;
|
|
while (p != &session->s_caps) {
|
|
cap = list_entry(p, struct ceph_cap, session_caps);
|
|
inode = igrab(&cap->ci->vfs_inode);
|
|
if (!inode) {
|
|
p = p->next;
|
|
continue;
|
|
}
|
|
session->s_cap_iterator = cap;
|
|
spin_unlock(&session->s_cap_lock);
|
|
|
|
if (last_inode) {
|
|
iput(last_inode);
|
|
last_inode = NULL;
|
|
}
|
|
if (old_cap) {
|
|
ceph_put_cap(session->s_mdsc, old_cap);
|
|
old_cap = NULL;
|
|
}
|
|
|
|
ret = cb(inode, cap, arg);
|
|
last_inode = inode;
|
|
|
|
spin_lock(&session->s_cap_lock);
|
|
p = p->next;
|
|
if (!cap->ci) {
|
|
dout("iterate_session_caps finishing cap %p removal\n",
|
|
cap);
|
|
BUG_ON(cap->session != session);
|
|
cap->session = NULL;
|
|
list_del_init(&cap->session_caps);
|
|
session->s_nr_caps--;
|
|
if (cap->queue_release) {
|
|
list_add_tail(&cap->session_caps,
|
|
&session->s_cap_releases);
|
|
session->s_num_cap_releases++;
|
|
} else {
|
|
old_cap = cap; /* put_cap it w/o locks held */
|
|
}
|
|
}
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
ret = 0;
|
|
out:
|
|
session->s_cap_iterator = NULL;
|
|
spin_unlock(&session->s_cap_lock);
|
|
|
|
iput(last_inode);
|
|
if (old_cap)
|
|
ceph_put_cap(session->s_mdsc, old_cap);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
|
|
void *arg)
|
|
{
|
|
struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
LIST_HEAD(to_remove);
|
|
bool drop = false;
|
|
bool invalidate = false;
|
|
|
|
dout("removing cap %p, ci is %p, inode is %p\n",
|
|
cap, ci, &ci->vfs_inode);
|
|
spin_lock(&ci->i_ceph_lock);
|
|
__ceph_remove_cap(cap, false);
|
|
if (!ci->i_auth_cap) {
|
|
struct ceph_cap_flush *cf;
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
|
|
ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
|
|
|
|
if (ci->i_wrbuffer_ref > 0 &&
|
|
READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
|
|
invalidate = true;
|
|
|
|
while (!list_empty(&ci->i_cap_flush_list)) {
|
|
cf = list_first_entry(&ci->i_cap_flush_list,
|
|
struct ceph_cap_flush, i_list);
|
|
list_move(&cf->i_list, &to_remove);
|
|
}
|
|
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
|
|
list_for_each_entry(cf, &to_remove, i_list)
|
|
list_del(&cf->g_list);
|
|
|
|
if (!list_empty(&ci->i_dirty_item)) {
|
|
pr_warn_ratelimited(
|
|
" dropping dirty %s state for %p %lld\n",
|
|
ceph_cap_string(ci->i_dirty_caps),
|
|
inode, ceph_ino(inode));
|
|
ci->i_dirty_caps = 0;
|
|
list_del_init(&ci->i_dirty_item);
|
|
drop = true;
|
|
}
|
|
if (!list_empty(&ci->i_flushing_item)) {
|
|
pr_warn_ratelimited(
|
|
" dropping dirty+flushing %s state for %p %lld\n",
|
|
ceph_cap_string(ci->i_flushing_caps),
|
|
inode, ceph_ino(inode));
|
|
ci->i_flushing_caps = 0;
|
|
list_del_init(&ci->i_flushing_item);
|
|
mdsc->num_cap_flushing--;
|
|
drop = true;
|
|
}
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
|
|
if (atomic_read(&ci->i_filelock_ref) > 0) {
|
|
/* make further file lock syscall return -EIO */
|
|
ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK;
|
|
pr_warn_ratelimited(" dropping file locks for %p %lld\n",
|
|
inode, ceph_ino(inode));
|
|
}
|
|
|
|
if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
|
|
list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
|
|
ci->i_prealloc_cap_flush = NULL;
|
|
}
|
|
}
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
while (!list_empty(&to_remove)) {
|
|
struct ceph_cap_flush *cf;
|
|
cf = list_first_entry(&to_remove,
|
|
struct ceph_cap_flush, i_list);
|
|
list_del(&cf->i_list);
|
|
ceph_free_cap_flush(cf);
|
|
}
|
|
|
|
wake_up_all(&ci->i_cap_wq);
|
|
if (invalidate)
|
|
ceph_queue_invalidate(inode);
|
|
if (drop)
|
|
iput(inode);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* caller must hold session s_mutex
|
|
*/
|
|
static void remove_session_caps(struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_fs_client *fsc = session->s_mdsc->fsc;
|
|
struct super_block *sb = fsc->sb;
|
|
LIST_HEAD(dispose);
|
|
|
|
dout("remove_session_caps on %p\n", session);
|
|
iterate_session_caps(session, remove_session_caps_cb, fsc);
|
|
|
|
wake_up_all(&fsc->mdsc->cap_flushing_wq);
|
|
|
|
spin_lock(&session->s_cap_lock);
|
|
if (session->s_nr_caps > 0) {
|
|
struct inode *inode;
|
|
struct ceph_cap *cap, *prev = NULL;
|
|
struct ceph_vino vino;
|
|
/*
|
|
* iterate_session_caps() skips inodes that are being
|
|
* deleted, we need to wait until deletions are complete.
|
|
* __wait_on_freeing_inode() is designed for the job,
|
|
* but it is not exported, so use lookup inode function
|
|
* to access it.
|
|
*/
|
|
while (!list_empty(&session->s_caps)) {
|
|
cap = list_entry(session->s_caps.next,
|
|
struct ceph_cap, session_caps);
|
|
if (cap == prev)
|
|
break;
|
|
prev = cap;
|
|
vino = cap->ci->i_vino;
|
|
spin_unlock(&session->s_cap_lock);
|
|
|
|
inode = ceph_find_inode(sb, vino);
|
|
iput(inode);
|
|
|
|
spin_lock(&session->s_cap_lock);
|
|
}
|
|
}
|
|
|
|
// drop cap expires and unlock s_cap_lock
|
|
detach_cap_releases(session, &dispose);
|
|
|
|
BUG_ON(session->s_nr_caps > 0);
|
|
BUG_ON(!list_empty(&session->s_cap_flushing));
|
|
spin_unlock(&session->s_cap_lock);
|
|
dispose_cap_releases(session->s_mdsc, &dispose);
|
|
}
|
|
|
|
/*
|
|
* wake up any threads waiting on this session's caps. if the cap is
|
|
* old (didn't get renewed on the client reconnect), remove it now.
|
|
*
|
|
* caller must hold s_mutex.
|
|
*/
|
|
static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
|
|
void *arg)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
|
|
if (arg) {
|
|
spin_lock(&ci->i_ceph_lock);
|
|
ci->i_wanted_max_size = 0;
|
|
ci->i_requested_max_size = 0;
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
}
|
|
wake_up_all(&ci->i_cap_wq);
|
|
return 0;
|
|
}
|
|
|
|
static void wake_up_session_caps(struct ceph_mds_session *session,
|
|
int reconnect)
|
|
{
|
|
dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
|
|
iterate_session_caps(session, wake_up_session_cb,
|
|
(void *)(unsigned long)reconnect);
|
|
}
|
|
|
|
/*
|
|
* Send periodic message to MDS renewing all currently held caps. The
|
|
* ack will reset the expiration for all caps from this session.
|
|
*
|
|
* caller holds s_mutex
|
|
*/
|
|
static int send_renew_caps(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_msg *msg;
|
|
int state;
|
|
|
|
if (time_after_eq(jiffies, session->s_cap_ttl) &&
|
|
time_after_eq(session->s_cap_ttl, session->s_renew_requested))
|
|
pr_info("mds%d caps stale\n", session->s_mds);
|
|
session->s_renew_requested = jiffies;
|
|
|
|
/* do not try to renew caps until a recovering mds has reconnected
|
|
* with its clients. */
|
|
state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
|
|
if (state < CEPH_MDS_STATE_RECONNECT) {
|
|
dout("send_renew_caps ignoring mds%d (%s)\n",
|
|
session->s_mds, ceph_mds_state_name(state));
|
|
return 0;
|
|
}
|
|
|
|
dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
|
|
ceph_mds_state_name(state));
|
|
msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
|
|
++session->s_renew_seq);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
ceph_con_send(&session->s_con, msg);
|
|
return 0;
|
|
}
|
|
|
|
static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session, u64 seq)
|
|
{
|
|
struct ceph_msg *msg;
|
|
|
|
dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
|
|
session->s_mds, ceph_session_state_name(session->s_state), seq);
|
|
msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
ceph_con_send(&session->s_con, msg);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Note new cap ttl, and any transition from stale -> not stale (fresh?).
|
|
*
|
|
* Called under session->s_mutex
|
|
*/
|
|
static void renewed_caps(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session, int is_renew)
|
|
{
|
|
int was_stale;
|
|
int wake = 0;
|
|
|
|
spin_lock(&session->s_cap_lock);
|
|
was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
|
|
|
|
session->s_cap_ttl = session->s_renew_requested +
|
|
mdsc->mdsmap->m_session_timeout*HZ;
|
|
|
|
if (was_stale) {
|
|
if (time_before(jiffies, session->s_cap_ttl)) {
|
|
pr_info("mds%d caps renewed\n", session->s_mds);
|
|
wake = 1;
|
|
} else {
|
|
pr_info("mds%d caps still stale\n", session->s_mds);
|
|
}
|
|
}
|
|
dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
|
|
session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
|
|
time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
|
|
spin_unlock(&session->s_cap_lock);
|
|
|
|
if (wake)
|
|
wake_up_session_caps(session, 0);
|
|
}
|
|
|
|
/*
|
|
* send a session close request
|
|
*/
|
|
static int request_close_session(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_msg *msg;
|
|
|
|
dout("request_close_session mds%d state %s seq %lld\n",
|
|
session->s_mds, ceph_session_state_name(session->s_state),
|
|
session->s_seq);
|
|
msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
ceph_con_send(&session->s_con, msg);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Called with s_mutex held.
|
|
*/
|
|
static int __close_session(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
|
|
return 0;
|
|
session->s_state = CEPH_MDS_SESSION_CLOSING;
|
|
return request_close_session(mdsc, session);
|
|
}
|
|
|
|
static bool drop_negative_children(struct dentry *dentry)
|
|
{
|
|
struct dentry *child;
|
|
bool all_negative = true;
|
|
|
|
if (!d_is_dir(dentry))
|
|
goto out;
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
list_for_each_entry(child, &dentry->d_subdirs, d_child) {
|
|
if (d_really_is_positive(child)) {
|
|
all_negative = false;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
if (all_negative)
|
|
shrink_dcache_parent(dentry);
|
|
out:
|
|
return all_negative;
|
|
}
|
|
|
|
/*
|
|
* Trim old(er) caps.
|
|
*
|
|
* Because we can't cache an inode without one or more caps, we do
|
|
* this indirectly: if a cap is unused, we prune its aliases, at which
|
|
* point the inode will hopefully get dropped to.
|
|
*
|
|
* Yes, this is a bit sloppy. Our only real goal here is to respond to
|
|
* memory pressure from the MDS, though, so it needn't be perfect.
|
|
*/
|
|
static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
|
|
{
|
|
struct ceph_mds_session *session = arg;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int used, wanted, oissued, mine;
|
|
|
|
if (session->s_trim_caps <= 0)
|
|
return -1;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
mine = cap->issued | cap->implemented;
|
|
used = __ceph_caps_used(ci);
|
|
wanted = __ceph_caps_file_wanted(ci);
|
|
oissued = __ceph_caps_issued_other(ci, cap);
|
|
|
|
dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
|
|
inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
|
|
ceph_cap_string(used), ceph_cap_string(wanted));
|
|
if (cap == ci->i_auth_cap) {
|
|
if (ci->i_dirty_caps || ci->i_flushing_caps ||
|
|
!list_empty(&ci->i_cap_snaps))
|
|
goto out;
|
|
if ((used | wanted) & CEPH_CAP_ANY_WR)
|
|
goto out;
|
|
/* Note: it's possible that i_filelock_ref becomes non-zero
|
|
* after dropping auth caps. It doesn't hurt because reply
|
|
* of lock mds request will re-add auth caps. */
|
|
if (atomic_read(&ci->i_filelock_ref) > 0)
|
|
goto out;
|
|
}
|
|
/* The inode has cached pages, but it's no longer used.
|
|
* we can safely drop it */
|
|
if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
|
|
!(oissued & CEPH_CAP_FILE_CACHE)) {
|
|
used = 0;
|
|
oissued = 0;
|
|
}
|
|
if ((used | wanted) & ~oissued & mine)
|
|
goto out; /* we need these caps */
|
|
|
|
if (oissued) {
|
|
/* we aren't the only cap.. just remove us */
|
|
__ceph_remove_cap(cap, true);
|
|
session->s_trim_caps--;
|
|
} else {
|
|
struct dentry *dentry;
|
|
/* try dropping referring dentries */
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
dentry = d_find_any_alias(inode);
|
|
if (dentry && drop_negative_children(dentry)) {
|
|
int count;
|
|
dput(dentry);
|
|
d_prune_aliases(inode);
|
|
count = atomic_read(&inode->i_count);
|
|
if (count == 1)
|
|
session->s_trim_caps--;
|
|
dout("trim_caps_cb %p cap %p pruned, count now %d\n",
|
|
inode, cap, count);
|
|
} else {
|
|
dput(dentry);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Trim session cap count down to some max number.
|
|
*/
|
|
int ceph_trim_caps(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session,
|
|
int max_caps)
|
|
{
|
|
int trim_caps = session->s_nr_caps - max_caps;
|
|
|
|
dout("trim_caps mds%d start: %d / %d, trim %d\n",
|
|
session->s_mds, session->s_nr_caps, max_caps, trim_caps);
|
|
if (trim_caps > 0) {
|
|
session->s_trim_caps = trim_caps;
|
|
iterate_session_caps(session, trim_caps_cb, session);
|
|
dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
|
|
session->s_mds, session->s_nr_caps, max_caps,
|
|
trim_caps - session->s_trim_caps);
|
|
session->s_trim_caps = 0;
|
|
}
|
|
|
|
ceph_send_cap_releases(mdsc, session);
|
|
return 0;
|
|
}
|
|
|
|
static int check_caps_flush(struct ceph_mds_client *mdsc,
|
|
u64 want_flush_tid)
|
|
{
|
|
int ret = 1;
|
|
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
if (!list_empty(&mdsc->cap_flush_list)) {
|
|
struct ceph_cap_flush *cf =
|
|
list_first_entry(&mdsc->cap_flush_list,
|
|
struct ceph_cap_flush, g_list);
|
|
if (cf->tid <= want_flush_tid) {
|
|
dout("check_caps_flush still flushing tid "
|
|
"%llu <= %llu\n", cf->tid, want_flush_tid);
|
|
ret = 0;
|
|
}
|
|
}
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* flush all dirty inode data to disk.
|
|
*
|
|
* returns true if we've flushed through want_flush_tid
|
|
*/
|
|
static void wait_caps_flush(struct ceph_mds_client *mdsc,
|
|
u64 want_flush_tid)
|
|
{
|
|
dout("check_caps_flush want %llu\n", want_flush_tid);
|
|
|
|
wait_event(mdsc->cap_flushing_wq,
|
|
check_caps_flush(mdsc, want_flush_tid));
|
|
|
|
dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
|
|
}
|
|
|
|
/*
|
|
* called under s_mutex
|
|
*/
|
|
void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_msg *msg = NULL;
|
|
struct ceph_mds_cap_release *head;
|
|
struct ceph_mds_cap_item *item;
|
|
struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
|
|
struct ceph_cap *cap;
|
|
LIST_HEAD(tmp_list);
|
|
int num_cap_releases;
|
|
__le32 barrier, *cap_barrier;
|
|
|
|
down_read(&osdc->lock);
|
|
barrier = cpu_to_le32(osdc->epoch_barrier);
|
|
up_read(&osdc->lock);
|
|
|
|
spin_lock(&session->s_cap_lock);
|
|
again:
|
|
list_splice_init(&session->s_cap_releases, &tmp_list);
|
|
num_cap_releases = session->s_num_cap_releases;
|
|
session->s_num_cap_releases = 0;
|
|
spin_unlock(&session->s_cap_lock);
|
|
|
|
while (!list_empty(&tmp_list)) {
|
|
if (!msg) {
|
|
msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
|
|
PAGE_SIZE, GFP_NOFS, false);
|
|
if (!msg)
|
|
goto out_err;
|
|
head = msg->front.iov_base;
|
|
head->num = cpu_to_le32(0);
|
|
msg->front.iov_len = sizeof(*head);
|
|
|
|
msg->hdr.version = cpu_to_le16(2);
|
|
msg->hdr.compat_version = cpu_to_le16(1);
|
|
}
|
|
|
|
cap = list_first_entry(&tmp_list, struct ceph_cap,
|
|
session_caps);
|
|
list_del(&cap->session_caps);
|
|
num_cap_releases--;
|
|
|
|
head = msg->front.iov_base;
|
|
le32_add_cpu(&head->num, 1);
|
|
item = msg->front.iov_base + msg->front.iov_len;
|
|
item->ino = cpu_to_le64(cap->cap_ino);
|
|
item->cap_id = cpu_to_le64(cap->cap_id);
|
|
item->migrate_seq = cpu_to_le32(cap->mseq);
|
|
item->seq = cpu_to_le32(cap->issue_seq);
|
|
msg->front.iov_len += sizeof(*item);
|
|
|
|
ceph_put_cap(mdsc, cap);
|
|
|
|
if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
|
|
// Append cap_barrier field
|
|
cap_barrier = msg->front.iov_base + msg->front.iov_len;
|
|
*cap_barrier = barrier;
|
|
msg->front.iov_len += sizeof(*cap_barrier);
|
|
|
|
msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
|
|
dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
|
|
ceph_con_send(&session->s_con, msg);
|
|
msg = NULL;
|
|
}
|
|
}
|
|
|
|
BUG_ON(num_cap_releases != 0);
|
|
|
|
spin_lock(&session->s_cap_lock);
|
|
if (!list_empty(&session->s_cap_releases))
|
|
goto again;
|
|
spin_unlock(&session->s_cap_lock);
|
|
|
|
if (msg) {
|
|
// Append cap_barrier field
|
|
cap_barrier = msg->front.iov_base + msg->front.iov_len;
|
|
*cap_barrier = barrier;
|
|
msg->front.iov_len += sizeof(*cap_barrier);
|
|
|
|
msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
|
|
dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
|
|
ceph_con_send(&session->s_con, msg);
|
|
}
|
|
return;
|
|
out_err:
|
|
pr_err("send_cap_releases mds%d, failed to allocate message\n",
|
|
session->s_mds);
|
|
spin_lock(&session->s_cap_lock);
|
|
list_splice(&tmp_list, &session->s_cap_releases);
|
|
session->s_num_cap_releases += num_cap_releases;
|
|
spin_unlock(&session->s_cap_lock);
|
|
}
|
|
|
|
/*
|
|
* requests
|
|
*/
|
|
|
|
int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
|
|
struct inode *dir)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(dir);
|
|
struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
|
|
struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
|
|
size_t size = sizeof(struct ceph_mds_reply_dir_entry);
|
|
int order, num_entries;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
num_entries = ci->i_files + ci->i_subdirs;
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
num_entries = max(num_entries, 1);
|
|
num_entries = min(num_entries, opt->max_readdir);
|
|
|
|
order = get_order(size * num_entries);
|
|
while (order >= 0) {
|
|
rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
|
|
__GFP_NOWARN,
|
|
order);
|
|
if (rinfo->dir_entries)
|
|
break;
|
|
order--;
|
|
}
|
|
if (!rinfo->dir_entries)
|
|
return -ENOMEM;
|
|
|
|
num_entries = (PAGE_SIZE << order) / size;
|
|
num_entries = min(num_entries, opt->max_readdir);
|
|
|
|
rinfo->dir_buf_size = PAGE_SIZE << order;
|
|
req->r_num_caps = num_entries + 1;
|
|
req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
|
|
req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Create an mds request.
|
|
*/
|
|
struct ceph_mds_request *
|
|
ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
|
|
{
|
|
struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
|
|
struct timespec64 ts;
|
|
|
|
if (!req)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
mutex_init(&req->r_fill_mutex);
|
|
req->r_mdsc = mdsc;
|
|
req->r_started = jiffies;
|
|
req->r_resend_mds = -1;
|
|
INIT_LIST_HEAD(&req->r_unsafe_dir_item);
|
|
INIT_LIST_HEAD(&req->r_unsafe_target_item);
|
|
req->r_fmode = -1;
|
|
kref_init(&req->r_kref);
|
|
RB_CLEAR_NODE(&req->r_node);
|
|
INIT_LIST_HEAD(&req->r_wait);
|
|
init_completion(&req->r_completion);
|
|
init_completion(&req->r_safe_completion);
|
|
INIT_LIST_HEAD(&req->r_unsafe_item);
|
|
|
|
ktime_get_coarse_real_ts64(&ts);
|
|
req->r_stamp = timespec64_trunc(ts, mdsc->fsc->sb->s_time_gran);
|
|
|
|
req->r_op = op;
|
|
req->r_direct_mode = mode;
|
|
return req;
|
|
}
|
|
|
|
/*
|
|
* return oldest (lowest) request, tid in request tree, 0 if none.
|
|
*
|
|
* called under mdsc->mutex.
|
|
*/
|
|
static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
|
|
{
|
|
if (RB_EMPTY_ROOT(&mdsc->request_tree))
|
|
return NULL;
|
|
return rb_entry(rb_first(&mdsc->request_tree),
|
|
struct ceph_mds_request, r_node);
|
|
}
|
|
|
|
static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
|
|
{
|
|
return mdsc->oldest_tid;
|
|
}
|
|
|
|
/*
|
|
* Build a dentry's path. Allocate on heap; caller must kfree. Based
|
|
* on build_path_from_dentry in fs/cifs/dir.c.
|
|
*
|
|
* If @stop_on_nosnap, generate path relative to the first non-snapped
|
|
* inode.
|
|
*
|
|
* Encode hidden .snap dirs as a double /, i.e.
|
|
* foo/.snap/bar -> foo//bar
|
|
*/
|
|
char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
|
|
int stop_on_nosnap)
|
|
{
|
|
struct dentry *temp;
|
|
char *path;
|
|
int len, pos;
|
|
unsigned seq;
|
|
|
|
if (!dentry)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
retry:
|
|
len = 0;
|
|
seq = read_seqbegin(&rename_lock);
|
|
rcu_read_lock();
|
|
for (temp = dentry; !IS_ROOT(temp);) {
|
|
struct inode *inode = d_inode(temp);
|
|
if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
|
|
len++; /* slash only */
|
|
else if (stop_on_nosnap && inode &&
|
|
ceph_snap(inode) == CEPH_NOSNAP)
|
|
break;
|
|
else
|
|
len += 1 + temp->d_name.len;
|
|
temp = temp->d_parent;
|
|
}
|
|
rcu_read_unlock();
|
|
if (len)
|
|
len--; /* no leading '/' */
|
|
|
|
path = kmalloc(len+1, GFP_NOFS);
|
|
if (!path)
|
|
return ERR_PTR(-ENOMEM);
|
|
pos = len;
|
|
path[pos] = 0; /* trailing null */
|
|
rcu_read_lock();
|
|
for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
|
|
struct inode *inode;
|
|
|
|
spin_lock(&temp->d_lock);
|
|
inode = d_inode(temp);
|
|
if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
|
|
dout("build_path path+%d: %p SNAPDIR\n",
|
|
pos, temp);
|
|
} else if (stop_on_nosnap && inode &&
|
|
ceph_snap(inode) == CEPH_NOSNAP) {
|
|
spin_unlock(&temp->d_lock);
|
|
break;
|
|
} else {
|
|
pos -= temp->d_name.len;
|
|
if (pos < 0) {
|
|
spin_unlock(&temp->d_lock);
|
|
break;
|
|
}
|
|
strncpy(path + pos, temp->d_name.name,
|
|
temp->d_name.len);
|
|
}
|
|
spin_unlock(&temp->d_lock);
|
|
if (pos)
|
|
path[--pos] = '/';
|
|
temp = temp->d_parent;
|
|
}
|
|
rcu_read_unlock();
|
|
if (pos != 0 || read_seqretry(&rename_lock, seq)) {
|
|
pr_err("build_path did not end path lookup where "
|
|
"expected, namelen is %d, pos is %d\n", len, pos);
|
|
/* presumably this is only possible if racing with a
|
|
rename of one of the parent directories (we can not
|
|
lock the dentries above us to prevent this, but
|
|
retrying should be harmless) */
|
|
kfree(path);
|
|
goto retry;
|
|
}
|
|
|
|
*base = ceph_ino(d_inode(temp));
|
|
*plen = len;
|
|
dout("build_path on %p %d built %llx '%.*s'\n",
|
|
dentry, d_count(dentry), *base, len, path);
|
|
return path;
|
|
}
|
|
|
|
static int build_dentry_path(struct dentry *dentry, struct inode *dir,
|
|
const char **ppath, int *ppathlen, u64 *pino,
|
|
int *pfreepath)
|
|
{
|
|
char *path;
|
|
|
|
rcu_read_lock();
|
|
if (!dir)
|
|
dir = d_inode_rcu(dentry->d_parent);
|
|
if (dir && ceph_snap(dir) == CEPH_NOSNAP) {
|
|
*pino = ceph_ino(dir);
|
|
rcu_read_unlock();
|
|
*ppath = dentry->d_name.name;
|
|
*ppathlen = dentry->d_name.len;
|
|
return 0;
|
|
}
|
|
rcu_read_unlock();
|
|
path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
|
|
if (IS_ERR(path))
|
|
return PTR_ERR(path);
|
|
*ppath = path;
|
|
*pfreepath = 1;
|
|
return 0;
|
|
}
|
|
|
|
static int build_inode_path(struct inode *inode,
|
|
const char **ppath, int *ppathlen, u64 *pino,
|
|
int *pfreepath)
|
|
{
|
|
struct dentry *dentry;
|
|
char *path;
|
|
|
|
if (ceph_snap(inode) == CEPH_NOSNAP) {
|
|
*pino = ceph_ino(inode);
|
|
*ppathlen = 0;
|
|
return 0;
|
|
}
|
|
dentry = d_find_alias(inode);
|
|
path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
|
|
dput(dentry);
|
|
if (IS_ERR(path))
|
|
return PTR_ERR(path);
|
|
*ppath = path;
|
|
*pfreepath = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* request arguments may be specified via an inode *, a dentry *, or
|
|
* an explicit ino+path.
|
|
*/
|
|
static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
|
|
struct inode *rdiri, const char *rpath,
|
|
u64 rino, const char **ppath, int *pathlen,
|
|
u64 *ino, int *freepath)
|
|
{
|
|
int r = 0;
|
|
|
|
if (rinode) {
|
|
r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
|
|
dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
|
|
ceph_snap(rinode));
|
|
} else if (rdentry) {
|
|
r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
|
|
freepath);
|
|
dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
|
|
*ppath);
|
|
} else if (rpath || rino) {
|
|
*ino = rino;
|
|
*ppath = rpath;
|
|
*pathlen = rpath ? strlen(rpath) : 0;
|
|
dout(" path %.*s\n", *pathlen, rpath);
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* called under mdsc->mutex
|
|
*/
|
|
static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_request *req,
|
|
int mds, bool drop_cap_releases)
|
|
{
|
|
struct ceph_msg *msg;
|
|
struct ceph_mds_request_head *head;
|
|
const char *path1 = NULL;
|
|
const char *path2 = NULL;
|
|
u64 ino1 = 0, ino2 = 0;
|
|
int pathlen1 = 0, pathlen2 = 0;
|
|
int freepath1 = 0, freepath2 = 0;
|
|
int len;
|
|
u16 releases;
|
|
void *p, *end;
|
|
int ret;
|
|
|
|
ret = set_request_path_attr(req->r_inode, req->r_dentry,
|
|
req->r_parent, req->r_path1, req->r_ino1.ino,
|
|
&path1, &pathlen1, &ino1, &freepath1);
|
|
if (ret < 0) {
|
|
msg = ERR_PTR(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = set_request_path_attr(NULL, req->r_old_dentry,
|
|
req->r_old_dentry_dir,
|
|
req->r_path2, req->r_ino2.ino,
|
|
&path2, &pathlen2, &ino2, &freepath2);
|
|
if (ret < 0) {
|
|
msg = ERR_PTR(ret);
|
|
goto out_free1;
|
|
}
|
|
|
|
len = sizeof(*head) +
|
|
pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
|
|
sizeof(struct ceph_timespec);
|
|
|
|
/* calculate (max) length for cap releases */
|
|
len += sizeof(struct ceph_mds_request_release) *
|
|
(!!req->r_inode_drop + !!req->r_dentry_drop +
|
|
!!req->r_old_inode_drop + !!req->r_old_dentry_drop);
|
|
if (req->r_dentry_drop)
|
|
len += req->r_dentry->d_name.len;
|
|
if (req->r_old_dentry_drop)
|
|
len += req->r_old_dentry->d_name.len;
|
|
|
|
msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
|
|
if (!msg) {
|
|
msg = ERR_PTR(-ENOMEM);
|
|
goto out_free2;
|
|
}
|
|
|
|
msg->hdr.version = cpu_to_le16(2);
|
|
msg->hdr.tid = cpu_to_le64(req->r_tid);
|
|
|
|
head = msg->front.iov_base;
|
|
p = msg->front.iov_base + sizeof(*head);
|
|
end = msg->front.iov_base + msg->front.iov_len;
|
|
|
|
head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
|
|
head->op = cpu_to_le32(req->r_op);
|
|
head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
|
|
head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
|
|
head->args = req->r_args;
|
|
|
|
ceph_encode_filepath(&p, end, ino1, path1);
|
|
ceph_encode_filepath(&p, end, ino2, path2);
|
|
|
|
/* make note of release offset, in case we need to replay */
|
|
req->r_request_release_offset = p - msg->front.iov_base;
|
|
|
|
/* cap releases */
|
|
releases = 0;
|
|
if (req->r_inode_drop)
|
|
releases += ceph_encode_inode_release(&p,
|
|
req->r_inode ? req->r_inode : d_inode(req->r_dentry),
|
|
mds, req->r_inode_drop, req->r_inode_unless, 0);
|
|
if (req->r_dentry_drop)
|
|
releases += ceph_encode_dentry_release(&p, req->r_dentry,
|
|
req->r_parent, mds, req->r_dentry_drop,
|
|
req->r_dentry_unless);
|
|
if (req->r_old_dentry_drop)
|
|
releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
|
|
req->r_old_dentry_dir, mds,
|
|
req->r_old_dentry_drop,
|
|
req->r_old_dentry_unless);
|
|
if (req->r_old_inode_drop)
|
|
releases += ceph_encode_inode_release(&p,
|
|
d_inode(req->r_old_dentry),
|
|
mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
|
|
|
|
if (drop_cap_releases) {
|
|
releases = 0;
|
|
p = msg->front.iov_base + req->r_request_release_offset;
|
|
}
|
|
|
|
head->num_releases = cpu_to_le16(releases);
|
|
|
|
/* time stamp */
|
|
{
|
|
struct ceph_timespec ts;
|
|
ceph_encode_timespec64(&ts, &req->r_stamp);
|
|
ceph_encode_copy(&p, &ts, sizeof(ts));
|
|
}
|
|
|
|
BUG_ON(p > end);
|
|
msg->front.iov_len = p - msg->front.iov_base;
|
|
msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
|
|
|
|
if (req->r_pagelist) {
|
|
struct ceph_pagelist *pagelist = req->r_pagelist;
|
|
ceph_msg_data_add_pagelist(msg, pagelist);
|
|
msg->hdr.data_len = cpu_to_le32(pagelist->length);
|
|
} else {
|
|
msg->hdr.data_len = 0;
|
|
}
|
|
|
|
msg->hdr.data_off = cpu_to_le16(0);
|
|
|
|
out_free2:
|
|
if (freepath2)
|
|
kfree((char *)path2);
|
|
out_free1:
|
|
if (freepath1)
|
|
kfree((char *)path1);
|
|
out:
|
|
return msg;
|
|
}
|
|
|
|
/*
|
|
* called under mdsc->mutex if error, under no mutex if
|
|
* success.
|
|
*/
|
|
static void complete_request(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_request *req)
|
|
{
|
|
if (req->r_callback)
|
|
req->r_callback(mdsc, req);
|
|
else
|
|
complete_all(&req->r_completion);
|
|
}
|
|
|
|
/*
|
|
* called under mdsc->mutex
|
|
*/
|
|
static int __prepare_send_request(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_request *req,
|
|
int mds, bool drop_cap_releases)
|
|
{
|
|
struct ceph_mds_request_head *rhead;
|
|
struct ceph_msg *msg;
|
|
int flags = 0;
|
|
|
|
req->r_attempts++;
|
|
if (req->r_inode) {
|
|
struct ceph_cap *cap =
|
|
ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
|
|
|
|
if (cap)
|
|
req->r_sent_on_mseq = cap->mseq;
|
|
else
|
|
req->r_sent_on_mseq = -1;
|
|
}
|
|
dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
|
|
req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
|
|
|
|
if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
|
|
void *p;
|
|
/*
|
|
* Replay. Do not regenerate message (and rebuild
|
|
* paths, etc.); just use the original message.
|
|
* Rebuilding paths will break for renames because
|
|
* d_move mangles the src name.
|
|
*/
|
|
msg = req->r_request;
|
|
rhead = msg->front.iov_base;
|
|
|
|
flags = le32_to_cpu(rhead->flags);
|
|
flags |= CEPH_MDS_FLAG_REPLAY;
|
|
rhead->flags = cpu_to_le32(flags);
|
|
|
|
if (req->r_target_inode)
|
|
rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
|
|
|
|
rhead->num_retry = req->r_attempts - 1;
|
|
|
|
/* remove cap/dentry releases from message */
|
|
rhead->num_releases = 0;
|
|
|
|
/* time stamp */
|
|
p = msg->front.iov_base + req->r_request_release_offset;
|
|
{
|
|
struct ceph_timespec ts;
|
|
ceph_encode_timespec64(&ts, &req->r_stamp);
|
|
ceph_encode_copy(&p, &ts, sizeof(ts));
|
|
}
|
|
|
|
msg->front.iov_len = p - msg->front.iov_base;
|
|
msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
|
|
return 0;
|
|
}
|
|
|
|
if (req->r_request) {
|
|
ceph_msg_put(req->r_request);
|
|
req->r_request = NULL;
|
|
}
|
|
msg = create_request_message(mdsc, req, mds, drop_cap_releases);
|
|
if (IS_ERR(msg)) {
|
|
req->r_err = PTR_ERR(msg);
|
|
return PTR_ERR(msg);
|
|
}
|
|
req->r_request = msg;
|
|
|
|
rhead = msg->front.iov_base;
|
|
rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
|
|
if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
|
|
flags |= CEPH_MDS_FLAG_REPLAY;
|
|
if (req->r_parent)
|
|
flags |= CEPH_MDS_FLAG_WANT_DENTRY;
|
|
rhead->flags = cpu_to_le32(flags);
|
|
rhead->num_fwd = req->r_num_fwd;
|
|
rhead->num_retry = req->r_attempts - 1;
|
|
rhead->ino = 0;
|
|
|
|
dout(" r_parent = %p\n", req->r_parent);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* send request, or put it on the appropriate wait list.
|
|
*/
|
|
static void __do_request(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_request *req)
|
|
{
|
|
struct ceph_mds_session *session = NULL;
|
|
int mds = -1;
|
|
int err = 0;
|
|
|
|
if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
|
|
if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
|
|
__unregister_request(mdsc, req);
|
|
return;
|
|
}
|
|
|
|
if (req->r_timeout &&
|
|
time_after_eq(jiffies, req->r_started + req->r_timeout)) {
|
|
dout("do_request timed out\n");
|
|
err = -EIO;
|
|
goto finish;
|
|
}
|
|
if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
|
|
dout("do_request forced umount\n");
|
|
err = -EIO;
|
|
goto finish;
|
|
}
|
|
if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
|
|
if (mdsc->mdsmap_err) {
|
|
err = mdsc->mdsmap_err;
|
|
dout("do_request mdsmap err %d\n", err);
|
|
goto finish;
|
|
}
|
|
if (mdsc->mdsmap->m_epoch == 0) {
|
|
dout("do_request no mdsmap, waiting for map\n");
|
|
list_add(&req->r_wait, &mdsc->waiting_for_map);
|
|
return;
|
|
}
|
|
if (!(mdsc->fsc->mount_options->flags &
|
|
CEPH_MOUNT_OPT_MOUNTWAIT) &&
|
|
!ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
|
|
err = -ENOENT;
|
|
pr_info("probably no mds server is up\n");
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
put_request_session(req);
|
|
|
|
mds = __choose_mds(mdsc, req);
|
|
if (mds < 0 ||
|
|
ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
|
|
dout("do_request no mds or not active, waiting for map\n");
|
|
list_add(&req->r_wait, &mdsc->waiting_for_map);
|
|
return;
|
|
}
|
|
|
|
/* get, open session */
|
|
session = __ceph_lookup_mds_session(mdsc, mds);
|
|
if (!session) {
|
|
session = register_session(mdsc, mds);
|
|
if (IS_ERR(session)) {
|
|
err = PTR_ERR(session);
|
|
goto finish;
|
|
}
|
|
}
|
|
req->r_session = get_session(session);
|
|
|
|
dout("do_request mds%d session %p state %s\n", mds, session,
|
|
ceph_session_state_name(session->s_state));
|
|
if (session->s_state != CEPH_MDS_SESSION_OPEN &&
|
|
session->s_state != CEPH_MDS_SESSION_HUNG) {
|
|
if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
|
|
err = -EACCES;
|
|
goto out_session;
|
|
}
|
|
if (session->s_state == CEPH_MDS_SESSION_NEW ||
|
|
session->s_state == CEPH_MDS_SESSION_CLOSING)
|
|
__open_session(mdsc, session);
|
|
list_add(&req->r_wait, &session->s_waiting);
|
|
goto out_session;
|
|
}
|
|
|
|
/* send request */
|
|
req->r_resend_mds = -1; /* forget any previous mds hint */
|
|
|
|
if (req->r_request_started == 0) /* note request start time */
|
|
req->r_request_started = jiffies;
|
|
|
|
err = __prepare_send_request(mdsc, req, mds, false);
|
|
if (!err) {
|
|
ceph_msg_get(req->r_request);
|
|
ceph_con_send(&session->s_con, req->r_request);
|
|
}
|
|
|
|
out_session:
|
|
ceph_put_mds_session(session);
|
|
finish:
|
|
if (err) {
|
|
dout("__do_request early error %d\n", err);
|
|
req->r_err = err;
|
|
complete_request(mdsc, req);
|
|
__unregister_request(mdsc, req);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* called under mdsc->mutex
|
|
*/
|
|
static void __wake_requests(struct ceph_mds_client *mdsc,
|
|
struct list_head *head)
|
|
{
|
|
struct ceph_mds_request *req;
|
|
LIST_HEAD(tmp_list);
|
|
|
|
list_splice_init(head, &tmp_list);
|
|
|
|
while (!list_empty(&tmp_list)) {
|
|
req = list_entry(tmp_list.next,
|
|
struct ceph_mds_request, r_wait);
|
|
list_del_init(&req->r_wait);
|
|
dout(" wake request %p tid %llu\n", req, req->r_tid);
|
|
__do_request(mdsc, req);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Wake up threads with requests pending for @mds, so that they can
|
|
* resubmit their requests to a possibly different mds.
|
|
*/
|
|
static void kick_requests(struct ceph_mds_client *mdsc, int mds)
|
|
{
|
|
struct ceph_mds_request *req;
|
|
struct rb_node *p = rb_first(&mdsc->request_tree);
|
|
|
|
dout("kick_requests mds%d\n", mds);
|
|
while (p) {
|
|
req = rb_entry(p, struct ceph_mds_request, r_node);
|
|
p = rb_next(p);
|
|
if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
|
|
continue;
|
|
if (req->r_attempts > 0)
|
|
continue; /* only new requests */
|
|
if (req->r_session &&
|
|
req->r_session->s_mds == mds) {
|
|
dout(" kicking tid %llu\n", req->r_tid);
|
|
list_del_init(&req->r_wait);
|
|
__do_request(mdsc, req);
|
|
}
|
|
}
|
|
}
|
|
|
|
void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_request *req)
|
|
{
|
|
dout("submit_request on %p\n", req);
|
|
mutex_lock(&mdsc->mutex);
|
|
__register_request(mdsc, req, NULL);
|
|
__do_request(mdsc, req);
|
|
mutex_unlock(&mdsc->mutex);
|
|
}
|
|
|
|
/*
|
|
* Synchrously perform an mds request. Take care of all of the
|
|
* session setup, forwarding, retry details.
|
|
*/
|
|
int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
|
|
struct inode *dir,
|
|
struct ceph_mds_request *req)
|
|
{
|
|
int err;
|
|
|
|
dout("do_request on %p\n", req);
|
|
|
|
/* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
|
|
if (req->r_inode)
|
|
ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
|
|
if (req->r_parent)
|
|
ceph_get_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
|
|
if (req->r_old_dentry_dir)
|
|
ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
|
|
CEPH_CAP_PIN);
|
|
|
|
/* issue */
|
|
mutex_lock(&mdsc->mutex);
|
|
__register_request(mdsc, req, dir);
|
|
__do_request(mdsc, req);
|
|
|
|
if (req->r_err) {
|
|
err = req->r_err;
|
|
goto out;
|
|
}
|
|
|
|
/* wait */
|
|
mutex_unlock(&mdsc->mutex);
|
|
dout("do_request waiting\n");
|
|
if (!req->r_timeout && req->r_wait_for_completion) {
|
|
err = req->r_wait_for_completion(mdsc, req);
|
|
} else {
|
|
long timeleft = wait_for_completion_killable_timeout(
|
|
&req->r_completion,
|
|
ceph_timeout_jiffies(req->r_timeout));
|
|
if (timeleft > 0)
|
|
err = 0;
|
|
else if (!timeleft)
|
|
err = -EIO; /* timed out */
|
|
else
|
|
err = timeleft; /* killed */
|
|
}
|
|
dout("do_request waited, got %d\n", err);
|
|
mutex_lock(&mdsc->mutex);
|
|
|
|
/* only abort if we didn't race with a real reply */
|
|
if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
|
|
err = le32_to_cpu(req->r_reply_info.head->result);
|
|
} else if (err < 0) {
|
|
dout("aborted request %lld with %d\n", req->r_tid, err);
|
|
|
|
/*
|
|
* ensure we aren't running concurrently with
|
|
* ceph_fill_trace or ceph_readdir_prepopulate, which
|
|
* rely on locks (dir mutex) held by our caller.
|
|
*/
|
|
mutex_lock(&req->r_fill_mutex);
|
|
req->r_err = err;
|
|
set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
|
|
mutex_unlock(&req->r_fill_mutex);
|
|
|
|
if (req->r_parent &&
|
|
(req->r_op & CEPH_MDS_OP_WRITE))
|
|
ceph_invalidate_dir_request(req);
|
|
} else {
|
|
err = req->r_err;
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&mdsc->mutex);
|
|
dout("do_request %p done, result %d\n", req, err);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Invalidate dir's completeness, dentry lease state on an aborted MDS
|
|
* namespace request.
|
|
*/
|
|
void ceph_invalidate_dir_request(struct ceph_mds_request *req)
|
|
{
|
|
struct inode *dir = req->r_parent;
|
|
struct inode *old_dir = req->r_old_dentry_dir;
|
|
|
|
dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir);
|
|
|
|
ceph_dir_clear_complete(dir);
|
|
if (old_dir)
|
|
ceph_dir_clear_complete(old_dir);
|
|
if (req->r_dentry)
|
|
ceph_invalidate_dentry_lease(req->r_dentry);
|
|
if (req->r_old_dentry)
|
|
ceph_invalidate_dentry_lease(req->r_old_dentry);
|
|
}
|
|
|
|
/*
|
|
* Handle mds reply.
|
|
*
|
|
* We take the session mutex and parse and process the reply immediately.
|
|
* This preserves the logical ordering of replies, capabilities, etc., sent
|
|
* by the MDS as they are applied to our local cache.
|
|
*/
|
|
static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
|
|
{
|
|
struct ceph_mds_client *mdsc = session->s_mdsc;
|
|
struct ceph_mds_request *req;
|
|
struct ceph_mds_reply_head *head = msg->front.iov_base;
|
|
struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
|
|
struct ceph_snap_realm *realm;
|
|
u64 tid;
|
|
int err, result;
|
|
int mds = session->s_mds;
|
|
|
|
if (msg->front.iov_len < sizeof(*head)) {
|
|
pr_err("mdsc_handle_reply got corrupt (short) reply\n");
|
|
ceph_msg_dump(msg);
|
|
return;
|
|
}
|
|
|
|
/* get request, session */
|
|
tid = le64_to_cpu(msg->hdr.tid);
|
|
mutex_lock(&mdsc->mutex);
|
|
req = lookup_get_request(mdsc, tid);
|
|
if (!req) {
|
|
dout("handle_reply on unknown tid %llu\n", tid);
|
|
mutex_unlock(&mdsc->mutex);
|
|
return;
|
|
}
|
|
dout("handle_reply %p\n", req);
|
|
|
|
/* correct session? */
|
|
if (req->r_session != session) {
|
|
pr_err("mdsc_handle_reply got %llu on session mds%d"
|
|
" not mds%d\n", tid, session->s_mds,
|
|
req->r_session ? req->r_session->s_mds : -1);
|
|
mutex_unlock(&mdsc->mutex);
|
|
goto out;
|
|
}
|
|
|
|
/* dup? */
|
|
if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
|
|
(test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
|
|
pr_warn("got a dup %s reply on %llu from mds%d\n",
|
|
head->safe ? "safe" : "unsafe", tid, mds);
|
|
mutex_unlock(&mdsc->mutex);
|
|
goto out;
|
|
}
|
|
if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
|
|
pr_warn("got unsafe after safe on %llu from mds%d\n",
|
|
tid, mds);
|
|
mutex_unlock(&mdsc->mutex);
|
|
goto out;
|
|
}
|
|
|
|
result = le32_to_cpu(head->result);
|
|
|
|
/*
|
|
* Handle an ESTALE
|
|
* if we're not talking to the authority, send to them
|
|
* if the authority has changed while we weren't looking,
|
|
* send to new authority
|
|
* Otherwise we just have to return an ESTALE
|
|
*/
|
|
if (result == -ESTALE) {
|
|
dout("got ESTALE on request %llu\n", req->r_tid);
|
|
req->r_resend_mds = -1;
|
|
if (req->r_direct_mode != USE_AUTH_MDS) {
|
|
dout("not using auth, setting for that now\n");
|
|
req->r_direct_mode = USE_AUTH_MDS;
|
|
__do_request(mdsc, req);
|
|
mutex_unlock(&mdsc->mutex);
|
|
goto out;
|
|
} else {
|
|
int mds = __choose_mds(mdsc, req);
|
|
if (mds >= 0 && mds != req->r_session->s_mds) {
|
|
dout("but auth changed, so resending\n");
|
|
__do_request(mdsc, req);
|
|
mutex_unlock(&mdsc->mutex);
|
|
goto out;
|
|
}
|
|
}
|
|
dout("have to return ESTALE on request %llu\n", req->r_tid);
|
|
}
|
|
|
|
|
|
if (head->safe) {
|
|
set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
|
|
__unregister_request(mdsc, req);
|
|
|
|
if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
|
|
/*
|
|
* We already handled the unsafe response, now do the
|
|
* cleanup. No need to examine the response; the MDS
|
|
* doesn't include any result info in the safe
|
|
* response. And even if it did, there is nothing
|
|
* useful we could do with a revised return value.
|
|
*/
|
|
dout("got safe reply %llu, mds%d\n", tid, mds);
|
|
|
|
/* last unsafe request during umount? */
|
|
if (mdsc->stopping && !__get_oldest_req(mdsc))
|
|
complete_all(&mdsc->safe_umount_waiters);
|
|
mutex_unlock(&mdsc->mutex);
|
|
goto out;
|
|
}
|
|
} else {
|
|
set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
|
|
list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
|
|
if (req->r_unsafe_dir) {
|
|
struct ceph_inode_info *ci =
|
|
ceph_inode(req->r_unsafe_dir);
|
|
spin_lock(&ci->i_unsafe_lock);
|
|
list_add_tail(&req->r_unsafe_dir_item,
|
|
&ci->i_unsafe_dirops);
|
|
spin_unlock(&ci->i_unsafe_lock);
|
|
}
|
|
}
|
|
|
|
dout("handle_reply tid %lld result %d\n", tid, result);
|
|
rinfo = &req->r_reply_info;
|
|
err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
mutex_lock(&session->s_mutex);
|
|
if (err < 0) {
|
|
pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
|
|
ceph_msg_dump(msg);
|
|
goto out_err;
|
|
}
|
|
|
|
/* snap trace */
|
|
realm = NULL;
|
|
if (rinfo->snapblob_len) {
|
|
down_write(&mdsc->snap_rwsem);
|
|
ceph_update_snap_trace(mdsc, rinfo->snapblob,
|
|
rinfo->snapblob + rinfo->snapblob_len,
|
|
le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
|
|
&realm);
|
|
downgrade_write(&mdsc->snap_rwsem);
|
|
} else {
|
|
down_read(&mdsc->snap_rwsem);
|
|
}
|
|
|
|
/* insert trace into our cache */
|
|
mutex_lock(&req->r_fill_mutex);
|
|
current->journal_info = req;
|
|
err = ceph_fill_trace(mdsc->fsc->sb, req);
|
|
if (err == 0) {
|
|
if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
|
|
req->r_op == CEPH_MDS_OP_LSSNAP))
|
|
ceph_readdir_prepopulate(req, req->r_session);
|
|
ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
|
|
}
|
|
current->journal_info = NULL;
|
|
mutex_unlock(&req->r_fill_mutex);
|
|
|
|
up_read(&mdsc->snap_rwsem);
|
|
if (realm)
|
|
ceph_put_snap_realm(mdsc, realm);
|
|
|
|
if (err == 0 && req->r_target_inode &&
|
|
test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
|
|
struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
|
|
spin_lock(&ci->i_unsafe_lock);
|
|
list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
|
|
spin_unlock(&ci->i_unsafe_lock);
|
|
}
|
|
out_err:
|
|
mutex_lock(&mdsc->mutex);
|
|
if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
|
|
if (err) {
|
|
req->r_err = err;
|
|
} else {
|
|
req->r_reply = ceph_msg_get(msg);
|
|
set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
|
|
}
|
|
} else {
|
|
dout("reply arrived after request %lld was aborted\n", tid);
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
mutex_unlock(&session->s_mutex);
|
|
|
|
/* kick calling process */
|
|
complete_request(mdsc, req);
|
|
out:
|
|
ceph_mdsc_put_request(req);
|
|
return;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* handle mds notification that our request has been forwarded.
|
|
*/
|
|
static void handle_forward(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session,
|
|
struct ceph_msg *msg)
|
|
{
|
|
struct ceph_mds_request *req;
|
|
u64 tid = le64_to_cpu(msg->hdr.tid);
|
|
u32 next_mds;
|
|
u32 fwd_seq;
|
|
int err = -EINVAL;
|
|
void *p = msg->front.iov_base;
|
|
void *end = p + msg->front.iov_len;
|
|
|
|
ceph_decode_need(&p, end, 2*sizeof(u32), bad);
|
|
next_mds = ceph_decode_32(&p);
|
|
fwd_seq = ceph_decode_32(&p);
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
req = lookup_get_request(mdsc, tid);
|
|
if (!req) {
|
|
dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
|
|
goto out; /* dup reply? */
|
|
}
|
|
|
|
if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
|
|
dout("forward tid %llu aborted, unregistering\n", tid);
|
|
__unregister_request(mdsc, req);
|
|
} else if (fwd_seq <= req->r_num_fwd) {
|
|
dout("forward tid %llu to mds%d - old seq %d <= %d\n",
|
|
tid, next_mds, req->r_num_fwd, fwd_seq);
|
|
} else {
|
|
/* resend. forward race not possible; mds would drop */
|
|
dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
|
|
BUG_ON(req->r_err);
|
|
BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
|
|
req->r_attempts = 0;
|
|
req->r_num_fwd = fwd_seq;
|
|
req->r_resend_mds = next_mds;
|
|
put_request_session(req);
|
|
__do_request(mdsc, req);
|
|
}
|
|
ceph_mdsc_put_request(req);
|
|
out:
|
|
mutex_unlock(&mdsc->mutex);
|
|
return;
|
|
|
|
bad:
|
|
pr_err("mdsc_handle_forward decode error err=%d\n", err);
|
|
}
|
|
|
|
/*
|
|
* handle a mds session control message
|
|
*/
|
|
static void handle_session(struct ceph_mds_session *session,
|
|
struct ceph_msg *msg)
|
|
{
|
|
struct ceph_mds_client *mdsc = session->s_mdsc;
|
|
u32 op;
|
|
u64 seq;
|
|
int mds = session->s_mds;
|
|
struct ceph_mds_session_head *h = msg->front.iov_base;
|
|
int wake = 0;
|
|
|
|
/* decode */
|
|
if (msg->front.iov_len < sizeof(*h))
|
|
goto bad;
|
|
op = le32_to_cpu(h->op);
|
|
seq = le64_to_cpu(h->seq);
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
if (op == CEPH_SESSION_CLOSE) {
|
|
get_session(session);
|
|
__unregister_session(mdsc, session);
|
|
}
|
|
/* FIXME: this ttl calculation is generous */
|
|
session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
mutex_lock(&session->s_mutex);
|
|
|
|
dout("handle_session mds%d %s %p state %s seq %llu\n",
|
|
mds, ceph_session_op_name(op), session,
|
|
ceph_session_state_name(session->s_state), seq);
|
|
|
|
if (session->s_state == CEPH_MDS_SESSION_HUNG) {
|
|
session->s_state = CEPH_MDS_SESSION_OPEN;
|
|
pr_info("mds%d came back\n", session->s_mds);
|
|
}
|
|
|
|
switch (op) {
|
|
case CEPH_SESSION_OPEN:
|
|
if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
|
|
pr_info("mds%d reconnect success\n", session->s_mds);
|
|
session->s_state = CEPH_MDS_SESSION_OPEN;
|
|
renewed_caps(mdsc, session, 0);
|
|
wake = 1;
|
|
if (mdsc->stopping)
|
|
__close_session(mdsc, session);
|
|
break;
|
|
|
|
case CEPH_SESSION_RENEWCAPS:
|
|
if (session->s_renew_seq == seq)
|
|
renewed_caps(mdsc, session, 1);
|
|
break;
|
|
|
|
case CEPH_SESSION_CLOSE:
|
|
if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
|
|
pr_info("mds%d reconnect denied\n", session->s_mds);
|
|
cleanup_session_requests(mdsc, session);
|
|
remove_session_caps(session);
|
|
wake = 2; /* for good measure */
|
|
wake_up_all(&mdsc->session_close_wq);
|
|
break;
|
|
|
|
case CEPH_SESSION_STALE:
|
|
pr_info("mds%d caps went stale, renewing\n",
|
|
session->s_mds);
|
|
spin_lock(&session->s_gen_ttl_lock);
|
|
session->s_cap_gen++;
|
|
session->s_cap_ttl = jiffies - 1;
|
|
spin_unlock(&session->s_gen_ttl_lock);
|
|
send_renew_caps(mdsc, session);
|
|
break;
|
|
|
|
case CEPH_SESSION_RECALL_STATE:
|
|
ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
|
|
break;
|
|
|
|
case CEPH_SESSION_FLUSHMSG:
|
|
send_flushmsg_ack(mdsc, session, seq);
|
|
break;
|
|
|
|
case CEPH_SESSION_FORCE_RO:
|
|
dout("force_session_readonly %p\n", session);
|
|
spin_lock(&session->s_cap_lock);
|
|
session->s_readonly = true;
|
|
spin_unlock(&session->s_cap_lock);
|
|
wake_up_session_caps(session, 0);
|
|
break;
|
|
|
|
case CEPH_SESSION_REJECT:
|
|
WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
|
|
pr_info("mds%d rejected session\n", session->s_mds);
|
|
session->s_state = CEPH_MDS_SESSION_REJECTED;
|
|
cleanup_session_requests(mdsc, session);
|
|
remove_session_caps(session);
|
|
wake = 2; /* for good measure */
|
|
break;
|
|
|
|
default:
|
|
pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
|
|
WARN_ON(1);
|
|
}
|
|
|
|
mutex_unlock(&session->s_mutex);
|
|
if (wake) {
|
|
mutex_lock(&mdsc->mutex);
|
|
__wake_requests(mdsc, &session->s_waiting);
|
|
if (wake == 2)
|
|
kick_requests(mdsc, mds);
|
|
mutex_unlock(&mdsc->mutex);
|
|
}
|
|
if (op == CEPH_SESSION_CLOSE)
|
|
ceph_put_mds_session(session);
|
|
return;
|
|
|
|
bad:
|
|
pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
|
|
(int)msg->front.iov_len);
|
|
ceph_msg_dump(msg);
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* called under session->mutex.
|
|
*/
|
|
static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_mds_request *req, *nreq;
|
|
struct rb_node *p;
|
|
int err;
|
|
|
|
dout("replay_unsafe_requests mds%d\n", session->s_mds);
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
|
|
err = __prepare_send_request(mdsc, req, session->s_mds, true);
|
|
if (!err) {
|
|
ceph_msg_get(req->r_request);
|
|
ceph_con_send(&session->s_con, req->r_request);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* also re-send old requests when MDS enters reconnect stage. So that MDS
|
|
* can process completed request in clientreplay stage.
|
|
*/
|
|
p = rb_first(&mdsc->request_tree);
|
|
while (p) {
|
|
req = rb_entry(p, struct ceph_mds_request, r_node);
|
|
p = rb_next(p);
|
|
if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
|
|
continue;
|
|
if (req->r_attempts == 0)
|
|
continue; /* only old requests */
|
|
if (req->r_session &&
|
|
req->r_session->s_mds == session->s_mds) {
|
|
err = __prepare_send_request(mdsc, req,
|
|
session->s_mds, true);
|
|
if (!err) {
|
|
ceph_msg_get(req->r_request);
|
|
ceph_con_send(&session->s_con, req->r_request);
|
|
}
|
|
}
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
}
|
|
|
|
/*
|
|
* Encode information about a cap for a reconnect with the MDS.
|
|
*/
|
|
static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
|
|
void *arg)
|
|
{
|
|
union {
|
|
struct ceph_mds_cap_reconnect v2;
|
|
struct ceph_mds_cap_reconnect_v1 v1;
|
|
} rec;
|
|
struct ceph_inode_info *ci = cap->ci;
|
|
struct ceph_reconnect_state *recon_state = arg;
|
|
struct ceph_pagelist *pagelist = recon_state->pagelist;
|
|
char *path;
|
|
int pathlen, err;
|
|
u64 pathbase;
|
|
u64 snap_follows;
|
|
struct dentry *dentry;
|
|
|
|
dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
|
|
inode, ceph_vinop(inode), cap, cap->cap_id,
|
|
ceph_cap_string(cap->issued));
|
|
err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
|
|
if (err)
|
|
return err;
|
|
|
|
dentry = d_find_alias(inode);
|
|
if (dentry) {
|
|
path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
|
|
if (IS_ERR(path)) {
|
|
err = PTR_ERR(path);
|
|
goto out_dput;
|
|
}
|
|
} else {
|
|
path = NULL;
|
|
pathlen = 0;
|
|
pathbase = 0;
|
|
}
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
cap->seq = 0; /* reset cap seq */
|
|
cap->issue_seq = 0; /* and issue_seq */
|
|
cap->mseq = 0; /* and migrate_seq */
|
|
cap->cap_gen = cap->session->s_cap_gen;
|
|
|
|
if (recon_state->msg_version >= 2) {
|
|
rec.v2.cap_id = cpu_to_le64(cap->cap_id);
|
|
rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
|
|
rec.v2.issued = cpu_to_le32(cap->issued);
|
|
rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
|
|
rec.v2.pathbase = cpu_to_le64(pathbase);
|
|
rec.v2.flock_len = (__force __le32)
|
|
((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
|
|
} else {
|
|
rec.v1.cap_id = cpu_to_le64(cap->cap_id);
|
|
rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
|
|
rec.v1.issued = cpu_to_le32(cap->issued);
|
|
rec.v1.size = cpu_to_le64(inode->i_size);
|
|
ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime);
|
|
ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime);
|
|
rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
|
|
rec.v1.pathbase = cpu_to_le64(pathbase);
|
|
}
|
|
|
|
if (list_empty(&ci->i_cap_snaps)) {
|
|
snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
|
|
} else {
|
|
struct ceph_cap_snap *capsnap =
|
|
list_first_entry(&ci->i_cap_snaps,
|
|
struct ceph_cap_snap, ci_item);
|
|
snap_follows = capsnap->follows;
|
|
}
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
if (recon_state->msg_version >= 2) {
|
|
int num_fcntl_locks, num_flock_locks;
|
|
struct ceph_filelock *flocks = NULL;
|
|
size_t struct_len, total_len = 0;
|
|
u8 struct_v = 0;
|
|
|
|
encode_again:
|
|
if (rec.v2.flock_len) {
|
|
ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
|
|
} else {
|
|
num_fcntl_locks = 0;
|
|
num_flock_locks = 0;
|
|
}
|
|
if (num_fcntl_locks + num_flock_locks > 0) {
|
|
flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
|
|
sizeof(struct ceph_filelock),
|
|
GFP_NOFS);
|
|
if (!flocks) {
|
|
err = -ENOMEM;
|
|
goto out_free;
|
|
}
|
|
err = ceph_encode_locks_to_buffer(inode, flocks,
|
|
num_fcntl_locks,
|
|
num_flock_locks);
|
|
if (err) {
|
|
kfree(flocks);
|
|
flocks = NULL;
|
|
if (err == -ENOSPC)
|
|
goto encode_again;
|
|
goto out_free;
|
|
}
|
|
} else {
|
|
kfree(flocks);
|
|
flocks = NULL;
|
|
}
|
|
|
|
if (recon_state->msg_version >= 3) {
|
|
/* version, compat_version and struct_len */
|
|
total_len = 2 * sizeof(u8) + sizeof(u32);
|
|
struct_v = 2;
|
|
}
|
|
/*
|
|
* number of encoded locks is stable, so copy to pagelist
|
|
*/
|
|
struct_len = 2 * sizeof(u32) +
|
|
(num_fcntl_locks + num_flock_locks) *
|
|
sizeof(struct ceph_filelock);
|
|
rec.v2.flock_len = cpu_to_le32(struct_len);
|
|
|
|
struct_len += sizeof(rec.v2);
|
|
struct_len += sizeof(u32) + pathlen;
|
|
|
|
if (struct_v >= 2)
|
|
struct_len += sizeof(u64); /* snap_follows */
|
|
|
|
total_len += struct_len;
|
|
err = ceph_pagelist_reserve(pagelist, total_len);
|
|
|
|
if (!err) {
|
|
if (recon_state->msg_version >= 3) {
|
|
ceph_pagelist_encode_8(pagelist, struct_v);
|
|
ceph_pagelist_encode_8(pagelist, 1);
|
|
ceph_pagelist_encode_32(pagelist, struct_len);
|
|
}
|
|
ceph_pagelist_encode_string(pagelist, path, pathlen);
|
|
ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
|
|
ceph_locks_to_pagelist(flocks, pagelist,
|
|
num_fcntl_locks,
|
|
num_flock_locks);
|
|
if (struct_v >= 2)
|
|
ceph_pagelist_encode_64(pagelist, snap_follows);
|
|
}
|
|
kfree(flocks);
|
|
} else {
|
|
size_t size = sizeof(u32) + pathlen + sizeof(rec.v1);
|
|
err = ceph_pagelist_reserve(pagelist, size);
|
|
if (!err) {
|
|
ceph_pagelist_encode_string(pagelist, path, pathlen);
|
|
ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
|
|
}
|
|
}
|
|
|
|
recon_state->nr_caps++;
|
|
out_free:
|
|
kfree(path);
|
|
out_dput:
|
|
dput(dentry);
|
|
return err;
|
|
}
|
|
|
|
|
|
/*
|
|
* If an MDS fails and recovers, clients need to reconnect in order to
|
|
* reestablish shared state. This includes all caps issued through
|
|
* this session _and_ the snap_realm hierarchy. Because it's not
|
|
* clear which snap realms the mds cares about, we send everything we
|
|
* know about.. that ensures we'll then get any new info the
|
|
* recovering MDS might have.
|
|
*
|
|
* This is a relatively heavyweight operation, but it's rare.
|
|
*
|
|
* called with mdsc->mutex held.
|
|
*/
|
|
static void send_mds_reconnect(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_msg *reply;
|
|
struct rb_node *p;
|
|
int mds = session->s_mds;
|
|
int err = -ENOMEM;
|
|
int s_nr_caps;
|
|
struct ceph_pagelist *pagelist;
|
|
struct ceph_reconnect_state recon_state;
|
|
LIST_HEAD(dispose);
|
|
|
|
pr_info("mds%d reconnect start\n", mds);
|
|
|
|
pagelist = ceph_pagelist_alloc(GFP_NOFS);
|
|
if (!pagelist)
|
|
goto fail_nopagelist;
|
|
|
|
reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
|
|
if (!reply)
|
|
goto fail_nomsg;
|
|
|
|
mutex_lock(&session->s_mutex);
|
|
session->s_state = CEPH_MDS_SESSION_RECONNECTING;
|
|
session->s_seq = 0;
|
|
|
|
dout("session %p state %s\n", session,
|
|
ceph_session_state_name(session->s_state));
|
|
|
|
spin_lock(&session->s_gen_ttl_lock);
|
|
session->s_cap_gen++;
|
|
spin_unlock(&session->s_gen_ttl_lock);
|
|
|
|
spin_lock(&session->s_cap_lock);
|
|
/* don't know if session is readonly */
|
|
session->s_readonly = 0;
|
|
/*
|
|
* notify __ceph_remove_cap() that we are composing cap reconnect.
|
|
* If a cap get released before being added to the cap reconnect,
|
|
* __ceph_remove_cap() should skip queuing cap release.
|
|
*/
|
|
session->s_cap_reconnect = 1;
|
|
/* drop old cap expires; we're about to reestablish that state */
|
|
detach_cap_releases(session, &dispose);
|
|
spin_unlock(&session->s_cap_lock);
|
|
dispose_cap_releases(mdsc, &dispose);
|
|
|
|
/* trim unused caps to reduce MDS's cache rejoin time */
|
|
if (mdsc->fsc->sb->s_root)
|
|
shrink_dcache_parent(mdsc->fsc->sb->s_root);
|
|
|
|
ceph_con_close(&session->s_con);
|
|
ceph_con_open(&session->s_con,
|
|
CEPH_ENTITY_TYPE_MDS, mds,
|
|
ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
|
|
|
|
/* replay unsafe requests */
|
|
replay_unsafe_requests(mdsc, session);
|
|
|
|
down_read(&mdsc->snap_rwsem);
|
|
|
|
/* traverse this session's caps */
|
|
s_nr_caps = session->s_nr_caps;
|
|
err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
|
|
if (err)
|
|
goto fail;
|
|
|
|
recon_state.nr_caps = 0;
|
|
recon_state.pagelist = pagelist;
|
|
if (session->s_con.peer_features & CEPH_FEATURE_MDSENC)
|
|
recon_state.msg_version = 3;
|
|
else
|
|
recon_state.msg_version = 2;
|
|
err = iterate_session_caps(session, encode_caps_cb, &recon_state);
|
|
if (err < 0)
|
|
goto fail;
|
|
|
|
spin_lock(&session->s_cap_lock);
|
|
session->s_cap_reconnect = 0;
|
|
spin_unlock(&session->s_cap_lock);
|
|
|
|
/*
|
|
* snaprealms. we provide mds with the ino, seq (version), and
|
|
* parent for all of our realms. If the mds has any newer info,
|
|
* it will tell us.
|
|
*/
|
|
for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
|
|
struct ceph_snap_realm *realm =
|
|
rb_entry(p, struct ceph_snap_realm, node);
|
|
struct ceph_mds_snaprealm_reconnect sr_rec;
|
|
|
|
dout(" adding snap realm %llx seq %lld parent %llx\n",
|
|
realm->ino, realm->seq, realm->parent_ino);
|
|
sr_rec.ino = cpu_to_le64(realm->ino);
|
|
sr_rec.seq = cpu_to_le64(realm->seq);
|
|
sr_rec.parent = cpu_to_le64(realm->parent_ino);
|
|
err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
|
|
if (err)
|
|
goto fail;
|
|
}
|
|
|
|
reply->hdr.version = cpu_to_le16(recon_state.msg_version);
|
|
|
|
/* raced with cap release? */
|
|
if (s_nr_caps != recon_state.nr_caps) {
|
|
struct page *page = list_first_entry(&pagelist->head,
|
|
struct page, lru);
|
|
__le32 *addr = kmap_atomic(page);
|
|
*addr = cpu_to_le32(recon_state.nr_caps);
|
|
kunmap_atomic(addr);
|
|
}
|
|
|
|
reply->hdr.data_len = cpu_to_le32(pagelist->length);
|
|
ceph_msg_data_add_pagelist(reply, pagelist);
|
|
|
|
ceph_early_kick_flushing_caps(mdsc, session);
|
|
|
|
ceph_con_send(&session->s_con, reply);
|
|
|
|
mutex_unlock(&session->s_mutex);
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
__wake_requests(mdsc, &session->s_waiting);
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
up_read(&mdsc->snap_rwsem);
|
|
ceph_pagelist_release(pagelist);
|
|
return;
|
|
|
|
fail:
|
|
ceph_msg_put(reply);
|
|
up_read(&mdsc->snap_rwsem);
|
|
mutex_unlock(&session->s_mutex);
|
|
fail_nomsg:
|
|
ceph_pagelist_release(pagelist);
|
|
fail_nopagelist:
|
|
pr_err("error %d preparing reconnect for mds%d\n", err, mds);
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* compare old and new mdsmaps, kicking requests
|
|
* and closing out old connections as necessary
|
|
*
|
|
* called under mdsc->mutex.
|
|
*/
|
|
static void check_new_map(struct ceph_mds_client *mdsc,
|
|
struct ceph_mdsmap *newmap,
|
|
struct ceph_mdsmap *oldmap)
|
|
{
|
|
int i;
|
|
int oldstate, newstate;
|
|
struct ceph_mds_session *s;
|
|
|
|
dout("check_new_map new %u old %u\n",
|
|
newmap->m_epoch, oldmap->m_epoch);
|
|
|
|
for (i = 0; i < oldmap->m_num_mds && i < mdsc->max_sessions; i++) {
|
|
if (!mdsc->sessions[i])
|
|
continue;
|
|
s = mdsc->sessions[i];
|
|
oldstate = ceph_mdsmap_get_state(oldmap, i);
|
|
newstate = ceph_mdsmap_get_state(newmap, i);
|
|
|
|
dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
|
|
i, ceph_mds_state_name(oldstate),
|
|
ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
|
|
ceph_mds_state_name(newstate),
|
|
ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
|
|
ceph_session_state_name(s->s_state));
|
|
|
|
if (i >= newmap->m_num_mds ||
|
|
memcmp(ceph_mdsmap_get_addr(oldmap, i),
|
|
ceph_mdsmap_get_addr(newmap, i),
|
|
sizeof(struct ceph_entity_addr))) {
|
|
if (s->s_state == CEPH_MDS_SESSION_OPENING) {
|
|
/* the session never opened, just close it
|
|
* out now */
|
|
get_session(s);
|
|
__unregister_session(mdsc, s);
|
|
__wake_requests(mdsc, &s->s_waiting);
|
|
ceph_put_mds_session(s);
|
|
} else if (i >= newmap->m_num_mds) {
|
|
/* force close session for stopped mds */
|
|
get_session(s);
|
|
__unregister_session(mdsc, s);
|
|
__wake_requests(mdsc, &s->s_waiting);
|
|
kick_requests(mdsc, i);
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
mutex_lock(&s->s_mutex);
|
|
cleanup_session_requests(mdsc, s);
|
|
remove_session_caps(s);
|
|
mutex_unlock(&s->s_mutex);
|
|
|
|
ceph_put_mds_session(s);
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
} else {
|
|
/* just close it */
|
|
mutex_unlock(&mdsc->mutex);
|
|
mutex_lock(&s->s_mutex);
|
|
mutex_lock(&mdsc->mutex);
|
|
ceph_con_close(&s->s_con);
|
|
mutex_unlock(&s->s_mutex);
|
|
s->s_state = CEPH_MDS_SESSION_RESTARTING;
|
|
}
|
|
} else if (oldstate == newstate) {
|
|
continue; /* nothing new with this mds */
|
|
}
|
|
|
|
/*
|
|
* send reconnect?
|
|
*/
|
|
if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
|
|
newstate >= CEPH_MDS_STATE_RECONNECT) {
|
|
mutex_unlock(&mdsc->mutex);
|
|
send_mds_reconnect(mdsc, s);
|
|
mutex_lock(&mdsc->mutex);
|
|
}
|
|
|
|
/*
|
|
* kick request on any mds that has gone active.
|
|
*/
|
|
if (oldstate < CEPH_MDS_STATE_ACTIVE &&
|
|
newstate >= CEPH_MDS_STATE_ACTIVE) {
|
|
if (oldstate != CEPH_MDS_STATE_CREATING &&
|
|
oldstate != CEPH_MDS_STATE_STARTING)
|
|
pr_info("mds%d recovery completed\n", s->s_mds);
|
|
kick_requests(mdsc, i);
|
|
ceph_kick_flushing_caps(mdsc, s);
|
|
wake_up_session_caps(s, 1);
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < newmap->m_num_mds && i < mdsc->max_sessions; i++) {
|
|
s = mdsc->sessions[i];
|
|
if (!s)
|
|
continue;
|
|
if (!ceph_mdsmap_is_laggy(newmap, i))
|
|
continue;
|
|
if (s->s_state == CEPH_MDS_SESSION_OPEN ||
|
|
s->s_state == CEPH_MDS_SESSION_HUNG ||
|
|
s->s_state == CEPH_MDS_SESSION_CLOSING) {
|
|
dout(" connecting to export targets of laggy mds%d\n",
|
|
i);
|
|
__open_export_target_sessions(mdsc, s);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* leases
|
|
*/
|
|
|
|
/*
|
|
* caller must hold session s_mutex, dentry->d_lock
|
|
*/
|
|
void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
|
|
{
|
|
struct ceph_dentry_info *di = ceph_dentry(dentry);
|
|
|
|
ceph_put_mds_session(di->lease_session);
|
|
di->lease_session = NULL;
|
|
}
|
|
|
|
static void handle_lease(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session,
|
|
struct ceph_msg *msg)
|
|
{
|
|
struct super_block *sb = mdsc->fsc->sb;
|
|
struct inode *inode;
|
|
struct dentry *parent, *dentry;
|
|
struct ceph_dentry_info *di;
|
|
int mds = session->s_mds;
|
|
struct ceph_mds_lease *h = msg->front.iov_base;
|
|
u32 seq;
|
|
struct ceph_vino vino;
|
|
struct qstr dname;
|
|
int release = 0;
|
|
|
|
dout("handle_lease from mds%d\n", mds);
|
|
|
|
/* decode */
|
|
if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
|
|
goto bad;
|
|
vino.ino = le64_to_cpu(h->ino);
|
|
vino.snap = CEPH_NOSNAP;
|
|
seq = le32_to_cpu(h->seq);
|
|
dname.len = get_unaligned_le32(h + 1);
|
|
if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
|
|
goto bad;
|
|
dname.name = (void *)(h + 1) + sizeof(u32);
|
|
|
|
/* lookup inode */
|
|
inode = ceph_find_inode(sb, vino);
|
|
dout("handle_lease %s, ino %llx %p %.*s\n",
|
|
ceph_lease_op_name(h->action), vino.ino, inode,
|
|
dname.len, dname.name);
|
|
|
|
mutex_lock(&session->s_mutex);
|
|
session->s_seq++;
|
|
|
|
if (!inode) {
|
|
dout("handle_lease no inode %llx\n", vino.ino);
|
|
goto release;
|
|
}
|
|
|
|
/* dentry */
|
|
parent = d_find_alias(inode);
|
|
if (!parent) {
|
|
dout("no parent dentry on inode %p\n", inode);
|
|
WARN_ON(1);
|
|
goto release; /* hrm... */
|
|
}
|
|
dname.hash = full_name_hash(parent, dname.name, dname.len);
|
|
dentry = d_lookup(parent, &dname);
|
|
dput(parent);
|
|
if (!dentry)
|
|
goto release;
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
di = ceph_dentry(dentry);
|
|
switch (h->action) {
|
|
case CEPH_MDS_LEASE_REVOKE:
|
|
if (di->lease_session == session) {
|
|
if (ceph_seq_cmp(di->lease_seq, seq) > 0)
|
|
h->seq = cpu_to_le32(di->lease_seq);
|
|
__ceph_mdsc_drop_dentry_lease(dentry);
|
|
}
|
|
release = 1;
|
|
break;
|
|
|
|
case CEPH_MDS_LEASE_RENEW:
|
|
if (di->lease_session == session &&
|
|
di->lease_gen == session->s_cap_gen &&
|
|
di->lease_renew_from &&
|
|
di->lease_renew_after == 0) {
|
|
unsigned long duration =
|
|
msecs_to_jiffies(le32_to_cpu(h->duration_ms));
|
|
|
|
di->lease_seq = seq;
|
|
di->time = di->lease_renew_from + duration;
|
|
di->lease_renew_after = di->lease_renew_from +
|
|
(duration >> 1);
|
|
di->lease_renew_from = 0;
|
|
}
|
|
break;
|
|
}
|
|
spin_unlock(&dentry->d_lock);
|
|
dput(dentry);
|
|
|
|
if (!release)
|
|
goto out;
|
|
|
|
release:
|
|
/* let's just reuse the same message */
|
|
h->action = CEPH_MDS_LEASE_REVOKE_ACK;
|
|
ceph_msg_get(msg);
|
|
ceph_con_send(&session->s_con, msg);
|
|
|
|
out:
|
|
iput(inode);
|
|
mutex_unlock(&session->s_mutex);
|
|
return;
|
|
|
|
bad:
|
|
pr_err("corrupt lease message\n");
|
|
ceph_msg_dump(msg);
|
|
}
|
|
|
|
void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
|
|
struct inode *inode,
|
|
struct dentry *dentry, char action,
|
|
u32 seq)
|
|
{
|
|
struct ceph_msg *msg;
|
|
struct ceph_mds_lease *lease;
|
|
int len = sizeof(*lease) + sizeof(u32);
|
|
int dnamelen = 0;
|
|
|
|
dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
|
|
inode, dentry, ceph_lease_op_name(action), session->s_mds);
|
|
dnamelen = dentry->d_name.len;
|
|
len += dnamelen;
|
|
|
|
msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
|
|
if (!msg)
|
|
return;
|
|
lease = msg->front.iov_base;
|
|
lease->action = action;
|
|
lease->ino = cpu_to_le64(ceph_vino(inode).ino);
|
|
lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
|
|
lease->seq = cpu_to_le32(seq);
|
|
put_unaligned_le32(dnamelen, lease + 1);
|
|
memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
|
|
|
|
/*
|
|
* if this is a preemptive lease RELEASE, no need to
|
|
* flush request stream, since the actual request will
|
|
* soon follow.
|
|
*/
|
|
msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
|
|
|
|
ceph_con_send(&session->s_con, msg);
|
|
}
|
|
|
|
/*
|
|
* lock unlock sessions, to wait ongoing session activities
|
|
*/
|
|
static void lock_unlock_sessions(struct ceph_mds_client *mdsc)
|
|
{
|
|
int i;
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
for (i = 0; i < mdsc->max_sessions; i++) {
|
|
struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
|
|
if (!s)
|
|
continue;
|
|
mutex_unlock(&mdsc->mutex);
|
|
mutex_lock(&s->s_mutex);
|
|
mutex_unlock(&s->s_mutex);
|
|
ceph_put_mds_session(s);
|
|
mutex_lock(&mdsc->mutex);
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* delayed work -- periodically trim expired leases, renew caps with mds
|
|
*/
|
|
static void schedule_delayed(struct ceph_mds_client *mdsc)
|
|
{
|
|
int delay = 5;
|
|
unsigned hz = round_jiffies_relative(HZ * delay);
|
|
schedule_delayed_work(&mdsc->delayed_work, hz);
|
|
}
|
|
|
|
static void delayed_work(struct work_struct *work)
|
|
{
|
|
int i;
|
|
struct ceph_mds_client *mdsc =
|
|
container_of(work, struct ceph_mds_client, delayed_work.work);
|
|
int renew_interval;
|
|
int renew_caps;
|
|
|
|
dout("mdsc delayed_work\n");
|
|
ceph_check_delayed_caps(mdsc);
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
|
|
renew_caps = time_after_eq(jiffies, HZ*renew_interval +
|
|
mdsc->last_renew_caps);
|
|
if (renew_caps)
|
|
mdsc->last_renew_caps = jiffies;
|
|
|
|
for (i = 0; i < mdsc->max_sessions; i++) {
|
|
struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
|
|
if (!s)
|
|
continue;
|
|
if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
|
|
dout("resending session close request for mds%d\n",
|
|
s->s_mds);
|
|
request_close_session(mdsc, s);
|
|
ceph_put_mds_session(s);
|
|
continue;
|
|
}
|
|
if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
|
|
if (s->s_state == CEPH_MDS_SESSION_OPEN) {
|
|
s->s_state = CEPH_MDS_SESSION_HUNG;
|
|
pr_info("mds%d hung\n", s->s_mds);
|
|
}
|
|
}
|
|
if (s->s_state < CEPH_MDS_SESSION_OPEN) {
|
|
/* this mds is failed or recovering, just wait */
|
|
ceph_put_mds_session(s);
|
|
continue;
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
mutex_lock(&s->s_mutex);
|
|
if (renew_caps)
|
|
send_renew_caps(mdsc, s);
|
|
else
|
|
ceph_con_keepalive(&s->s_con);
|
|
if (s->s_state == CEPH_MDS_SESSION_OPEN ||
|
|
s->s_state == CEPH_MDS_SESSION_HUNG)
|
|
ceph_send_cap_releases(mdsc, s);
|
|
mutex_unlock(&s->s_mutex);
|
|
ceph_put_mds_session(s);
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
schedule_delayed(mdsc);
|
|
}
|
|
|
|
int ceph_mdsc_init(struct ceph_fs_client *fsc)
|
|
|
|
{
|
|
struct ceph_mds_client *mdsc;
|
|
|
|
mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
|
|
if (!mdsc)
|
|
return -ENOMEM;
|
|
mdsc->fsc = fsc;
|
|
mutex_init(&mdsc->mutex);
|
|
mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
|
|
if (!mdsc->mdsmap) {
|
|
kfree(mdsc);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
fsc->mdsc = mdsc;
|
|
init_completion(&mdsc->safe_umount_waiters);
|
|
init_waitqueue_head(&mdsc->session_close_wq);
|
|
INIT_LIST_HEAD(&mdsc->waiting_for_map);
|
|
mdsc->sessions = NULL;
|
|
atomic_set(&mdsc->num_sessions, 0);
|
|
mdsc->max_sessions = 0;
|
|
mdsc->stopping = 0;
|
|
atomic64_set(&mdsc->quotarealms_count, 0);
|
|
mdsc->last_snap_seq = 0;
|
|
init_rwsem(&mdsc->snap_rwsem);
|
|
mdsc->snap_realms = RB_ROOT;
|
|
INIT_LIST_HEAD(&mdsc->snap_empty);
|
|
spin_lock_init(&mdsc->snap_empty_lock);
|
|
mdsc->last_tid = 0;
|
|
mdsc->oldest_tid = 0;
|
|
mdsc->request_tree = RB_ROOT;
|
|
INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
|
|
mdsc->last_renew_caps = jiffies;
|
|
INIT_LIST_HEAD(&mdsc->cap_delay_list);
|
|
spin_lock_init(&mdsc->cap_delay_lock);
|
|
INIT_LIST_HEAD(&mdsc->snap_flush_list);
|
|
spin_lock_init(&mdsc->snap_flush_lock);
|
|
mdsc->last_cap_flush_tid = 1;
|
|
INIT_LIST_HEAD(&mdsc->cap_flush_list);
|
|
INIT_LIST_HEAD(&mdsc->cap_dirty);
|
|
INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
|
|
mdsc->num_cap_flushing = 0;
|
|
spin_lock_init(&mdsc->cap_dirty_lock);
|
|
init_waitqueue_head(&mdsc->cap_flushing_wq);
|
|
spin_lock_init(&mdsc->dentry_lru_lock);
|
|
INIT_LIST_HEAD(&mdsc->dentry_lru);
|
|
|
|
ceph_caps_init(mdsc);
|
|
ceph_adjust_min_caps(mdsc, fsc->min_caps);
|
|
|
|
init_rwsem(&mdsc->pool_perm_rwsem);
|
|
mdsc->pool_perm_tree = RB_ROOT;
|
|
|
|
strscpy(mdsc->nodename, utsname()->nodename,
|
|
sizeof(mdsc->nodename));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Wait for safe replies on open mds requests. If we time out, drop
|
|
* all requests from the tree to avoid dangling dentry refs.
|
|
*/
|
|
static void wait_requests(struct ceph_mds_client *mdsc)
|
|
{
|
|
struct ceph_options *opts = mdsc->fsc->client->options;
|
|
struct ceph_mds_request *req;
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
if (__get_oldest_req(mdsc)) {
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
dout("wait_requests waiting for requests\n");
|
|
wait_for_completion_timeout(&mdsc->safe_umount_waiters,
|
|
ceph_timeout_jiffies(opts->mount_timeout));
|
|
|
|
/* tear down remaining requests */
|
|
mutex_lock(&mdsc->mutex);
|
|
while ((req = __get_oldest_req(mdsc))) {
|
|
dout("wait_requests timed out on tid %llu\n",
|
|
req->r_tid);
|
|
__unregister_request(mdsc, req);
|
|
}
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
dout("wait_requests done\n");
|
|
}
|
|
|
|
/*
|
|
* called before mount is ro, and before dentries are torn down.
|
|
* (hmm, does this still race with new lookups?)
|
|
*/
|
|
void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
|
|
{
|
|
dout("pre_umount\n");
|
|
mdsc->stopping = 1;
|
|
|
|
lock_unlock_sessions(mdsc);
|
|
ceph_flush_dirty_caps(mdsc);
|
|
wait_requests(mdsc);
|
|
|
|
/*
|
|
* wait for reply handlers to drop their request refs and
|
|
* their inode/dcache refs
|
|
*/
|
|
ceph_msgr_flush();
|
|
}
|
|
|
|
/*
|
|
* wait for all write mds requests to flush.
|
|
*/
|
|
static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
|
|
{
|
|
struct ceph_mds_request *req = NULL, *nextreq;
|
|
struct rb_node *n;
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
dout("wait_unsafe_requests want %lld\n", want_tid);
|
|
restart:
|
|
req = __get_oldest_req(mdsc);
|
|
while (req && req->r_tid <= want_tid) {
|
|
/* find next request */
|
|
n = rb_next(&req->r_node);
|
|
if (n)
|
|
nextreq = rb_entry(n, struct ceph_mds_request, r_node);
|
|
else
|
|
nextreq = NULL;
|
|
if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
|
|
(req->r_op & CEPH_MDS_OP_WRITE)) {
|
|
/* write op */
|
|
ceph_mdsc_get_request(req);
|
|
if (nextreq)
|
|
ceph_mdsc_get_request(nextreq);
|
|
mutex_unlock(&mdsc->mutex);
|
|
dout("wait_unsafe_requests wait on %llu (want %llu)\n",
|
|
req->r_tid, want_tid);
|
|
wait_for_completion(&req->r_safe_completion);
|
|
mutex_lock(&mdsc->mutex);
|
|
ceph_mdsc_put_request(req);
|
|
if (!nextreq)
|
|
break; /* next dne before, so we're done! */
|
|
if (RB_EMPTY_NODE(&nextreq->r_node)) {
|
|
/* next request was removed from tree */
|
|
ceph_mdsc_put_request(nextreq);
|
|
goto restart;
|
|
}
|
|
ceph_mdsc_put_request(nextreq); /* won't go away */
|
|
}
|
|
req = nextreq;
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
dout("wait_unsafe_requests done\n");
|
|
}
|
|
|
|
void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
|
|
{
|
|
u64 want_tid, want_flush;
|
|
|
|
if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
|
|
return;
|
|
|
|
dout("sync\n");
|
|
mutex_lock(&mdsc->mutex);
|
|
want_tid = mdsc->last_tid;
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
ceph_flush_dirty_caps(mdsc);
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
want_flush = mdsc->last_cap_flush_tid;
|
|
if (!list_empty(&mdsc->cap_flush_list)) {
|
|
struct ceph_cap_flush *cf =
|
|
list_last_entry(&mdsc->cap_flush_list,
|
|
struct ceph_cap_flush, g_list);
|
|
cf->wake = true;
|
|
}
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
|
|
dout("sync want tid %lld flush_seq %lld\n",
|
|
want_tid, want_flush);
|
|
|
|
wait_unsafe_requests(mdsc, want_tid);
|
|
wait_caps_flush(mdsc, want_flush);
|
|
}
|
|
|
|
/*
|
|
* true if all sessions are closed, or we force unmount
|
|
*/
|
|
static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
|
|
{
|
|
if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
|
|
return true;
|
|
return atomic_read(&mdsc->num_sessions) <= skipped;
|
|
}
|
|
|
|
/*
|
|
* called after sb is ro.
|
|
*/
|
|
void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
|
|
{
|
|
struct ceph_options *opts = mdsc->fsc->client->options;
|
|
struct ceph_mds_session *session;
|
|
int i;
|
|
int skipped = 0;
|
|
|
|
dout("close_sessions\n");
|
|
|
|
/* close sessions */
|
|
mutex_lock(&mdsc->mutex);
|
|
for (i = 0; i < mdsc->max_sessions; i++) {
|
|
session = __ceph_lookup_mds_session(mdsc, i);
|
|
if (!session)
|
|
continue;
|
|
mutex_unlock(&mdsc->mutex);
|
|
mutex_lock(&session->s_mutex);
|
|
if (__close_session(mdsc, session) <= 0)
|
|
skipped++;
|
|
mutex_unlock(&session->s_mutex);
|
|
ceph_put_mds_session(session);
|
|
mutex_lock(&mdsc->mutex);
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
dout("waiting for sessions to close\n");
|
|
wait_event_timeout(mdsc->session_close_wq,
|
|
done_closing_sessions(mdsc, skipped),
|
|
ceph_timeout_jiffies(opts->mount_timeout));
|
|
|
|
/* tear down remaining sessions */
|
|
mutex_lock(&mdsc->mutex);
|
|
for (i = 0; i < mdsc->max_sessions; i++) {
|
|
if (mdsc->sessions[i]) {
|
|
session = get_session(mdsc->sessions[i]);
|
|
__unregister_session(mdsc, session);
|
|
mutex_unlock(&mdsc->mutex);
|
|
mutex_lock(&session->s_mutex);
|
|
remove_session_caps(session);
|
|
mutex_unlock(&session->s_mutex);
|
|
ceph_put_mds_session(session);
|
|
mutex_lock(&mdsc->mutex);
|
|
}
|
|
}
|
|
WARN_ON(!list_empty(&mdsc->cap_delay_list));
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
ceph_cleanup_empty_realms(mdsc);
|
|
|
|
cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
|
|
|
|
dout("stopped\n");
|
|
}
|
|
|
|
void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
|
|
{
|
|
struct ceph_mds_session *session;
|
|
int mds;
|
|
|
|
dout("force umount\n");
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
for (mds = 0; mds < mdsc->max_sessions; mds++) {
|
|
session = __ceph_lookup_mds_session(mdsc, mds);
|
|
if (!session)
|
|
continue;
|
|
mutex_unlock(&mdsc->mutex);
|
|
mutex_lock(&session->s_mutex);
|
|
__close_session(mdsc, session);
|
|
if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
|
|
cleanup_session_requests(mdsc, session);
|
|
remove_session_caps(session);
|
|
}
|
|
mutex_unlock(&session->s_mutex);
|
|
ceph_put_mds_session(session);
|
|
mutex_lock(&mdsc->mutex);
|
|
kick_requests(mdsc, mds);
|
|
}
|
|
__wake_requests(mdsc, &mdsc->waiting_for_map);
|
|
mutex_unlock(&mdsc->mutex);
|
|
}
|
|
|
|
static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
|
|
{
|
|
dout("stop\n");
|
|
cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
|
|
if (mdsc->mdsmap)
|
|
ceph_mdsmap_destroy(mdsc->mdsmap);
|
|
kfree(mdsc->sessions);
|
|
ceph_caps_finalize(mdsc);
|
|
ceph_pool_perm_destroy(mdsc);
|
|
}
|
|
|
|
void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
|
|
{
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
dout("mdsc_destroy %p\n", mdsc);
|
|
|
|
if (!mdsc)
|
|
return;
|
|
|
|
/* flush out any connection work with references to us */
|
|
ceph_msgr_flush();
|
|
|
|
ceph_mdsc_stop(mdsc);
|
|
|
|
fsc->mdsc = NULL;
|
|
kfree(mdsc);
|
|
dout("mdsc_destroy %p done\n", mdsc);
|
|
}
|
|
|
|
void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
|
|
{
|
|
struct ceph_fs_client *fsc = mdsc->fsc;
|
|
const char *mds_namespace = fsc->mount_options->mds_namespace;
|
|
void *p = msg->front.iov_base;
|
|
void *end = p + msg->front.iov_len;
|
|
u32 epoch;
|
|
u32 map_len;
|
|
u32 num_fs;
|
|
u32 mount_fscid = (u32)-1;
|
|
u8 struct_v, struct_cv;
|
|
int err = -EINVAL;
|
|
|
|
ceph_decode_need(&p, end, sizeof(u32), bad);
|
|
epoch = ceph_decode_32(&p);
|
|
|
|
dout("handle_fsmap epoch %u\n", epoch);
|
|
|
|
ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
|
|
struct_v = ceph_decode_8(&p);
|
|
struct_cv = ceph_decode_8(&p);
|
|
map_len = ceph_decode_32(&p);
|
|
|
|
ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
|
|
p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
|
|
|
|
num_fs = ceph_decode_32(&p);
|
|
while (num_fs-- > 0) {
|
|
void *info_p, *info_end;
|
|
u32 info_len;
|
|
u8 info_v, info_cv;
|
|
u32 fscid, namelen;
|
|
|
|
ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
|
|
info_v = ceph_decode_8(&p);
|
|
info_cv = ceph_decode_8(&p);
|
|
info_len = ceph_decode_32(&p);
|
|
ceph_decode_need(&p, end, info_len, bad);
|
|
info_p = p;
|
|
info_end = p + info_len;
|
|
p = info_end;
|
|
|
|
ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
|
|
fscid = ceph_decode_32(&info_p);
|
|
namelen = ceph_decode_32(&info_p);
|
|
ceph_decode_need(&info_p, info_end, namelen, bad);
|
|
|
|
if (mds_namespace &&
|
|
strlen(mds_namespace) == namelen &&
|
|
!strncmp(mds_namespace, (char *)info_p, namelen)) {
|
|
mount_fscid = fscid;
|
|
break;
|
|
}
|
|
}
|
|
|
|
ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
|
|
if (mount_fscid != (u32)-1) {
|
|
fsc->client->monc.fs_cluster_id = mount_fscid;
|
|
ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
|
|
0, true);
|
|
ceph_monc_renew_subs(&fsc->client->monc);
|
|
} else {
|
|
err = -ENOENT;
|
|
goto err_out;
|
|
}
|
|
return;
|
|
|
|
bad:
|
|
pr_err("error decoding fsmap\n");
|
|
err_out:
|
|
mutex_lock(&mdsc->mutex);
|
|
mdsc->mdsmap_err = err;
|
|
__wake_requests(mdsc, &mdsc->waiting_for_map);
|
|
mutex_unlock(&mdsc->mutex);
|
|
}
|
|
|
|
/*
|
|
* handle mds map update.
|
|
*/
|
|
void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
|
|
{
|
|
u32 epoch;
|
|
u32 maplen;
|
|
void *p = msg->front.iov_base;
|
|
void *end = p + msg->front.iov_len;
|
|
struct ceph_mdsmap *newmap, *oldmap;
|
|
struct ceph_fsid fsid;
|
|
int err = -EINVAL;
|
|
|
|
ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
|
|
ceph_decode_copy(&p, &fsid, sizeof(fsid));
|
|
if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
|
|
return;
|
|
epoch = ceph_decode_32(&p);
|
|
maplen = ceph_decode_32(&p);
|
|
dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
|
|
|
|
/* do we need it? */
|
|
mutex_lock(&mdsc->mutex);
|
|
if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
|
|
dout("handle_map epoch %u <= our %u\n",
|
|
epoch, mdsc->mdsmap->m_epoch);
|
|
mutex_unlock(&mdsc->mutex);
|
|
return;
|
|
}
|
|
|
|
newmap = ceph_mdsmap_decode(&p, end);
|
|
if (IS_ERR(newmap)) {
|
|
err = PTR_ERR(newmap);
|
|
goto bad_unlock;
|
|
}
|
|
|
|
/* swap into place */
|
|
if (mdsc->mdsmap) {
|
|
oldmap = mdsc->mdsmap;
|
|
mdsc->mdsmap = newmap;
|
|
check_new_map(mdsc, newmap, oldmap);
|
|
ceph_mdsmap_destroy(oldmap);
|
|
} else {
|
|
mdsc->mdsmap = newmap; /* first mds map */
|
|
}
|
|
mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
|
|
MAX_LFS_FILESIZE);
|
|
|
|
__wake_requests(mdsc, &mdsc->waiting_for_map);
|
|
ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
|
|
mdsc->mdsmap->m_epoch);
|
|
|
|
mutex_unlock(&mdsc->mutex);
|
|
schedule_delayed(mdsc);
|
|
return;
|
|
|
|
bad_unlock:
|
|
mutex_unlock(&mdsc->mutex);
|
|
bad:
|
|
pr_err("error decoding mdsmap %d\n", err);
|
|
return;
|
|
}
|
|
|
|
static struct ceph_connection *con_get(struct ceph_connection *con)
|
|
{
|
|
struct ceph_mds_session *s = con->private;
|
|
|
|
if (get_session(s)) {
|
|
dout("mdsc con_get %p ok (%d)\n", s, refcount_read(&s->s_ref));
|
|
return con;
|
|
}
|
|
dout("mdsc con_get %p FAIL\n", s);
|
|
return NULL;
|
|
}
|
|
|
|
static void con_put(struct ceph_connection *con)
|
|
{
|
|
struct ceph_mds_session *s = con->private;
|
|
|
|
dout("mdsc con_put %p (%d)\n", s, refcount_read(&s->s_ref) - 1);
|
|
ceph_put_mds_session(s);
|
|
}
|
|
|
|
/*
|
|
* if the client is unresponsive for long enough, the mds will kill
|
|
* the session entirely.
|
|
*/
|
|
static void peer_reset(struct ceph_connection *con)
|
|
{
|
|
struct ceph_mds_session *s = con->private;
|
|
struct ceph_mds_client *mdsc = s->s_mdsc;
|
|
|
|
pr_warn("mds%d closed our session\n", s->s_mds);
|
|
send_mds_reconnect(mdsc, s);
|
|
}
|
|
|
|
static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
|
|
{
|
|
struct ceph_mds_session *s = con->private;
|
|
struct ceph_mds_client *mdsc = s->s_mdsc;
|
|
int type = le16_to_cpu(msg->hdr.type);
|
|
|
|
mutex_lock(&mdsc->mutex);
|
|
if (__verify_registered_session(mdsc, s) < 0) {
|
|
mutex_unlock(&mdsc->mutex);
|
|
goto out;
|
|
}
|
|
mutex_unlock(&mdsc->mutex);
|
|
|
|
switch (type) {
|
|
case CEPH_MSG_MDS_MAP:
|
|
ceph_mdsc_handle_mdsmap(mdsc, msg);
|
|
break;
|
|
case CEPH_MSG_FS_MAP_USER:
|
|
ceph_mdsc_handle_fsmap(mdsc, msg);
|
|
break;
|
|
case CEPH_MSG_CLIENT_SESSION:
|
|
handle_session(s, msg);
|
|
break;
|
|
case CEPH_MSG_CLIENT_REPLY:
|
|
handle_reply(s, msg);
|
|
break;
|
|
case CEPH_MSG_CLIENT_REQUEST_FORWARD:
|
|
handle_forward(mdsc, s, msg);
|
|
break;
|
|
case CEPH_MSG_CLIENT_CAPS:
|
|
ceph_handle_caps(s, msg);
|
|
break;
|
|
case CEPH_MSG_CLIENT_SNAP:
|
|
ceph_handle_snap(mdsc, s, msg);
|
|
break;
|
|
case CEPH_MSG_CLIENT_LEASE:
|
|
handle_lease(mdsc, s, msg);
|
|
break;
|
|
case CEPH_MSG_CLIENT_QUOTA:
|
|
ceph_handle_quota(mdsc, s, msg);
|
|
break;
|
|
|
|
default:
|
|
pr_err("received unknown message type %d %s\n", type,
|
|
ceph_msg_type_name(type));
|
|
}
|
|
out:
|
|
ceph_msg_put(msg);
|
|
}
|
|
|
|
/*
|
|
* authentication
|
|
*/
|
|
|
|
/*
|
|
* Note: returned pointer is the address of a structure that's
|
|
* managed separately. Caller must *not* attempt to free it.
|
|
*/
|
|
static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
|
|
int *proto, int force_new)
|
|
{
|
|
struct ceph_mds_session *s = con->private;
|
|
struct ceph_mds_client *mdsc = s->s_mdsc;
|
|
struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
|
|
struct ceph_auth_handshake *auth = &s->s_auth;
|
|
|
|
if (force_new && auth->authorizer) {
|
|
ceph_auth_destroy_authorizer(auth->authorizer);
|
|
auth->authorizer = NULL;
|
|
}
|
|
if (!auth->authorizer) {
|
|
int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
|
|
auth);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
} else {
|
|
int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
|
|
auth);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
}
|
|
*proto = ac->protocol;
|
|
|
|
return auth;
|
|
}
|
|
|
|
static int add_authorizer_challenge(struct ceph_connection *con,
|
|
void *challenge_buf, int challenge_buf_len)
|
|
{
|
|
struct ceph_mds_session *s = con->private;
|
|
struct ceph_mds_client *mdsc = s->s_mdsc;
|
|
struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
|
|
|
|
return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
|
|
challenge_buf, challenge_buf_len);
|
|
}
|
|
|
|
static int verify_authorizer_reply(struct ceph_connection *con)
|
|
{
|
|
struct ceph_mds_session *s = con->private;
|
|
struct ceph_mds_client *mdsc = s->s_mdsc;
|
|
struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
|
|
|
|
return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
|
|
}
|
|
|
|
static int invalidate_authorizer(struct ceph_connection *con)
|
|
{
|
|
struct ceph_mds_session *s = con->private;
|
|
struct ceph_mds_client *mdsc = s->s_mdsc;
|
|
struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
|
|
|
|
ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
|
|
|
|
return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
|
|
}
|
|
|
|
static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
|
|
struct ceph_msg_header *hdr, int *skip)
|
|
{
|
|
struct ceph_msg *msg;
|
|
int type = (int) le16_to_cpu(hdr->type);
|
|
int front_len = (int) le32_to_cpu(hdr->front_len);
|
|
|
|
if (con->in_msg)
|
|
return con->in_msg;
|
|
|
|
*skip = 0;
|
|
msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
|
|
if (!msg) {
|
|
pr_err("unable to allocate msg type %d len %d\n",
|
|
type, front_len);
|
|
return NULL;
|
|
}
|
|
|
|
return msg;
|
|
}
|
|
|
|
static int mds_sign_message(struct ceph_msg *msg)
|
|
{
|
|
struct ceph_mds_session *s = msg->con->private;
|
|
struct ceph_auth_handshake *auth = &s->s_auth;
|
|
|
|
return ceph_auth_sign_message(auth, msg);
|
|
}
|
|
|
|
static int mds_check_message_signature(struct ceph_msg *msg)
|
|
{
|
|
struct ceph_mds_session *s = msg->con->private;
|
|
struct ceph_auth_handshake *auth = &s->s_auth;
|
|
|
|
return ceph_auth_check_message_signature(auth, msg);
|
|
}
|
|
|
|
static const struct ceph_connection_operations mds_con_ops = {
|
|
.get = con_get,
|
|
.put = con_put,
|
|
.dispatch = dispatch,
|
|
.get_authorizer = get_authorizer,
|
|
.add_authorizer_challenge = add_authorizer_challenge,
|
|
.verify_authorizer_reply = verify_authorizer_reply,
|
|
.invalidate_authorizer = invalidate_authorizer,
|
|
.peer_reset = peer_reset,
|
|
.alloc_msg = mds_alloc_msg,
|
|
.sign_message = mds_sign_message,
|
|
.check_message_signature = mds_check_message_signature,
|
|
};
|
|
|
|
/* eof */
|