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73737682e0
Variable name ci is mostly used for ceph_inode_info. Variable name fi is mostly used for ceph_file_info. Variable name cf is mostly used for ceph_cap_flush. Change variable name to follow above common rules in case of confusing. Signed-off-by: Chengguang Xu <cgxu519@icloud.com> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
1513 lines
40 KiB
C
1513 lines
40 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/ceph/ceph_debug.h>
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#include <linux/spinlock.h>
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#include <linux/fs_struct.h>
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#include <linux/namei.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/xattr.h>
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#include "super.h"
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#include "mds_client.h"
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/*
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* Directory operations: readdir, lookup, create, link, unlink,
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* rename, etc.
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*/
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/*
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* Ceph MDS operations are specified in terms of a base ino and
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* relative path. Thus, the client can specify an operation on a
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* specific inode (e.g., a getattr due to fstat(2)), or as a path
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* relative to, say, the root directory.
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*
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* Normally, we limit ourselves to strict inode ops (no path component)
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* or dentry operations (a single path component relative to an ino). The
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* exception to this is open_root_dentry(), which will open the mount
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* point by name.
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*/
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const struct dentry_operations ceph_dentry_ops;
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/*
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* Initialize ceph dentry state.
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*/
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static int ceph_d_init(struct dentry *dentry)
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{
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struct ceph_dentry_info *di;
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di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL);
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if (!di)
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return -ENOMEM; /* oh well */
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di->dentry = dentry;
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di->lease_session = NULL;
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di->time = jiffies;
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dentry->d_fsdata = di;
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ceph_dentry_lru_add(dentry);
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return 0;
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}
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/*
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* for f_pos for readdir:
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* - hash order:
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* (0xff << 52) | ((24 bits hash) << 28) |
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* (the nth entry has hash collision);
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* - frag+name order;
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* ((frag value) << 28) | (the nth entry in frag);
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*/
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#define OFFSET_BITS 28
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#define OFFSET_MASK ((1 << OFFSET_BITS) - 1)
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#define HASH_ORDER (0xffull << (OFFSET_BITS + 24))
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loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order)
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{
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loff_t fpos = ((loff_t)high << 28) | (loff_t)off;
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if (hash_order)
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fpos |= HASH_ORDER;
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return fpos;
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}
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static bool is_hash_order(loff_t p)
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{
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return (p & HASH_ORDER) == HASH_ORDER;
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}
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static unsigned fpos_frag(loff_t p)
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{
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return p >> OFFSET_BITS;
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}
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static unsigned fpos_hash(loff_t p)
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{
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return ceph_frag_value(fpos_frag(p));
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}
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static unsigned fpos_off(loff_t p)
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{
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return p & OFFSET_MASK;
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}
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static int fpos_cmp(loff_t l, loff_t r)
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{
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int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));
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if (v)
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return v;
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return (int)(fpos_off(l) - fpos_off(r));
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}
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/*
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* make note of the last dentry we read, so we can
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* continue at the same lexicographical point,
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* regardless of what dir changes take place on the
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* server.
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*/
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static int note_last_dentry(struct ceph_file_info *fi, const char *name,
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int len, unsigned next_offset)
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{
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char *buf = kmalloc(len+1, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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kfree(fi->last_name);
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fi->last_name = buf;
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memcpy(fi->last_name, name, len);
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fi->last_name[len] = 0;
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fi->next_offset = next_offset;
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dout("note_last_dentry '%s'\n", fi->last_name);
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return 0;
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}
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static struct dentry *
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__dcache_find_get_entry(struct dentry *parent, u64 idx,
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struct ceph_readdir_cache_control *cache_ctl)
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{
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struct inode *dir = d_inode(parent);
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struct dentry *dentry;
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unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1;
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loff_t ptr_pos = idx * sizeof(struct dentry *);
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pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT;
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if (ptr_pos >= i_size_read(dir))
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return NULL;
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if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) {
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ceph_readdir_cache_release(cache_ctl);
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cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff);
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if (!cache_ctl->page) {
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dout(" page %lu not found\n", ptr_pgoff);
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return ERR_PTR(-EAGAIN);
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}
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/* reading/filling the cache are serialized by
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i_mutex, no need to use page lock */
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unlock_page(cache_ctl->page);
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cache_ctl->dentries = kmap(cache_ctl->page);
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}
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cache_ctl->index = idx & idx_mask;
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rcu_read_lock();
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spin_lock(&parent->d_lock);
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/* check i_size again here, because empty directory can be
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* marked as complete while not holding the i_mutex. */
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if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir))
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dentry = cache_ctl->dentries[cache_ctl->index];
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else
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dentry = NULL;
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spin_unlock(&parent->d_lock);
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if (dentry && !lockref_get_not_dead(&dentry->d_lockref))
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dentry = NULL;
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rcu_read_unlock();
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return dentry ? : ERR_PTR(-EAGAIN);
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}
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/*
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* When possible, we try to satisfy a readdir by peeking at the
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* dcache. We make this work by carefully ordering dentries on
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* d_child when we initially get results back from the MDS, and
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* falling back to a "normal" sync readdir if any dentries in the dir
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* are dropped.
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*
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* Complete dir indicates that we have all dentries in the dir. It is
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* defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
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* the MDS if/when the directory is modified).
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*/
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static int __dcache_readdir(struct file *file, struct dir_context *ctx,
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int shared_gen)
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{
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struct ceph_file_info *fi = file->private_data;
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struct dentry *parent = file->f_path.dentry;
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struct inode *dir = d_inode(parent);
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struct dentry *dentry, *last = NULL;
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struct ceph_dentry_info *di;
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struct ceph_readdir_cache_control cache_ctl = {};
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u64 idx = 0;
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int err = 0;
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dout("__dcache_readdir %p v%u at %llx\n", dir, (unsigned)shared_gen, ctx->pos);
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/* search start position */
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if (ctx->pos > 2) {
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u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *));
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while (count > 0) {
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u64 step = count >> 1;
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dentry = __dcache_find_get_entry(parent, idx + step,
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&cache_ctl);
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if (!dentry) {
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/* use linar search */
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idx = 0;
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break;
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}
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if (IS_ERR(dentry)) {
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err = PTR_ERR(dentry);
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goto out;
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}
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di = ceph_dentry(dentry);
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spin_lock(&dentry->d_lock);
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if (fpos_cmp(di->offset, ctx->pos) < 0) {
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idx += step + 1;
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count -= step + 1;
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} else {
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count = step;
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}
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spin_unlock(&dentry->d_lock);
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dput(dentry);
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}
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dout("__dcache_readdir %p cache idx %llu\n", dir, idx);
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}
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for (;;) {
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bool emit_dentry = false;
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dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl);
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if (!dentry) {
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fi->flags |= CEPH_F_ATEND;
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err = 0;
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break;
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}
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if (IS_ERR(dentry)) {
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err = PTR_ERR(dentry);
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goto out;
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}
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spin_lock(&dentry->d_lock);
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di = ceph_dentry(dentry);
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if (d_unhashed(dentry) ||
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d_really_is_negative(dentry) ||
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di->lease_shared_gen != shared_gen) {
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spin_unlock(&dentry->d_lock);
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dput(dentry);
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err = -EAGAIN;
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goto out;
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}
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if (fpos_cmp(ctx->pos, di->offset) <= 0) {
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emit_dentry = true;
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}
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spin_unlock(&dentry->d_lock);
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if (emit_dentry) {
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dout(" %llx dentry %p %pd %p\n", di->offset,
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dentry, dentry, d_inode(dentry));
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ctx->pos = di->offset;
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if (!dir_emit(ctx, dentry->d_name.name,
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dentry->d_name.len,
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ceph_translate_ino(dentry->d_sb,
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d_inode(dentry)->i_ino),
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d_inode(dentry)->i_mode >> 12)) {
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dput(dentry);
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err = 0;
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break;
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}
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ctx->pos++;
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if (last)
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dput(last);
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last = dentry;
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} else {
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dput(dentry);
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}
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}
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out:
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ceph_readdir_cache_release(&cache_ctl);
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if (last) {
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int ret;
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di = ceph_dentry(last);
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ret = note_last_dentry(fi, last->d_name.name, last->d_name.len,
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fpos_off(di->offset) + 1);
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if (ret < 0)
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err = ret;
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dput(last);
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/* last_name no longer match cache index */
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if (fi->readdir_cache_idx >= 0) {
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fi->readdir_cache_idx = -1;
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fi->dir_release_count = 0;
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}
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}
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return err;
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}
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static bool need_send_readdir(struct ceph_file_info *fi, loff_t pos)
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{
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if (!fi->last_readdir)
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return true;
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if (is_hash_order(pos))
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return !ceph_frag_contains_value(fi->frag, fpos_hash(pos));
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else
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return fi->frag != fpos_frag(pos);
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}
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static int ceph_readdir(struct file *file, struct dir_context *ctx)
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{
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struct ceph_file_info *fi = file->private_data;
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struct inode *inode = file_inode(file);
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struct ceph_inode_info *ci = ceph_inode(inode);
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struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
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struct ceph_mds_client *mdsc = fsc->mdsc;
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int i;
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int err;
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unsigned frag = -1;
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struct ceph_mds_reply_info_parsed *rinfo;
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dout("readdir %p file %p pos %llx\n", inode, file, ctx->pos);
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if (fi->flags & CEPH_F_ATEND)
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return 0;
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/* always start with . and .. */
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if (ctx->pos == 0) {
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dout("readdir off 0 -> '.'\n");
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if (!dir_emit(ctx, ".", 1,
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ceph_translate_ino(inode->i_sb, inode->i_ino),
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inode->i_mode >> 12))
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return 0;
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ctx->pos = 1;
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}
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if (ctx->pos == 1) {
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ino_t ino = parent_ino(file->f_path.dentry);
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dout("readdir off 1 -> '..'\n");
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if (!dir_emit(ctx, "..", 2,
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ceph_translate_ino(inode->i_sb, ino),
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inode->i_mode >> 12))
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return 0;
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ctx->pos = 2;
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}
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/* can we use the dcache? */
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spin_lock(&ci->i_ceph_lock);
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if (ceph_test_mount_opt(fsc, DCACHE) &&
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!ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
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ceph_snap(inode) != CEPH_SNAPDIR &&
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__ceph_dir_is_complete_ordered(ci) &&
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__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
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int shared_gen = atomic_read(&ci->i_shared_gen);
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spin_unlock(&ci->i_ceph_lock);
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err = __dcache_readdir(file, ctx, shared_gen);
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if (err != -EAGAIN)
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return err;
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} else {
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spin_unlock(&ci->i_ceph_lock);
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}
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/* proceed with a normal readdir */
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more:
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/* do we have the correct frag content buffered? */
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if (need_send_readdir(fi, ctx->pos)) {
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struct ceph_mds_request *req;
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int op = ceph_snap(inode) == CEPH_SNAPDIR ?
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CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
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/* discard old result, if any */
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if (fi->last_readdir) {
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ceph_mdsc_put_request(fi->last_readdir);
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fi->last_readdir = NULL;
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}
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if (is_hash_order(ctx->pos)) {
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/* fragtree isn't always accurate. choose frag
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* based on previous reply when possible. */
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if (frag == (unsigned)-1)
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frag = ceph_choose_frag(ci, fpos_hash(ctx->pos),
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NULL, NULL);
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} else {
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frag = fpos_frag(ctx->pos);
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}
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dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
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ceph_vinop(inode), frag, fi->last_name);
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req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
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if (IS_ERR(req))
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return PTR_ERR(req);
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err = ceph_alloc_readdir_reply_buffer(req, inode);
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if (err) {
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ceph_mdsc_put_request(req);
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return err;
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}
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/* hints to request -> mds selection code */
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req->r_direct_mode = USE_AUTH_MDS;
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if (op == CEPH_MDS_OP_READDIR) {
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req->r_direct_hash = ceph_frag_value(frag);
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__set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
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req->r_inode_drop = CEPH_CAP_FILE_EXCL;
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}
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if (fi->last_name) {
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req->r_path2 = kstrdup(fi->last_name, GFP_KERNEL);
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if (!req->r_path2) {
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ceph_mdsc_put_request(req);
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return -ENOMEM;
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}
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} else if (is_hash_order(ctx->pos)) {
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req->r_args.readdir.offset_hash =
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cpu_to_le32(fpos_hash(ctx->pos));
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}
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req->r_dir_release_cnt = fi->dir_release_count;
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req->r_dir_ordered_cnt = fi->dir_ordered_count;
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req->r_readdir_cache_idx = fi->readdir_cache_idx;
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req->r_readdir_offset = fi->next_offset;
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req->r_args.readdir.frag = cpu_to_le32(frag);
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req->r_args.readdir.flags =
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cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS);
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req->r_inode = inode;
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ihold(inode);
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req->r_dentry = dget(file->f_path.dentry);
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err = ceph_mdsc_do_request(mdsc, NULL, req);
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if (err < 0) {
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ceph_mdsc_put_request(req);
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return err;
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}
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dout("readdir got and parsed readdir result=%d on "
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"frag %x, end=%d, complete=%d, hash_order=%d\n",
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err, frag,
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(int)req->r_reply_info.dir_end,
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(int)req->r_reply_info.dir_complete,
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(int)req->r_reply_info.hash_order);
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rinfo = &req->r_reply_info;
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if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
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frag = le32_to_cpu(rinfo->dir_dir->frag);
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if (!rinfo->hash_order) {
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fi->next_offset = req->r_readdir_offset;
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/* adjust ctx->pos to beginning of frag */
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ctx->pos = ceph_make_fpos(frag,
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fi->next_offset,
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false);
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}
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}
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fi->frag = frag;
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fi->last_readdir = req;
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if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) {
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fi->readdir_cache_idx = req->r_readdir_cache_idx;
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if (fi->readdir_cache_idx < 0) {
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/* preclude from marking dir ordered */
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fi->dir_ordered_count = 0;
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} else if (ceph_frag_is_leftmost(frag) &&
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fi->next_offset == 2) {
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/* note dir version at start of readdir so
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* we can tell if any dentries get dropped */
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fi->dir_release_count = req->r_dir_release_cnt;
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fi->dir_ordered_count = req->r_dir_ordered_cnt;
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}
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} else {
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dout("readdir !did_prepopulate\n");
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/* disable readdir cache */
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fi->readdir_cache_idx = -1;
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/* preclude from marking dir complete */
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fi->dir_release_count = 0;
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}
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/* note next offset and last dentry name */
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if (rinfo->dir_nr > 0) {
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struct ceph_mds_reply_dir_entry *rde =
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rinfo->dir_entries + (rinfo->dir_nr-1);
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unsigned next_offset = req->r_reply_info.dir_end ?
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2 : (fpos_off(rde->offset) + 1);
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err = note_last_dentry(fi, rde->name, rde->name_len,
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next_offset);
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if (err)
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return err;
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} else if (req->r_reply_info.dir_end) {
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fi->next_offset = 2;
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/* keep last name */
|
|
}
|
|
}
|
|
|
|
rinfo = &fi->last_readdir->r_reply_info;
|
|
dout("readdir frag %x num %d pos %llx chunk first %llx\n",
|
|
fi->frag, rinfo->dir_nr, ctx->pos,
|
|
rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL);
|
|
|
|
i = 0;
|
|
/* search start position */
|
|
if (rinfo->dir_nr > 0) {
|
|
int step, nr = rinfo->dir_nr;
|
|
while (nr > 0) {
|
|
step = nr >> 1;
|
|
if (rinfo->dir_entries[i + step].offset < ctx->pos) {
|
|
i += step + 1;
|
|
nr -= step + 1;
|
|
} else {
|
|
nr = step;
|
|
}
|
|
}
|
|
}
|
|
for (; i < rinfo->dir_nr; i++) {
|
|
struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
|
|
struct ceph_vino vino;
|
|
ino_t ino;
|
|
u32 ftype;
|
|
|
|
BUG_ON(rde->offset < ctx->pos);
|
|
|
|
ctx->pos = rde->offset;
|
|
dout("readdir (%d/%d) -> %llx '%.*s' %p\n",
|
|
i, rinfo->dir_nr, ctx->pos,
|
|
rde->name_len, rde->name, &rde->inode.in);
|
|
|
|
BUG_ON(!rde->inode.in);
|
|
ftype = le32_to_cpu(rde->inode.in->mode) >> 12;
|
|
vino.ino = le64_to_cpu(rde->inode.in->ino);
|
|
vino.snap = le64_to_cpu(rde->inode.in->snapid);
|
|
ino = ceph_vino_to_ino(vino);
|
|
|
|
if (!dir_emit(ctx, rde->name, rde->name_len,
|
|
ceph_translate_ino(inode->i_sb, ino), ftype)) {
|
|
dout("filldir stopping us...\n");
|
|
return 0;
|
|
}
|
|
ctx->pos++;
|
|
}
|
|
|
|
ceph_mdsc_put_request(fi->last_readdir);
|
|
fi->last_readdir = NULL;
|
|
|
|
if (fi->next_offset > 2) {
|
|
frag = fi->frag;
|
|
goto more;
|
|
}
|
|
|
|
/* more frags? */
|
|
if (!ceph_frag_is_rightmost(fi->frag)) {
|
|
frag = ceph_frag_next(fi->frag);
|
|
if (is_hash_order(ctx->pos)) {
|
|
loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag),
|
|
fi->next_offset, true);
|
|
if (new_pos > ctx->pos)
|
|
ctx->pos = new_pos;
|
|
/* keep last_name */
|
|
} else {
|
|
ctx->pos = ceph_make_fpos(frag, fi->next_offset, false);
|
|
kfree(fi->last_name);
|
|
fi->last_name = NULL;
|
|
}
|
|
dout("readdir next frag is %x\n", frag);
|
|
goto more;
|
|
}
|
|
fi->flags |= CEPH_F_ATEND;
|
|
|
|
/*
|
|
* if dir_release_count still matches the dir, no dentries
|
|
* were released during the whole readdir, and we should have
|
|
* the complete dir contents in our cache.
|
|
*/
|
|
if (atomic64_read(&ci->i_release_count) == fi->dir_release_count) {
|
|
spin_lock(&ci->i_ceph_lock);
|
|
if (fi->dir_ordered_count == atomic64_read(&ci->i_ordered_count)) {
|
|
dout(" marking %p complete and ordered\n", inode);
|
|
/* use i_size to track number of entries in
|
|
* readdir cache */
|
|
BUG_ON(fi->readdir_cache_idx < 0);
|
|
i_size_write(inode, fi->readdir_cache_idx *
|
|
sizeof(struct dentry*));
|
|
} else {
|
|
dout(" marking %p complete\n", inode);
|
|
}
|
|
__ceph_dir_set_complete(ci, fi->dir_release_count,
|
|
fi->dir_ordered_count);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
}
|
|
|
|
dout("readdir %p file %p done.\n", inode, file);
|
|
return 0;
|
|
}
|
|
|
|
static void reset_readdir(struct ceph_file_info *fi)
|
|
{
|
|
if (fi->last_readdir) {
|
|
ceph_mdsc_put_request(fi->last_readdir);
|
|
fi->last_readdir = NULL;
|
|
}
|
|
kfree(fi->last_name);
|
|
fi->last_name = NULL;
|
|
fi->dir_release_count = 0;
|
|
fi->readdir_cache_idx = -1;
|
|
fi->next_offset = 2; /* compensate for . and .. */
|
|
fi->flags &= ~CEPH_F_ATEND;
|
|
}
|
|
|
|
/*
|
|
* discard buffered readdir content on seekdir(0), or seek to new frag,
|
|
* or seek prior to current chunk
|
|
*/
|
|
static bool need_reset_readdir(struct ceph_file_info *fi, loff_t new_pos)
|
|
{
|
|
struct ceph_mds_reply_info_parsed *rinfo;
|
|
loff_t chunk_offset;
|
|
if (new_pos == 0)
|
|
return true;
|
|
if (is_hash_order(new_pos)) {
|
|
/* no need to reset last_name for a forward seek when
|
|
* dentries are sotred in hash order */
|
|
} else if (fi->frag != fpos_frag(new_pos)) {
|
|
return true;
|
|
}
|
|
rinfo = fi->last_readdir ? &fi->last_readdir->r_reply_info : NULL;
|
|
if (!rinfo || !rinfo->dir_nr)
|
|
return true;
|
|
chunk_offset = rinfo->dir_entries[0].offset;
|
|
return new_pos < chunk_offset ||
|
|
is_hash_order(new_pos) != is_hash_order(chunk_offset);
|
|
}
|
|
|
|
static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
|
|
{
|
|
struct ceph_file_info *fi = file->private_data;
|
|
struct inode *inode = file->f_mapping->host;
|
|
loff_t retval;
|
|
|
|
inode_lock(inode);
|
|
retval = -EINVAL;
|
|
switch (whence) {
|
|
case SEEK_CUR:
|
|
offset += file->f_pos;
|
|
case SEEK_SET:
|
|
break;
|
|
case SEEK_END:
|
|
retval = -EOPNOTSUPP;
|
|
default:
|
|
goto out;
|
|
}
|
|
|
|
if (offset >= 0) {
|
|
if (need_reset_readdir(fi, offset)) {
|
|
dout("dir_llseek dropping %p content\n", file);
|
|
reset_readdir(fi);
|
|
} else if (is_hash_order(offset) && offset > file->f_pos) {
|
|
/* for hash offset, we don't know if a forward seek
|
|
* is within same frag */
|
|
fi->dir_release_count = 0;
|
|
fi->readdir_cache_idx = -1;
|
|
}
|
|
|
|
if (offset != file->f_pos) {
|
|
file->f_pos = offset;
|
|
file->f_version = 0;
|
|
fi->flags &= ~CEPH_F_ATEND;
|
|
}
|
|
retval = offset;
|
|
}
|
|
out:
|
|
inode_unlock(inode);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Handle lookups for the hidden .snap directory.
|
|
*/
|
|
int ceph_handle_snapdir(struct ceph_mds_request *req,
|
|
struct dentry *dentry, int err)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
|
|
struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */
|
|
|
|
/* .snap dir? */
|
|
if (err == -ENOENT &&
|
|
ceph_snap(parent) == CEPH_NOSNAP &&
|
|
strcmp(dentry->d_name.name,
|
|
fsc->mount_options->snapdir_name) == 0) {
|
|
struct inode *inode = ceph_get_snapdir(parent);
|
|
dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n",
|
|
dentry, dentry, inode);
|
|
BUG_ON(!d_unhashed(dentry));
|
|
d_add(dentry, inode);
|
|
err = 0;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Figure out final result of a lookup/open request.
|
|
*
|
|
* Mainly, make sure we return the final req->r_dentry (if it already
|
|
* existed) in place of the original VFS-provided dentry when they
|
|
* differ.
|
|
*
|
|
* Gracefully handle the case where the MDS replies with -ENOENT and
|
|
* no trace (which it may do, at its discretion, e.g., if it doesn't
|
|
* care to issue a lease on the negative dentry).
|
|
*/
|
|
struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
|
|
struct dentry *dentry, int err)
|
|
{
|
|
if (err == -ENOENT) {
|
|
/* no trace? */
|
|
err = 0;
|
|
if (!req->r_reply_info.head->is_dentry) {
|
|
dout("ENOENT and no trace, dentry %p inode %p\n",
|
|
dentry, d_inode(dentry));
|
|
if (d_really_is_positive(dentry)) {
|
|
d_drop(dentry);
|
|
err = -ENOENT;
|
|
} else {
|
|
d_add(dentry, NULL);
|
|
}
|
|
}
|
|
}
|
|
if (err)
|
|
dentry = ERR_PTR(err);
|
|
else if (dentry != req->r_dentry)
|
|
dentry = dget(req->r_dentry); /* we got spliced */
|
|
else
|
|
dentry = NULL;
|
|
return dentry;
|
|
}
|
|
|
|
static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
|
|
{
|
|
return ceph_ino(inode) == CEPH_INO_ROOT &&
|
|
strncmp(dentry->d_name.name, ".ceph", 5) == 0;
|
|
}
|
|
|
|
/*
|
|
* Look up a single dir entry. If there is a lookup intent, inform
|
|
* the MDS so that it gets our 'caps wanted' value in a single op.
|
|
*/
|
|
static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
|
|
unsigned int flags)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct ceph_mds_request *req;
|
|
int op;
|
|
int mask;
|
|
int err;
|
|
|
|
dout("lookup %p dentry %p '%pd'\n",
|
|
dir, dentry, dentry);
|
|
|
|
if (dentry->d_name.len > NAME_MAX)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
/* can we conclude ENOENT locally? */
|
|
if (d_really_is_negative(dentry)) {
|
|
struct ceph_inode_info *ci = ceph_inode(dir);
|
|
struct ceph_dentry_info *di = ceph_dentry(dentry);
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
|
|
if (strncmp(dentry->d_name.name,
|
|
fsc->mount_options->snapdir_name,
|
|
dentry->d_name.len) &&
|
|
!is_root_ceph_dentry(dir, dentry) &&
|
|
ceph_test_mount_opt(fsc, DCACHE) &&
|
|
__ceph_dir_is_complete(ci) &&
|
|
(__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
dout(" dir %p complete, -ENOENT\n", dir);
|
|
d_add(dentry, NULL);
|
|
di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
|
|
return NULL;
|
|
}
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
}
|
|
|
|
op = ceph_snap(dir) == CEPH_SNAPDIR ?
|
|
CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
|
|
req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
|
|
if (IS_ERR(req))
|
|
return ERR_CAST(req);
|
|
req->r_dentry = dget(dentry);
|
|
req->r_num_caps = 2;
|
|
|
|
mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
|
|
if (ceph_security_xattr_wanted(dir))
|
|
mask |= CEPH_CAP_XATTR_SHARED;
|
|
req->r_args.getattr.mask = cpu_to_le32(mask);
|
|
|
|
req->r_parent = dir;
|
|
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
|
|
err = ceph_mdsc_do_request(mdsc, NULL, req);
|
|
err = ceph_handle_snapdir(req, dentry, err);
|
|
dentry = ceph_finish_lookup(req, dentry, err);
|
|
ceph_mdsc_put_request(req); /* will dput(dentry) */
|
|
dout("lookup result=%p\n", dentry);
|
|
return dentry;
|
|
}
|
|
|
|
/*
|
|
* If we do a create but get no trace back from the MDS, follow up with
|
|
* a lookup (the VFS expects us to link up the provided dentry).
|
|
*/
|
|
int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct dentry *result = ceph_lookup(dir, dentry, 0);
|
|
|
|
if (result && !IS_ERR(result)) {
|
|
/*
|
|
* We created the item, then did a lookup, and found
|
|
* it was already linked to another inode we already
|
|
* had in our cache (and thus got spliced). To not
|
|
* confuse VFS (especially when inode is a directory),
|
|
* we don't link our dentry to that inode, return an
|
|
* error instead.
|
|
*
|
|
* This event should be rare and it happens only when
|
|
* we talk to old MDS. Recent MDS does not send traceless
|
|
* reply for request that creates new inode.
|
|
*/
|
|
d_drop(result);
|
|
return -ESTALE;
|
|
}
|
|
return PTR_ERR(result);
|
|
}
|
|
|
|
static int ceph_mknod(struct inode *dir, struct dentry *dentry,
|
|
umode_t mode, dev_t rdev)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct ceph_mds_request *req;
|
|
struct ceph_acls_info acls = {};
|
|
int err;
|
|
|
|
if (ceph_snap(dir) != CEPH_NOSNAP)
|
|
return -EROFS;
|
|
|
|
err = ceph_pre_init_acls(dir, &mode, &acls);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
|
|
dir, dentry, mode, rdev);
|
|
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto out;
|
|
}
|
|
req->r_dentry = dget(dentry);
|
|
req->r_num_caps = 2;
|
|
req->r_parent = dir;
|
|
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
|
|
req->r_args.mknod.mode = cpu_to_le32(mode);
|
|
req->r_args.mknod.rdev = cpu_to_le32(rdev);
|
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
|
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
|
|
if (acls.pagelist) {
|
|
req->r_pagelist = acls.pagelist;
|
|
acls.pagelist = NULL;
|
|
}
|
|
err = ceph_mdsc_do_request(mdsc, dir, req);
|
|
if (!err && !req->r_reply_info.head->is_dentry)
|
|
err = ceph_handle_notrace_create(dir, dentry);
|
|
ceph_mdsc_put_request(req);
|
|
out:
|
|
if (!err)
|
|
ceph_init_inode_acls(d_inode(dentry), &acls);
|
|
else
|
|
d_drop(dentry);
|
|
ceph_release_acls_info(&acls);
|
|
return err;
|
|
}
|
|
|
|
static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
|
|
bool excl)
|
|
{
|
|
return ceph_mknod(dir, dentry, mode, 0);
|
|
}
|
|
|
|
static int ceph_symlink(struct inode *dir, struct dentry *dentry,
|
|
const char *dest)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct ceph_mds_request *req;
|
|
int err;
|
|
|
|
if (ceph_snap(dir) != CEPH_NOSNAP)
|
|
return -EROFS;
|
|
|
|
dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
|
|
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto out;
|
|
}
|
|
req->r_path2 = kstrdup(dest, GFP_KERNEL);
|
|
if (!req->r_path2) {
|
|
err = -ENOMEM;
|
|
ceph_mdsc_put_request(req);
|
|
goto out;
|
|
}
|
|
req->r_parent = dir;
|
|
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
|
|
req->r_dentry = dget(dentry);
|
|
req->r_num_caps = 2;
|
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
|
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
|
|
err = ceph_mdsc_do_request(mdsc, dir, req);
|
|
if (!err && !req->r_reply_info.head->is_dentry)
|
|
err = ceph_handle_notrace_create(dir, dentry);
|
|
ceph_mdsc_put_request(req);
|
|
out:
|
|
if (err)
|
|
d_drop(dentry);
|
|
return err;
|
|
}
|
|
|
|
static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct ceph_mds_request *req;
|
|
struct ceph_acls_info acls = {};
|
|
int err = -EROFS;
|
|
int op;
|
|
|
|
if (ceph_snap(dir) == CEPH_SNAPDIR) {
|
|
/* mkdir .snap/foo is a MKSNAP */
|
|
op = CEPH_MDS_OP_MKSNAP;
|
|
dout("mksnap dir %p snap '%pd' dn %p\n", dir,
|
|
dentry, dentry);
|
|
} else if (ceph_snap(dir) == CEPH_NOSNAP) {
|
|
dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
|
|
op = CEPH_MDS_OP_MKDIR;
|
|
} else {
|
|
goto out;
|
|
}
|
|
|
|
mode |= S_IFDIR;
|
|
err = ceph_pre_init_acls(dir, &mode, &acls);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto out;
|
|
}
|
|
|
|
req->r_dentry = dget(dentry);
|
|
req->r_num_caps = 2;
|
|
req->r_parent = dir;
|
|
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
|
|
req->r_args.mkdir.mode = cpu_to_le32(mode);
|
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
|
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
|
|
if (acls.pagelist) {
|
|
req->r_pagelist = acls.pagelist;
|
|
acls.pagelist = NULL;
|
|
}
|
|
err = ceph_mdsc_do_request(mdsc, dir, req);
|
|
if (!err &&
|
|
!req->r_reply_info.head->is_target &&
|
|
!req->r_reply_info.head->is_dentry)
|
|
err = ceph_handle_notrace_create(dir, dentry);
|
|
ceph_mdsc_put_request(req);
|
|
out:
|
|
if (!err)
|
|
ceph_init_inode_acls(d_inode(dentry), &acls);
|
|
else
|
|
d_drop(dentry);
|
|
ceph_release_acls_info(&acls);
|
|
return err;
|
|
}
|
|
|
|
static int ceph_link(struct dentry *old_dentry, struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct ceph_mds_request *req;
|
|
int err;
|
|
|
|
if (ceph_snap(dir) != CEPH_NOSNAP)
|
|
return -EROFS;
|
|
|
|
dout("link in dir %p old_dentry %p dentry %p\n", dir,
|
|
old_dentry, dentry);
|
|
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
|
|
if (IS_ERR(req)) {
|
|
d_drop(dentry);
|
|
return PTR_ERR(req);
|
|
}
|
|
req->r_dentry = dget(dentry);
|
|
req->r_num_caps = 2;
|
|
req->r_old_dentry = dget(old_dentry);
|
|
req->r_parent = dir;
|
|
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
|
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
|
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
|
|
/* release LINK_SHARED on source inode (mds will lock it) */
|
|
req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
|
|
err = ceph_mdsc_do_request(mdsc, dir, req);
|
|
if (err) {
|
|
d_drop(dentry);
|
|
} else if (!req->r_reply_info.head->is_dentry) {
|
|
ihold(d_inode(old_dentry));
|
|
d_instantiate(dentry, d_inode(old_dentry));
|
|
}
|
|
ceph_mdsc_put_request(req);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* rmdir and unlink are differ only by the metadata op code
|
|
*/
|
|
static int ceph_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct inode *inode = d_inode(dentry);
|
|
struct ceph_mds_request *req;
|
|
int err = -EROFS;
|
|
int op;
|
|
|
|
if (ceph_snap(dir) == CEPH_SNAPDIR) {
|
|
/* rmdir .snap/foo is RMSNAP */
|
|
dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry);
|
|
op = CEPH_MDS_OP_RMSNAP;
|
|
} else if (ceph_snap(dir) == CEPH_NOSNAP) {
|
|
dout("unlink/rmdir dir %p dn %p inode %p\n",
|
|
dir, dentry, inode);
|
|
op = d_is_dir(dentry) ?
|
|
CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
|
|
} else
|
|
goto out;
|
|
req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto out;
|
|
}
|
|
req->r_dentry = dget(dentry);
|
|
req->r_num_caps = 2;
|
|
req->r_parent = dir;
|
|
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
|
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
|
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
|
|
req->r_inode_drop = ceph_drop_caps_for_unlink(inode);
|
|
err = ceph_mdsc_do_request(mdsc, dir, req);
|
|
if (!err && !req->r_reply_info.head->is_dentry)
|
|
d_delete(dentry);
|
|
ceph_mdsc_put_request(req);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry,
|
|
unsigned int flags)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct ceph_mds_request *req;
|
|
int op = CEPH_MDS_OP_RENAME;
|
|
int err;
|
|
|
|
if (flags)
|
|
return -EINVAL;
|
|
|
|
if (ceph_snap(old_dir) != ceph_snap(new_dir))
|
|
return -EXDEV;
|
|
if (ceph_snap(old_dir) != CEPH_NOSNAP) {
|
|
if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR)
|
|
op = CEPH_MDS_OP_RENAMESNAP;
|
|
else
|
|
return -EROFS;
|
|
}
|
|
dout("rename dir %p dentry %p to dir %p dentry %p\n",
|
|
old_dir, old_dentry, new_dir, new_dentry);
|
|
req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
ihold(old_dir);
|
|
req->r_dentry = dget(new_dentry);
|
|
req->r_num_caps = 2;
|
|
req->r_old_dentry = dget(old_dentry);
|
|
req->r_old_dentry_dir = old_dir;
|
|
req->r_parent = new_dir;
|
|
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
|
|
req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
|
|
req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
|
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
|
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
|
|
/* release LINK_RDCACHE on source inode (mds will lock it) */
|
|
req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;
|
|
if (d_really_is_positive(new_dentry)) {
|
|
req->r_inode_drop =
|
|
ceph_drop_caps_for_unlink(d_inode(new_dentry));
|
|
}
|
|
err = ceph_mdsc_do_request(mdsc, old_dir, req);
|
|
if (!err && !req->r_reply_info.head->is_dentry) {
|
|
/*
|
|
* Normally d_move() is done by fill_trace (called by
|
|
* do_request, above). If there is no trace, we need
|
|
* to do it here.
|
|
*/
|
|
d_move(old_dentry, new_dentry);
|
|
}
|
|
ceph_mdsc_put_request(req);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Ensure a dentry lease will no longer revalidate.
|
|
*/
|
|
void ceph_invalidate_dentry_lease(struct dentry *dentry)
|
|
{
|
|
spin_lock(&dentry->d_lock);
|
|
ceph_dentry(dentry)->time = jiffies;
|
|
ceph_dentry(dentry)->lease_shared_gen = 0;
|
|
spin_unlock(&dentry->d_lock);
|
|
}
|
|
|
|
/*
|
|
* Check if dentry lease is valid. If not, delete the lease. Try to
|
|
* renew if the least is more than half up.
|
|
*/
|
|
static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags,
|
|
struct inode *dir)
|
|
{
|
|
struct ceph_dentry_info *di;
|
|
struct ceph_mds_session *s;
|
|
int valid = 0;
|
|
u32 gen;
|
|
unsigned long ttl;
|
|
struct ceph_mds_session *session = NULL;
|
|
u32 seq = 0;
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
di = ceph_dentry(dentry);
|
|
if (di && di->lease_session) {
|
|
s = di->lease_session;
|
|
spin_lock(&s->s_gen_ttl_lock);
|
|
gen = s->s_cap_gen;
|
|
ttl = s->s_cap_ttl;
|
|
spin_unlock(&s->s_gen_ttl_lock);
|
|
|
|
if (di->lease_gen == gen &&
|
|
time_before(jiffies, di->time) &&
|
|
time_before(jiffies, ttl)) {
|
|
valid = 1;
|
|
if (di->lease_renew_after &&
|
|
time_after(jiffies, di->lease_renew_after)) {
|
|
/*
|
|
* We should renew. If we're in RCU walk mode
|
|
* though, we can't do that so just return
|
|
* -ECHILD.
|
|
*/
|
|
if (flags & LOOKUP_RCU) {
|
|
valid = -ECHILD;
|
|
} else {
|
|
session = ceph_get_mds_session(s);
|
|
seq = di->lease_seq;
|
|
di->lease_renew_after = 0;
|
|
di->lease_renew_from = jiffies;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
if (session) {
|
|
ceph_mdsc_lease_send_msg(session, dir, dentry,
|
|
CEPH_MDS_LEASE_RENEW, seq);
|
|
ceph_put_mds_session(session);
|
|
}
|
|
dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
|
|
return valid;
|
|
}
|
|
|
|
/*
|
|
* Check if directory-wide content lease/cap is valid.
|
|
*/
|
|
static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(dir);
|
|
struct ceph_dentry_info *di = ceph_dentry(dentry);
|
|
int valid = 0;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen)
|
|
valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
|
|
dir, (unsigned)atomic_read(&ci->i_shared_gen),
|
|
dentry, (unsigned)di->lease_shared_gen, valid);
|
|
return valid;
|
|
}
|
|
|
|
/*
|
|
* Check if cached dentry can be trusted.
|
|
*/
|
|
static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
|
|
{
|
|
int valid = 0;
|
|
struct dentry *parent;
|
|
struct inode *dir;
|
|
|
|
if (flags & LOOKUP_RCU) {
|
|
parent = READ_ONCE(dentry->d_parent);
|
|
dir = d_inode_rcu(parent);
|
|
if (!dir)
|
|
return -ECHILD;
|
|
} else {
|
|
parent = dget_parent(dentry);
|
|
dir = d_inode(parent);
|
|
}
|
|
|
|
dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry,
|
|
dentry, d_inode(dentry), ceph_dentry(dentry)->offset);
|
|
|
|
/* always trust cached snapped dentries, snapdir dentry */
|
|
if (ceph_snap(dir) != CEPH_NOSNAP) {
|
|
dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry,
|
|
dentry, d_inode(dentry));
|
|
valid = 1;
|
|
} else if (d_really_is_positive(dentry) &&
|
|
ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) {
|
|
valid = 1;
|
|
} else {
|
|
valid = dentry_lease_is_valid(dentry, flags, dir);
|
|
if (valid == -ECHILD)
|
|
return valid;
|
|
if (valid || dir_lease_is_valid(dir, dentry)) {
|
|
if (d_really_is_positive(dentry))
|
|
valid = ceph_is_any_caps(d_inode(dentry));
|
|
else
|
|
valid = 1;
|
|
}
|
|
}
|
|
|
|
if (!valid) {
|
|
struct ceph_mds_client *mdsc =
|
|
ceph_sb_to_client(dir->i_sb)->mdsc;
|
|
struct ceph_mds_request *req;
|
|
int op, err;
|
|
u32 mask;
|
|
|
|
if (flags & LOOKUP_RCU)
|
|
return -ECHILD;
|
|
|
|
op = ceph_snap(dir) == CEPH_SNAPDIR ?
|
|
CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
|
|
req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
|
|
if (!IS_ERR(req)) {
|
|
req->r_dentry = dget(dentry);
|
|
req->r_num_caps = 2;
|
|
req->r_parent = dir;
|
|
|
|
mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
|
|
if (ceph_security_xattr_wanted(dir))
|
|
mask |= CEPH_CAP_XATTR_SHARED;
|
|
req->r_args.getattr.mask = cpu_to_le32(mask);
|
|
|
|
err = ceph_mdsc_do_request(mdsc, NULL, req);
|
|
switch (err) {
|
|
case 0:
|
|
if (d_really_is_positive(dentry) &&
|
|
d_inode(dentry) == req->r_target_inode)
|
|
valid = 1;
|
|
break;
|
|
case -ENOENT:
|
|
if (d_really_is_negative(dentry))
|
|
valid = 1;
|
|
/* Fallthrough */
|
|
default:
|
|
break;
|
|
}
|
|
ceph_mdsc_put_request(req);
|
|
dout("d_revalidate %p lookup result=%d\n",
|
|
dentry, err);
|
|
}
|
|
}
|
|
|
|
dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
|
|
if (valid) {
|
|
ceph_dentry_lru_touch(dentry);
|
|
} else {
|
|
ceph_dir_clear_complete(dir);
|
|
}
|
|
|
|
if (!(flags & LOOKUP_RCU))
|
|
dput(parent);
|
|
return valid;
|
|
}
|
|
|
|
/*
|
|
* Release our ceph_dentry_info.
|
|
*/
|
|
static void ceph_d_release(struct dentry *dentry)
|
|
{
|
|
struct ceph_dentry_info *di = ceph_dentry(dentry);
|
|
|
|
dout("d_release %p\n", dentry);
|
|
ceph_dentry_lru_del(dentry);
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
dentry->d_fsdata = NULL;
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
if (di->lease_session)
|
|
ceph_put_mds_session(di->lease_session);
|
|
kmem_cache_free(ceph_dentry_cachep, di);
|
|
}
|
|
|
|
/*
|
|
* When the VFS prunes a dentry from the cache, we need to clear the
|
|
* complete flag on the parent directory.
|
|
*
|
|
* Called under dentry->d_lock.
|
|
*/
|
|
static void ceph_d_prune(struct dentry *dentry)
|
|
{
|
|
struct ceph_inode_info *dir_ci;
|
|
struct ceph_dentry_info *di;
|
|
|
|
dout("ceph_d_prune %pd %p\n", dentry, dentry);
|
|
|
|
/* do we have a valid parent? */
|
|
if (IS_ROOT(dentry))
|
|
return;
|
|
|
|
/* we hold d_lock, so d_parent is stable */
|
|
dir_ci = ceph_inode(d_inode(dentry->d_parent));
|
|
if (dir_ci->i_vino.snap == CEPH_SNAPDIR)
|
|
return;
|
|
|
|
/* who calls d_delete() should also disable dcache readdir */
|
|
if (d_really_is_negative(dentry))
|
|
return;
|
|
|
|
/* d_fsdata does not get cleared until d_release */
|
|
if (!d_unhashed(dentry)) {
|
|
__ceph_dir_clear_complete(dir_ci);
|
|
return;
|
|
}
|
|
|
|
/* Disable dcache readdir just in case that someone called d_drop()
|
|
* or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED
|
|
* properly (dcache readdir is still enabled) */
|
|
di = ceph_dentry(dentry);
|
|
if (di->offset > 0 &&
|
|
di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen))
|
|
__ceph_dir_clear_ordered(dir_ci);
|
|
}
|
|
|
|
/*
|
|
* read() on a dir. This weird interface hack only works if mounted
|
|
* with '-o dirstat'.
|
|
*/
|
|
static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
|
|
loff_t *ppos)
|
|
{
|
|
struct ceph_file_info *fi = file->private_data;
|
|
struct inode *inode = file_inode(file);
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int left;
|
|
const int bufsize = 1024;
|
|
|
|
if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
|
|
return -EISDIR;
|
|
|
|
if (!fi->dir_info) {
|
|
fi->dir_info = kmalloc(bufsize, GFP_KERNEL);
|
|
if (!fi->dir_info)
|
|
return -ENOMEM;
|
|
fi->dir_info_len =
|
|
snprintf(fi->dir_info, bufsize,
|
|
"entries: %20lld\n"
|
|
" files: %20lld\n"
|
|
" subdirs: %20lld\n"
|
|
"rentries: %20lld\n"
|
|
" rfiles: %20lld\n"
|
|
" rsubdirs: %20lld\n"
|
|
"rbytes: %20lld\n"
|
|
"rctime: %10ld.%09ld\n",
|
|
ci->i_files + ci->i_subdirs,
|
|
ci->i_files,
|
|
ci->i_subdirs,
|
|
ci->i_rfiles + ci->i_rsubdirs,
|
|
ci->i_rfiles,
|
|
ci->i_rsubdirs,
|
|
ci->i_rbytes,
|
|
(long)ci->i_rctime.tv_sec,
|
|
(long)ci->i_rctime.tv_nsec);
|
|
}
|
|
|
|
if (*ppos >= fi->dir_info_len)
|
|
return 0;
|
|
size = min_t(unsigned, size, fi->dir_info_len-*ppos);
|
|
left = copy_to_user(buf, fi->dir_info + *ppos, size);
|
|
if (left == size)
|
|
return -EFAULT;
|
|
*ppos += (size - left);
|
|
return size - left;
|
|
}
|
|
|
|
/*
|
|
* We maintain a private dentry LRU.
|
|
*
|
|
* FIXME: this needs to be changed to a per-mds lru to be useful.
|
|
*/
|
|
void ceph_dentry_lru_add(struct dentry *dn)
|
|
{
|
|
struct ceph_dentry_info *di = ceph_dentry(dn);
|
|
struct ceph_mds_client *mdsc;
|
|
|
|
dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn);
|
|
mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
|
|
spin_lock(&mdsc->dentry_lru_lock);
|
|
list_add_tail(&di->lru, &mdsc->dentry_lru);
|
|
mdsc->num_dentry++;
|
|
spin_unlock(&mdsc->dentry_lru_lock);
|
|
}
|
|
|
|
void ceph_dentry_lru_touch(struct dentry *dn)
|
|
{
|
|
struct ceph_dentry_info *di = ceph_dentry(dn);
|
|
struct ceph_mds_client *mdsc;
|
|
|
|
dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn,
|
|
di->offset);
|
|
mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
|
|
spin_lock(&mdsc->dentry_lru_lock);
|
|
list_move_tail(&di->lru, &mdsc->dentry_lru);
|
|
spin_unlock(&mdsc->dentry_lru_lock);
|
|
}
|
|
|
|
void ceph_dentry_lru_del(struct dentry *dn)
|
|
{
|
|
struct ceph_dentry_info *di = ceph_dentry(dn);
|
|
struct ceph_mds_client *mdsc;
|
|
|
|
dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn);
|
|
mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
|
|
spin_lock(&mdsc->dentry_lru_lock);
|
|
list_del_init(&di->lru);
|
|
mdsc->num_dentry--;
|
|
spin_unlock(&mdsc->dentry_lru_lock);
|
|
}
|
|
|
|
/*
|
|
* Return name hash for a given dentry. This is dependent on
|
|
* the parent directory's hash function.
|
|
*/
|
|
unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
|
|
{
|
|
struct ceph_inode_info *dci = ceph_inode(dir);
|
|
|
|
switch (dci->i_dir_layout.dl_dir_hash) {
|
|
case 0: /* for backward compat */
|
|
case CEPH_STR_HASH_LINUX:
|
|
return dn->d_name.hash;
|
|
|
|
default:
|
|
return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
|
|
dn->d_name.name, dn->d_name.len);
|
|
}
|
|
}
|
|
|
|
const struct file_operations ceph_dir_fops = {
|
|
.read = ceph_read_dir,
|
|
.iterate = ceph_readdir,
|
|
.llseek = ceph_dir_llseek,
|
|
.open = ceph_open,
|
|
.release = ceph_release,
|
|
.unlocked_ioctl = ceph_ioctl,
|
|
.fsync = ceph_fsync,
|
|
};
|
|
|
|
const struct file_operations ceph_snapdir_fops = {
|
|
.iterate = ceph_readdir,
|
|
.llseek = ceph_dir_llseek,
|
|
.open = ceph_open,
|
|
.release = ceph_release,
|
|
};
|
|
|
|
const struct inode_operations ceph_dir_iops = {
|
|
.lookup = ceph_lookup,
|
|
.permission = ceph_permission,
|
|
.getattr = ceph_getattr,
|
|
.setattr = ceph_setattr,
|
|
.listxattr = ceph_listxattr,
|
|
.get_acl = ceph_get_acl,
|
|
.set_acl = ceph_set_acl,
|
|
.mknod = ceph_mknod,
|
|
.symlink = ceph_symlink,
|
|
.mkdir = ceph_mkdir,
|
|
.link = ceph_link,
|
|
.unlink = ceph_unlink,
|
|
.rmdir = ceph_unlink,
|
|
.rename = ceph_rename,
|
|
.create = ceph_create,
|
|
.atomic_open = ceph_atomic_open,
|
|
};
|
|
|
|
const struct inode_operations ceph_snapdir_iops = {
|
|
.lookup = ceph_lookup,
|
|
.permission = ceph_permission,
|
|
.getattr = ceph_getattr,
|
|
.mkdir = ceph_mkdir,
|
|
.rmdir = ceph_unlink,
|
|
.rename = ceph_rename,
|
|
};
|
|
|
|
const struct dentry_operations ceph_dentry_ops = {
|
|
.d_revalidate = ceph_d_revalidate,
|
|
.d_release = ceph_d_release,
|
|
.d_prune = ceph_d_prune,
|
|
.d_init = ceph_d_init,
|
|
};
|