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ceph: punch hole support
This patch implements fallocate and punch hole support for Ceph kernel client. Signed-off-by: Li Wang <liwang@ubuntukylin.com> Signed-off-by: Yunchuan Wen <yunchuanwen@ubuntukylin.com>
This commit is contained in:
Li Wang
Sage Weil
parent
3871cbb9a4
commit
ad7a60de88
196
fs/ceph/file.c
196
fs/ceph/file.c
@ -8,6 +8,7 @@
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#include <linux/namei.h>
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#include <linux/writeback.h>
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#include <linux/aio.h>
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#include <linux/falloc.h>
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#include "super.h"
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#include "mds_client.h"
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@ -874,6 +875,200 @@ out:
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return offset;
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}
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static inline void ceph_zero_partial_page(
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struct inode *inode, loff_t offset, unsigned size)
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{
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struct page *page;
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pgoff_t index = offset >> PAGE_CACHE_SHIFT;
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page = find_lock_page(inode->i_mapping, index);
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if (page) {
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wait_on_page_writeback(page);
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zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size);
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unlock_page(page);
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page_cache_release(page);
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}
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}
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static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
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loff_t length)
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{
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loff_t nearly = round_up(offset, PAGE_CACHE_SIZE);
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if (offset < nearly) {
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loff_t size = nearly - offset;
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if (length < size)
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size = length;
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ceph_zero_partial_page(inode, offset, size);
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offset += size;
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length -= size;
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}
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if (length >= PAGE_CACHE_SIZE) {
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loff_t size = round_down(length, PAGE_CACHE_SIZE);
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truncate_pagecache_range(inode, offset, offset + size - 1);
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offset += size;
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length -= size;
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}
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if (length)
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ceph_zero_partial_page(inode, offset, length);
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}
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static int ceph_zero_partial_object(struct inode *inode,
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loff_t offset, loff_t *length)
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{
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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_osd_request *req;
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int ret = 0;
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loff_t zero = 0;
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int op;
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if (!length) {
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op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
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length = &zero;
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} else {
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op = CEPH_OSD_OP_ZERO;
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}
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req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
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ceph_vino(inode),
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offset, length,
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1, op,
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CEPH_OSD_FLAG_WRITE |
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CEPH_OSD_FLAG_ONDISK,
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NULL, 0, 0, false);
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if (IS_ERR(req)) {
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ret = PTR_ERR(req);
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goto out;
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}
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ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap,
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&inode->i_mtime);
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ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
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if (!ret) {
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ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
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if (ret == -ENOENT)
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ret = 0;
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}
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ceph_osdc_put_request(req);
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out:
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return ret;
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}
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static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
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{
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int ret = 0;
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struct ceph_inode_info *ci = ceph_inode(inode);
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__s32 stripe_unit = ceph_file_layout_su(ci->i_layout);
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__s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
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__s32 object_size = ceph_file_layout_object_size(ci->i_layout);
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loff_t object_set_size = (loff_t)object_size * stripe_count;
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loff_t nearly = (offset + object_set_size - 1)
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/ object_set_size * object_set_size;
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while (length && offset < nearly) {
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loff_t size = length;
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ret = ceph_zero_partial_object(inode, offset, &size);
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if (ret < 0)
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return ret;
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offset += size;
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length -= size;
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}
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while (length >= object_set_size) {
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int i;
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loff_t pos = offset;
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for (i = 0; i < stripe_count; ++i) {
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ret = ceph_zero_partial_object(inode, pos, NULL);
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if (ret < 0)
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return ret;
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pos += stripe_unit;
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}
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offset += object_set_size;
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length -= object_set_size;
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}
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while (length) {
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loff_t size = length;
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ret = ceph_zero_partial_object(inode, offset, &size);
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if (ret < 0)
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return ret;
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offset += size;
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length -= size;
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}
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return ret;
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}
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static long ceph_fallocate(struct file *file, int mode,
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loff_t offset, loff_t length)
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{
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struct ceph_file_info *fi = file->private_data;
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struct inode *inode = file->f_dentry->d_inode;
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struct ceph_inode_info *ci = ceph_inode(inode);
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struct ceph_osd_client *osdc =
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&ceph_inode_to_client(inode)->client->osdc;
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int want, got = 0;
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int dirty;
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int ret = 0;
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loff_t endoff = 0;
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loff_t size;
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if (!S_ISREG(inode->i_mode))
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return -EOPNOTSUPP;
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if (IS_SWAPFILE(inode))
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return -ETXTBSY;
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mutex_lock(&inode->i_mutex);
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if (ceph_snap(inode) != CEPH_NOSNAP) {
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ret = -EROFS;
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goto unlock;
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}
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if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) &&
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!(mode & FALLOC_FL_PUNCH_HOLE)) {
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ret = -ENOSPC;
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goto unlock;
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}
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size = i_size_read(inode);
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if (!(mode & FALLOC_FL_KEEP_SIZE))
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endoff = offset + length;
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if (fi->fmode & CEPH_FILE_MODE_LAZY)
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want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
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else
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want = CEPH_CAP_FILE_BUFFER;
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ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff);
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if (ret < 0)
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goto unlock;
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if (mode & FALLOC_FL_PUNCH_HOLE) {
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if (offset < size)
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ceph_zero_pagecache_range(inode, offset, length);
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ret = ceph_zero_objects(inode, offset, length);
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} else if (endoff > size) {
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truncate_pagecache_range(inode, size, -1);
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if (ceph_inode_set_size(inode, endoff))
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ceph_check_caps(ceph_inode(inode),
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CHECK_CAPS_AUTHONLY, NULL);
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}
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if (!ret) {
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spin_lock(&ci->i_ceph_lock);
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dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
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spin_unlock(&ci->i_ceph_lock);
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if (dirty)
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__mark_inode_dirty(inode, dirty);
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}
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ceph_put_cap_refs(ci, got);
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unlock:
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mutex_unlock(&inode->i_mutex);
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return ret;
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}
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const struct file_operations ceph_file_fops = {
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.open = ceph_open,
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.release = ceph_release,
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@ -890,5 +1085,6 @@ const struct file_operations ceph_file_fops = {
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.splice_write = generic_file_splice_write,
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.unlocked_ioctl = ceph_ioctl,
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.compat_ioctl = ceph_ioctl,
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.fallocate = ceph_fallocate,
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};
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@ -503,7 +503,9 @@ void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
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struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
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size_t payload_len = 0;
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BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE);
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BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
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opcode != CEPH_OSD_OP_DELETE && opcode != CEPH_OSD_OP_ZERO &&
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opcode != CEPH_OSD_OP_TRUNCATE);
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op->extent.offset = offset;
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op->extent.length = length;
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@ -631,6 +633,9 @@ static u64 osd_req_encode_op(struct ceph_osd_request *req,
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break;
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case CEPH_OSD_OP_READ:
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case CEPH_OSD_OP_WRITE:
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case CEPH_OSD_OP_ZERO:
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case CEPH_OSD_OP_DELETE:
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case CEPH_OSD_OP_TRUNCATE:
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if (src->op == CEPH_OSD_OP_WRITE)
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request_data_len = src->extent.length;
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dst->extent.offset = cpu_to_le64(src->extent.offset);
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@ -715,7 +720,9 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
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u64 object_base;
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int r;
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BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE);
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BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
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opcode != CEPH_OSD_OP_DELETE && opcode != CEPH_OSD_OP_ZERO &&
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opcode != CEPH_OSD_OP_TRUNCATE);
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req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
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GFP_NOFS);
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