Before any data write, convert inline data to normal data and set
i_inline_version to CEPH_INLINE_NONE. The OSD request that saves
inline data to object contains 3 operations (CMPXATTR, WRITE and
SETXATTR). It compares a xattr named 'inline_version' to prevent
old data overwrites newer data.
Signed-off-by: Yan, Zheng <zyan@xxxxxxxxxx>
---
fs/ceph/addr.c | 136 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/ceph/file.c | 14 ++++++
fs/ceph/super.h | 2 +-
3 files changed, 151 insertions(+), 1 deletion(-)
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 9dcb4a9..72336bd 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -1262,6 +1262,19 @@ static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
size_t len;
int want, got, ret;
+ if (ci->i_inline_version != CEPH_INLINE_NONE) {
+ struct page *locked_page = NULL;
+ if (off == 0) {
+ lock_page(page);
+ locked_page = page;
+ }
+ ret = ceph_uninline_data(vma->vm_file, locked_page);
+ if (locked_page)
+ unlock_page(locked_page);
+ if (ret < 0)
+ return VM_FAULT_SIGBUS;
+ }
+
if (off + PAGE_CACHE_SIZE <= size)
len = PAGE_CACHE_SIZE;
else
@@ -1315,6 +1328,7 @@ out:
} else {
int dirty;
spin_lock(&ci->i_ceph_lock);
+ ci->i_inline_version = CEPH_INLINE_NONE;
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
spin_unlock(&ci->i_ceph_lock);
if (dirty)
@@ -1370,6 +1384,128 @@ void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
}
}
+int ceph_uninline_data(struct file *filp, struct page *locked_page)
+{
+ struct inode *inode = file_inode(filp);
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
+ struct ceph_osd_request *req;
+ struct page *page = NULL;
+ u64 len, inline_version;
+ int err = 0;
+ bool from_pagecache = false;
+
+ spin_lock(&ci->i_ceph_lock);
+ inline_version = ci->i_inline_version;
+ spin_unlock(&ci->i_ceph_lock);
+
+ dout("uninline_data %p %llx.%llx inline_version %llu\n",
+ inode, ceph_vinop(inode), inline_version);
+
+ if (inline_version == 1 || /* initial version, no data */
+ inline_version == CEPH_INLINE_NONE)
+ goto out;
+
+ if (locked_page) {
+ page = locked_page;
+ WARN_ON(!PageUptodate(page));
+ } else if (ceph_caps_issued(ci) &
+ (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) {
+ page = find_get_page(inode->i_mapping, 0);
+ if (page) {
+ if (PageUptodate(page)) {
+ from_pagecache = true;
+ lock_page(page);
+ } else {
+ page_cache_release(page);
+ page = NULL;
+ }
+ }
+ }
+
+ if (page) {
+ len = i_size_read(inode);
+ if (len > PAGE_CACHE_SIZE)
+ len = PAGE_CACHE_SIZE;
+ } else {
+ page = __page_cache_alloc(GFP_NOFS);
+ if (!page) {
+ err = -ENOMEM;
+ goto out;
+ }
+ err = __ceph_do_getattr(inode, page,
+ CEPH_STAT_CAP_INLINE_DATA, true);
+ if (err < 0) {
+ /* no inline data */
+ if (err == -ENODATA)
+ err = 0;
+ goto out;
+ }
+ len = err;
+ }
+
+ req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
+ ceph_vino(inode), 0, &len, 0, 1,
+ CEPH_OSD_OP_CREATE,
+ CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
+ ci->i_snap_realm->cached_context,
+ 0, 0, false);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto out;
+ }
+
+ ceph_osdc_build_request(req, 0, NULL, CEPH_NOSNAP, &inode->i_mtime);
+ err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
+ if (!err)
+ err = ceph_osdc_wait_request(&fsc->client->osdc, req);
+ ceph_osdc_put_request(req);
+ if (err < 0)
+ goto out;
+
+ req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
+ ceph_vino(inode), 0, &len, 1, 3,
+ CEPH_OSD_OP_WRITE,
+ CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE,
+ ci->i_snap_realm->cached_context,
+ ci->i_truncate_seq, ci->i_truncate_size,
+ false);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto out;
+ }
+
+ osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false);
+
+ osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, "inline_version",
+ &inline_version, sizeof(inline_version),
+ CEPH_OSD_CMPXATTR_OP_GT,
+ CEPH_OSD_CMPXATTR_MODE_U64);
+
+ osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, "inline_version",
+ &inline_version, sizeof(inline_version), 0, 0);
+
+ ceph_osdc_build_request(req, 0, NULL, CEPH_NOSNAP, &inode->i_mtime);
+ err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
+ if (!err)
+ err = ceph_osdc_wait_request(&fsc->client->osdc, req);
+ ceph_osdc_put_request(req);
+ if (err == -ECANCELED)
+ err = 0;
+out:
+ if (page && page != locked_page) {
+ if (from_pagecache) {
+ unlock_page(page);
+ page_cache_release(page);
+ } else
+ __free_pages(page, 0);
+ }
+
+ dout("uninline_data %p %llx.%llx inline_version %llu = %d\n",
+ inode, ceph_vinop(inode), inline_version, err);
+ return err;
+}
+
static struct vm_operations_struct ceph_vmops = {
.fault = ceph_filemap_fault,
.page_mkwrite = ceph_page_mkwrite,
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 5b092bd..9b5901f 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -963,6 +963,12 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (err)
goto out;
+ if (ci->i_inline_version != CEPH_INLINE_NONE) {
+ err = ceph_uninline_data(file, NULL);
+ if (err < 0)
+ goto out;
+ }
+
retry_snap:
if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) {
err = -ENOSPC;
@@ -1024,6 +1030,7 @@ retry_snap:
if (written >= 0) {
int dirty;
spin_lock(&ci->i_ceph_lock);
+ ci->i_inline_version = CEPH_INLINE_NONE;
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
spin_unlock(&ci->i_ceph_lock);
if (dirty)
@@ -1269,6 +1276,12 @@ static long ceph_fallocate(struct file *file, int mode,
goto unlock;
}
+ if (ci->i_inline_version != CEPH_INLINE_NONE) {
+ ret = ceph_uninline_data(file, NULL);
+ if (ret < 0)
+ goto unlock;
+ }
+
size = i_size_read(inode);
if (!(mode & FALLOC_FL_KEEP_SIZE))
endoff = offset + length;
@@ -1295,6 +1308,7 @@ static long ceph_fallocate(struct file *file, int mode,
if (!ret) {
spin_lock(&ci->i_ceph_lock);
+ ci->i_inline_version = CEPH_INLINE_NONE;
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
spin_unlock(&ci->i_ceph_lock);
if (dirty)
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 90f79b5..02de104 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -888,7 +888,7 @@ extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
extern int ceph_release(struct inode *inode, struct file *filp);
extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
char *data, size_t len);
-
+int ceph_uninline_data(struct file *filp, struct page *locked_page);
/* dir.c */
extern const struct file_operations ceph_dir_fops;
extern const struct inode_operations ceph_dir_iops;
--
1.9.3
--
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