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authorHarshad Shirwadkar <harshadshirwadkar@gmail.com>2021-03-16 15:19:21 -0700
committerTheodore Ts'o <tytso@mit.edu>2021-03-21 00:38:18 -0400
commit8210bb29c1b66200cff7b25febcf6e39baf49fbf (patch)
tree9f3f60f830d67c9fede42c5b29b051e9f075269a
parent2a4ae3bcdf05b8639406eaa09a2939f3c6dd8e75 (diff)
downloadlinux-stericsson-8210bb29c1b66200cff7b25febcf6e39baf49fbf.tar.gz
ext4: fix rename whiteout with fast commit
This patch adds rename whiteout support in fast commits. Note that the whiteout object that gets created is actually char device. Which imples, the function ext4_inode_journal_mode(struct inode *inode) would return "JOURNAL_DATA" for this inode. This has a consequence in fast commit code that it will make creation of the whiteout object a fast-commit ineligible behavior and thus will fall back to full commits. With this patch, this can be observed by running fast commits with rename whiteout and seeing the stats generated by ext4_fc_stats tracepoint as follows: ext4_fc_stats: dev 254:32 fc ineligible reasons: XATTR:0, CROSS_RENAME:0, JOURNAL_FLAG_CHANGE:0, NO_MEM:0, SWAP_BOOT:0, RESIZE:0, RENAME_DIR:0, FALLOC_RANGE:0, INODE_JOURNAL_DATA:16; num_commits:6, ineligible: 6, numblks: 3 So in short, this patch guarantees that in case of rename whiteout, we fall back to full commits. Amir mentioned that instead of creating a new whiteout object for every rename, we can create a static whiteout object with irrelevant nlink. That will make fast commits to not fall back to full commit. But until this happens, this patch will ensure correctness by falling back to full commits. Fixes: 8016e29f4362 ("ext4: fast commit recovery path") Cc: stable@kernel.org Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20210316221921.1124955-1-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
-rw-r--r--fs/ext4/ext4.h2
-rw-r--r--fs/ext4/fast_commit.c9
-rw-r--r--fs/ext4/namei.c3
3 files changed, 12 insertions, 2 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index ea3b41579f38..826a56e3bbd2 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2794,6 +2794,8 @@ void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
struct dentry *dentry);
void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
+void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
+ struct dentry *dentry);
void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
void ext4_fc_mark_ineligible(struct super_block *sb, int reason);
diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
index 6c4f19b0a556..7541d0b5d706 100644
--- a/fs/ext4/fast_commit.c
+++ b/fs/ext4/fast_commit.c
@@ -513,10 +513,10 @@ void ext4_fc_track_link(handle_t *handle, struct dentry *dentry)
__ext4_fc_track_link(handle, d_inode(dentry), dentry);
}
-void ext4_fc_track_create(handle_t *handle, struct dentry *dentry)
+void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
+ struct dentry *dentry)
{
struct __track_dentry_update_args args;
- struct inode *inode = d_inode(dentry);
int ret;
args.dentry = dentry;
@@ -527,6 +527,11 @@ void ext4_fc_track_create(handle_t *handle, struct dentry *dentry)
trace_ext4_fc_track_create(inode, dentry, ret);
}
+void ext4_fc_track_create(handle_t *handle, struct dentry *dentry)
+{
+ __ext4_fc_track_create(handle, d_inode(dentry), dentry);
+}
+
/* __track_fn for inode tracking */
static int __track_inode(struct inode *inode, void *arg, bool update)
{
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 1fe8370dbf0b..883e2a7cd4ab 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -3873,6 +3873,7 @@ static int ext4_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
retval = ext4_mark_inode_dirty(handle, whiteout);
if (unlikely(retval))
goto end_rename;
+
}
if (!new.bh) {
retval = ext4_add_entry(handle, new.dentry, old.inode);
@@ -3946,6 +3947,8 @@ static int ext4_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
ext4_fc_track_unlink(handle, new.dentry);
__ext4_fc_track_link(handle, old.inode, new.dentry);
__ext4_fc_track_unlink(handle, old.inode, old.dentry);
+ if (whiteout)
+ __ext4_fc_track_create(handle, whiteout, old.dentry);
}
if (new.inode) {