summaryrefslogtreecommitdiffstats
path: root/fs
diff options
context:
space:
mode:
authorRyusuke Konishi <konishi.ryusuke@gmail.com>2024-08-14 12:11:19 +0200
committerAndrew Morton <akpm@linux-foundation.org>2024-09-02 02:59:00 +0200
commit6576dd6695f2afca3f4954029ac4a64f82ba60ab (patch)
tree5dddbf90705bed6f77257bf9097a42de0f8888ca /fs
parentnilfs2: fix missing cleanup on rollforward recovery error (diff)
downloadlinux-6576dd6695f2afca3f4954029ac4a64f82ba60ab.tar.xz
linux-6576dd6695f2afca3f4954029ac4a64f82ba60ab.zip
nilfs2: fix state management in error path of log writing function
After commit a694291a6211 ("nilfs2: separate wait function from nilfs_segctor_write") was applied, the log writing function nilfs_segctor_do_construct() was able to issue I/O requests continuously even if user data blocks were split into multiple logs across segments, but two potential flaws were introduced in its error handling. First, if nilfs_segctor_begin_construction() fails while creating the second or subsequent logs, the log writing function returns without calling nilfs_segctor_abort_construction(), so the writeback flag set on pages/folios will remain uncleared. This causes page cache operations to hang waiting for the writeback flag. For example, truncate_inode_pages_final(), which is called via nilfs_evict_inode() when an inode is evicted from memory, will hang. Second, the NILFS_I_COLLECTED flag set on normal inodes remain uncleared. As a result, if the next log write involves checkpoint creation, that's fine, but if a partial log write is performed that does not, inodes with NILFS_I_COLLECTED set are erroneously removed from the "sc_dirty_files" list, and their data and b-tree blocks may not be written to the device, corrupting the block mapping. Fix these issues by uniformly calling nilfs_segctor_abort_construction() on failure of each step in the loop in nilfs_segctor_do_construct(), having it clean up logs and segment usages according to progress, and correcting the conditions for calling nilfs_redirty_inodes() to ensure that the NILFS_I_COLLECTED flag is cleared. Link: https://lkml.kernel.org/r/20240814101119.4070-1-konishi.ryusuke@gmail.com Fixes: a694291a6211 ("nilfs2: separate wait function from nilfs_segctor_write") Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com> Tested-by: Ryusuke Konishi <konishi.ryusuke@gmail.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to '')
-rw-r--r--fs/nilfs2/segment.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 0ca3110d6386..871ec35ea8e8 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -1812,6 +1812,9 @@ static void nilfs_segctor_abort_construction(struct nilfs_sc_info *sci,
nilfs_abort_logs(&logs, ret ? : err);
list_splice_tail_init(&sci->sc_segbufs, &logs);
+ if (list_empty(&logs))
+ return; /* if the first segment buffer preparation failed */
+
nilfs_cancel_segusage(&logs, nilfs->ns_sufile);
nilfs_free_incomplete_logs(&logs, nilfs);
@@ -2056,7 +2059,7 @@ static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
err = nilfs_segctor_begin_construction(sci, nilfs);
if (unlikely(err))
- goto out;
+ goto failed;
/* Update time stamp */
sci->sc_seg_ctime = ktime_get_real_seconds();
@@ -2120,10 +2123,9 @@ static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
return err;
failed_to_write:
- if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
- nilfs_redirty_inodes(&sci->sc_dirty_files);
-
failed:
+ if (mode == SC_LSEG_SR && nilfs_sc_cstage_get(sci) >= NILFS_ST_IFILE)
+ nilfs_redirty_inodes(&sci->sc_dirty_files);
if (nilfs_doing_gc())
nilfs_redirty_inodes(&sci->sc_gc_inodes);
nilfs_segctor_abort_construction(sci, nilfs, err);