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ext4: save the error code which triggered an ext4_error() in the superblock

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This allows the cause of an ext4_error() report to be categorized
based on whether it was triggered due to an I/O error, or an memory
allocation error, or other possible causes.  Most errors are caused by
a detected file system inconsistency, so the default code stored in
the superblock will be EXT4_ERR_EFSCORRUPTED.

Link: https://lore.kernel.org/r/20191204032335.7683-1-tytso@mit.edu
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2019-11-19 21:54:15 -05:00
parent a562c687d1
commit 878520ac45
12 changed files with 128 additions and 5 deletions
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4
fs/ext4/namei.c
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@@ -156,6 +156,7 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
if (ext4_dx_csum_verify(inode, dirent))
set_buffer_verified(bh);
else {
ext4_set_errno(inode->i_sb, EFSBADCRC);
ext4_error_inode(inode, func, line, block,
"Directory index failed checksum");
brelse(bh);
@@ -166,6 +167,7 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
if (ext4_dirblock_csum_verify(inode, bh))
set_buffer_verified(bh);
else {
ext4_set_errno(inode->i_sb, EFSBADCRC);
ext4_error_inode(inode, func, line, block,
"Directory block failed checksum");
brelse(bh);
@@ -1527,6 +1529,7 @@ restart:
goto next;
wait_on_buffer(bh);
if (!buffer_uptodate(bh)) {
ext4_set_errno(sb, EIO);
EXT4_ERROR_INODE(dir, "reading directory lblock %lu",
(unsigned long) block);
brelse(bh);
@@ -1537,6 +1540,7 @@ restart:
!is_dx_internal_node(dir, block,
(struct ext4_dir_entry *)bh->b_data) &&
!ext4_dirblock_csum_verify(dir, bh)) {
ext4_set_errno(sb, EFSBADCRC);
EXT4_ERROR_INODE(dir, "checksumming directory "
"block %lu", (unsigned long)block);
brelse(bh);