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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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8
fs/ext4/inode.c
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@@ -271,6 +271,7 @@ void ext4_evict_inode(struct inode *inode)
if (inode->i_blocks) {
err = ext4_truncate(inode);
if (err) {
ext4_set_errno(inode->i_sb, -err);
ext4_error(inode->i_sb,
"couldn't truncate inode %lu (err %d)",
inode->i_ino, err);
@@ -2478,10 +2479,12 @@ update_disksize:
EXT4_I(inode)->i_disksize = disksize;
up_write(&EXT4_I(inode)->i_data_sem);
err2 = ext4_mark_inode_dirty(handle, inode);
if (err2)
if (err2) {
ext4_set_errno(inode->i_sb, -err2);
ext4_error(inode->i_sb,
"Failed to mark inode %lu dirty",
inode->i_ino);
}
if (!err)
err = err2;
}
@@ -4338,6 +4341,7 @@ make_io:
blk_finish_plug(&plug);
wait_on_buffer(bh);
if (!buffer_uptodate(bh)) {
ext4_set_errno(inode->i_sb, EIO);
EXT4_ERROR_INODE_BLOCK(inode, block,
"unable to read itable block");
brelse(bh);
@@ -4552,6 +4556,7 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
}
if (!ext4_inode_csum_verify(inode, raw_inode, ei)) {
ext4_set_errno(inode->i_sb, EFSBADCRC);
ext4_error_inode(inode, function, line, 0,
"iget: checksum invalid");
ret = -EFSBADCRC;
@@ -5090,6 +5095,7 @@ int ext4_write_inode(struct inode *inode, struct writeback_control *wbc)
if (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync)
sync_dirty_buffer(iloc.bh);
if (buffer_req(iloc.bh) && !buffer_uptodate(iloc.bh)) {
ext4_set_errno(inode->i_sb, EIO);
EXT4_ERROR_INODE_BLOCK(inode, iloc.bh->b_blocknr,
"IO error syncing inode");
err = -EIO;