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ext4: only check dquot_initialize_needed() when debugging 

ext4_xattr_block_set() relies on its caller to call dquot_initialize()
on the inode.  To assure that this has happened there are WARN_ON
checks.  Unfortunately, this is subject to false positives if there is
an antagonist thread which is flipping the file system at high rates
between r/o and rw.  So only do the check if EXT4_XATTR_DEBUG is
enabled.

Link: https://lore.kernel.org/r/20230608044056.GA1418535@mit.edu
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2023-06-08 10:06:40 -04:00
parent 1b29243933
commit dea9d8f764
1 changed files with 4 additions and 2 deletions
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6
fs/ext4/xattr.c
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@ -2056,8 +2056,9 @@ ext4_xattr_block_set(handle_t *handle, struct inode *inode,
else { else {
u32 ref; u32 ref;
#ifdef EXT4_XATTR_DEBUG
WARN_ON_ONCE(dquot_initialize_needed(inode)); WARN_ON_ONCE(dquot_initialize_needed(inode));
#endif
/* The old block is released after updating /* The old block is released after updating
the inode. */ the inode. */
error = dquot_alloc_block(inode, error = dquot_alloc_block(inode,
@ -2120,8 +2121,9 @@ ext4_xattr_block_set(handle_t *handle, struct inode *inode,
/* We need to allocate a new block */ /* We need to allocate a new block */
ext4_fsblk_t goal, block; ext4_fsblk_t goal, block;
#ifdef EXT4_XATTR_DEBUG
WARN_ON_ONCE(dquot_initialize_needed(inode)); WARN_ON_ONCE(dquot_initialize_needed(inode));
#endif
goal = ext4_group_first_block_no(sb, goal = ext4_group_first_block_no(sb,
EXT4_I(inode)->i_block_group); EXT4_I(inode)->i_block_group);
block = ext4_new_meta_blocks(handle, inode, goal, 0, block = ext4_new_meta_blocks(handle, inode, goal, 0,