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ext2: factor our freeing of xattr block reference

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Free of xattr block reference is opencode in two places. Factor it out
into a separate function and use it.

Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20220712105436.32204-6-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara 2022-07-12 12:54:25 +02:00 committed by Theodore Ts'o
parent 65f8b80053
commit 90ae40d243
1 changed files with 38 additions and 52 deletions
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90
fs/ext2/xattr.c
View file

@ -651,6 +651,42 @@ ext2_xattr_set(struct inode *inode, int name_index, const char *name,
return error;
}
static void ext2_xattr_release_block(struct inode *inode,
struct buffer_head *bh)
{
struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode);
lock_buffer(bh);
if (HDR(bh)->h_refcount == cpu_to_le32(1)) {
__u32 hash = le32_to_cpu(HDR(bh)->h_hash);
/*
* This must happen under buffer lock for
* ext2_xattr_set2() to reliably detect freed block
*/
mb_cache_entry_delete(ea_block_cache, hash,
bh->b_blocknr);
/* Free the old block. */
ea_bdebug(bh, "freeing");
ext2_free_blocks(inode, bh->b_blocknr, 1);
/* We let our caller release bh, so we
* need to duplicate the buffer before. */
get_bh(bh);
bforget(bh);
unlock_buffer(bh);
} else {
/* Decrement the refcount only. */
le32_add_cpu(&HDR(bh)->h_refcount, -1);
dquot_free_block(inode, 1);
mark_buffer_dirty(bh);
unlock_buffer(bh);
ea_bdebug(bh, "refcount now=%d",
le32_to_cpu(HDR(bh)->h_refcount));
if (IS_SYNC(inode))
sync_dirty_buffer(bh);
}
}
/*
* Second half of ext2_xattr_set(): Update the file system.
*/
@ -747,34 +783,7 @@ ext2_xattr_set2(struct inode *inode, struct buffer_head *old_bh,
* If there was an old block and we are no longer using it,
* release the old block.
*/
lock_buffer(old_bh);
if (HDR(old_bh)->h_refcount == cpu_to_le32(1)) {
__u32 hash = le32_to_cpu(HDR(old_bh)->h_hash);
/*
* This must happen under buffer lock for
* ext2_xattr_set2() to reliably detect freed block
*/
mb_cache_entry_delete(ea_block_cache, hash,
old_bh->b_blocknr);
/* Free the old block. */
ea_bdebug(old_bh, "freeing");
ext2_free_blocks(inode, old_bh->b_blocknr, 1);
mark_inode_dirty(inode);
/* We let our caller release old_bh, so we
* need to duplicate the buffer before. */
get_bh(old_bh);
bforget(old_bh);
} else {
/* Decrement the refcount only. */
le32_add_cpu(&HDR(old_bh)->h_refcount, -1);
dquot_free_block_nodirty(inode, 1);
mark_inode_dirty(inode);
mark_buffer_dirty(old_bh);
ea_bdebug(old_bh, "refcount now=%d",
le32_to_cpu(HDR(old_bh)->h_refcount));
}
unlock_buffer(old_bh);
ext2_xattr_release_block(inode, old_bh);
}
cleanup:
@ -828,30 +837,7 @@ ext2_xattr_delete_inode(struct inode *inode)
EXT2_I(inode)->i_file_acl);
goto cleanup;
}
lock_buffer(bh);
if (HDR(bh)->h_refcount == cpu_to_le32(1)) {
__u32 hash = le32_to_cpu(HDR(bh)->h_hash);
/*
* This must happen under buffer lock for ext2_xattr_set2() to
* reliably detect freed block
*/
mb_cache_entry_delete(EA_BLOCK_CACHE(inode), hash,
bh->b_blocknr);
ext2_free_blocks(inode, EXT2_I(inode)->i_file_acl, 1);
get_bh(bh);
bforget(bh);
unlock_buffer(bh);
} else {
le32_add_cpu(&HDR(bh)->h_refcount, -1);
ea_bdebug(bh, "refcount now=%d",
le32_to_cpu(HDR(bh)->h_refcount));
unlock_buffer(bh);
mark_buffer_dirty(bh);
if (IS_SYNC(inode))
sync_dirty_buffer(bh);
dquot_free_block_nodirty(inode, 1);
}
ext2_xattr_release_block(inode, bh);
EXT2_I(inode)->i_file_acl = 0;
cleanup: