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ext4: remove EA inode entry from mbcache on inode eviction 

Currently we remove EA inode from mbcache as soon as its xattr refcount
drops to zero. However there can be pending attempts to reuse the inode
and thus refcount handling code has to handle the situation when
refcount increases from zero anyway. So save some work and just keep EA
inode in mbcache until it is getting evicted. At that moment we are sure
following iget() of EA inode will fail anyway (or wait for eviction to
finish and load things from the disk again) and so removing mbcache
entry at that moment is fine and simplifies the code a bit.

CC: stable@vger.kernel.org
Fixes: 82939d7999 ("ext4: convert to mbcache2")
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20220712105436.32204-3-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara 2022-07-12 12:54:22 +02:00 committed by Theodore Ts'o
parent 3dc96bba65
commit 6bc0d63dad
3 changed files with 11 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/ext4/inode.c
View File

@ -177,6 +177,8 @@ void ext4_evict_inode(struct inode *inode)
trace_ext4_evict_inode(inode);
if (EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)
ext4_evict_ea_inode(inode);
if (inode->i_nlink) {
/*
* When journalling data dirty buffers are tracked only in the

24
fs/ext4/xattr.c
View File

@ -436,6 +436,14 @@ error:
return err;
}
/* Remove entry from mbcache when EA inode is getting evicted */
void ext4_evict_ea_inode(struct inode *inode)
{
if (EA_INODE_CACHE(inode))
mb_cache_entry_delete(EA_INODE_CACHE(inode),
ext4_xattr_inode_get_hash(inode), inode->i_ino);
}
static int
ext4_xattr_inode_verify_hashes(struct inode *ea_inode,
struct ext4_xattr_entry *entry, void *buffer,
@ -976,10 +984,8 @@ int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode,
static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode,
int ref_change)
{
struct mb_cache *ea_inode_cache = EA_INODE_CACHE(ea_inode);
struct ext4_iloc iloc;
s64 ref_count;
u32 hash;
int ret;
inode_lock(ea_inode);
@ -1002,14 +1008,6 @@ static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode,
set_nlink(ea_inode, 1);
ext4_orphan_del(handle, ea_inode);
if (ea_inode_cache) {
hash = ext4_xattr_inode_get_hash(ea_inode);
mb_cache_entry_create(ea_inode_cache,
GFP_NOFS, hash,
ea_inode->i_ino,
true /* reusable */);
}
}
} else {
WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld",
@ -1022,12 +1020,6 @@ static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode,
clear_nlink(ea_inode);
ext4_orphan_add(handle, ea_inode);
if (ea_inode_cache) {
hash = ext4_xattr_inode_get_hash(ea_inode);
mb_cache_entry_delete(ea_inode_cache, hash,
ea_inode->i_ino);
}
}
}

1
fs/ext4/xattr.h
View File

@ -191,6 +191,7 @@ extern void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *array);
extern int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
struct ext4_inode *raw_inode, handle_t *handle);
extern void ext4_evict_ea_inode(struct inode *inode);
extern const struct xattr_handler *ext4_xattr_handlers[];