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vfs: use RCU in ilookup

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[ Upstream commit 122381a469 ]

A soft lockup in ilookup was reported when stress-testing a 512-way
system [1] (see [2] for full context) and it was verified that not
taking the lock shifts issues back to mm.

[1] https://lore.kernel.org/linux-mm/56865e57-c250-44da-9713-cf1404595bcc@amd.com/
[2] https://lore.kernel.org/linux-mm/d2841226-e27b-4d3d-a578-63587a3aa4f3@amd.com/

Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://lore.kernel.org/r/20240715071324.265879-1-mjguzik@gmail.com
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mateusz Guzik 2024-07-15 09:13:24 +02:00 committed by Greg Kroah-Hartman
parent 9390b660a7
commit 27b9591896
1 changed files with 1 additions and 3 deletions
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4
fs/inode.c
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@ -1578,9 +1578,7 @@ struct inode *ilookup(struct super_block *sb, unsigned long ino)
struct hlist_head *head = inode_hashtable + hash(sb, ino);
struct inode *inode;
again:
spin_lock(&inode_hash_lock);
inode = find_inode_fast(sb, head, ino, true);
spin_unlock(&inode_hash_lock);
inode = find_inode_fast(sb, head, ino, false);
if (inode) {
if (IS_ERR(inode))