diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2023-10-31 05:45:40 +0100 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2023-11-25 08:34:12 +0100 |
| commit | f05441c7e16e6a720cf24e08999661a76ff77478 (patch) | |
| tree | c191a098e9b91598907f384ca4d4e99f84243f47 /fs/dcache.c | |
| parent | Call retain_dentry() with refcount 0 (diff) | |
| download | linux-f05441c7e16e6a720cf24e08999661a76ff77478.tar.xz linux-f05441c7e16e6a720cf24e08999661a76ff77478.zip | |
fold the call of retain_dentry() into fast_dput()
Calls of retain_dentry() happen immediately after getting false
from fast_dput() and getting true from retain_dentry() is
treated the same way as non-zero refcount would be treated by
fast_dput() - unlock dentry and bugger off.
Doing that in fast_dput() itself is simpler.
Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/dcache.c')
| -rw-r--r-- | fs/dcache.c | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index 8ce0fe70f303..b69ff3a0b30f 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -757,6 +757,8 @@ got_locks: * Try to do a lockless dput(), and return whether that was successful. * * If unsuccessful, we return false, having already taken the dentry lock. + * In that case refcount is guaranteed to be zero and we have already + * decided that it's not worth keeping around. * * The caller needs to hold the RCU read lock, so that the dentry is * guaranteed to stay around even if the refcount goes down to zero! @@ -842,7 +844,7 @@ static inline bool fast_dput(struct dentry *dentry) * don't need to do anything else. */ locked: - if (dentry->d_lockref.count) { + if (dentry->d_lockref.count || retain_dentry(dentry)) { spin_unlock(&dentry->d_lock); return true; } @@ -889,12 +891,6 @@ void dput(struct dentry *dentry) /* Slow case: now with the dentry lock held */ rcu_read_unlock(); - - if (likely(retain_dentry(dentry))) { - spin_unlock(&dentry->d_lock); - return; - } - dentry->d_lockref.count = 1; dentry = dentry_kill(dentry); } @@ -920,8 +916,7 @@ void dput_to_list(struct dentry *dentry, struct list_head *list) return; } rcu_read_unlock(); - if (!retain_dentry(dentry)) - to_shrink_list(dentry, list); + to_shrink_list(dentry, list); spin_unlock(&dentry->d_lock); } |