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kill DCACHE_MAY_FREE

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With the new ordering in __dentry_kill() it has become redundant -
it's set if and only if both DCACHE_DENTRY_KILLED and DCACHE_SHRINK_LIST
are set.

We set it in __dentry_kill(), after having set DCACHE_DENTRY_KILLED
with the only condition being that DCACHE_SHRINK_LIST is there;
all of that is done without dropping ->d_lock and the only place
that checks that flag (shrink_dentry_list()) does so under ->d_lock,
after having found the victim on its shrink list.  Since DCACHE_SHRINK_LIST
is set only when placing dentry into shrink list and removed only by
shrink_dentry_list() itself, a check for DCACHE_DENTRY_KILLED in
there would be equivalent to check for DCACHE_MAY_FREE.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2023-11-10 14:07:43 -05:00
parent 119dcc73a9
commit 1b327b5ac5
2 changed files with 2 additions and 5 deletions
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6
fs/dcache.c
View file

@ -614,10 +614,8 @@ static struct dentry *__dentry_kill(struct dentry *dentry)
}
spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
dentry_unlist(dentry);
if (dentry->d_flags & DCACHE_SHRINK_LIST) {
dentry->d_flags |= DCACHE_MAY_FREE;
if (dentry->d_flags & DCACHE_SHRINK_LIST)
can_free = false;
}
spin_unlock(&dentry->d_lock);
if (likely(can_free))
dentry_free(dentry);
@ -1072,7 +1070,7 @@ void shrink_dentry_list(struct list_head *list)
bool can_free;
rcu_read_unlock();
d_shrink_del(dentry);
can_free = dentry->d_flags & DCACHE_MAY_FREE;
can_free = dentry->d_flags & DCACHE_DENTRY_KILLED;
spin_unlock(&dentry->d_lock);
if (can_free)
dentry_free(dentry);

1
include/linux/dcache.h
View file

@ -202,7 +202,6 @@ struct dentry_operations {
#define DCACHE_SPECIAL_TYPE (5 << 20) /* Other file type */
#define DCACHE_SYMLINK_TYPE (6 << 20) /* Symlink */
#define DCACHE_MAY_FREE BIT(23)
#define DCACHE_NOKEY_NAME BIT(25) /* Encrypted name encoded without key */
#define DCACHE_OP_REAL BIT(26)