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authorLinus Torvalds <torvalds@linux-foundation.org>2018-01-31 09:25:20 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-01-31 09:25:20 -0800
commit19e7b5f99474107e8d0b4b3e4652fa19ddb87efc (patch)
tree49f15b76c07b4c90d6fbd17b49d69017c81a4b58 /fs/dcache.c
parent26064ea409b4d4acb05903a36f3fe2fdccb3d8aa (diff)
parentce4c253573ad184603e0fa77876ba155b0cde46d (diff)
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull misc vfs updates from Al Viro: "All kinds of misc stuff, without any unifying topic, from various people. Neil's d_anon patch, several bugfixes, introduction of kvmalloc analogue of kmemdup_user(), extending bitfield.h to deal with fixed-endians, assorted cleanups all over the place..." * 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (28 commits) alpha: osf_sys.c: use timespec64 where appropriate alpha: osf_sys.c: fix put_tv32 regression jffs2: Fix use-after-free bug in jffs2_iget()'s error handling path dcache: delete unused d_hash_mask dcache: subtract d_hash_shift from 32 in advance fs/buffer.c: fold init_buffer() into init_page_buffers() fs: fold __inode_permission() into inode_permission() fs: add RWF_APPEND sctp: use vmemdup_user() rather than badly open-coding memdup_user() snd_ctl_elem_init_enum_names(): switch to vmemdup_user() replace_user_tlv(): switch to vmemdup_user() new primitive: vmemdup_user() memdup_user(): switch to GFP_USER eventfd: fold eventfd_ctx_get() into eventfd_ctx_fileget() eventfd: fold eventfd_ctx_read() into eventfd_read() eventfd: convert to use anon_inode_getfd() nfs4file: get rid of pointless include of btrfs.h uvc_v4l2: clean copyin/copyout up vme_user: don't use __copy_..._user() usx2y: don't bother with memdup_user() for 16-byte structure ...
Diffstat (limited to 'fs/dcache.c')
-rw-r--r--fs/dcache.c32
1 files changed, 17 insertions, 15 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index 379dce86f001..c6d996ee2d61 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -32,7 +32,6 @@
#include <linux/swap.h>
#include <linux/bootmem.h>
#include <linux/fs_struct.h>
-#include <linux/hardirq.h>
#include <linux/bit_spinlock.h>
#include <linux/rculist_bl.h>
#include <linux/prefetch.h>
@@ -49,8 +48,8 @@
* - i_dentry, d_u.d_alias, d_inode of aliases
* dcache_hash_bucket lock protects:
* - the dcache hash table
- * s_anon bl list spinlock protects:
- * - the s_anon list (see __d_drop)
+ * s_roots bl list spinlock protects:
+ * - the s_roots list (see __d_drop)
* dentry->d_sb->s_dentry_lru_lock protects:
* - the dcache lru lists and counters
* d_lock protects:
@@ -68,7 +67,7 @@
* dentry->d_lock
* dentry->d_sb->s_dentry_lru_lock
* dcache_hash_bucket lock
- * s_anon lock
+ * s_roots lock
*
* If there is an ancestor relationship:
* dentry->d_parent->...->d_parent->d_lock
@@ -104,14 +103,13 @@ EXPORT_SYMBOL(slash_name);
* information, yet avoid using a prime hash-size or similar.
*/
-static unsigned int d_hash_mask __read_mostly;
static unsigned int d_hash_shift __read_mostly;
static struct hlist_bl_head *dentry_hashtable __read_mostly;
static inline struct hlist_bl_head *d_hash(unsigned int hash)
{
- return dentry_hashtable + (hash >> (32 - d_hash_shift));
+ return dentry_hashtable + (hash >> d_hash_shift);
}
#define IN_LOOKUP_SHIFT 10
@@ -477,10 +475,10 @@ void __d_drop(struct dentry *dentry)
/*
* Hashed dentries are normally on the dentry hashtable,
* with the exception of those newly allocated by
- * d_obtain_alias, which are always IS_ROOT:
+ * d_obtain_root, which are always IS_ROOT:
*/
if (unlikely(IS_ROOT(dentry)))
- b = &dentry->d_sb->s_anon;
+ b = &dentry->d_sb->s_roots;
else
b = d_hash(dentry->d_name.hash);
@@ -1500,8 +1498,8 @@ void shrink_dcache_for_umount(struct super_block *sb)
sb->s_root = NULL;
do_one_tree(dentry);
- while (!hlist_bl_empty(&sb->s_anon)) {
- dentry = dget(hlist_bl_entry(hlist_bl_first(&sb->s_anon), struct dentry, d_hash));
+ while (!hlist_bl_empty(&sb->s_roots)) {
+ dentry = dget(hlist_bl_entry(hlist_bl_first(&sb->s_roots), struct dentry, d_hash));
do_one_tree(dentry);
}
}
@@ -1964,9 +1962,11 @@ static struct dentry *__d_obtain_alias(struct inode *inode, int disconnected)
spin_lock(&tmp->d_lock);
__d_set_inode_and_type(tmp, inode, add_flags);
hlist_add_head(&tmp->d_u.d_alias, &inode->i_dentry);
- hlist_bl_lock(&tmp->d_sb->s_anon);
- hlist_bl_add_head(&tmp->d_hash, &tmp->d_sb->s_anon);
- hlist_bl_unlock(&tmp->d_sb->s_anon);
+ if (!disconnected) {
+ hlist_bl_lock(&tmp->d_sb->s_roots);
+ hlist_bl_add_head(&tmp->d_hash, &tmp->d_sb->s_roots);
+ hlist_bl_unlock(&tmp->d_sb->s_roots);
+ }
spin_unlock(&tmp->d_lock);
spin_unlock(&inode->i_lock);
@@ -3585,9 +3585,10 @@ static void __init dcache_init_early(void)
13,
HASH_EARLY | HASH_ZERO,
&d_hash_shift,
- &d_hash_mask,
+ NULL,
0,
0);
+ d_hash_shift = 32 - d_hash_shift;
}
static void __init dcache_init(void)
@@ -3611,9 +3612,10 @@ static void __init dcache_init(void)
13,
HASH_ZERO,
&d_hash_shift,
- &d_hash_mask,
+ NULL,
0,
0);
+ d_hash_shift = 32 - d_hash_shift;
}
/* SLAB cache for __getname() consumers */