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authorLinus Torvalds <torvalds@linux-foundation.org>2016-08-07 10:01:14 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-07 10:01:14 -0400
commitfe64f3283fb315e3d8f2b78785a86904a852ca82 (patch)
tree3ab48823f0ef8b855f9b58809f09b9db2997f12e /fs/dcache.c
parent0cbbc422d56668528f6efd1234fe908010284082 (diff)
parentdb20a8925bc420eed033c5d91ff6afa74465e521 (diff)
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Merge branch 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull more vfs updates from Al Viro: "Assorted cleanups and fixes. In the "trivial API change" department - ->d_compare() losing 'parent' argument" * 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: cachefiles: Fix race between inactivating and culling a cache object 9p: use clone_fid() 9p: fix braino introduced in "9p: new helper - v9fs_parent_fid()" vfs: make dentry_needs_remove_privs() internal vfs: remove file_needs_remove_privs() vfs: fix deadlock in file_remove_privs() on overlayfs get rid of 'parent' argument of ->d_compare() cifs, msdos, vfat, hfs+: don't bother with parent in ->d_compare() affs ->d_compare(): don't bother with ->d_inode fold _d_rehash() and __d_rehash() together fold dentry_rcuwalk_invalidate() into its only remaining caller
Diffstat (limited to 'fs/dcache.c')
-rw-r--r--fs/dcache.c55
1 files changed, 15 insertions, 40 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index 96635a30fb26..5c7cc953ac81 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -316,20 +316,6 @@ static void dentry_free(struct dentry *dentry)
call_rcu(&dentry->d_u.d_rcu, __d_free);
}
-/**
- * dentry_rcuwalk_invalidate - invalidate in-progress rcu-walk lookups
- * @dentry: the target dentry
- * After this call, in-progress rcu-walk path lookup will fail. This
- * should be called after unhashing, and after changing d_inode (if
- * the dentry has not already been unhashed).
- */
-static inline void dentry_rcuwalk_invalidate(struct dentry *dentry)
-{
- lockdep_assert_held(&dentry->d_lock);
- /* Go through am invalidation barrier */
- write_seqcount_invalidate(&dentry->d_seq);
-}
-
/*
* Release the dentry's inode, using the filesystem
* d_iput() operation if defined.
@@ -468,7 +454,8 @@ void __d_drop(struct dentry *dentry)
__hlist_bl_del(&dentry->d_hash);
dentry->d_hash.pprev = NULL;
hlist_bl_unlock(b);
- dentry_rcuwalk_invalidate(dentry);
+ /* After this call, in-progress rcu-walk path lookup will fail. */
+ write_seqcount_invalidate(&dentry->d_seq);
}
}
EXPORT_SYMBOL(__d_drop);
@@ -2060,7 +2047,7 @@ static inline bool d_same_name(const struct dentry *dentry,
return false;
return dentry_cmp(dentry, name->name, name->len) == 0;
}
- return parent->d_op->d_compare(parent, dentry,
+ return parent->d_op->d_compare(dentry,
dentry->d_name.len, dentry->d_name.name,
name) == 0;
}
@@ -2163,7 +2150,7 @@ seqretry:
cpu_relax();
goto seqretry;
}
- if (parent->d_op->d_compare(parent, dentry,
+ if (parent->d_op->d_compare(dentry,
tlen, tname, name) != 0)
continue;
} else {
@@ -2352,19 +2339,15 @@ again:
}
EXPORT_SYMBOL(d_delete);
-static void __d_rehash(struct dentry * entry, struct hlist_bl_head *b)
+static void __d_rehash(struct dentry *entry)
{
+ struct hlist_bl_head *b = d_hash(entry->d_name.hash);
BUG_ON(!d_unhashed(entry));
hlist_bl_lock(b);
hlist_bl_add_head_rcu(&entry->d_hash, b);
hlist_bl_unlock(b);
}
-static void _d_rehash(struct dentry * entry)
-{
- __d_rehash(entry, d_hash(entry->d_name.hash));
-}
-
/**
* d_rehash - add an entry back to the hash
* @entry: dentry to add to the hash
@@ -2375,7 +2358,7 @@ static void _d_rehash(struct dentry * entry)
void d_rehash(struct dentry * entry)
{
spin_lock(&entry->d_lock);
- _d_rehash(entry);
+ __d_rehash(entry);
spin_unlock(&entry->d_lock);
}
EXPORT_SYMBOL(d_rehash);
@@ -2549,7 +2532,7 @@ static inline void __d_add(struct dentry *dentry, struct inode *inode)
raw_write_seqcount_end(&dentry->d_seq);
fsnotify_update_flags(dentry);
}
- _d_rehash(dentry);
+ __d_rehash(dentry);
if (dir)
end_dir_add(dir, n);
spin_unlock(&dentry->d_lock);
@@ -2611,7 +2594,7 @@ struct dentry *d_exact_alias(struct dentry *entry, struct inode *inode)
alias = NULL;
} else {
__dget_dlock(alias);
- _d_rehash(alias);
+ __d_rehash(alias);
spin_unlock(&alias->d_lock);
}
spin_unlock(&inode->i_lock);
@@ -2795,23 +2778,10 @@ static void __d_move(struct dentry *dentry, struct dentry *target,
write_seqcount_begin(&dentry->d_seq);
write_seqcount_begin_nested(&target->d_seq, DENTRY_D_LOCK_NESTED);
+ /* unhash both */
/* __d_drop does write_seqcount_barrier, but they're OK to nest. */
-
- /*
- * Move the dentry to the target hash queue. Don't bother checking
- * for the same hash queue because of how unlikely it is.
- */
__d_drop(dentry);
- __d_rehash(dentry, d_hash(target->d_name.hash));
-
- /*
- * Unhash the target (d_delete() is not usable here). If exchanging
- * the two dentries, then rehash onto the other's hash queue.
- */
__d_drop(target);
- if (exchange) {
- __d_rehash(target, d_hash(dentry->d_name.hash));
- }
/* Switch the names.. */
if (exchange)
@@ -2819,6 +2789,11 @@ static void __d_move(struct dentry *dentry, struct dentry *target,
else
copy_name(dentry, target);
+ /* rehash in new place(s) */
+ __d_rehash(dentry);
+ if (exchange)
+ __d_rehash(target);
+
/* ... and switch them in the tree */
if (IS_ROOT(dentry)) {
/* splicing a tree */