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authorNick Piggin <npiggin@kernel.dk>2011-01-07 17:49:27 +1100
committerNick Piggin <npiggin@kernel.dk>2011-01-07 17:50:19 +1100
commit621e155a3591962420eacdd39f6f0aa29ceb221e (patch)
tree387a9fb396f1bf24514b712c294182e36ba51076 /fs/hpfs
parentfb2d5b86aff355a27ebfc132d3c99f4a940cc3fe (diff)
downloadlinux-linaro-621e155a3591962420eacdd39f6f0aa29ceb221e.tar.gz
fs: change d_compare for rcu-walk
Change d_compare so it may be called from lock-free RCU lookups. This does put significant restrictions on what may be done from the callback, however there don't seem to have been any problems with in-tree fses. If some strange use case pops up that _really_ cannot cope with the rcu-walk rules, we can just add new rcu-unaware callbacks, which would cause name lookup to drop out of rcu-walk mode. For in-tree filesystems, this is just a mechanical change. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'fs/hpfs')
-rw-r--r--fs/hpfs/dentry.c22
1 files changed, 14 insertions, 8 deletions
diff --git a/fs/hpfs/dentry.c b/fs/hpfs/dentry.c
index 67d9d36b3d5..dd9b1e74a73 100644
--- a/fs/hpfs/dentry.c
+++ b/fs/hpfs/dentry.c
@@ -34,19 +34,25 @@ static int hpfs_hash_dentry(struct dentry *dentry, struct qstr *qstr)
return 0;
}
-static int hpfs_compare_dentry(struct dentry *dentry, struct qstr *a, struct qstr *b)
+static int hpfs_compare_dentry(const struct dentry *parent,
+ const struct inode *pinode,
+ const struct dentry *dentry, const struct inode *inode,
+ unsigned int len, const char *str, const struct qstr *name)
{
- unsigned al=a->len;
- unsigned bl=b->len;
- hpfs_adjust_length(a->name, &al);
+ unsigned al = len;
+ unsigned bl = name->len;
+
+ hpfs_adjust_length(str, &al);
/*hpfs_adjust_length(b->name, &bl);*/
- /* 'a' is the qstr of an already existing dentry, so the name
- * must be valid. 'b' must be validated first.
+
+ /*
+ * 'str' is the nane of an already existing dentry, so the name
+ * must be valid. 'name' must be validated first.
*/
- if (hpfs_chk_name(b->name, &bl))
+ if (hpfs_chk_name(name->name, &bl))
return 1;
- if (hpfs_compare_names(dentry->d_sb, a->name, al, b->name, bl, 0))
+ if (hpfs_compare_names(parent->d_sb, str, al, name->name, bl, 0))
return 1;
return 0;
}