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authorNick Piggin <npiggin@kernel.dk>2011-01-07 01:49:27 -0500
committerNick Piggin <npiggin@kernel.dk>2011-01-07 01:50:19 -0500
commit621e155a3591962420eacdd39f6f0aa29ceb221e (patch)
tree387a9fb396f1bf24514b712c294182e36ba51076 /Documentation/filesystems/Locking
parentfb2d5b86aff355a27ebfc132d3c99f4a940cc3fe (diff)
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 'Documentation/filesystems/Locking')
-rw-r--r--Documentation/filesystems/Locking4
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index 33fa3e5d38fd..9a76f8d8bf95 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -11,7 +11,9 @@ be able to use diff(1).
11prototypes: 11prototypes:
12 int (*d_revalidate)(struct dentry *, int); 12 int (*d_revalidate)(struct dentry *, int);
13 int (*d_hash) (struct dentry *, struct qstr *); 13 int (*d_hash) (struct dentry *, struct qstr *);
14 int (*d_compare) (struct dentry *, struct qstr *, struct qstr *); 14 int (*d_compare)(const struct dentry *, const struct inode *,
15 const struct dentry *, const struct inode *,
16 unsigned int, const char *, const struct qstr *);
15 int (*d_delete)(struct dentry *); 17 int (*d_delete)(struct dentry *);
16 void (*d_release)(struct dentry *); 18 void (*d_release)(struct dentry *);
17 void (*d_iput)(struct dentry *, struct inode *); 19 void (*d_iput)(struct dentry *, struct inode *);