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| author | Nick Piggin <npiggin@kernel.dk> | 2011-01-07 07:49:38 +0100 |
|---|---|---|
| committer | Nick Piggin <npiggin@kernel.dk> | 2011-01-07 07:50:23 +0100 |
| commit | b5c84bf6f6fa3a7dfdcb556023a62953574b60ee (patch) | |
| tree | 7a2c299a180713e21d5cb653cb933121adf53c31 /Documentation/filesystems/porting | |
| parent | fs: Use rename lock and RCU for multi-step operations (diff) | |
| download | linux-b5c84bf6f6fa3a7dfdcb556023a62953574b60ee.tar.xz linux-b5c84bf6f6fa3a7dfdcb556023a62953574b60ee.zip | |
fs: dcache remove dcache_lock
dcache_lock no longer protects anything. remove it.
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'Documentation/filesystems/porting')
| -rw-r--r-- | Documentation/filesystems/porting | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting index 9fd31940a8ef..1eb76959d096 100644 --- a/Documentation/filesystems/porting +++ b/Documentation/filesystems/porting @@ -216,7 +216,6 @@ had ->revalidate()) add calls in ->follow_link()/->readlink(). ->d_parent changes are not protected by BKL anymore. Read access is safe if at least one of the following is true: * filesystem has no cross-directory rename() - * dcache_lock is held * we know that parent had been locked (e.g. we are looking at ->d_parent of ->lookup() argument). * we are called from ->rename(). @@ -340,3 +339,10 @@ look at examples of other filesystems) for guidance. .d_hash() calling convention and locking rules are significantly changed. Read updated documentation in Documentation/filesystems/vfs.txt (and look at examples of other filesystems) for guidance. + +--- +[mandatory] + dcache_lock is gone, replaced by fine grained locks. See fs/dcache.c +for details of what locks to replace dcache_lock with in order to protect +particular things. Most of the time, a filesystem only needs ->d_lock, which +protects *all* the dcache state of a given dentry. |