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| author | Nick Piggin <npiggin@kernel.dk> | 2011-01-07 07:49:57 +0100 |
|---|---|---|
| committer | Nick Piggin <npiggin@kernel.dk> | 2011-01-07 07:50:29 +0100 |
| commit | 34286d6662308d82aed891852d04c7c3a2649b16 (patch) | |
| tree | c4b7311404d302e7cb94df7a4690298e1059910a /Documentation/filesystems/path-lookup.txt | |
| parent | fs: cache optimise dentry and inode for rcu-walk (diff) | |
| download | linux-34286d6662308d82aed891852d04c7c3a2649b16.tar.xz linux-34286d6662308d82aed891852d04c7c3a2649b16.zip | |
fs: rcu-walk aware d_revalidate method
Require filesystems be aware of .d_revalidate being called in rcu-walk
mode (nd->flags & LOOKUP_RCU). For now do a simple push down, returning
-ECHILD from all implementations.
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'Documentation/filesystems/path-lookup.txt')
| -rw-r--r-- | Documentation/filesystems/path-lookup.txt | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/Documentation/filesystems/path-lookup.txt b/Documentation/filesystems/path-lookup.txt index 09b2878724a1..8789d1810bed 100644 --- a/Documentation/filesystems/path-lookup.txt +++ b/Documentation/filesystems/path-lookup.txt @@ -317,11 +317,10 @@ The detailed design for rcu-walk is like this: The cases where rcu-walk cannot continue are: * NULL dentry (ie. any uncached path element) * parent with d_inode->i_op->permission or ACLs -* dentries with d_revalidate * Following links -In future patches, permission checks and d_revalidate become rcu-walk aware. It -may be possible eventually to make following links rcu-walk aware. +In future patches, permission checks become rcu-walk aware. It may be possible +eventually to make following links rcu-walk aware. Uncached path elements will always require dropping to ref-walk mode, at the very least because i_mutex needs to be grabbed, and objects allocated. |