diff options
| author | Mateusz Guzik <mguzik@redhat.com> | 2017-10-03 12:58:15 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-11-05 18:58:07 -0500 |
| commit | c02b1a9b41c2e728289f96850580a3651e0a8b5f (patch) | |
| tree | 15497a5e1c48c022858bf4f050225dd70c8d894d /Documentation/filesystems | |
| parent | 5297908270549b734c7c2556745e2385b6d4941d (diff) | |
| download | linux-c02b1a9b41c2e728289f96850580a3651e0a8b5f.tar.bz2 | |
vfs: grab the lock instead of blocking in __fd_install during resizing
Explicit locking in the fallback case provides a safe state of the
table. Getting rid of blocking semantics makes __fd_install usable
again in non-sleepable contexts, which easies backporting efforts.
There is a side effect of slightly nicer assembly for the common case
as might_sleep can now be removed.
Signed-off-by: Mateusz Guzik <mguzik@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/porting | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting index 93e0a2404532..17bb4dc28fae 100644 --- a/Documentation/filesystems/porting +++ b/Documentation/filesystems/porting @@ -502,10 +502,6 @@ in your dentry operations instead. store it as cookie. -- [mandatory] - __fd_install() & fd_install() can now sleep. Callers should not - hold a spinlock or other resources that do not allow a schedule. --- -[mandatory] any symlink that might use page_follow_link_light/page_put_link() must have inode_nohighmem(inode) called before anything might start playing with its pagecache. No highmem pages should end up in the pagecache of such |