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authorMateusz Guzik <mguzik@redhat.com>2017-10-03 12:58:15 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2017-11-05 18:58:07 -0500
commitc02b1a9b41c2e728289f96850580a3651e0a8b5f (patch)
tree15497a5e1c48c022858bf4f050225dd70c8d894d /Documentation/filesystems
parent5297908270549b734c7c2556745e2385b6d4941d (diff)
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/porting4
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