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vfs: grab the lock instead of blocking in __fd_install during resizing

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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 <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Mateusz Guzik 2017-10-03 12:58:15 +02:00 • committed by Al Viro
commit c02b1a9b41
2 changed files with 7 additions and 8 deletions
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4
Documentation/filesystems/porting
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@ -501,10 +501,6 @@ in your dentry operations instead.
is non-NULL. Note that link body isn't available anymore, so if you need it,
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