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vfs: add the sb_start_intwrite_trylock() helper

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Needed by ext4 to test frozen fs before updating s_last_mounted.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein 2018-05-13 22:40:30 -04:00 committed by Theodore Ts'o
parent eee597ac93
commit 0c8e3fe35d
1 changed files with 5 additions and 0 deletions
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5
include/linux/fs.h
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@ -1597,6 +1597,11 @@ static inline void sb_start_intwrite(struct super_block *sb)
__sb_start_write(sb, SB_FREEZE_FS, true);
}
static inline int sb_start_intwrite_trylock(struct super_block *sb)
{
return __sb_start_write(sb, SB_FREEZE_FS, false);
}
extern bool inode_owner_or_capable(const struct inode *inode);