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vfs: create a generic checking and prep function for FS_IOC_SETFLAGS

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Create a generic function to check incoming FS_IOC_SETFLAGS flag values
and later prepare the inode for updates so that we can standardize the
implementations that follow ext4's flag values.

Note that the efivarfs implementation no longer fails a no-op SETFLAGS
without CAP_LINUX_IMMUTABLE since that's the behavior in ext*.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: David Sterba <dsterba@suse.com>
Reviewed-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Darrick J. Wong 2019-07-01 08:25:34 -07:00
parent d1fdb6d8f6
commit 5aca284210
14 changed files with 144 additions and 118 deletions
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24
fs/inode.c
View file

@ -2170,3 +2170,27 @@ struct timespec64 current_time(struct inode *inode)
return timespec64_trunc(now, inode->i_sb->s_time_gran);
}
EXPORT_SYMBOL(current_time);
/*
* Generic function to check FS_IOC_SETFLAGS values and reject any invalid
* configurations.
*
* Note: the caller should be holding i_mutex, or else be sure that they have
* exclusive access to the inode structure.
*/
int vfs_ioc_setflags_prepare(struct inode *inode, unsigned int oldflags,
unsigned int flags)
{
/*
* The IMMUTABLE and APPEND_ONLY flags can only be changed by
* the relevant capability.
*
* This test looks nicer. Thanks to Pauline Middelink
*/
if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL) &&
!capable(CAP_LINUX_IMMUTABLE))
return -EPERM;
return 0;
}
EXPORT_SYMBOL(vfs_ioc_setflags_prepare);