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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 <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Acked-by: David Sterba <[email protected]>
Reviewed-by: Bob Peterson <[email protected]>
This commit is contained in:
Darrick J. Wong 2019-07-01 08:25:34 -07:00
commit 5aca284210
14 changed files with 144 additions and 118 deletions
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9
fs/nilfs2/ioctl.c
View file

@ -148,13 +148,8 @@ static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
oldflags = NILFS_I(inode)->i_flags;
/*
* The IMMUTABLE and APPEND_ONLY flags can only be changed by the
* relevant capability.
*/
ret = -EPERM;
if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) &&
!capable(CAP_LINUX_IMMUTABLE))
ret = vfs_ioc_setflags_prepare(inode, oldflags, flags);
if (ret)
goto out;
ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);