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vfs: create a generic checking function for FS_IOC_FSSETXATTR

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Create a generic checking function for the incoming FS_IOC_FSSETXATTR
fsxattr values so that we can standardize some of the implementation
behaviors.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Darrick J. Wong
2019-07-01 08:25:35 -07:00
parent 5aca284210
commit 7b0e492e6b
5 changed files with 98 additions and 51 deletions
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23
fs/inode.c
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@@ -2194,3 +2194,26 @@ int vfs_ioc_setflags_prepare(struct inode *inode, unsigned int oldflags,
return 0;
}
EXPORT_SYMBOL(vfs_ioc_setflags_prepare);
/*
* Generic function to check FS_IOC_FSSETXATTR 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_fssetxattr_check(struct inode *inode, const struct fsxattr *old_fa,
struct fsxattr *fa)
{
/*
* Can't modify an immutable/append-only file unless we have
* appropriate permission.
*/
if ((old_fa->fsx_xflags ^ fa->fsx_xflags) &
(FS_XFLAG_IMMUTABLE | FS_XFLAG_APPEND) &&
!capable(CAP_LINUX_IMMUTABLE))
return -EPERM;
return 0;
}
EXPORT_SYMBOL(vfs_ioc_fssetxattr_check);