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vfs: only allow FSSETXATTR to set DAX flag on files and dirs

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The DAX flag only applies to files and directories, so don't let it get
set for other types of files.

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 08:25:36 -07:00
parent ca29be7534
commit dbc77f31e5
1 changed files with 8 additions and 0 deletions
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8
fs/inode.c
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@ -2239,6 +2239,14 @@ int vfs_ioc_fssetxattr_check(struct inode *inode, const struct fsxattr *old_fa,
!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
return -EINVAL;
/*
* It is only valid to set the DAX flag on regular files and
* directories on filesystems.
*/
if ((fa->fsx_xflags & FS_XFLAG_DAX) &&
!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
return -EINVAL;
/* Extent size hints of zero turn off the flags. */
if (fa->fsx_extsize == 0)
fa->fsx_xflags &= ~(FS_XFLAG_EXTSIZE | FS_XFLAG_EXTSZINHERIT);