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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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25
fs/ext4/ioctl.c
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@@ -721,6 +721,17 @@ static int ext4_ioctl_check_project(struct inode *inode, struct fsxattr *fa)
return 0;
}
static void ext4_fill_fsxattr(struct inode *inode, struct fsxattr *fa)
{
struct ext4_inode_info *ei = EXT4_I(inode);
simple_fill_fsxattr(fa, ext4_iflags_to_xflags(ei->i_flags &
EXT4_FL_USER_VISIBLE));
if (ext4_has_feature_project(inode->i_sb))
fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
}
long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct inode *inode = file_inode(filp);
@@ -1089,13 +1100,7 @@ resizefs_out:
{
struct fsxattr fa;
memset(&fa, 0, sizeof(struct fsxattr));
fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
if (ext4_has_feature_project(inode->i_sb)) {
fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
EXT4_I(inode)->i_projid);
}
ext4_fill_fsxattr(inode, &fa);
if (copy_to_user((struct fsxattr __user *)arg,
&fa, sizeof(fa)))
@@ -1104,7 +1109,7 @@ resizefs_out:
}
case EXT4_IOC_FSSETXATTR:
{
struct fsxattr fa;
struct fsxattr fa, old_fa;
int err;
if (copy_from_user(&fa, (struct fsxattr __user *)arg,
@@ -1127,7 +1132,11 @@ resizefs_out:
return err;
inode_lock(inode);
ext4_fill_fsxattr(inode, &old_fa);
err = ext4_ioctl_check_project(inode, &fa);
if (err)
goto out;
err = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
if (err)
goto out;
flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |