diff options
| author | David Sterba <dsterba@suse.com> | 2018-03-26 19:42:05 +0200 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2018-05-28 18:23:28 +0200 |
| commit | 19f93b3cd8c24f84e752faabf0ed9026f9377da2 (patch) | |
| tree | ecde250f843fe3f2718b4a3058117ca03efd95e3 | |
| parent | a157d4fd81dc7b7d04b6b5fc1a8e063dba2ffe5a (diff) | |
btrfs: add helpers for FS_XFLAG_* conversion
Preparatory work for the FS_IOC_FSGETXATTR ioctl, basic conversions and
checking helpers.
Signed-off-by: David Sterba <dsterba@suse.com>
| -rw-r--r-- | fs/btrfs/ioctl.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 47c1b96df099..054fa20ef193 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -338,6 +338,38 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg) return ret; } +/* + * Translate btrfs internal inode flags to xflags as expected by the + * FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are + * silently dropped. + */ +static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags) +{ + unsigned int xflags = 0; + + if (flags & BTRFS_INODE_APPEND) + xflags |= FS_XFLAG_APPEND; + if (flags & BTRFS_INODE_IMMUTABLE) + xflags |= FS_XFLAG_IMMUTABLE; + if (flags & BTRFS_INODE_NOATIME) + xflags |= FS_XFLAG_NOATIME; + if (flags & BTRFS_INODE_NODUMP) + xflags |= FS_XFLAG_NODUMP; + if (flags & BTRFS_INODE_SYNC) + xflags |= FS_XFLAG_SYNC; + + return xflags; +} + +/* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */ +static int check_xflags(unsigned int flags) +{ + if (flags & ~(FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE | FS_XFLAG_NOATIME | + FS_XFLAG_NODUMP | FS_XFLAG_SYNC)) + return -EOPNOTSUPP; + return 0; +} + static int btrfs_ioctl_getversion(struct file *file, int __user *arg) { struct inode *inode = file_inode(file); |