mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 18:30:06 +00:00
Btrfs: add support for compat flags to btrfs
This adds the necessary disk format for handling compatibility flags in the future to handle disk format changes. We have a compat_flags, compat_ro_flags and incompat_flags set for the super block. Compat flags will be to hold the features that are compatible with older versions of btrfs, compat_ro flags have features that are compatible with older versions of btrfs if the fs is mounted read only, and incompat_flags has features that are incompatible with older versions of btrfs. This also axes the compat_flags field for the inode and just makes the flags field a 64bit field, and changes the root item flags field to 64bit. Signed-off-by: Josef Bacik <jbacik@redhat.com>
This commit is contained in:
parent
7a865e8ac3
commit
f2b636e80d
2 changed files with 42 additions and 7 deletions
|
@ -305,6 +305,9 @@ struct btrfs_super_block {
|
|||
__le32 stripesize;
|
||||
__le32 sys_chunk_array_size;
|
||||
__le64 chunk_root_generation;
|
||||
__le64 compat_flags;
|
||||
__le64 compat_ro_flags;
|
||||
__le64 incompat_flags;
|
||||
u8 root_level;
|
||||
u8 chunk_root_level;
|
||||
u8 log_root_level;
|
||||
|
@ -313,6 +316,14 @@ struct btrfs_super_block {
|
|||
u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
|
||||
} __attribute__ ((__packed__));
|
||||
|
||||
/*
|
||||
* Compat flags that we support. If any incompat flags are set other than the
|
||||
* ones specified below then we will fail to mount
|
||||
*/
|
||||
#define BTRFS_FEATURE_COMPAT_SUPP 0x0
|
||||
#define BTRFS_FEATURE_COMPAT_RO_SUPP 0x0
|
||||
#define BTRFS_FEATURE_INCOMPAT_SUPP 0x0
|
||||
|
||||
/*
|
||||
* A leaf is full of items. offset and size tell us where to find
|
||||
* the item in the leaf (relative to the start of the data area)
|
||||
|
@ -433,8 +444,7 @@ struct btrfs_inode_item {
|
|||
__le32 gid;
|
||||
__le32 mode;
|
||||
__le64 rdev;
|
||||
__le16 flags;
|
||||
__le16 compat_flags;
|
||||
__le64 flags;
|
||||
|
||||
struct btrfs_timespec atime;
|
||||
struct btrfs_timespec ctime;
|
||||
|
@ -462,7 +472,7 @@ struct btrfs_root_item {
|
|||
__le64 byte_limit;
|
||||
__le64 bytes_used;
|
||||
__le64 last_snapshot;
|
||||
__le32 flags;
|
||||
__le64 flags;
|
||||
__le32 refs;
|
||||
struct btrfs_disk_key drop_progress;
|
||||
u8 drop_level;
|
||||
|
@ -1116,9 +1126,7 @@ BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
|
|||
BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
|
||||
BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
|
||||
BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
|
||||
BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
|
||||
BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
|
||||
compat_flags, 16);
|
||||
BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
|
||||
|
||||
static inline struct btrfs_timespec *
|
||||
btrfs_inode_atime(struct btrfs_inode_item *inode_item)
|
||||
|
@ -1468,7 +1476,7 @@ BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
|
|||
BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
|
||||
BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
|
||||
BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
|
||||
BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
|
||||
BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
|
||||
BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
|
||||
BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
|
||||
BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
|
||||
|
@ -1510,6 +1518,12 @@ BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
|
|||
root_dir_objectid, 64);
|
||||
BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
|
||||
num_devices, 64);
|
||||
BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
|
||||
compat_flags, 64);
|
||||
BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
|
||||
compat_flags, 64);
|
||||
BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
|
||||
incompat_flags, 64);
|
||||
|
||||
static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
|
||||
{
|
||||
|
|
|
@ -1434,6 +1434,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
|
|||
u32 blocksize;
|
||||
u32 stripesize;
|
||||
u64 generation;
|
||||
u64 features;
|
||||
struct btrfs_key location;
|
||||
struct buffer_head *bh;
|
||||
struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root),
|
||||
|
@ -1586,6 +1587,26 @@ struct btrfs_root *open_ctree(struct super_block *sb,
|
|||
goto fail_sb_buffer;
|
||||
}
|
||||
|
||||
features = btrfs_super_incompat_flags(disk_super) &
|
||||
~BTRFS_FEATURE_INCOMPAT_SUPP;
|
||||
if (features) {
|
||||
printk(KERN_ERR "BTRFS: couldn't mount because of "
|
||||
"unsupported optional features (%Lx).\n",
|
||||
features);
|
||||
err = -EINVAL;
|
||||
goto fail_sb_buffer;
|
||||
}
|
||||
|
||||
features = btrfs_super_compat_ro_flags(disk_super) &
|
||||
~BTRFS_FEATURE_COMPAT_RO_SUPP;
|
||||
if (!(sb->s_flags & MS_RDONLY) && features) {
|
||||
printk(KERN_ERR "BTRFS: couldn't mount RDWR because of "
|
||||
"unsupported option features (%Lx).\n",
|
||||
features);
|
||||
err = -EINVAL;
|
||||
goto fail_sb_buffer;
|
||||
}
|
||||
|
||||
/*
|
||||
* we need to start all the end_io workers up front because the
|
||||
* queue work function gets called at interrupt time, and so it
|
||||
|
|
Loading…
Reference in a new issue