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Btrfs: add support for compat flags to btrfs

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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:
Josef Bacik
2008-12-02 06:36:08 -05:00
committed by Chris Mason
parent 7a865e8ac3
commit f2b636e80d
2 changed files with 42 additions and 7 deletions
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21
fs/btrfs/disk-io.c
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@@ -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