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btrfs: Sector Size check during Mount

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Gracefully fail when trying to mount a BTRFS file system that has a
sectorsize smaller than PAGE_SIZE.

On PPC it is possible to build a FS while using a 4k PAGE_SIZE kernel
then boot into a 64K PAGE_SIZE kernel.  Presently open_ctree fails in an
endless loop and hangs the machine in this situation.

My debugging has show this Sector size < Page size to be a non trivial
situation and a graceful exit from the situation would be nice for the
time being.

Signed-off-by: Keith Mannthey <kmannth@us.ibm.com>
This commit is contained in:
Keith Mannthey 2011-11-29 17:44:12 -08:00 committed by David Sterba
parent d98456fcaf
commit 941b2ddf71
1 changed files with 6 additions and 0 deletions
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6
fs/btrfs/disk-io.c
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@ -2258,6 +2258,12 @@ struct btrfs_root *open_ctree(struct super_block *sb,
goto fail_sb_buffer;
}
if (sectorsize < PAGE_SIZE) {
printk(KERN_WARNING "btrfs: Incompatible sector size "
"found on %s\n", sb->s_id);
goto fail_sb_buffer;
}
mutex_lock(&fs_info->chunk_mutex);
ret = btrfs_read_sys_array(tree_root);
mutex_unlock(&fs_info->chunk_mutex);