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authorDave Young <hidave.darkstar@gmail.com>2011-01-08 10:09:13 +0000
committerChris Mason <chris.mason@oracle.com>2011-01-16 11:30:19 -0500
commit20b450773d17e325190c158e10bfdb25dc21d2d6 (patch)
treec99c3d8cedbf8fb5f01ed42d7d3c5b5bd5fd9d69 /fs
parent42838bb265b9cff3de9587fcacc398b5112dc2d9 (diff)
downloadop-kernel-dev-20b450773d17e325190c158e10bfdb25dc21d2d6.zip
op-kernel-dev-20b450773d17e325190c158e10bfdb25dc21d2d6.tar.gz
btrfs: mount failure return value fix
I happened to pass swap partition as root partition in cmdline, then kernel panic and tell me about "Cannot open root device". It is not correct, in fact it is a fs type mismatch instead of 'no device'. Eventually I found btrfs mounting failed with -EIO, it should be -EINVAL. The logic in init/do_mounts.c: for (p = fs_names; *p; p += strlen(p)+1) { int err = do_mount_root(name, p, flags, root_mount_data); switch (err) { case 0: goto out; case -EACCES: flags |= MS_RDONLY; goto retry; case -EINVAL: continue; } print "Cannot open root device" panic } SO fs type after btrfs will have no chance to mount Here fix the return value as -EINVAL Signed-off-by: Dave Young <hidave.darkstar@gmail.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/disk-io.c4
-rw-r--r--fs/btrfs/volumes.c8
2 files changed, 8 insertions, 4 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index f88eb2c..f9efb68 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1713,8 +1713,10 @@ struct btrfs_root *open_ctree(struct super_block *sb,
fs_info, BTRFS_ROOT_TREE_OBJECTID);
bh = btrfs_read_dev_super(fs_devices->latest_bdev);
- if (!bh)
+ if (!bh) {
+ err = -EINVAL;
goto fail_iput;
+ }
memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy));
memcpy(&fs_info->super_for_commit, &fs_info->super_copy,
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 0c7f478..e8be478 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -600,8 +600,10 @@ static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
set_blocksize(bdev, 4096);
bh = btrfs_read_dev_super(bdev);
- if (!bh)
+ if (!bh) {
+ ret = -EINVAL;
goto error_close;
+ }
disk_super = (struct btrfs_super_block *)bh->b_data;
devid = btrfs_stack_device_id(&disk_super->dev_item);
@@ -702,7 +704,7 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
goto error_close;
bh = btrfs_read_dev_super(bdev);
if (!bh) {
- ret = -EIO;
+ ret = -EINVAL;
goto error_close;
}
disk_super = (struct btrfs_super_block *)bh->b_data;
@@ -1302,7 +1304,7 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
set_blocksize(bdev, 4096);
bh = btrfs_read_dev_super(bdev);
if (!bh) {
- ret = -EIO;
+ ret = -EINVAL;
goto error_close;
}
disk_super = (struct btrfs_super_block *)bh->b_data;
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