From 92fc03fbdcbe2523be3f7e6b8e95fee9563a10d2 Mon Sep 17 00:00:00 2001 From: Anand Jain Date: Fri, 14 Aug 2015 18:32:51 +0800 Subject: Btrfs: SB read failure should return EIO for __bread failure This will return EIO when __bread() fails to read SB, instead of EINVAL. Signed-off-by: Anand Jain Signed-off-by: David Sterba --- fs/btrfs/disk-io.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) (limited to 'fs/btrfs/disk-io.c') diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 76734732eca6..357d9f9c9968 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -2653,8 +2653,8 @@ int open_ctree(struct super_block *sb, * Read super block and check the signature bytes only */ bh = btrfs_read_dev_super(fs_devices->latest_bdev); - if (!bh) { - err = -EINVAL; + if (IS_ERR(bh)) { + err = PTR_ERR(bh); goto fail_alloc; } @@ -3196,6 +3196,7 @@ struct buffer_head *btrfs_read_dev_super(struct block_device *bdev) int i; u64 transid = 0; u64 bytenr; + int ret = -EINVAL; /* we would like to check all the supers, but that would make * a btrfs mount succeed after a mkfs from a different FS. @@ -3209,13 +3210,20 @@ struct buffer_head *btrfs_read_dev_super(struct block_device *bdev) break; bh = __bread(bdev, bytenr / 4096, BTRFS_SUPER_INFO_SIZE); - if (!bh) + /* + * If we fail to read from the underlying devices, as of now + * the best option we have is to mark it EIO. + */ + if (!bh) { + ret = -EIO; continue; + } super = (struct btrfs_super_block *)bh->b_data; if (btrfs_super_bytenr(super) != bytenr || btrfs_super_magic(super) != BTRFS_MAGIC) { brelse(bh); + ret = -EINVAL; continue; } @@ -3227,6 +3235,10 @@ struct buffer_head *btrfs_read_dev_super(struct block_device *bdev) brelse(bh); } } + + if (!latest) + return ERR_PTR(ret); + return latest; } -- cgit v1.2.3