diff options
| author | Fabian Frederick <fabf@skynet.be> | 2017-01-18 19:39:35 +0100 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2017-01-20 12:21:41 +0100 |
| commit | 70f16cef06b5bf72d50b8016e1188995eddc073a (patch) | |
| tree | 3ce4492971a2d06aa84381634dba1593691a52ad | |
| parent | 1d82a56bc5bf820b7c65d8130b44c0bc101b546c (diff) | |
| download | linux-70f16cef06b5bf72d50b8016e1188995eddc073a.tar.bz2 | |
udf: allow implicit blocksize specification during mount
udf_fill_super() used udf_parse_options() to flag UDF_FLAG_BLOCKSIZE_SET
when blocksize was specified otherwise used 512 bytes
(bdev_logical_block_size) and 2048 bytes (UDF_DEFAULT_BLOCKSIZE)
IOW both 1024 and 4096 specifications were required or resulted in
"mount: wrong fs type, bad option, bad superblock on /dev/loop1"
This patch loops through different block values but also updates
udf_load_vrs() to return -EINVAL instead of 0 when udf_check_vsd()
fails (and uopt->novrs = 0).
The later being the reason for the RFC; we have that case when mounting
a 4kb blocksize against other values but maybe VRS is not mandatory
there ?
Tested with 512, 1024, 2048 and 4096 blocksize
Reported-by: Jan Kara <jack@suse.com>
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Jan Kara <jack@suse.cz>
| -rw-r--r-- | fs/udf/super.c | 28 |
1 files changed, 19 insertions, 9 deletions
diff --git a/fs/udf/super.c b/fs/udf/super.c index 6b5a1a45a6c1..14b4bc1f6801 100644 --- a/fs/udf/super.c +++ b/fs/udf/super.c @@ -1955,7 +1955,7 @@ static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt, if (!nsr_off) { if (!silent) udf_warn(sb, "No VRS found\n"); - return 0; + return -EINVAL; } if (nsr_off == -1) udf_debug("Failed to read sector at offset %d. " @@ -2159,15 +2159,25 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent) ret = udf_load_vrs(sb, &uopt, silent, &fileset); } else { uopt.blocksize = bdev_logical_block_size(sb->s_bdev); - ret = udf_load_vrs(sb, &uopt, silent, &fileset); - if (ret == -EAGAIN && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) { - if (!silent) - pr_notice("Rescanning with blocksize %d\n", - UDF_DEFAULT_BLOCKSIZE); - brelse(sbi->s_lvid_bh); - sbi->s_lvid_bh = NULL; - uopt.blocksize = UDF_DEFAULT_BLOCKSIZE; + while (uopt.blocksize <= 4096) { ret = udf_load_vrs(sb, &uopt, silent, &fileset); + if (ret < 0) { + if (!silent && ret != -EACCES) { + pr_notice("Scanning with blocksize %d failed\n", + uopt.blocksize); + } + brelse(sbi->s_lvid_bh); + sbi->s_lvid_bh = NULL; + /* + * EACCES is special - we want to propagate to + * upper layers that we cannot handle RW mount. + */ + if (ret == -EACCES) + break; + } else + break; + + uopt.blocksize <<= 1; } } if (ret < 0) { |