Messages in this thread Patch in this message | | | From | Glauber de Oliveira Costa <> | Subject | [PATCH][RESEND] ext3: Properly report backup block present in a group | Date | Thu, 16 Feb 2006 16:44:53 -0200 |
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This is a resend of a patch I sent on Jan 20th. Andrew, could you please consider applying it ?
In filesystems with the meta block group flag on, ext3_bg_num_gdb() fails to report the correct number of blocks used to store the group descriptor backups in a given group. It happens because meta_bg follows a different logic from the original ext3 backup placement in groups multiples of 3, 5 and 7.
Signed-off-by: Glauber de Oliveira Costa <glommer@br.ibm.com>
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fs/ext3/balloc.c | 33 +++++++++++++++++++++++++++++---- 1 files changed, 29 insertions(+), 4 deletions(-)
1164cfd9b1b413f6c4b86bac11006ba2b933ccb1 diff --git a/fs/ext3/balloc.c b/fs/ext3/balloc.c index 6250fcd..8bf87b0 100644 --- a/fs/ext3/balloc.c +++ b/fs/ext3/balloc.c @@ -1499,6 +1499,25 @@ int ext3_bg_has_super(struct super_block return 1; } +static unsigned long ext3_bg_num_gdb_meta(struct super_block *sb, int group) +{ + unsigned long metagroup = group / EXT3_DESC_PER_BLOCK(sb); + unsigned long first = metagroup * EXT3_DESC_PER_BLOCK(sb); + unsigned long last = first + EXT3_DESC_PER_BLOCK(sb) - 1; + + if (group == first || group == first + 1 || group == last) + return 1; + return 0; +} + +static unsigned long ext3_bg_num_gdb_nometa(struct super_block *sb, int group) +{ + if (EXT3_HAS_RO_COMPAT_FEATURE(sb,EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER)&& + !ext3_group_sparse(group)) + return 0; + return EXT3_SB(sb)->s_gdb_count; +} + /** * ext3_bg_num_gdb - number of blocks used by the group table in group * @sb: superblock for filesystem @@ -1510,9 +1529,15 @@ int ext3_bg_has_super(struct super_block */ unsigned long ext3_bg_num_gdb(struct super_block *sb, int group) { - if (EXT3_HAS_RO_COMPAT_FEATURE(sb,EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER)&& - !ext3_group_sparse(group)) - return 0; - return EXT3_SB(sb)->s_gdb_count; + unsigned long first_meta_bg = + le32_to_cpu(EXT3_SB(sb)->s_es->s_first_meta_bg); + unsigned long metagroup = group / EXT3_DESC_PER_BLOCK(sb); + + if (!EXT3_HAS_INCOMPAT_FEATURE(sb,EXT3_FEATURE_INCOMPAT_META_BG) + || metagroup < first_meta_bg) + return ext3_bg_num_gdb_nometa(sb,group); + + return ext3_bg_num_gdb_meta(sb,group); + } -- 1.0.4 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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