ext3 in the 2.5.46 kernel is double-counting inodes in the per-blockgroup
accounting structures. When a blockgroup fills up this triggers a
consistency check and the filesystem is remounted read-only.
There is no data loss, but all ext3 filesystems which have been mounted
read/write under the 2.5.46 kernel will have incorrect accounting. They
must be fixed with a fsck. If this is not done, the filesystem will
be remounted read-only at some time in the future - when a blockgroup
runs out of inodes and the consistency check detects the error.
Step 1: patch the 2.5.46 kernel with the below fix
Step 2: reboot into the new kernel, forcing a fsck against all ext3
filesystems.
Alternatively, wait for 2.5.47 and then fsck all filesystems. The problem
only manifests if all of a blockgroup's inodes are consumed, and that is
rare.
--- 25/fs/ext3/ialloc.c~ext3-inodes-count-fix Wed Nov 6 16:16:55 2002
+++ 25-akpm/fs/ext3/ialloc.c Wed Nov 6 16:24:20 2002
@@ -227,11 +227,6 @@ static int find_group_dir(struct super_b
}
if (!best_desc)
return -1;
- best_desc->bg_free_inodes_count =
- cpu_to_le16(le16_to_cpu(best_desc->bg_free_inodes_count) - 1);
- best_desc->bg_used_dirs_count =
- cpu_to_le16(le16_to_cpu(best_desc->bg_used_dirs_count) + 1);
- mark_buffer_dirty(best_bh);
return best_group;
}
@@ -355,14 +350,7 @@ fallback:
}
return -1;
-
found:
- desc->bg_free_inodes_count =
- cpu_to_le16(le16_to_cpu(desc->bg_free_inodes_count) - 1);
- desc->bg_used_dirs_count =
- cpu_to_le16(le16_to_cpu(desc->bg_used_dirs_count) + 1);
- sbi->s_dir_count++;
- mark_buffer_dirty(bh);
return group;
}
@@ -410,9 +398,6 @@ static int find_group_other(struct super
return -1;
found:
- desc->bg_free_inodes_count =
- cpu_to_le16(le16_to_cpu(desc->bg_free_inodes_count) - 1);
- mark_buffer_dirty(bh);
return group;
}
@@ -521,9 +506,11 @@ repeat:
if (err) goto fail;
gdp->bg_free_inodes_count =
cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) - 1);
- if (S_ISDIR(mode))
+ if (S_ISDIR(mode)) {
gdp->bg_used_dirs_count =
cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) + 1);
+ EXT3_SB(sb)->s_dir_count++;
+ }
BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
err = ext3_journal_dirty_metadata(handle, bh2);
if (err) goto fail;
_
-
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This archive was generated by hypermail 2b29 : Thu Nov 07 2002 - 22:00:46 EST