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Date: Mon, 22 Sep 2008 14:07:06 -0700
From: akpm@...ux-foundation.org
To: tytso@....edu
Cc: linux-ext4@...r.kernel.org, akpm@...ux-foundation.org,
adobriyan@...il.com, adilger@....com, ralf.hildebrandt@...rite.de
Subject: [patch for 2.6.27? 1/1] ext4: create /proc/ext4/*/stats et al more carefully
From: Alexey Dobriyan <adobriyan@...il.com>
Addresses http://bugzilla.kernel.org/show_bug.cgi?id=11321
ext4 creates per-suberblock directory in /proc/ext4/ . Name used as basis
is taken from bdevname, which, surprise, can contain slash.
However, proc while allowing to use proc_create("a/b", parent) form of
PDE creation, assumes that parent/a was already created.
bdevname in question is 'cciss/c0d0p9', directory is not created and all
this stuff goes directly into /proc (which is real bug).
Warning comes when _second_ partition is mounted.
Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
Reported-by: Ralf Hildebrandt <ralf.hildebrandt@...rite.de>
Tested-by: Ralf Hildebrandt <ralf.hildebrandt@...rite.de>
Cc: Andreas Dilger <adilger@....com>
Cc: Theodore Ts'o <tytso@....edu>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
fs/ext4/mballoc.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff -puN fs/ext4/mballoc.c~ext4-fix-11321-create-proc-ext4-stats-et-al-more-carefully fs/ext4/mballoc.c
--- a/fs/ext4/mballoc.c~ext4-fix-11321-create-proc-ext4-stats-et-al-more-carefully
+++ a/fs/ext4/mballoc.c
@@ -2792,6 +2792,15 @@ static int ext4_mb_init_per_dev_proc(str
return -EINVAL;
}
bdevname(sb->s_bdev, devname);
+ {
+ char *p = devname;
+
+ while (*p != '\0') {
+ if (*p == '/')
+ *p = '!';
+ p++;
+ }
+ }
sbi->s_mb_proc = proc_mkdir(devname, proc_root_ext4);
MB_PROC_HANDLER(EXT4_MB_STATS_NAME, stats);
_
--
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