diff options
| author | Alexey Dobriyan <adobriyan@gmail.com> | 2008-09-14 10:21:33 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-09-14 10:21:33 -0400 |
| commit | 899fc1a4cf404747de2666534d508804597ee22f (patch) | |
| tree | 4d3079f33198272fe0dfc6a08fe63dad659a374e /fs/ext4 | |
| parent | c62a11fd9555007b1caab83b5bcbb443a43e32bb (diff) | |
| download | linux-3.10-899fc1a4cf404747de2666534d508804597ee22f.tar.gz linux-3.10-899fc1a4cf404747de2666534d508804597ee22f.tar.bz2 linux-3.10-899fc1a4cf404747de2666534d508804597ee22f.zip | |
ext4: fix #11321: create /proc/ext4/*/stats more carefully
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.
http://bugzilla.kernel.org/show_bug.cgi?id=11321
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/mballoc.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 585c2595018..9122271e3d6 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -2786,14 +2786,20 @@ static int ext4_mb_init_per_dev_proc(struct super_block *sb) mode_t mode = S_IFREG | S_IRUGO | S_IWUSR; struct ext4_sb_info *sbi = EXT4_SB(sb); struct proc_dir_entry *proc; - char devname[64]; + char devname[BDEVNAME_SIZE], *p; if (proc_root_ext4 == NULL) { sbi->s_mb_proc = NULL; return -EINVAL; } bdevname(sb->s_bdev, devname); + p = devname; + while ((p = strchr(p, '/'))) + *p = '!'; + sbi->s_mb_proc = proc_mkdir(devname, proc_root_ext4); + if (!sbi->s_mb_proc) + goto err_create_dir; MB_PROC_HANDLER(EXT4_MB_STATS_NAME, stats); MB_PROC_HANDLER(EXT4_MB_MAX_TO_SCAN_NAME, max_to_scan); @@ -2805,7 +2811,6 @@ static int ext4_mb_init_per_dev_proc(struct super_block *sb) return 0; err_out: - printk(KERN_ERR "EXT4-fs: Unable to create %s\n", devname); remove_proc_entry(EXT4_MB_GROUP_PREALLOC, sbi->s_mb_proc); remove_proc_entry(EXT4_MB_STREAM_REQ, sbi->s_mb_proc); remove_proc_entry(EXT4_MB_ORDER2_REQ, sbi->s_mb_proc); @@ -2814,6 +2819,8 @@ err_out: remove_proc_entry(EXT4_MB_STATS_NAME, sbi->s_mb_proc); remove_proc_entry(devname, proc_root_ext4); sbi->s_mb_proc = NULL; +err_create_dir: + printk(KERN_ERR "EXT4-fs: Unable to create %s\n", devname); return -ENOMEM; } @@ -2821,12 +2828,15 @@ err_out: static int ext4_mb_destroy_per_dev_proc(struct super_block *sb) { struct ext4_sb_info *sbi = EXT4_SB(sb); - char devname[64]; + char devname[BDEVNAME_SIZE], *p; if (sbi->s_mb_proc == NULL) return -EINVAL; bdevname(sb->s_bdev, devname); + p = devname; + while ((p = strchr(p, '/'))) + *p = '!'; remove_proc_entry(EXT4_MB_GROUP_PREALLOC, sbi->s_mb_proc); remove_proc_entry(EXT4_MB_STREAM_REQ, sbi->s_mb_proc); remove_proc_entry(EXT4_MB_ORDER2_REQ, sbi->s_mb_proc); |