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Subject[PATCH] ubifs: allow more than one volume to be mounted
Date
UBIFS uses a bdi device per volume, but does not care to hand out unique
names to each of them. This causes an error when trying to mount more
than one volumes.

[ 239.277407] kobject_add_internal failed for ubifs with -EEXIST, don't try to register things with the same name in the same directory.
[ 239.289618] [<c002a45c>] (unwind_backtrace+0x0/0xdc) from [<c0160628>] (kobject_add_internal+0x188/0x1b8)
[ 239.299445] [<c0160628>] (kobject_add_internal+0x188/0x1b8) from [<c01607d8>] (kobject_add+0x48/0x5c)
[ 239.308896] [<c01607d8>] (kobject_add+0x48/0x5c) from [<c019d96c>] (device_add+0xac/0x510)
[ 239.317392] [<c019d96c>] (device_add+0xac/0x510) from [<c019de58>] (device_create_vargs+0x70/0xa4)
[ 239.326589] [<c019de58>] (device_create_vargs+0x70/0xa4) from [<c0073138>] (bdi_register+0x44/0x64)
[ 239.335854] [<c0073138>] (bdi_register+0x44/0x64) from [<c01249f0>] (ubifs_get_sb+0x3c8/0x10cc)
[ 239.344769] [<c01249f0>] (ubifs_get_sb+0x3c8/0x10cc) from [<c008b054>] (vfs_kern_mount+0x50/0xa8)
[ 239.353867] [<c008b054>] (vfs_kern_mount+0x50/0xa8) from [<c008b0f0>] (do_kern_mount+0x34/0xd0)
[ 239.362799] [<c008b0f0>] (do_kern_mount+0x34/0xd0) from [<c009f7b4>] (do_mount+0x644/0x6b4)
[ 239.371377] [<c009f7b4>] (do_mount+0x644/0x6b4) from [<c009f8a8>] (sys_mount+0x84/0xcc)
[ 239.379538] [<c009f8a8>] (sys_mount+0x84/0xcc) from [<c0025e80>] (ret_fast_syscall+0x0/0x2c)

Append the UBI volume and device ID to avoid that.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: Artem Bityutskiy <dedekind@infradead.org>
Cc: Adrian Hunter <ext-adrian.hunter@nokia.com>
Cc: linux-mtd@lists.infradead.org
---
fs/ubifs/super.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 79fad43..fca5ebe 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -1910,6 +1910,7 @@ static struct ubi_volume_desc *open_ubi(const char *name, int mode)
static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
{
struct ubi_volume_desc *ubi = sb->s_fs_info;
+ struct ubi_volume_info ubi_info;
struct ubifs_info *c;
struct inode *root;
int err;
@@ -1975,7 +1976,9 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
err = bdi_init(&c->bdi);
if (err)
goto out_close;
- err = bdi_register(&c->bdi, NULL, "ubifs");
+ ubi_get_volume_info(ubi, &ubi_info);
+ err = bdi_register(&c->bdi, NULL, "ubifs_%d_%d",
+ ubi_info.ubi_num, ubi_info.vol_id);
if (err)
goto out_bdi;

--
1.6.3.1


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