@@ -735,10 +735,13 @@ struct block_device *blkdev_get_no_open(dev_t dev)
{
struct block_device *bdev;
struct inode *inode;
+ int ret;
inode = ilookup(blockdev_superblock, dev);
if (!inode) {
- blk_request_module(dev);
+ ret = blk_request_module(dev);
+ if (ret)
+ return NULL;
inode = ilookup(blockdev_superblock, dev);
if (!inode)
return NULL;
@@ -183,7 +183,7 @@ static struct blk_major_name {
struct blk_major_name *next;
int major;
char name[16];
- void (*probe)(dev_t devt);
+ int (*probe)(dev_t devt);
} *major_names[BLKDEV_MAJOR_HASH_SIZE];
static DEFINE_MUTEX(major_names_lock);
static DEFINE_SPINLOCK(major_names_spinlock);
@@ -213,7 +213,13 @@ void blkdev_show(struct seq_file *seqf, off_t offset)
* @major: the requested major device number [1..BLKDEV_MAJOR_MAX-1]. If
* @major = 0, try to allocate any unused major number.
* @name: the name of the new block device as a zero terminated string
- * @probe: allback that is called on access to any minor number of @major
+ * @probe: callback that is called on access to any minor number of @major.
+ * This will return 0 if the block device is already present or was
+ * not present and it succcessfully added a new one. If the block device
+ * was not already present but it was a valid request an error reflecting
+ * the reason why adding the block device is returned. An error should not
+ * be returned if the block device already exists as otherwise concurrent
+ * requests to open an existing block device would fail.
*
* The @name must be unique within the system.
*
@@ -231,7 +237,7 @@ void blkdev_show(struct seq_file *seqf, off_t offset)
* Use register_blkdev instead for any new code.
*/
int __register_blkdev(unsigned int major, const char *name,
- void (*probe)(dev_t devt))
+ int (*probe)(dev_t devt))
{
struct blk_major_name **n, *p;
int index, ret = 0;
@@ -650,17 +656,18 @@ static ssize_t disk_badblocks_store(struct device *dev,
return badblocks_store(disk->bb, page, len, 0);
}
-void blk_request_module(dev_t devt)
+int blk_request_module(dev_t devt)
{
unsigned int major = MAJOR(devt);
struct blk_major_name **n;
+ int err;
mutex_lock(&major_names_lock);
for (n = &major_names[major_to_index(major)]; *n; n = &(*n)->next) {
if ((*n)->major == major && (*n)->probe) {
- (*n)->probe(devt);
+ err = (*n)->probe(devt);
mutex_unlock(&major_names_lock);
- return;
+ return err;
}
}
mutex_unlock(&major_names_lock);
@@ -668,6 +675,8 @@ void blk_request_module(dev_t devt)
if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0)
/* Make old-style 2.4 aliases work */
request_module("block-major-%d", MAJOR(devt));
+
+ return 0;
}
/*
@@ -1976,22 +1976,31 @@ static int ataflop_alloc_disk(unsigned int drive, unsigned int type)
return 0;
}
-static void ataflop_probe(dev_t dev)
+static int ataflop_probe(dev_t dev)
{
int drive = MINOR(dev) & 3;
int type = MINOR(dev) >> 2;
+ int err = 0;
if (type)
type--;
if (drive >= FD_MAX_UNITS || type >= NUM_DISK_MINORS)
- return;
+ return -EINVAL;
+
if (!unit[drive].disk[type]) {
- if (ataflop_alloc_disk(drive, type) == 0) {
- add_disk(unit[drive].disk[type]);
- unit[drive].registered[type] = true;
+ err = ataflop_alloc_disk(drive, type);
+ if (err == 0) {
+ err = add_disk(unit[drive].disk[type]);
+ if (err) {
+ blk_cleanup_disk(unit[drive].disk[type]);
+ unit[drive].disk[type] = NULL;
+ } else
+ unit[drive].registered[type] = true;
}
}
+
+ return err;
}
static void atari_floppy_cleanup(void)
@@ -437,9 +437,12 @@ static int brd_alloc(int i)
return err;
}
-static void brd_probe(dev_t dev)
+static int brd_probe(dev_t dev)
{
- brd_alloc(MINOR(dev) / max_part);
+ int ret = brd_alloc(MINOR(dev) / max_part);
+ if (ret == -EEXIST)
+ return 0;
+ return ret;
}
static void brd_del_one(struct brd_device *brd)
@@ -4518,21 +4518,30 @@ static int floppy_alloc_disk(unsigned int drive, unsigned int type)
static DEFINE_MUTEX(floppy_probe_lock);
-static void floppy_probe(dev_t dev)
+static int floppy_probe(dev_t dev)
{
unsigned int drive = (MINOR(dev) & 3) | ((MINOR(dev) & 0x80) >> 5);
unsigned int type = (MINOR(dev) >> 2) & 0x1f;
+ int err = 0;
if (drive >= N_DRIVE || !floppy_available(drive) ||
type >= ARRAY_SIZE(floppy_type))
- return;
+ return -EINVAL;
mutex_lock(&floppy_probe_lock);
if (!disks[drive][type]) {
- if (floppy_alloc_disk(drive, type) == 0)
- add_disk(disks[drive][type]);
+ err = floppy_alloc_disk(drive, type);
+ if (err == 0) {
+ err = add_disk(disks[drive][type]);
+ if (err) {
+ blk_cleanup_disk(disks[drive][type]);
+ disks[drive][type] = NULL;
+ }
+ }
}
mutex_unlock(&floppy_probe_lock);
+
+ return err;
}
static int __init do_floppy_init(void)
@@ -2433,13 +2433,18 @@ static void loop_remove(struct loop_device *lo)
kfree(lo);
}
-static void loop_probe(dev_t dev)
+static int loop_probe(dev_t dev)
{
int idx = MINOR(dev) >> part_shift;
+ int ret;
if (max_loop && idx >= max_loop)
- return;
- loop_add(idx);
+ return -EINVAL;
+ ret = loop_add(idx);
+ if (ret == -EEXIST)
+ return 0;
+
+ return ret;
}
static int loop_control_remove(int idx)
@@ -5737,12 +5737,18 @@ static int md_alloc(dev_t dev, char *name)
return error;
}
-static void md_probe(dev_t dev)
+static int md_probe(dev_t dev)
{
+ int error = 0;
+
if (MAJOR(dev) == MD_MAJOR && MINOR(dev) >= 512)
- return;
+ return -EINVAL;
if (create_on_open)
- md_alloc(dev, NULL);
+ error = md_alloc(dev, NULL);
+ if (error == -EEXIST)
+ return 0;
+
+ return error;
}
static int add_named_array(const char *val, const struct kernel_param *kp)
@@ -632,8 +632,9 @@ static struct scsi_driver sd_template = {
* Don't request a new module, as that could deadlock in multipath
* environment.
*/
-static void sd_default_probe(dev_t devt)
+static int sd_default_probe(dev_t devt)
{
+ return 0;
}
/*
@@ -288,7 +288,7 @@ struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass);
void blk_cleanup_disk(struct gendisk *disk);
int __register_blkdev(unsigned int major, const char *name,
- void (*probe)(dev_t devt));
+ int (*probe)(dev_t devt));
#define register_blkdev(major, name) \
__register_blkdev(major, name, NULL)
void unregister_blkdev(unsigned int major, const char *name);
@@ -320,7 +320,7 @@ static inline int bd_register_pending_holders(struct gendisk *disk)
dev_t part_devt(struct gendisk *disk, u8 partno);
void inc_diskseq(struct gendisk *disk);
dev_t blk_lookup_devt(const char *name, int partno);
-void blk_request_module(dev_t devt);
+int blk_request_module(dev_t devt);
#ifdef CONFIG_BLOCK
void printk_all_partitions(void);
#else /* CONFIG_BLOCK */
This makes __register_blkdev() return an error, and also changes the probe() call to return an error as well. We expand documentation for the probe call to ensure that if the block device already exists we don't return on error on that condition. We do this as otherwise we loose ability to handle concurrent requests if the block device already existed. Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org> --- block/bdev.c | 5 ++++- block/genhd.c | 21 +++++++++++++++------ drivers/block/ataflop.c | 19 ++++++++++++++----- drivers/block/brd.c | 7 +++++-- drivers/block/floppy.c | 17 +++++++++++++---- drivers/block/loop.c | 11 ++++++++--- drivers/md/md.c | 12 +++++++++--- drivers/scsi/sd.c | 3 ++- include/linux/genhd.h | 4 ++-- 9 files changed, 72 insertions(+), 27 deletions(-)