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Merge branch 'cleanup-bd_claim' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc into for-2.6.38/core

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This commit is contained in:
Jens Axboe 2010-11-27 19:49:18 +01:00
commit f30195c502
28 changed files with 383 additions and 725 deletions
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5
block/ioctl.c
View file

@ -295,11 +295,12 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
return -EINVAL;
if (get_user(n, (int __user *) arg))
return -EFAULT;
if (!(mode & FMODE_EXCL) && bd_claim(bdev, &bdev) < 0)
if (!(mode & FMODE_EXCL) &&
blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0)
return -EBUSY;
ret = set_blocksize(bdev, n);
if (!(mode & FMODE_EXCL))
bd_release(bdev);
blkdev_put(bdev, mode | FMODE_EXCL);
return ret;
case BLKPG:
ret = blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);

2
drivers/block/drbd/drbd_int.h
View file

@ -911,8 +911,6 @@ struct drbd_md {
struct drbd_backing_dev {
struct block_device *backing_bdev;
struct block_device *md_bdev;
struct file *lo_file;
struct file *md_file;
struct drbd_md md;
struct disk_conf dc; /* The user provided config... */
sector_t known_size; /* last known size of that backing device */

7
drivers/block/drbd/drbd_main.c
View file

@ -3372,11 +3372,8 @@ void drbd_free_bc(struct drbd_backing_dev *ldev)
if (ldev == NULL)
return;
bd_release(ldev->backing_bdev);
bd_release(ldev->md_bdev);
fput(ldev->lo_file);
fput(ldev->md_file);
blkdev_put(ldev->backing_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
blkdev_put(ldev->md_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
kfree(ldev);
}

103
drivers/block/drbd/drbd_nl.c
View file

@ -855,7 +855,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
sector_t max_possible_sectors;
sector_t min_md_device_sectors;
struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
struct inode *inode, *inode2;
struct block_device *bdev;
struct lru_cache *resync_lru = NULL;
union drbd_state ns, os;
unsigned int max_seg_s;
@ -907,46 +907,40 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
}
}
nbc->lo_file = filp_open(nbc->dc.backing_dev, O_RDWR, 0);
if (IS_ERR(nbc->lo_file)) {
bdev = blkdev_get_by_path(nbc->dc.backing_dev,
FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
if (IS_ERR(bdev)) {
dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
PTR_ERR(nbc->lo_file));
nbc->lo_file = NULL;
PTR_ERR(bdev));
retcode = ERR_OPEN_DISK;
goto fail;
}
nbc->backing_bdev = bdev;
inode = nbc->lo_file->f_dentry->d_inode;
if (!S_ISBLK(inode->i_mode)) {
retcode = ERR_DISK_NOT_BDEV;
goto fail;
}
nbc->md_file = filp_open(nbc->dc.meta_dev, O_RDWR, 0);
if (IS_ERR(nbc->md_file)) {
/*
* meta_dev_idx >= 0: external fixed size, possibly multiple
* drbd sharing one meta device. TODO in that case, paranoia
* check that [md_bdev, meta_dev_idx] is not yet used by some
* other drbd minor! (if you use drbd.conf + drbdadm, that
* should check it for you already; but if you don't, or
* someone fooled it, we need to double check here)
*/
bdev = blkdev_get_by_path(nbc->dc.meta_dev,
FMODE_READ | FMODE_WRITE | FMODE_EXCL,
(nbc->dc.meta_dev_idx < 0) ?
(void *)mdev : (void *)drbd_m_holder);
if (IS_ERR(bdev)) {
dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
PTR_ERR(nbc->md_file));
nbc->md_file = NULL;
PTR_ERR(bdev));
retcode = ERR_OPEN_MD_DISK;
goto fail;
}
nbc->md_bdev = bdev;
inode2 = nbc->md_file->f_dentry->d_inode;
if (!S_ISBLK(inode2->i_mode)) {
retcode = ERR_MD_NOT_BDEV;
goto fail;
}
nbc->backing_bdev = inode->i_bdev;
if (bd_claim(nbc->backing_bdev, mdev)) {
printk(KERN_ERR "drbd: bd_claim(%p,%p); failed [%p;%p;%u]\n",
nbc->backing_bdev, mdev,
nbc->backing_bdev->bd_holder,
nbc->backing_bdev->bd_contains->bd_holder,
nbc->backing_bdev->bd_holders);
retcode = ERR_BDCLAIM_DISK;
if ((nbc->backing_bdev == nbc->md_bdev) !=
(nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
retcode = ERR_MD_IDX_INVALID;
goto fail;
}
@ -955,28 +949,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
offsetof(struct bm_extent, lce));
if (!resync_lru) {
retcode = ERR_NOMEM;
goto release_bdev_fail;
}
/* meta_dev_idx >= 0: external fixed size,
* possibly multiple drbd sharing one meta device.
* TODO in that case, paranoia check that [md_bdev, meta_dev_idx] is
* not yet used by some other drbd minor!
* (if you use drbd.conf + drbdadm,
* that should check it for you already; but if you don't, or someone
* fooled it, we need to double check here) */
nbc->md_bdev = inode2->i_bdev;
if (bd_claim(nbc->md_bdev, (nbc->dc.meta_dev_idx < 0) ? (void *)mdev
: (void *) drbd_m_holder)) {
retcode = ERR_BDCLAIM_MD_DISK;
goto release_bdev_fail;
}
if ((nbc->backing_bdev == nbc->md_bdev) !=
(nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
retcode = ERR_MD_IDX_INVALID;
goto release_bdev2_fail;
goto fail;
}
/* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
@ -987,7 +960,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
(unsigned long long) drbd_get_max_capacity(nbc),
(unsigned long long) nbc->dc.disk_size);
retcode = ERR_DISK_TO_SMALL;
goto release_bdev2_fail;
goto fail;
}
if (nbc->dc.meta_dev_idx < 0) {
@ -1004,7 +977,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
dev_warn(DEV, "refusing attach: md-device too small, "
"at least %llu sectors needed for this meta-disk type\n",
(unsigned long long) min_md_device_sectors);
goto release_bdev2_fail;
goto fail;
}
/* Make sure the new disk is big enough
@ -1012,7 +985,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
if (drbd_get_max_capacity(nbc) <
drbd_get_capacity(mdev->this_bdev)) {
retcode = ERR_DISK_TO_SMALL;
goto release_bdev2_fail;
goto fail;
}
nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
@ -1035,7 +1008,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
drbd_resume_io(mdev);
if (retcode < SS_SUCCESS)
goto release_bdev2_fail;
goto fail;
if (!get_ldev_if_state(mdev, D_ATTACHING))
goto force_diskless;
@ -1269,18 +1242,14 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
force_diskless:
drbd_force_state(mdev, NS(disk, D_FAILED));
drbd_md_sync(mdev);
release_bdev2_fail:
if (nbc)
bd_release(nbc->md_bdev);
release_bdev_fail:
if (nbc)
bd_release(nbc->backing_bdev);
fail:
if (nbc) {
if (nbc->lo_file)
fput(nbc->lo_file);
if (nbc->md_file)
fput(nbc->md_file);
if (nbc->backing_bdev)
blkdev_put(nbc->backing_bdev,
FMODE_READ | FMODE_WRITE | FMODE_EXCL);
if (nbc->md_bdev)
blkdev_put(nbc->md_bdev,
FMODE_READ | FMODE_WRITE | FMODE_EXCL);
kfree(nbc);
}
lc_destroy(resync_lru);

22
drivers/block/pktcdvd.c
View file

@ -2296,15 +2296,12 @@ static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
* so bdget() can't fail.
*/
bdget(pd->bdev->bd_dev);
if ((ret = blkdev_get(pd->bdev, FMODE_READ)))
if ((ret = blkdev_get(pd->bdev, FMODE_READ | FMODE_EXCL, pd)))
goto out;
if ((ret = bd_claim(pd->bdev, pd)))
goto out_putdev;
if ((ret = pkt_get_last_written(pd, &lba))) {
printk(DRIVER_NAME": pkt_get_last_written failed\n");
goto out_unclaim;
goto out_putdev;
}
set_capacity(pd->disk, lba << 2);
@ -2314,7 +2311,7 @@ static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
q = bdev_get_queue(pd->bdev);
if (write) {
if ((ret = pkt_open_write(pd)))
goto out_unclaim;
goto out_putdev;
/*
* Some CDRW drives can not handle writes larger than one packet,
* even if the size is a multiple of the packet size.
@ -2329,23 +2326,21 @@ static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write)
}
if ((ret = pkt_set_segment_merging(pd, q)))
goto out_unclaim;
goto out_putdev;
if (write) {
if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
printk(DRIVER_NAME": not enough memory for buffers\n");
ret = -ENOMEM;
goto out_unclaim;
goto out_putdev;
}
printk(DRIVER_NAME": %lukB available on disc\n", lba << 1);
}
return 0;
out_unclaim:
bd_release(pd->bdev);
out_putdev:
blkdev_put(pd->bdev, FMODE_READ);
blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL);
out:
return ret;
}
@ -2362,8 +2357,7 @@ static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
pkt_lock_door(pd, 0);
pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
bd_release(pd->bdev);
blkdev_put(pd->bdev, FMODE_READ);
blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL);
pkt_shrink_pktlist(pd);
}
@ -2733,7 +2727,7 @@ static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
bdev = bdget(dev);
if (!bdev)
return -ENOMEM;
ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY);
ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY, NULL);
if (ret)
return ret;

14
drivers/char/raw.c
View file

@ -65,15 +65,12 @@ static int raw_open(struct inode *inode, struct file *filp)
if (!bdev)
goto out;
igrab(bdev->bd_inode);
err = blkdev_get(bdev, filp->f_mode);
err = blkdev_get(bdev, filp->f_mode | FMODE_EXCL, raw_open);
if (err)
goto out;
err = bd_claim(bdev, raw_open);
if (err)
goto out1;
err = set_blocksize(bdev, bdev_logical_block_size(bdev));
if (err)
goto out2;
goto out1;
filp->f_flags |= O_DIRECT;
filp->f_mapping = bdev->bd_inode->i_mapping;
if (++raw_devices[minor].inuse == 1)
@ -83,10 +80,8 @@ static int raw_open(struct inode *inode, struct file *filp)
mutex_unlock(&raw_mutex);
return 0;
out2:
bd_release(bdev);
out1:
blkdev_put(bdev, filp->f_mode);
blkdev_put(bdev, filp->f_mode | FMODE_EXCL);
out:
mutex_unlock(&raw_mutex);
return err;
@ -110,8 +105,7 @@ static int raw_release(struct inode *inode, struct file *filp)
}
mutex_unlock(&raw_mutex);
bd_release(bdev);
blkdev_put(bdev, filp->f_mode);
blkdev_put(bdev, filp->f_mode | FMODE_EXCL);
return 0;
}

20
drivers/md/dm-table.c
View file

@ -325,15 +325,18 @@ static int open_dev(struct dm_dev_internal *d, dev_t dev,
BUG_ON(d->dm_dev.bdev);
bdev = open_by_devnum(dev, d->dm_dev.mode);
bdev = blkdev_get_by_dev(dev, d->dm_dev.mode | FMODE_EXCL, _claim_ptr);
if (IS_ERR(bdev))
return PTR_ERR(bdev);
r = bd_claim_by_disk(bdev, _claim_ptr, dm_disk(md));
if (r)
blkdev_put(bdev, d->dm_dev.mode);
else
d->dm_dev.bdev = bdev;
return r;
r = bd_link_disk_holder(bdev, dm_disk(md));
if (r) {
blkdev_put(bdev, d->dm_dev.mode | FMODE_EXCL);
return r;
}
d->dm_dev.bdev = bdev;
return 0;
}
/*
@ -344,8 +347,7 @@ static void close_dev(struct dm_dev_internal *d, struct mapped_device *md)
if (!d->dm_dev.bdev)
return;
bd_release_from_disk(d->dm_dev.bdev, dm_disk(md));
blkdev_put(d->dm_dev.bdev, d->dm_dev.mode);
blkdev_put(d->dm_dev.bdev, d->dm_dev.mode | FMODE_EXCL);
d->dm_dev.bdev = NULL;
}

16
drivers/md/md.c
View file

@ -1880,7 +1880,7 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state");
list_add_rcu(&rdev->same_set, &mddev->disks);
bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
bd_link_disk_holder(rdev->bdev, mddev->gendisk);
/* May as well allow recovery to be retried once */
mddev->recovery_disabled = 0;
@ -1907,7 +1907,6 @@ static void unbind_rdev_from_array(mdk_rdev_t * rdev)
MD_BUG();
return;
}
bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
list_del_rcu(&rdev->same_set);
printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
rdev->mddev = NULL;
@ -1935,19 +1934,13 @@ static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
struct block_device *bdev;
char b[BDEVNAME_SIZE];
bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
shared ? (mdk_rdev_t *)lock_rdev : rdev);
if (IS_ERR(bdev)) {
printk(KERN_ERR "md: could not open %s.\n",
__bdevname(dev, b));
return PTR_ERR(bdev);
}
err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
if (err) {
printk(KERN_ERR "md: could not bd_claim %s.\n",
bdevname(bdev, b));
blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
return err;
}
if (!shared)
set_bit(AllReserved, &rdev->flags);
rdev->bdev = bdev;
@ -1960,8 +1953,7 @@ static void unlock_rdev(mdk_rdev_t *rdev)
rdev->bdev = NULL;
if (!bdev)
MD_BUG();
bd_release(bdev);
blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
}
void md_autodetect_dev(dev_t dev);

10
drivers/mtd/devices/block2mtd.c
View file

@ -224,7 +224,7 @@ static void block2mtd_free_device(struct block2mtd_dev *dev)
if (dev->blkdev) {
invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping,
0, -1);
close_bdev_exclusive(dev->blkdev, FMODE_READ|FMODE_WRITE);
blkdev_put(dev->blkdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
}
kfree(dev);
@ -234,6 +234,7 @@ static void block2mtd_free_device(struct block2mtd_dev *dev)
/* FIXME: ensure that mtd->size % erase_size == 0 */
static struct block2mtd_dev *add_device(char *devname, int erase_size)
{
const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
struct block_device *bdev;
struct block2mtd_dev *dev;
char *name;
@ -246,7 +247,7 @@ static struct block2mtd_dev *add_device(char *devname, int erase_size)
return NULL;
/* Get a handle on the device */
bdev = open_bdev_exclusive(devname, FMODE_READ|FMODE_WRITE, NULL);
bdev = blkdev_get_by_path(devname, mode, dev);
#ifndef MODULE
if (IS_ERR(bdev)) {
@ -254,9 +255,8 @@ static struct block2mtd_dev *add_device(char *devname, int erase_size)
to resolve the device name by other means. */
dev_t devt = name_to_dev_t(devname);
if (devt) {
bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ);
}
if (devt)
bdev = blkdev_get_by_dev(devt, mode, dev);
}
#endif

2
drivers/s390/block/dasd_genhd.c
View file

@ -103,7 +103,7 @@ int dasd_scan_partitions(struct dasd_block *block)
struct block_device *bdev;
bdev = bdget_disk(block->gdp, 0);
if (!bdev || blkdev_get(bdev, FMODE_READ) < 0)
if (!bdev || blkdev_get(bdev, FMODE_READ, NULL) < 0)
return -ENODEV;
/*
* See fs/partition/check.c:register_disk,rescan_partitions

7
drivers/usb/gadget/storage_common.c
View file

@ -543,7 +543,7 @@ static int fsg_lun_open(struct fsg_lun *curlun, const char *filename)
ro = curlun->initially_ro;
if (!ro) {
filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0);
if (-EROFS == PTR_ERR(filp))
if (PTR_ERR(filp) == -EROFS || PTR_ERR(filp) == -EACCES)
ro = 1;
}
if (ro)
@ -558,10 +558,7 @@ static int fsg_lun_open(struct fsg_lun *curlun, const char *filename)
if (filp->f_path.dentry)
inode = filp->f_path.dentry->d_inode;
if (inode && S_ISBLK(inode->i_mode)) {
if (bdev_read_only(inode->i_bdev))
ro = 1;
} else if (!inode || !S_ISREG(inode->i_mode)) {
if (!inode || (!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode))) {
LINFO(curlun, "invalid file type: %s\n", filename);
goto out;
}

720
fs/block_dev.c
View file

@ -426,9 +426,6 @@ static void init_once(void *foo)
mutex_init(&bdev->bd_mutex);
INIT_LIST_HEAD(&bdev->bd_inodes);
INIT_LIST_HEAD(&bdev->bd_list);
#ifdef CONFIG_SYSFS
INIT_LIST_HEAD(&bdev->bd_holder_list);
#endif
inode_init_once(&ei->vfs_inode);
/* Initialize mutex for freeze. */
mutex_init(&bdev->bd_fsfreeze_mutex);
@ -663,7 +660,7 @@ static bool bd_may_claim(struct block_device *bdev, struct block_device *whole,
else if (bdev->bd_contains == bdev)
return true; /* is a whole device which isn't held */
else if (whole->bd_holder == bd_claim)
else if (whole->bd_holder == bd_may_claim)
return true; /* is a partition of a device that is being partitioned */
else if (whole->bd_holder != NULL)
return false; /* is a partition of a held device */
@ -775,440 +772,88 @@ static struct block_device *bd_start_claiming(struct block_device *bdev,
}
}
/* releases bdev_lock */
static void __bd_abort_claiming(struct block_device *whole, void *holder)
{
BUG_ON(whole->bd_claiming != holder);
whole->bd_claiming = NULL;
wake_up_bit(&whole->bd_claiming, 0);
spin_unlock(&bdev_lock);
bdput(whole);
}
/**
* bd_abort_claiming - abort claiming a block device
* @whole: whole block device returned by bd_start_claiming()
* @holder: holder trying to claim @bdev
*
* Abort a claiming block started by bd_start_claiming(). Note that
* @whole is not the block device to be claimed but the whole device
* returned by bd_start_claiming().
*
* CONTEXT:
* Grabs and releases bdev_lock.
*/
static void bd_abort_claiming(struct block_device *whole, void *holder)
{
spin_lock(&bdev_lock);
__bd_abort_claiming(whole, holder); /* releases bdev_lock */
}
/* increment holders when we have a legitimate claim. requires bdev_lock */
static void __bd_claim(struct block_device *bdev, struct block_device *whole,
void *holder)
{
/* note that for a whole device bd_holders
* will be incremented twice, and bd_holder will
* be set to bd_claim before being set to holder
*/
whole->bd_holders++;
whole->bd_holder = bd_claim;
bdev->bd_holders++;
bdev->bd_holder = holder;
}
/**
* bd_finish_claiming - finish claiming a block device
* @bdev: block device of interest (passed to bd_start_claiming())
* @whole: whole block device returned by bd_start_claiming()
* @holder: holder trying to claim @bdev
*
* Finish a claiming block started by bd_start_claiming().
*
* CONTEXT:
* Grabs and releases bdev_lock.
*/
static void bd_finish_claiming(struct block_device *bdev,
struct block_device *whole, void *holder)
{
spin_lock(&bdev_lock);
BUG_ON(!bd_may_claim(bdev, whole, holder));
__bd_claim(bdev, whole, holder);
__bd_abort_claiming(whole, holder); /* not actually an abort */
}
/**
* bd_claim - claim a block device
* @bdev: block device to claim
* @holder: holder trying to claim @bdev
*
* Try to claim @bdev which must have been opened successfully.
*
* CONTEXT:
* Might sleep.
*
* RETURNS:
* 0 if successful, -EBUSY if @bdev is already claimed.
*/
int bd_claim(struct block_device *bdev, void *holder)
{
struct block_device *whole = bdev->bd_contains;
int res;
might_sleep();
spin_lock(&bdev_lock);
res = bd_prepare_to_claim(bdev, whole, holder);
if (res == 0)
__bd_claim(bdev, whole, holder);
spin_unlock(&bdev_lock);
return res;
}
EXPORT_SYMBOL(bd_claim);
void bd_release(struct block_device *bdev)
{
spin_lock(&bdev_lock);
if (!--bdev->bd_contains->bd_holders)
bdev->bd_contains->bd_holder = NULL;
if (!--bdev->bd_holders)
bdev->bd_holder = NULL;
spin_unlock(&bdev_lock);
}
EXPORT_SYMBOL(bd_release);
#ifdef CONFIG_SYSFS
/*
* Functions for bd_claim_by_kobject / bd_release_from_kobject
*
* If a kobject is passed to bd_claim_by_kobject()
* and the kobject has a parent directory,
* following symlinks are created:
* o from the kobject to the claimed bdev
* o from "holders" directory of the bdev to the parent of the kobject
* bd_release_from_kobject() removes these symlinks.
*
* Example:
* If /dev/dm-0 maps to /dev/sda, kobject corresponding to
* /sys/block/dm-0/slaves is passed to bd_claim_by_kobject(), then:
* /sys/block/dm-0/slaves/sda --> /sys/block/sda
* /sys/block/sda/holders/dm-0 --> /sys/block/dm-0
*/
static int add_symlink(struct kobject *from, struct kobject *to)
{
if (!from || !to)
return 0;
return sysfs_create_link(from, to, kobject_name(to));
}
static void del_symlink(struct kobject *from, struct kobject *to)
{
if (!from || !to)
return;
sysfs_remove_link(from, kobject_name(to));
}
/*
* 'struct bd_holder' contains pointers to kobjects symlinked by
* bd_claim_by_kobject.
* It's connected to bd_holder_list which is protected by bdev->bd_sem.
*/
struct bd_holder {
struct list_head list; /* chain of holders of the bdev */
int count; /* references from the holder */
struct kobject *sdir; /* holder object, e.g. "/block/dm-0/slaves" */
struct kobject *hdev; /* e.g. "/block/dm-0" */
struct kobject *hdir; /* e.g. "/block/sda/holders" */
struct kobject *sdev; /* e.g. "/block/sda" */
};
/*
* Get references of related kobjects at once.
* Returns 1 on success. 0 on failure.
*
* Should call bd_holder_release_dirs() after successful use.
*/
static int bd_holder_grab_dirs(struct block_device *bdev,
struct bd_holder *bo)
{
if (!bdev || !bo)
return 0;
bo->sdir = kobject_get(bo->sdir);
if (!bo->sdir)
return 0;
bo->hdev = kobject_get(bo->sdir->parent);
if (!bo->hdev)
goto fail_put_sdir;
bo->sdev = kobject_get(&part_to_dev(bdev->bd_part)->kobj);
if (!bo->sdev)
goto fail_put_hdev;
bo->hdir = kobject_get(bdev->bd_part->holder_dir);
if (!bo->hdir)
goto fail_put_sdev;
return 1;
fail_put_sdev:
kobject_put(bo->sdev);
fail_put_hdev:
kobject_put(bo->hdev);
fail_put_sdir:
kobject_put(bo->sdir);
return 0;
}
/* Put references of related kobjects at once. */
static void bd_holder_release_dirs(struct bd_holder *bo)
{
kobject_put(bo->hdir);
kobject_put(bo->sdev);
kobject_put(bo->hdev);
kobject_put(bo->sdir);
}
static struct bd_holder *alloc_bd_holder(struct kobject *kobj)
{
struct bd_holder *bo;
bo = kzalloc(sizeof(*bo), GFP_KERNEL);
if (!bo)
return NULL;
bo->count = 1;
bo->sdir = kobj;
return bo;
}
static void free_bd_holder(struct bd_holder *bo)
{
kfree(bo);
}
/**
* find_bd_holder - find matching struct bd_holder from the block device
* bd_link_disk_holder - create symlinks between holding disk and slave bdev
* @bdev: the claimed slave bdev
* @disk: the holding disk
*
* @bdev: struct block device to be searched
* @bo: target struct bd_holder
* This functions creates the following sysfs symlinks.
*
* Returns matching entry with @bo in @bdev->bd_holder_list.
* If found, increment the reference count and return the pointer.
* If not found, returns NULL.
* - from "slaves" directory of the holder @disk to the claimed @bdev
* - from "holders" directory of the @bdev to the holder @disk
*
* For example, if /dev/dm-0 maps to /dev/sda and disk for dm-0 is
* passed to bd_link_disk_holder(), then:
*
* /sys/block/dm-0/slaves/sda --> /sys/block/sda
* /sys/block/sda/holders/dm-0 --> /sys/block/dm-0
*
* The caller must have claimed @bdev before calling this function and
* ensure that both @bdev and @disk are valid during the creation and
* lifetime of these symlinks.
*
* CONTEXT:
* Might sleep.
*
* RETURNS:
* 0 on success, -errno on failure.
*/
static struct bd_holder *find_bd_holder(struct block_device *bdev,
struct bd_holder *bo)
int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk)
{
struct bd_holder *tmp;
list_for_each_entry(tmp, &bdev->bd_holder_list, list)
if (tmp->sdir == bo->sdir) {
tmp->count++;
return tmp;
}
return NULL;
}
/**
* add_bd_holder - create sysfs symlinks for bd_claim() relationship
*
* @bdev: block device to be bd_claimed
* @bo: preallocated and initialized by alloc_bd_holder()
*
* Add @bo to @bdev->bd_holder_list, create symlinks.
*
* Returns 0 if symlinks are created.
* Returns -ve if something fails.
*/
static int add_bd_holder(struct block_device *bdev, struct bd_holder *bo)
{
int err;
if (!bo)
return -EINVAL;
if (!bd_holder_grab_dirs(bdev, bo))
return -EBUSY;
err = add_symlink(bo->sdir, bo->sdev);
if (err)
return err;
err = add_symlink(bo->hdir, bo->hdev);
if (err) {
del_symlink(bo->sdir, bo->sdev);
return err;
}
list_add_tail(&bo->list, &bdev->bd_holder_list);
return 0;
}
/**
* del_bd_holder - delete sysfs symlinks for bd_claim() relationship
*
* @bdev: block device to be bd_claimed
* @kobj: holder's kobject
*
* If there is matching entry with @kobj in @bdev->bd_holder_list
* and no other bd_claim() from the same kobject,
* remove the struct bd_holder from the list, delete symlinks for it.
*
* Returns a pointer to the struct bd_holder when it's removed from the list
* and ready to be freed.
* Returns NULL if matching claim isn't found or there is other bd_claim()
* by the same kobject.
*/
static struct bd_holder *del_bd_holder(struct block_device *bdev,
struct kobject *kobj)
{
struct bd_holder *bo;
list_for_each_entry(bo, &bdev->bd_holder_list, list) {
if (bo->sdir == kobj) {
bo->count--;
BUG_ON(bo->count < 0);
if (!bo->count) {
list_del(&bo->list);
del_symlink(bo->sdir, bo->sdev);
del_symlink(bo->hdir, bo->hdev);
bd_holder_release_dirs(bo);
return bo;
}
break;
}
}
return NULL;
}
/**
* bd_claim_by_kobject - bd_claim() with additional kobject signature
*
* @bdev: block device to be claimed
* @holder: holder's signature
* @kobj: holder's kobject
*
* Do bd_claim() and if it succeeds, create sysfs symlinks between
* the bdev and the holder's kobject.
* Use bd_release_from_kobject() when relesing the claimed bdev.
*
* Returns 0 on success. (same as bd_claim())
* Returns errno on failure.
*/
static int bd_claim_by_kobject(struct block_device *bdev, void *holder,
struct kobject *kobj)
{
int err;
struct bd_holder *bo, *found;
if (!kobj)
return -EINVAL;
bo = alloc_bd_holder(kobj);
if (!bo)
return -ENOMEM;
int ret = 0;
mutex_lock(&bdev->bd_mutex);
err = bd_claim(bdev, holder);
if (err)
goto fail;
WARN_ON_ONCE(!bdev->bd_holder || bdev->bd_holder_disk);
found = find_bd_holder(bdev, bo);
if (found)
goto fail;
/* FIXME: remove the following once add_disk() handles errors */
if (WARN_ON(!disk->slave_dir || !bdev->bd_part->holder_dir))
goto out_unlock;
err = add_bd_holder(bdev, bo);
if (err)
bd_release(bdev);
else
bo = NULL;
fail:
ret = add_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj);
if (ret)
goto out_unlock;
ret = add_symlink(bdev->bd_part->holder_dir, &disk_to_dev(disk)->kobj);
if (ret) {
del_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj);
goto out_unlock;
}
bdev->bd_holder_disk = disk;
out_unlock:
mutex_unlock(&bdev->bd_mutex);
free_bd_holder(bo);
return err;
return ret;
}
EXPORT_SYMBOL_GPL(bd_link_disk_holder);
/**
* bd_release_from_kobject - bd_release() with additional kobject signature
*
* @bdev: block device to be released
* @kobj: holder's kobject
*
* Do bd_release() and remove sysfs symlinks created by bd_claim_by_kobject().
*/
static void bd_release_from_kobject(struct block_device *bdev,
struct kobject *kobj)
static void bd_unlink_disk_holder(struct block_device *bdev)
{
if (!kobj)
struct gendisk *disk = bdev->bd_holder_disk;
bdev->bd_holder_disk = NULL;
if (!disk)
return;
mutex_lock(&bdev->bd_mutex);
bd_release(bdev);
free_bd_holder(del_bd_holder(bdev, kobj));
mutex_unlock(&bdev->bd_mutex);
del_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj);
del_symlink(bdev->bd_part->holder_dir, &disk_to_dev(disk)->kobj);
}
/**
* bd_claim_by_disk - wrapper function for bd_claim_by_kobject()
*
* @bdev: block device to be claimed
* @holder: holder's signature
* @disk: holder's gendisk
*
* Call bd_claim_by_kobject() with getting @disk->slave_dir.
*/
int bd_claim_by_disk(struct block_device *bdev, void *holder,
struct gendisk *disk)
{
return bd_claim_by_kobject(bdev, holder, kobject_get(disk->slave_dir));
}
EXPORT_SYMBOL_GPL(bd_claim_by_disk);
/**
* bd_release_from_disk - wrapper function for bd_release_from_kobject()
*
* @bdev: block device to be claimed
* @disk: holder's gendisk
*
* Call bd_release_from_kobject() and put @disk->slave_dir.
*/
void bd_release_from_disk(struct block_device *bdev, struct gendisk *disk)
{
bd_release_from_kobject(bdev, disk->slave_dir);
kobject_put(disk->slave_dir);
}
EXPORT_SYMBOL_GPL(bd_release_from_disk);
#else
static inline void bd_unlink_disk_holder(struct block_device *bdev)
{ }
#endif
/*
* Tries to open block device by device number. Use it ONLY if you
* really do not have anything better - i.e. when you are behind a
* truly sucky interface and all you are given is a device number. _Never_
* to be used for internal purposes. If you ever need it - reconsider
* your API.
*/
struct block_device *open_by_devnum(dev_t dev, fmode_t mode)
{
struct block_device *bdev = bdget(dev);
int err = -ENOMEM;
if (bdev)
err = blkdev_get(bdev, mode);
return err ? ERR_PTR(err) : bdev;
}
EXPORT_SYMBOL(open_by_devnum);
/**
* flush_disk - invalidates all buffer-cache entries on a disk
*
@ -1469,17 +1114,156 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
return ret;
}
int blkdev_get(struct block_device *bdev, fmode_t mode)
/**
* blkdev_get - open a block device
* @bdev: block_device to open
* @mode: FMODE_* mask
* @holder: exclusive holder identifier
*
* Open @bdev with @mode. If @mode includes %FMODE_EXCL, @bdev is
* open with exclusive access. Specifying %FMODE_EXCL with %NULL
* @holder is invalid. Exclusive opens may nest for the same @holder.
*
* On success, the reference count of @bdev is unchanged. On failure,
* @bdev is put.
*
* CONTEXT:
* Might sleep.
*
* RETURNS:
* 0 on success, -errno on failure.
*/
int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder)
{
return __blkdev_get(bdev, mode, 0);
struct block_device *whole = NULL;
int res;
WARN_ON_ONCE((mode & FMODE_EXCL) && !holder);
if ((mode & FMODE_EXCL) && holder) {
whole = bd_start_claiming(bdev, holder);
if (IS_ERR(whole)) {
bdput(bdev);
return PTR_ERR(whole);
}
}
res = __blkdev_get(bdev, mode, 0);
/* __blkdev_get() may alter read only status, check it afterwards */
if (!res && (mode & FMODE_WRITE) && bdev_read_only(bdev)) {
__blkdev_put(bdev, mode, 0);
res = -EACCES;
}
if (whole) {
/* finish claiming */
spin_lock(&bdev_lock);
if (res == 0) {
BUG_ON(!bd_may_claim(bdev, whole, holder));
/*
* Note that for a whole device bd_holders
* will be incremented twice, and bd_holder
* will be set to bd_may_claim before being
* set to holder
*/
whole->bd_holders++;
whole->bd_holder = bd_may_claim;
bdev->bd_holders++;
bdev->bd_holder = holder;
}
/* tell others that we're done */
BUG_ON(whole->bd_claiming != holder);
whole->bd_claiming = NULL;
wake_up_bit(&whole->bd_claiming, 0);
spin_unlock(&bdev_lock);
bdput(whole);
}
return res;
}
EXPORT_SYMBOL(blkdev_get);
/**
* blkdev_get_by_path - open a block device by name
* @path: path to the block device to open
* @mode: FMODE_* mask
* @holder: exclusive holder identifier
*
* Open the blockdevice described by the device file at @path. @mode
* and @holder are identical to blkdev_get().
*
* On success, the returned block_device has reference count of one.
*
* CONTEXT:
* Might sleep.
*
* RETURNS:
* Pointer to block_device on success, ERR_PTR(-errno) on failure.
*/
struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
void *holder)
{
struct block_device *bdev;
int err;
bdev = lookup_bdev(path);
if (IS_ERR(bdev))
return bdev;
err = blkdev_get(bdev, mode, holder);
if (err)
return ERR_PTR(err);
return bdev;
}
EXPORT_SYMBOL(blkdev_get_by_path);
/**
* blkdev_get_by_dev - open a block device by device number
* @dev: device number of block device to open
* @mode: FMODE_* mask
* @holder: exclusive holder identifier
*
* Open the blockdevice described by device number @dev. @mode and
* @holder are identical to blkdev_get().
*
* Use it ONLY if you really do not have anything better - i.e. when
* you are behind a truly sucky interface and all you are given is a
* device number. _Never_ to be used for internal purposes. If you
* ever need it - reconsider your API.
*
* On success, the returned block_device has reference count of one.
*
* CONTEXT:
* Might sleep.
*
* RETURNS:
* Pointer to block_device on success, ERR_PTR(-errno) on failure.
*/
struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder)
{
struct block_device *bdev;
int err;
bdev = bdget(dev);
if (!bdev)
return ERR_PTR(-ENOMEM);
err = blkdev_get(bdev, mode, holder);
if (err)
return ERR_PTR(err);
return bdev;
}
EXPORT_SYMBOL(blkdev_get_by_dev);
static int blkdev_open(struct inode * inode, struct file * filp)
{
struct block_device *whole = NULL;
struct block_device *bdev;
int res;
/*
* Preserve backwards compatibility and allow large file access
@ -1500,26 +1284,9 @@ static int blkdev_open(struct inode * inode, struct file * filp)
if (bdev == NULL)
return -ENOMEM;
if (filp->f_mode & FMODE_EXCL) {
whole = bd_start_claiming(bdev, filp);
if (IS_ERR(whole)) {
bdput(bdev);
return PTR_ERR(whole);
}
}
filp->f_mapping = bdev->bd_inode->i_mapping;
res = blkdev_get(bdev, filp->f_mode);
if (whole) {
if (res == 0)
bd_finish_claiming(bdev, whole, filp);
else
bd_abort_claiming(whole, filp);
}
return res;
return blkdev_get(bdev, filp->f_mode, filp);
}
static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
@ -1533,6 +1300,7 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
bdev->bd_part_count--;
if (!--bdev->bd_openers) {
WARN_ON_ONCE(bdev->bd_holders);
sync_blockdev(bdev);
kill_bdev(bdev);
}
@ -1563,6 +1331,34 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
int blkdev_put(struct block_device *bdev, fmode_t mode)
{
if (mode & FMODE_EXCL) {
bool bdev_free;
/*
* Release a claim on the device. The holder fields
* are protected with bdev_lock. bd_mutex is to
* synchronize disk_holder unlinking.
*/
mutex_lock(&bdev->bd_mutex);
spin_lock(&bdev_lock);
WARN_ON_ONCE(--bdev->bd_holders < 0);
WARN_ON_ONCE(--bdev->bd_contains->bd_holders < 0);
/* bd_contains might point to self, check in a separate step */
if ((bdev_free = !bdev->bd_holders))
bdev->bd_holder = NULL;
if (!bdev->bd_contains->bd_holders)
bdev->bd_contains->bd_holder = NULL;
spin_unlock(&bdev_lock);
/* if this was the last claim, holder link should go too */
if (bdev_free)
bd_unlink_disk_holder(bdev);
mutex_unlock(&bdev->bd_mutex);
}
return __blkdev_put(bdev, mode, 0);
}
EXPORT_SYMBOL(blkdev_put);
@ -1570,8 +1366,7 @@ EXPORT_SYMBOL(blkdev_put);
static int blkdev_close(struct inode * inode, struct file * filp)
{
struct block_device *bdev = I_BDEV(filp->f_mapping->host);
if (bdev->bd_holder == filp)
bd_release(bdev);
return blkdev_put(bdev, filp->f_mode);
}
@ -1716,67 +1511,6 @@ struct block_device *lookup_bdev(const char *pathname)
}
EXPORT_SYMBOL(lookup_bdev);
/**
* open_bdev_exclusive - open a block device by name and set it up for use
*
* @path: special file representing the block device
* @mode: FMODE_... combination to pass be used
* @holder: owner for exclusion
*
* Open the blockdevice described by the special file at @path, claim it
* for the @holder.
*/
struct block_device *open_bdev_exclusive(const char *path, fmode_t mode, void *holder)
{
struct block_device *bdev, *whole;
int error;
bdev = lookup_bdev(path);
if (IS_ERR(bdev))
return bdev;
whole = bd_start_claiming(bdev, holder);
if (IS_ERR(whole)) {
bdput(bdev);
return whole;
}
error = blkdev_get(bdev, mode);
if (error)
goto out_abort_claiming;
error = -EACCES;
if ((mode & FMODE_WRITE) && bdev_read_only(bdev))
goto out_blkdev_put;
bd_finish_claiming(bdev, whole, holder);
return bdev;
out_blkdev_put:
blkdev_put(bdev, mode);
out_abort_claiming:
bd_abort_claiming(whole, holder);
return ERR_PTR(error);
}
EXPORT_SYMBOL(open_bdev_exclusive);
/**
* close_bdev_exclusive - close a blockdevice opened by open_bdev_exclusive()
*
* @bdev: blockdevice to close
* @mode: mode, must match that used to open.
*
* This is the counterpart to open_bdev_exclusive().
*/
void close_bdev_exclusive(struct block_device *bdev, fmode_t mode)
{
bd_release(bdev);
blkdev_put(bdev, mode);
}
EXPORT_SYMBOL(close_bdev_exclusive);
int __invalidate_device(struct block_device *bdev)
{
struct super_block *sb = get_super(bdev);

28
fs/btrfs/volumes.c
View file

@ -489,7 +489,7 @@ int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices)
continue;
if (device->bdev) {
close_bdev_exclusive(device->bdev, device->mode);
blkdev_put(device->bdev, device->mode);
device->bdev = NULL;
fs_devices->open_devices--;
}
@ -523,7 +523,7 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
list_for_each_entry(device, &fs_devices->devices, dev_list) {
if (device->bdev) {
close_bdev_exclusive(device->bdev, device->mode);
blkdev_put(device->bdev, device->mode);
fs_devices->open_devices--;
}
if (device->writeable) {
@ -580,13 +580,15 @@ static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
int seeding = 1;
int ret = 0;
flags |= FMODE_EXCL;
list_for_each_entry(device, head, dev_list) {
if (device->bdev)
continue;
if (!device->name)
continue;
bdev = open_bdev_exclusive(device->name, flags, holder);
bdev = blkdev_get_by_path(device->name, flags, holder);
if (IS_ERR(bdev)) {
printk(KERN_INFO "open %s failed\n", device->name);
goto error;
@ -638,7 +640,7 @@ static int __btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
error_brelse:
brelse(bh);
error_close:
close_bdev_exclusive(bdev, FMODE_READ);
blkdev_put(bdev, flags);
error:
continue;
}
@ -684,7 +686,8 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
mutex_lock(&uuid_mutex);
bdev = open_bdev_exclusive(path, flags, holder);
flags |= FMODE_EXCL;
bdev = blkdev_get_by_path(path, flags, holder);
if (IS_ERR(bdev)) {
ret = PTR_ERR(bdev);
@ -716,7 +719,7 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
brelse(bh);
error_close:
close_bdev_exclusive(bdev, flags);
blkdev_put(bdev, flags);
error:
mutex_unlock(&uuid_mutex);
return ret;
@ -1179,8 +1182,8 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
goto out;
}
} else {
bdev = open_bdev_exclusive(device_path, FMODE_READ,
root->fs_info->bdev_holder);
bdev = blkdev_get_by_path(device_path, FMODE_READ | FMODE_EXCL,
root->fs_info->bdev_holder);
if (IS_ERR(bdev)) {
ret = PTR_ERR(bdev);
goto out;
@ -1244,7 +1247,7 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
root->fs_info->fs_devices->latest_bdev = next_device->bdev;
if (device->bdev) {
close_bdev_exclusive(device->bdev, device->mode);
blkdev_put(device->bdev, device->mode);
device->bdev = NULL;
device->fs_devices->open_devices--;
}
@ -1287,7 +1290,7 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
brelse(bh);
error_close:
if (bdev)
close_bdev_exclusive(bdev, FMODE_READ);
blkdev_put(bdev, FMODE_READ | FMODE_EXCL);
out:
mutex_unlock(&root->fs_info->volume_mutex);
mutex_unlock(&uuid_mutex);
@ -1439,7 +1442,8 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
if ((sb->s_flags & MS_RDONLY) && !root->fs_info->fs_devices->seeding)
return -EINVAL;
bdev = open_bdev_exclusive(device_path, 0, root->fs_info->bdev_holder);
bdev = blkdev_get_by_path(device_path, FMODE_EXCL,
root->fs_info->bdev_holder);
if (IS_ERR(bdev))
return PTR_ERR(bdev);
@ -1565,7 +1569,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
mutex_unlock(&root->fs_info->volume_mutex);
return ret;
error:
close_bdev_exclusive(bdev, 0);
blkdev_put(bdev, FMODE_EXCL);
if (seeding_dev) {
mutex_unlock(&uuid_mutex);
up_write(&sb->s_umount);

2
fs/btrfs/volumes.h
View file

@ -49,7 +49,7 @@ struct btrfs_device {
struct block_device *bdev;
/* the mode sent to open_bdev_exclusive */
/* the mode sent to blkdev_get */
fmode_t mode;
char *name;

12
fs/ext3/super.c
View file

@ -347,7 +347,7 @@ static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
struct block_device *bdev;
char b[BDEVNAME_SIZE];
bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
if (IS_ERR(bdev))
goto fail;
return bdev;
@ -364,8 +364,7 @@ static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
*/
static int ext3_blkdev_put(struct block_device *bdev)
{
bd_release(bdev);
return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
}
static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
@ -2136,13 +2135,6 @@ static journal_t *ext3_get_dev_journal(struct super_block *sb,
if (bdev == NULL)
return NULL;
if (bd_claim(bdev, sb)) {
ext3_msg(sb, KERN_ERR,
"error: failed to claim external journal device");
blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
return NULL;
}
blocksize = sb->s_blocksize;
hblock = bdev_logical_block_size(bdev);
if (blocksize < hblock) {

12
fs/ext4/super.c
View file

@ -647,7 +647,7 @@ static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
struct block_device *bdev;
char b[BDEVNAME_SIZE];
bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
if (IS_ERR(bdev))
goto fail;
return bdev;
@ -663,8 +663,7 @@ static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
*/
static int ext4_blkdev_put(struct block_device *bdev)
{
bd_release(bdev);
return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
}
static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
@ -3758,13 +3757,6 @@ static journal_t *ext4_get_dev_journal(struct super_block *sb,
if (bdev == NULL)
return NULL;
if (bd_claim(bdev, sb)) {
ext4_msg(sb, KERN_ERR,
"failed to claim external journal device");
blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
return NULL;
}
blocksize = sb->s_blocksize;
hblock = bdev_logical_block_size(bdev);
if (blocksize < hblock) {

8
fs/gfs2/ops_fstype.c
View file

@ -1268,7 +1268,7 @@ static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
{
struct block_device *bdev;
struct super_block *s;
fmode_t mode = FMODE_READ;
fmode_t mode = FMODE_READ | FMODE_EXCL;
int error;
struct gfs2_args args;
struct gfs2_sbd *sdp;
@ -1276,7 +1276,7 @@ static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
if (!(flags & MS_RDONLY))
mode |= FMODE_WRITE;
bdev = open_bdev_exclusive(dev_name, mode, fs_type);
bdev = blkdev_get_by_path(dev_name, mode, fs_type);
if (IS_ERR(bdev))
return ERR_CAST(bdev);
@ -1298,7 +1298,7 @@ static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
goto error_bdev;
if (s->s_root)
close_bdev_exclusive(bdev, mode);
blkdev_put(bdev, mode);
memset(&args, 0, sizeof(args));
args.ar_quota = GFS2_QUOTA_DEFAULT;
@ -1342,7 +1342,7 @@ static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
deactivate_locked_super(s);
return ERR_PTR(error);
error_bdev:
close_bdev_exclusive(bdev, mode);
blkdev_put(bdev, mode);
return ERR_PTR(error);
}

17
fs/jfs/jfs_logmgr.c
View file

@ -1120,16 +1120,13 @@ int lmLogOpen(struct super_block *sb)
* file systems to log may have n-to-1 relationship;
*/
bdev = open_by_devnum(sbi->logdev, FMODE_READ|FMODE_WRITE);
bdev = blkdev_get_by_dev(sbi->logdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
log);
if (IS_ERR(bdev)) {
rc = -PTR_ERR(bdev);
goto free;
}
if ((rc = bd_claim(bdev, log))) {
goto close;
}
log->bdev = bdev;
memcpy(log->uuid, sbi->loguuid, sizeof(log->uuid));
@ -1137,7 +1134,7 @@ int lmLogOpen(struct super_block *sb)
* initialize log:
*/
if ((rc = lmLogInit(log)))
goto unclaim;
goto close;
list_add(&log->journal_list, &jfs_external_logs);
@ -1163,11 +1160,8 @@ int lmLogOpen(struct super_block *sb)
list_del(&log->journal_list);
lbmLogShutdown(log);
unclaim:
bd_release(bdev);
close: /* close external log device */
blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
free: /* free log descriptor */
mutex_unlock(&jfs_log_mutex);
@ -1512,8 +1506,7 @@ int lmLogClose(struct super_block *sb)
bdev = log->bdev;
rc = lmLogShutdown(log);
bd_release(bdev);
blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
kfree(log);

7
fs/logfs/dev_bdev.c
View file

@ -300,7 +300,7 @@ static int bdev_write_sb(struct super_block *sb, struct page *page)
static void bdev_put_device(struct logfs_super *s)
{
close_bdev_exclusive(s->s_bdev, FMODE_READ|FMODE_WRITE);
blkdev_put(s->s_bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
}
static int bdev_can_write_buf(struct super_block *sb, u64 ofs)
@ -325,13 +325,14 @@ int logfs_get_sb_bdev(struct logfs_super *p, struct file_system_type *type,
{
struct block_device *bdev;
bdev = open_bdev_exclusive(devname, FMODE_READ|FMODE_WRITE, type);
bdev = blkdev_get_by_path(devname, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
type);
if (IS_ERR(bdev))
return PTR_ERR(bdev);
if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
int mtdnr = MINOR(bdev->bd_dev);
close_bdev_exclusive(bdev, FMODE_READ|FMODE_WRITE);
blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
return logfs_get_sb_mtd(p, mtdnr);
}

8
fs/nilfs2/super.c
View file

@ -1147,14 +1147,14 @@ nilfs_mount(struct file_system_type *fs_type, int flags,
{
struct nilfs_super_data sd;
struct super_block *s;
fmode_t mode = FMODE_READ;
fmode_t mode = FMODE_READ | FMODE_EXCL;
struct dentry *root_dentry;
int err, s_new = false;
if (!(flags & MS_RDONLY))
mode |= FMODE_WRITE;
sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type);
sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type);
if (IS_ERR(sd.bdev))
return ERR_CAST(sd.bdev);
@ -1233,7 +1233,7 @@ nilfs_mount(struct file_system_type *fs_type, int flags,
}
if (!s_new)
close_bdev_exclusive(sd.bdev, mode);
blkdev_put(sd.bdev, mode);
return root_dentry;
@ -1242,7 +1242,7 @@ nilfs_mount(struct file_system_type *fs_type, int flags,
failed:
if (!s_new)
close_bdev_exclusive(sd.bdev, mode);
blkdev_put(sd.bdev, mode);
return ERR_PTR(err);
}

2
fs/ocfs2/cluster/heartbeat.c
View file

@ -1674,7 +1674,7 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg,
goto out;
reg->hr_bdev = I_BDEV(filp->f_mapping->host);
ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ);
ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ, NULL);
if (ret) {
reg->hr_bdev = NULL;
goto out;

2
fs/partitions/check.c
View file

@ -558,7 +558,7 @@ void register_disk(struct gendisk *disk)
goto exit;
bdev->bd_invalidated = 1;
err = blkdev_get(bdev, FMODE_READ);
err = blkdev_get(bdev, FMODE_READ, NULL);
if (err < 0)
goto exit;
blkdev_put(bdev, FMODE_READ);

21
fs/reiserfs/journal.c
View file

@ -2552,8 +2552,6 @@ static int release_journal_dev(struct super_block *super,
result = 0;
if (journal->j_dev_bd != NULL) {
if (journal->j_dev_bd->bd_dev != super->s_dev)
bd_release(journal->j_dev_bd);
result = blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
journal->j_dev_bd = NULL;
}
@ -2571,7 +2569,7 @@ static int journal_init_dev(struct super_block *super,
{
int result;
dev_t jdev;
fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE;
fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
char b[BDEVNAME_SIZE];
result = 0;
@ -2585,7 +2583,10 @@ static int journal_init_dev(struct super_block *super,
/* there is no "jdev" option and journal is on separate device */
if ((!jdev_name || !jdev_name[0])) {
journal->j_dev_bd = open_by_devnum(jdev, blkdev_mode);
if (jdev == super->s_dev)
blkdev_mode &= ~FMODE_EXCL;
journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
journal);
journal->j_dev_mode = blkdev_mode;
if (IS_ERR(journal->j_dev_bd)) {
result = PTR_ERR(journal->j_dev_bd);
@ -2594,22 +2595,14 @@ static int journal_init_dev(struct super_block *super,
"cannot init journal device '%s': %i",
__bdevname(jdev, b), result);
return result;
} else if (jdev != super->s_dev) {
result = bd_claim(journal->j_dev_bd, journal);
if (result) {
blkdev_put(journal->j_dev_bd, blkdev_mode);
return result;
}
} else if (jdev != super->s_dev)
set_blocksize(journal->j_dev_bd, super->s_blocksize);
}
return 0;
}
journal->j_dev_mode = blkdev_mode;
journal->j_dev_bd = open_bdev_exclusive(jdev_name,
blkdev_mode, journal);
journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
if (IS_ERR(journal->j_dev_bd)) {
result = PTR_ERR(journal->j_dev_bd);
journal->j_dev_bd = NULL;

19
fs/super.c
View file

@ -766,13 +766,13 @@ struct dentry *mount_bdev(struct file_system_type *fs_type,
{
struct block_device *bdev;
struct super_block *s;
fmode_t mode = FMODE_READ;
fmode_t mode = FMODE_READ | FMODE_EXCL;
int error = 0;
if (!(flags & MS_RDONLY))
mode |= FMODE_WRITE;
bdev = open_bdev_exclusive(dev_name, mode, fs_type);
bdev = blkdev_get_by_path(dev_name, mode, fs_type);
if (IS_ERR(bdev))
return ERR_CAST(bdev);
@ -801,13 +801,13 @@ struct dentry *mount_bdev(struct file_system_type *fs_type,
/*
* s_umount nests inside bd_mutex during
* __invalidate_device(). close_bdev_exclusive()
* acquires bd_mutex and can't be called under
* s_umount. Drop s_umount temporarily. This is safe
* as we're holding an active reference.
* __invalidate_device(). blkdev_put() acquires
* bd_mutex and can't be called under s_umount. Drop
* s_umount temporarily. This is safe as we're
* holding an active reference.
*/
up_write(&s->s_umount);
close_bdev_exclusive(bdev, mode);
blkdev_put(bdev, mode);
down_write(&s->s_umount);
} else {
char b[BDEVNAME_SIZE];
@ -831,7 +831,7 @@ struct dentry *mount_bdev(struct file_system_type *fs_type,
error_s:
error = PTR_ERR(s);
error_bdev:
close_bdev_exclusive(bdev, mode);
blkdev_put(bdev, mode);
error:
return ERR_PTR(error);
}
@ -862,7 +862,8 @@ void kill_block_super(struct super_block *sb)
bdev->bd_super = NULL;
generic_shutdown_super(sb);
sync_blockdev(bdev);
close_bdev_exclusive(bdev, mode);
WARN_ON_ONCE(!(mode & FMODE_EXCL));
blkdev_put(bdev, mode | FMODE_EXCL);
}
EXPORT_SYMBOL(kill_block_super);

5
fs/xfs/linux-2.6/xfs_super.c
View file

@ -606,7 +606,8 @@ xfs_blkdev_get(
{
int error = 0;
*bdevp = open_bdev_exclusive(name, FMODE_READ|FMODE_WRITE, mp);
*bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
mp);
if (IS_ERR(*bdevp)) {
error = PTR_ERR(*bdevp);
printk("XFS: Invalid device [%s], error=%d\n", name, error);
@ -620,7 +621,7 @@ xfs_blkdev_put(
struct block_device *bdev)
{
if (bdev)
close_bdev_exclusive(bdev, FMODE_READ|FMODE_WRITE);
blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
}
/*

25
include/linux/fs.h
View file

@ -663,7 +663,7 @@ struct block_device {
void * bd_holder;
int bd_holders;
#ifdef CONFIG_SYSFS
struct list_head bd_holder_list;
struct gendisk * bd_holder_disk; /* for sysfs slave linkng */
#endif
struct block_device * bd_contains;
unsigned bd_block_size;
@ -2006,7 +2006,6 @@ extern struct block_device *bdgrab(struct block_device *bdev);
extern void bd_set_size(struct block_device *, loff_t size);
extern void bd_forget(struct inode *inode);
extern void bdput(struct block_device *);
extern struct block_device *open_by_devnum(dev_t, fmode_t);
extern void invalidate_bdev(struct block_device *);
extern int sync_blockdev(struct block_device *bdev);
extern struct super_block *freeze_bdev(struct block_device *);
@ -2037,16 +2036,20 @@ extern const struct file_operations def_fifo_fops;
extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long);
extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long);
extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long);
extern int blkdev_get(struct block_device *, fmode_t);
extern int blkdev_put(struct block_device *, fmode_t);
extern int bd_claim(struct block_device *, void *);
extern void bd_release(struct block_device *);
extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder);
extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
void *holder);
extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode,
void *holder);
extern int blkdev_put(struct block_device *bdev, fmode_t mode);
#ifdef CONFIG_SYSFS
extern int bd_claim_by_disk(struct block_device *, void *, struct gendisk *);
extern void bd_release_from_disk(struct block_device *, struct gendisk *);
extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
#else
#define bd_claim_by_disk(bdev, holder, disk) bd_claim(bdev, holder)
#define bd_release_from_disk(bdev, disk) bd_release(bdev)
static inline int bd_link_disk_holder(struct block_device *bdev,
struct gendisk *disk)
{
return 0;
}
#endif
#endif
@ -2082,8 +2085,6 @@ static inline void unregister_chrdev(unsigned int major, const char *name)
extern const char *__bdevname(dev_t, char *buffer);
extern const char *bdevname(struct block_device *bdev, char *buffer);
extern struct block_device *lookup_bdev(const char *);
extern struct block_device *open_bdev_exclusive(const char *, fmode_t, void *);
extern void close_bdev_exclusive(struct block_device *, fmode_t);
extern void blkdev_show(struct seq_file *,off_t);
#else

5
kernel/power/swap.c
View file

@ -223,7 +223,7 @@ static int swsusp_swap_check(void)
return res;
root_swap = res;
res = blkdev_get(hib_resume_bdev, FMODE_WRITE);
res = blkdev_get(hib_resume_bdev, FMODE_WRITE, NULL);
if (res)
return res;
@ -907,7 +907,8 @@ int swsusp_check(void)
{
int error;
hib_resume_bdev = open_by_devnum(swsusp_resume_device, FMODE_READ);
hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device,
FMODE_READ, NULL);
if (!IS_ERR(hib_resume_bdev)) {
set_blocksize(hib_resume_bdev, PAGE_SIZE);
clear_page(swsusp_header);

7
mm/swapfile.c
View file

@ -1677,7 +1677,7 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
if (S_ISBLK(inode->i_mode)) {
struct block_device *bdev = I_BDEV(inode);
set_blocksize(bdev, p->old_block_size);
bd_release(bdev);
blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
} else {
mutex_lock(&inode->i_mutex);
inode->i_flags &= ~S_SWAPFILE;
@ -1939,7 +1939,8 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
error = -EINVAL;
if (S_ISBLK(inode->i_mode)) {
bdev = I_BDEV(inode);
error = bd_claim(bdev, sys_swapon);
error = blkdev_get(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL,
sys_swapon);
if (error < 0) {
bdev = NULL;
error = -EINVAL;
@ -2136,7 +2137,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
bad_swap:
if (bdev) {
set_blocksize(bdev, p->old_block_size);
bd_release(bdev);
blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
}
destroy_swap_extents(p);
swap_cgroup_swapoff(type);