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Diffstat (limited to 'fs/block_dev.c')
-rw-r--r--fs/block_dev.c92
1 files changed, 55 insertions, 37 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 333a7bb4cb9..257b00e9842 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -55,11 +55,13 @@ EXPORT_SYMBOL(I_BDEV);
static void bdev_inode_switch_bdi(struct inode *inode,
struct backing_dev_info *dst)
{
- spin_lock(&inode_lock);
+ spin_lock(&inode_wb_list_lock);
+ spin_lock(&inode->i_lock);
inode->i_data.backing_dev_info = dst;
if (inode->i_state & I_DIRTY)
list_move(&inode->i_wb_list, &dst->wb.b_dirty);
- spin_unlock(&inode_lock);
+ spin_unlock(&inode->i_lock);
+ spin_unlock(&inode_wb_list_lock);
}
static sector_t max_block(struct block_device *bdev)
@@ -651,7 +653,7 @@ void bd_forget(struct inode *inode)
* @whole: whole block device containing @bdev, may equal @bdev
* @holder: holder trying to claim @bdev
*
- * Test whther @bdev can be claimed by @holder.
+ * Test whether @bdev can be claimed by @holder.
*
* CONTEXT:
* spin_lock(&bdev_lock).
@@ -873,6 +875,11 @@ int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk)
ret = add_symlink(bdev->bd_part->holder_dir, &disk_to_dev(disk)->kobj);
if (ret)
goto out_del;
+ /*
+ * bdev could be deleted beneath us which would implicitly destroy
+ * the holder directory. Hold on to it.
+ */
+ kobject_get(bdev->bd_part->holder_dir);
list_add(&holder->list, &bdev->bd_holder_disks);
goto out_unlock;
@@ -909,6 +916,7 @@ void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk)
del_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj);
del_symlink(bdev->bd_part->holder_dir,
&disk_to_dev(disk)->kobj);
+ kobject_put(bdev->bd_part->holder_dir);
list_del_init(&holder->list);
kfree(holder);
}
@@ -922,14 +930,15 @@ EXPORT_SYMBOL_GPL(bd_unlink_disk_holder);
* flush_disk - invalidates all buffer-cache entries on a disk
*
* @bdev: struct block device to be flushed
+ * @kill_dirty: flag to guide handling of dirty inodes
*
* Invalidates all buffer-cache entries on a disk. It should be called
* when a disk has been changed -- either by a media change or online
* resize.
*/
-static void flush_disk(struct block_device *bdev)
+static void flush_disk(struct block_device *bdev, bool kill_dirty)
{
- if (__invalidate_device(bdev)) {
+ if (__invalidate_device(bdev, kill_dirty)) {
char name[BDEVNAME_SIZE] = "";
if (bdev->bd_disk)
@@ -966,7 +975,7 @@ void check_disk_size_change(struct gendisk *disk, struct block_device *bdev)
"%s: detected capacity change from %lld to %lld\n",
name, bdev_size, disk_size);
i_size_write(bdev->bd_inode, disk_size);
- flush_disk(bdev);
+ flush_disk(bdev, false);
}
}
EXPORT_SYMBOL(check_disk_size_change);
@@ -1019,7 +1028,7 @@ int check_disk_change(struct block_device *bdev)
if (!(events & DISK_EVENT_MEDIA_CHANGE))
return 0;
- flush_disk(bdev);
+ flush_disk(bdev, true);
if (bdops->revalidate_disk)
bdops->revalidate_disk(bdev->bd_disk);
return 1;
@@ -1080,6 +1089,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
if (!disk)
goto out;
+ disk_block_events(disk);
mutex_lock_nested(&bdev->bd_mutex, for_part);
if (!bdev->bd_openers) {
bdev->bd_disk = disk;
@@ -1092,6 +1102,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
if (!bdev->bd_part)
goto out_clear;
+ ret = 0;
if (disk->fops->open) {
ret = disk->fops->open(bdev, mode);
if (ret == -ERESTARTSYS) {
@@ -1101,15 +1112,25 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
*/
disk_put_part(bdev->bd_part);
bdev->bd_part = NULL;
- module_put(disk->fops->owner);
- put_disk(disk);
bdev->bd_disk = NULL;
mutex_unlock(&bdev->bd_mutex);
+ disk_unblock_events(disk);
+ module_put(disk->fops->owner);
+ put_disk(disk);
goto restart;
}
- if (ret)
- goto out_clear;
}
+ /*
+ * If the device is invalidated, rescan partition
+ * if open succeeded or failed with -ENOMEDIUM.
+ * The latter is necessary to prevent ghost
+ * partitions on a removed medium.
+ */
+ if (bdev->bd_invalidated && (!ret || ret == -ENOMEDIUM))
+ rescan_partitions(disk, bdev);
+ if (ret)
+ goto out_clear;
+
if (!bdev->bd_openers) {
bd_set_size(bdev,(loff_t)get_capacity(disk)<<9);
bdi = blk_get_backing_dev_info(bdev);
@@ -1117,8 +1138,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
bdi = &default_backing_dev_info;
bdev_inode_switch_bdi(bdev->bd_inode, bdi);
}
- if (bdev->bd_invalidated)
- rescan_partitions(disk, bdev);
} else {
struct block_device *whole;
whole = bdget_disk(disk, 0);
@@ -1141,23 +1160,25 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
bd_set_size(bdev, (loff_t)bdev->bd_part->nr_sects << 9);
}
} else {
- module_put(disk->fops->owner);
- put_disk(disk);
- disk = NULL;
if (bdev->bd_contains == bdev) {
- if (bdev->bd_disk->fops->open) {
+ ret = 0;
+ if (bdev->bd_disk->fops->open)
ret = bdev->bd_disk->fops->open(bdev, mode);
- if (ret)
- goto out_unlock_bdev;
- }
- if (bdev->bd_invalidated)
+ /* the same as first opener case, read comment there */
+ if (bdev->bd_invalidated && (!ret || ret == -ENOMEDIUM))
rescan_partitions(bdev->bd_disk, bdev);
+ if (ret)
+ goto out_unlock_bdev;
}
+ /* only one opener holds refs to the module and disk */
+ module_put(disk->fops->owner);
+ put_disk(disk);
}
bdev->bd_openers++;
if (for_part)
bdev->bd_part_count++;
mutex_unlock(&bdev->bd_mutex);
+ disk_unblock_events(disk);
return 0;
out_clear:
@@ -1170,10 +1191,10 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
bdev->bd_contains = NULL;
out_unlock_bdev:
mutex_unlock(&bdev->bd_mutex);
- out:
- if (disk)
- module_put(disk->fops->owner);
+ disk_unblock_events(disk);
+ module_put(disk->fops->owner);
put_disk(disk);
+ out:
bdput(bdev);
return ret;
@@ -1215,12 +1236,6 @@ int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder)
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 */
mutex_lock(&bdev->bd_mutex);
@@ -1298,6 +1313,11 @@ struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
if (err)
return ERR_PTR(err);
+ if ((mode & FMODE_WRITE) && bdev_read_only(bdev)) {
+ blkdev_put(bdev, mode);
+ return ERR_PTR(-EACCES);
+ }
+
return bdev;
}
EXPORT_SYMBOL(blkdev_get_by_path);
@@ -1440,14 +1460,13 @@ int blkdev_put(struct block_device *bdev, fmode_t mode)
if (bdev_free) {
if (bdev->bd_write_holder) {
disk_unblock_events(bdev->bd_disk);
- bdev->bd_write_holder = false;
- } else
disk_check_events(bdev->bd_disk);
+ bdev->bd_write_holder = false;
+ }
}
mutex_unlock(&bdev->bd_mutex);
- } else
- disk_check_events(bdev->bd_disk);
+ }
return __blkdev_put(bdev, mode, 0);
}
@@ -1521,7 +1540,6 @@ static int blkdev_releasepage(struct page *page, gfp_t wait)
static const struct address_space_operations def_blk_aops = {
.readpage = blkdev_readpage,
.writepage = blkdev_writepage,
- .sync_page = block_sync_page,
.write_begin = blkdev_write_begin,
.write_end = blkdev_write_end,
.writepages = generic_writepages,
@@ -1601,7 +1619,7 @@ fail:
}
EXPORT_SYMBOL(lookup_bdev);
-int __invalidate_device(struct block_device *bdev)
+int __invalidate_device(struct block_device *bdev, bool kill_dirty)
{
struct super_block *sb = get_super(bdev);
int res = 0;
@@ -1614,7 +1632,7 @@ int __invalidate_device(struct block_device *bdev)
* hold).
*/
shrink_dcache_sb(sb);
- res = invalidate_inodes(sb);
+ res = invalidate_inodes(sb, kill_dirty);
drop_super(sb);
}
invalidate_bdev(bdev);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-05-30 20:30:17 +0000