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authorLinus Torvalds <torvalds@linux-foundation.org>2010-12-14 11:08:13 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-12-14 11:08:13 -0800
commite13cf63f2bbd38721af557f0205da994ea068427 (patch)
tree26d0d779fadd58814eea18ab2b16370a8565c837 /fs/btrfs/volumes.c
parent073f21ae1319348f4f8630003b7901e3be254327 (diff)
parent83a50de97fe96aca82389e061862ed760ece2283 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
* git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable: Btrfs: prevent RAID level downgrades when space is low Btrfs: account for missing devices in RAID allocation profiles Btrfs: EIO when we fail to read tree roots Btrfs: fix compiler warnings Btrfs: Make async snapshot ioctl more generic Btrfs: pwrite blocked when writing from the mmaped buffer of the same page Btrfs: Fix a crash when mounting a subvolume Btrfs: fix sync subvol/snapshot creation Btrfs: Fix page leak in compressed writeback path Btrfs: do not BUG if we fail to remove the orphan item for dead snapshots Btrfs: fixup return code for btrfs_del_orphan_item Btrfs: do not do fast caching if we are allocating blocks for tree_root Btrfs: deal with space cache errors better Btrfs: fix use after free in O_DIRECT
Diffstat (limited to 'fs/btrfs/volumes.c')
-rw-r--r--fs/btrfs/volumes.c20
1 files changed, 19 insertions, 1 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index cc04dc1445d..6b988450783 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -412,12 +412,16 @@ static noinline int device_list_add(const char *path,
device->fs_devices = fs_devices;
fs_devices->num_devices++;
- } else if (strcmp(device->name, path)) {
+ } else if (!device->name || strcmp(device->name, path)) {
name = kstrdup(path, GFP_NOFS);
if (!name)
return -ENOMEM;
kfree(device->name);
device->name = name;
+ if (device->missing) {
+ fs_devices->missing_devices--;
+ device->missing = 0;
+ }
}
if (found_transid > fs_devices->latest_trans) {
@@ -1236,6 +1240,9 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
device->fs_devices->num_devices--;
+ if (device->missing)
+ root->fs_info->fs_devices->missing_devices--;
+
next_device = list_entry(root->fs_info->fs_devices->devices.next,
struct btrfs_device, dev_list);
if (device->bdev == root->fs_info->sb->s_bdev)
@@ -3080,7 +3087,9 @@ static struct btrfs_device *add_missing_dev(struct btrfs_root *root,
device->devid = devid;
device->work.func = pending_bios_fn;
device->fs_devices = fs_devices;
+ device->missing = 1;
fs_devices->num_devices++;
+ fs_devices->missing_devices++;
spin_lock_init(&device->io_lock);
INIT_LIST_HEAD(&device->dev_alloc_list);
memcpy(device->uuid, dev_uuid, BTRFS_UUID_SIZE);
@@ -3278,6 +3287,15 @@ static int read_one_dev(struct btrfs_root *root,
device = add_missing_dev(root, devid, dev_uuid);
if (!device)
return -ENOMEM;
+ } else if (!device->missing) {
+ /*
+ * this happens when a device that was properly setup
+ * in the device info lists suddenly goes bad.
+ * device->bdev is NULL, and so we have to set
+ * device->missing to one here
+ */
+ root->fs_info->fs_devices->missing_devices++;
+ device->missing = 1;
}
}