diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/ctree.h | 6 | ||||
| -rw-r--r-- | fs/btrfs/ioctl.c | 19 | ||||
| -rw-r--r-- | fs/btrfs/send.c | 26 |
3 files changed, 50 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index b19c7d65fe7d..aeaadeebc1fd 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1340,6 +1340,12 @@ struct btrfs_root { * manipulation with the read-only status via SUBVOL_SETFLAGS */ int send_in_progress; + /* + * Number of currently running deduplication operations that have a + * destination inode belonging to this root. Protected by the lock + * root_item_lock. + */ + int dedupe_in_progress; struct btrfs_subvolume_writers *subv_writers; atomic_t will_be_snapshotted; atomic_t snapshot_force_cow; diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 19b0ee4e2c70..7755b503b348 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -3262,6 +3262,19 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, { int ret; u64 i, tail_len, chunk_count; + struct btrfs_root *root_dst = BTRFS_I(dst)->root; + + spin_lock(&root_dst->root_item_lock); + if (root_dst->send_in_progress) { + btrfs_warn_rl(root_dst->fs_info, +"cannot deduplicate to root %llu while send operations are using it (%d in progress)", + root_dst->root_key.objectid, + root_dst->send_in_progress); + spin_unlock(&root_dst->root_item_lock); + return -EAGAIN; + } + root_dst->dedupe_in_progress++; + spin_unlock(&root_dst->root_item_lock); tail_len = olen % BTRFS_MAX_DEDUPE_LEN; chunk_count = div_u64(olen, BTRFS_MAX_DEDUPE_LEN); @@ -3270,7 +3283,7 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, ret = btrfs_extent_same_range(src, loff, BTRFS_MAX_DEDUPE_LEN, dst, dst_loff); if (ret) - return ret; + goto out; loff += BTRFS_MAX_DEDUPE_LEN; dst_loff += BTRFS_MAX_DEDUPE_LEN; @@ -3279,6 +3292,10 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, if (tail_len > 0) ret = btrfs_extent_same_range(src, loff, tail_len, dst, dst_loff); +out: + spin_lock(&root_dst->root_item_lock); + root_dst->dedupe_in_progress--; + spin_unlock(&root_dst->root_item_lock); return ret; } diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index 12363081f53b..dd38dfe174df 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -6640,6 +6640,13 @@ static void btrfs_root_dec_send_in_progress(struct btrfs_root* root) spin_unlock(&root->root_item_lock); } +static void dedupe_in_progress_warn(const struct btrfs_root *root) +{ + btrfs_warn_rl(root->fs_info, +"cannot use root %llu for send while deduplications on it are in progress (%d in progress)", + root->root_key.objectid, root->dedupe_in_progress); +} + long btrfs_ioctl_send(struct file *mnt_file, struct btrfs_ioctl_send_args *arg) { int ret = 0; @@ -6663,6 +6670,11 @@ long btrfs_ioctl_send(struct file *mnt_file, struct btrfs_ioctl_send_args *arg) * making it RW. This also protects against deletion. */ spin_lock(&send_root->root_item_lock); + if (btrfs_root_readonly(send_root) && send_root->dedupe_in_progress) { + dedupe_in_progress_warn(send_root); + spin_unlock(&send_root->root_item_lock); + return -EAGAIN; + } send_root->send_in_progress++; spin_unlock(&send_root->root_item_lock); @@ -6797,6 +6809,13 @@ long btrfs_ioctl_send(struct file *mnt_file, struct btrfs_ioctl_send_args *arg) ret = -EPERM; goto out; } + if (clone_root->dedupe_in_progress) { + dedupe_in_progress_warn(clone_root); + spin_unlock(&clone_root->root_item_lock); + srcu_read_unlock(&fs_info->subvol_srcu, index); + ret = -EAGAIN; + goto out; + } clone_root->send_in_progress++; spin_unlock(&clone_root->root_item_lock); srcu_read_unlock(&fs_info->subvol_srcu, index); @@ -6831,6 +6850,13 @@ long btrfs_ioctl_send(struct file *mnt_file, struct btrfs_ioctl_send_args *arg) ret = -EPERM; goto out; } + if (sctx->parent_root->dedupe_in_progress) { + dedupe_in_progress_warn(sctx->parent_root); + spin_unlock(&sctx->parent_root->root_item_lock); + srcu_read_unlock(&fs_info->subvol_srcu, index); + ret = -EAGAIN; + goto out; + } spin_unlock(&sctx->parent_root->root_item_lock); srcu_read_unlock(&fs_info->subvol_srcu, index); |