btrfs: preallocate anon block device at first phase of snapshot creation

[BUG]
When the anonymous block device pool is exhausted, subvolume/snapshot
creation fails with EMFILE (Too many files open). This has been reported
by a user. The allocation happens in the second phase during transaction
commit where it's only way out is to abort the transaction

  BTRFS: Transaction aborted (error -24)
  WARNING: CPU: 17 PID: 17041 at fs/btrfs/transaction.c:1576 create_pending_snapshot+0xbc4/0xd10 [btrfs]
  RIP: 0010:create_pending_snapshot+0xbc4/0xd10 [btrfs]
  Call Trace:
   create_pending_snapshots+0x82/0xa0 [btrfs]
   btrfs_commit_transaction+0x275/0x8c0 [btrfs]
   btrfs_mksubvol+0x4b9/0x500 [btrfs]
   btrfs_ioctl_snap_create_transid+0x174/0x180 [btrfs]
   btrfs_ioctl_snap_create_v2+0x11c/0x180 [btrfs]
   btrfs_ioctl+0x11a4/0x2da0 [btrfs]
   do_vfs_ioctl+0xa9/0x640
   ksys_ioctl+0x67/0x90
   __x64_sys_ioctl+0x1a/0x20
   do_syscall_64+0x5a/0x110
   entry_SYSCALL_64_after_hwframe+0x44/0xa9
  ---[ end trace 33f2f83f3d5250e9 ]---
  BTRFS: error (device sda1) in create_pending_snapshot:1576: errno=-24 unknown
  BTRFS info (device sda1): forced readonly
  BTRFS warning (device sda1): Skipping commit of aborted transaction.
  BTRFS: error (device sda1) in cleanup_transaction:1831: errno=-24 unknown

[CAUSE]
When the global anonymous block device pool is exhausted, the following
call chain will fail, and lead to transaction abort:

 btrfs_ioctl_snap_create_v2()
 |- btrfs_ioctl_snap_create_transid()
    |- btrfs_mksubvol()
       |- btrfs_commit_transaction()
          |- create_pending_snapshot()
             |- btrfs_get_fs_root()
                |- btrfs_init_fs_root()
                   |- get_anon_bdev()

[FIX]
Although we can't enlarge the anonymous block device pool, at least we
can preallocate anon_dev for subvolume/snapshot in the first phase,
outside of transaction context and exactly at the moment the user calls
the creation ioctl.

Reported-by: Greed Rong <greedrong@gmail.com>
Link: https://lore.kernel.org/linux-btrfs/CA+UqX+NTrZ6boGnWHhSeZmEY5J76CTqmYjO2S+=tHJX7nb9DPw@mail.gmail.com/
CC: stable@vger.kernel.org # 4.4+
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index c90edf0..9b30703 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1391,7 +1391,12 @@ alloc_fail:
        goto out;
 }
 
-static int btrfs_init_fs_root(struct btrfs_root *root)
+/*
+ * Initialize subvolume root in-memory structure
+ *
+ * @anon_dev:  anonymous device to attach to the root, if zero, allocate new
+ */
+static int btrfs_init_fs_root(struct btrfs_root *root, dev_t anon_dev)
 {
        int ret;
        unsigned int nofs_flag;
@@ -1430,9 +1435,13 @@ static int btrfs_init_fs_root(struct btrfs_root *root)
         */
        if (is_fstree(root->root_key.objectid) &&
            btrfs_root_refs(&root->root_item) > 0) {
-               ret = get_anon_bdev(&root->anon_dev);
-               if (ret)
-                       goto fail;
+               if (!anon_dev) {
+                       ret = get_anon_bdev(&root->anon_dev);
+                       if (ret)
+                               goto fail;
+               } else {
+                       root->anon_dev = anon_dev;
+               }
        }
 
        mutex_lock(&root->objectid_mutex);
@@ -1537,8 +1546,27 @@ void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
 }
 
 
-struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
-                                    u64 objectid, bool check_ref)
+/*
+ * Get an in-memory reference of a root structure.
+ *
+ * For essential trees like root/extent tree, we grab it from fs_info directly.
+ * For subvolume trees, we check the cached filesystem roots first. If not
+ * found, then read it from disk and add it to cached fs roots.
+ *
+ * Caller should release the root by calling btrfs_put_root() after the usage.
+ *
+ * NOTE: Reloc and log trees can't be read by this function as they share the
+ *      same root objectid.
+ *
+ * @objectid:  root id
+ * @anon_dev:  preallocated anonymous block device number for new roots,
+ *             pass 0 for new allocation.
+ * @check_ref: whether to check root item references, If true, return -ENOENT
+ *             for orphan roots
+ */
+static struct btrfs_root *btrfs_get_root_ref(struct btrfs_fs_info *fs_info,
+                                            u64 objectid, dev_t anon_dev,
+                                            bool check_ref)
 {
        struct btrfs_root *root;
        struct btrfs_path *path;
@@ -1567,6 +1595,8 @@ struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
 again:
        root = btrfs_lookup_fs_root(fs_info, objectid);
        if (root) {
+               /* Shouldn't get preallocated anon_dev for cached roots */
+               ASSERT(!anon_dev);
                if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
                        btrfs_put_root(root);
                        return ERR_PTR(-ENOENT);
@@ -1586,7 +1616,7 @@ again:
                goto fail;
        }
 
-       ret = btrfs_init_fs_root(root);
+       ret = btrfs_init_fs_root(root, anon_dev);
        if (ret)
                goto fail;
 
@@ -1619,6 +1649,33 @@ fail:
        return ERR_PTR(ret);
 }
 
+/*
+ * Get in-memory reference of a root structure
+ *
+ * @objectid:  tree objectid
+ * @check_ref: if set, verify that the tree exists and the item has at least
+ *             one reference
+ */
+struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
+                                    u64 objectid, bool check_ref)
+{
+       return btrfs_get_root_ref(fs_info, objectid, 0, check_ref);
+}
+
+/*
+ * Get in-memory reference of a root structure, created as new, optionally pass
+ * the anonymous block device id
+ *
+ * @objectid:  tree objectid
+ * @anon_dev:  if zero, allocate a new anonymous block device or use the
+ *             parameter value
+ */
+struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
+                                        u64 objectid, dev_t anon_dev)
+{
+       return btrfs_get_root_ref(fs_info, objectid, anon_dev, true);
+}
+
 static int btrfs_congested_fn(void *congested_data, int bdi_bits)
 {
        struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;

diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index bf43245..00dc39d 100644 (file)
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -67,6 +67,8 @@ void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
 
 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
                                     u64 objectid, bool check_ref);
+struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
+                                        u64 objectid, dev_t anon_dev);
 
 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 4adfdfa..ab34179 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -566,6 +566,7 @@ static noinline int create_subvol(struct inode *dir,
        struct inode *inode;
        int ret;
        int err;
+       dev_t anon_dev = 0;
        u64 objectid;
        u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
        u64 index = 0;
@@ -578,6 +579,10 @@ static noinline int create_subvol(struct inode *dir,
        if (ret)
                goto fail_free;
 
+       ret = get_anon_bdev(&anon_dev);
+       if (ret < 0)
+               goto fail_free;
+
        /*
         * Don't create subvolume whose level is not zero. Or qgroup will be
         * screwed up since it assumes subvolume qgroup's level to be 0.
@@ -660,12 +665,15 @@ static noinline int create_subvol(struct inode *dir,
                goto fail;
 
        key.offset = (u64)-1;
-       new_root = btrfs_get_fs_root(fs_info, objectid, true);
+       new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev);
        if (IS_ERR(new_root)) {
+               free_anon_bdev(anon_dev);
                ret = PTR_ERR(new_root);
                btrfs_abort_transaction(trans, ret);
                goto fail;
        }
+       /* Freeing will be done in btrfs_put_root() of new_root */
+       anon_dev = 0;
 
        btrfs_record_root_in_trans(trans, new_root);
 
@@ -735,6 +743,8 @@ fail:
        return ret;
 
 fail_free:
+       if (anon_dev)
+               free_anon_bdev(anon_dev);
        kfree(root_item);
        return ret;
 }
@@ -762,6 +772,9 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir,
        if (!pending_snapshot)
                return -ENOMEM;
 
+       ret = get_anon_bdev(&pending_snapshot->anon_dev);
+       if (ret < 0)
+               goto free_pending;
        pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
                        GFP_KERNEL);
        pending_snapshot->path = btrfs_alloc_path();
@@ -823,10 +836,16 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir,
 
        d_instantiate(dentry, inode);
        ret = 0;
+       pending_snapshot->anon_dev = 0;
 fail:
+       /* Prevent double freeing of anon_dev */
+       if (ret && pending_snapshot->snap)
+               pending_snapshot->snap->anon_dev = 0;
        btrfs_put_root(pending_snapshot->snap);
        btrfs_subvolume_release_metadata(fs_info, &pending_snapshot->block_rsv);
 free_pending:
+       if (pending_snapshot->anon_dev)
+               free_anon_bdev(pending_snapshot->anon_dev);
        kfree(pending_snapshot->root_item);
        btrfs_free_path(pending_snapshot->path);
        kfree(pending_snapshot);

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index b359d4b..3a7c392 100644 (file)
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1630,7 +1630,7 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
        }
 
        key.offset = (u64)-1;
-       pending->snap = btrfs_get_fs_root(fs_info, objectid, true);
+       pending->snap = btrfs_get_new_fs_root(fs_info, objectid, pending->anon_dev);
        if (IS_ERR(pending->snap)) {
                ret = PTR_ERR(pending->snap);
                btrfs_abort_transaction(trans, ret);

diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h
index 6f65fff..98f7860 100644 (file)
--- a/fs/btrfs/transaction.h
+++ b/fs/btrfs/transaction.h
@@ -151,6 +151,8 @@ struct btrfs_pending_snapshot {
        struct btrfs_block_rsv block_rsv;
        /* extra metadata reservation for relocation */
        int error;
+       /* Preallocated anonymous block device number */
+       dev_t anon_dev;
        bool readonly;
        struct list_head list;
 };