#include "props.h"
#include "sysfs.h"
+#ifdef CONFIG_64BIT
+/* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
+ * structures are incorrect, as the timespec structure from userspace
+ * is 4 bytes too small. We define these alternatives here to teach
+ * the kernel about the 32-bit struct packing.
+ */
+struct btrfs_ioctl_timespec_32 {
+ __u64 sec;
+ __u32 nsec;
+} __attribute__ ((__packed__));
+
+struct btrfs_ioctl_received_subvol_args_32 {
+ char uuid[BTRFS_UUID_SIZE]; /* in */
+ __u64 stransid; /* in */
+ __u64 rtransid; /* out */
+ struct btrfs_ioctl_timespec_32 stime; /* in */
+ struct btrfs_ioctl_timespec_32 rtime; /* out */
+ __u64 flags; /* in */
+ __u64 reserved[16]; /* in */
+} __attribute__ ((__packed__));
+
+#define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
+ struct btrfs_ioctl_received_subvol_args_32)
+#endif
+
+
static int btrfs_clone(struct inode *src, struct inode *inode,
u64 off, u64 olen, u64 olen_aligned, u64 destoff);
return ret;
}
+static void btrfs_wait_nocow_write(struct btrfs_root *root)
+{
+ s64 writers;
+ DEFINE_WAIT(wait);
+
+ do {
+ prepare_to_wait(&root->subv_writers->wait, &wait,
+ TASK_UNINTERRUPTIBLE);
+
+ writers = percpu_counter_sum(&root->subv_writers->counter);
+ if (writers)
+ schedule();
+
+ finish_wait(&root->subv_writers->wait, &wait);
+ } while (writers);
+}
+
static int create_snapshot(struct btrfs_root *root, struct inode *dir,
struct dentry *dentry, char *name, int namelen,
u64 *async_transid, bool readonly,
if (!root->ref_cows)
return -EINVAL;
+ atomic_inc(&root->will_be_snapshoted);
+ smp_mb__after_atomic_inc();
+ btrfs_wait_nocow_write(root);
+
ret = btrfs_start_delalloc_inodes(root, 0);
if (ret)
- return ret;
+ goto out;
btrfs_wait_ordered_extents(root, -1);
pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
- if (!pending_snapshot)
- return -ENOMEM;
+ if (!pending_snapshot) {
+ ret = -ENOMEM;
+ goto out;
+ }
btrfs_init_block_rsv(&pending_snapshot->block_rsv,
BTRFS_BLOCK_RSV_TEMP);
&pending_snapshot->qgroup_reserved,
false);
if (ret)
- goto out;
+ goto free;
pending_snapshot->dentry = dentry;
pending_snapshot->root = root;
btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
&pending_snapshot->block_rsv,
pending_snapshot->qgroup_reserved);
-out:
+free:
kfree(pending_snapshot);
+out:
+ atomic_dec(&root->will_be_snapshoted);
return ret;
}
min_key.type = BTRFS_EXTENT_DATA_KEY;
min_key.offset = *off;
- path->keep_locks = 1;
-
while (1) {
+ path->keep_locks = 1;
ret = btrfs_search_forward(root, &min_key, path, newer_than);
if (ret != 0)
goto none;
+ path->keep_locks = 0;
+ btrfs_unlock_up_safe(path, 1);
+process_slot:
if (min_key.objectid != ino)
goto none;
if (min_key.type != BTRFS_EXTENT_DATA_KEY)
return 0;
}
+ path->slots[0]++;
+ if (path->slots[0] < btrfs_header_nritems(leaf)) {
+ btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
+ goto process_slot;
+ }
+
if (min_key.offset == (u64)-1)
goto none;
read_unlock(&em_tree->lock);
if (!em) {
+ struct extent_state *cached = NULL;
+ u64 end = start + len - 1;
+
/* get the big lock and read metadata off disk */
- lock_extent(io_tree, start, start + len - 1);
+ lock_extent_bits(io_tree, start, end, 0, &cached);
em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
- unlock_extent(io_tree, start, start + len - 1);
+ unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS);
if (IS_ERR(em))
return NULL;
return false;
next = defrag_lookup_extent(inode, em->start + em->len);
- if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
+ if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE ||
+ (em->block_start + em->block_len == next->block_start))
ret = false;
free_extent_map(next);
page_start = page_offset(page);
page_end = page_start + PAGE_CACHE_SIZE - 1;
while (1) {
- lock_extent(tree, page_start, page_end);
+ lock_extent_bits(tree, page_start, page_end,
+ 0, &cached_state);
ordered = btrfs_lookup_ordered_extent(inode,
page_start);
- unlock_extent(tree, page_start, page_end);
+ unlock_extent_cached(tree, page_start, page_end,
+ &cached_state, GFP_NOFS);
if (!ordered)
break;
}
}
- if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO))
+ if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
filemap_flush(inode->i_mapping);
+ if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
+ &BTRFS_I(inode)->runtime_flags))
+ filemap_flush(inode->i_mapping);
+ }
if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
/* the filemap_flush will queue IO into the worker threads, but
if (src_inode->i_sb != file_inode(file)->i_sb) {
btrfs_info(BTRFS_I(src_inode)->root->fs_info,
"Snapshot src from another FS");
- ret = -EINVAL;
+ ret = -EXDEV;
} else if (!inode_owner_or_capable(src_inode)) {
/*
* Subvolume creation is not restricted, but snapshots
if (di && !IS_ERR(di)) {
btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key);
if (key.objectid == root->root_key.objectid) {
- ret = -ENOTEMPTY;
+ ret = -EPERM;
+ btrfs_err(root->fs_info, "deleting default subvolume "
+ "%llu is not allowed", key.objectid);
goto out;
}
btrfs_release_path(path);
new_key.offset + datal,
1);
if (ret) {
- btrfs_abort_transaction(trans, root,
- ret);
+ if (ret != -EINVAL)
+ btrfs_abort_transaction(trans,
+ root, ret);
btrfs_end_transaction(trans, root);
goto out;
}
* decompress into destination's address_space (the file offset
* may change, so source mapping won't do), then recompress (or
* otherwise reinsert) a subrange.
- * - allow ranges within the same file to be cloned (provided
- * they don't overlap)?
+ *
+ * - split destination inode's inline extents. The inline extents can
+ * be either compressed or non-compressed.
*/
/* the destination must be opened for writing */
return btrfs_qgroup_wait_for_completion(root->fs_info);
}
-static long btrfs_ioctl_set_received_subvol(struct file *file,
- void __user *arg)
+static long _btrfs_ioctl_set_received_subvol(struct file *file,
+ struct btrfs_ioctl_received_subvol_args *sa)
{
- struct btrfs_ioctl_received_subvol_args *sa = NULL;
struct inode *inode = file_inode(file);
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_root_item *root_item = &root->root_item;
goto out;
}
- sa = memdup_user(arg, sizeof(*sa));
- if (IS_ERR(sa)) {
- ret = PTR_ERR(sa);
- sa = NULL;
- goto out;
- }
-
/*
* 1 - root item
* 2 - uuid items (received uuid + subvol uuid)
goto out;
}
+out:
+ up_write(&root->fs_info->subvol_sem);
+ mnt_drop_write_file(file);
+ return ret;
+}
+
+#ifdef CONFIG_64BIT
+static long btrfs_ioctl_set_received_subvol_32(struct file *file,
+ void __user *arg)
+{
+ struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
+ struct btrfs_ioctl_received_subvol_args *args64 = NULL;
+ int ret = 0;
+
+ args32 = memdup_user(arg, sizeof(*args32));
+ if (IS_ERR(args32)) {
+ ret = PTR_ERR(args32);
+ args32 = NULL;
+ goto out;
+ }
+
+ args64 = kmalloc(sizeof(*args64), GFP_NOFS);
+ if (IS_ERR(args64)) {
+ ret = PTR_ERR(args64);
+ args64 = NULL;
+ goto out;
+ }
+
+ memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
+ args64->stransid = args32->stransid;
+ args64->rtransid = args32->rtransid;
+ args64->stime.sec = args32->stime.sec;
+ args64->stime.nsec = args32->stime.nsec;
+ args64->rtime.sec = args32->rtime.sec;
+ args64->rtime.nsec = args32->rtime.nsec;
+ args64->flags = args32->flags;
+
+ ret = _btrfs_ioctl_set_received_subvol(file, args64);
+ if (ret)
+ goto out;
+
+ memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
+ args32->stransid = args64->stransid;
+ args32->rtransid = args64->rtransid;
+ args32->stime.sec = args64->stime.sec;
+ args32->stime.nsec = args64->stime.nsec;
+ args32->rtime.sec = args64->rtime.sec;
+ args32->rtime.nsec = args64->rtime.nsec;
+ args32->flags = args64->flags;
+
+ ret = copy_to_user(arg, args32, sizeof(*args32));
+ if (ret)
+ ret = -EFAULT;
+
+out:
+ kfree(args32);
+ kfree(args64);
+ return ret;
+}
+#endif
+
+static long btrfs_ioctl_set_received_subvol(struct file *file,
+ void __user *arg)
+{
+ struct btrfs_ioctl_received_subvol_args *sa = NULL;
+ int ret = 0;
+
+ sa = memdup_user(arg, sizeof(*sa));
+ if (IS_ERR(sa)) {
+ ret = PTR_ERR(sa);
+ sa = NULL;
+ goto out;
+ }
+
+ ret = _btrfs_ioctl_set_received_subvol(file, sa);
+
+ if (ret)
+ goto out;
+
ret = copy_to_user(arg, sa, sizeof(*sa));
if (ret)
ret = -EFAULT;
out:
kfree(sa);
- up_write(&root->fs_info->subvol_sem);
- mnt_drop_write_file(file);
return ret;
}
case BTRFS_IOC_SYNC: {
int ret;
- ret = btrfs_start_delalloc_roots(root->fs_info, 0);
+ ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1);
if (ret)
return ret;
ret = btrfs_sync_fs(file->f_dentry->d_sb, 1);
return btrfs_ioctl_balance_progress(root, argp);
case BTRFS_IOC_SET_RECEIVED_SUBVOL:
return btrfs_ioctl_set_received_subvol(file, argp);
+#ifdef CONFIG_64BIT
+ case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
+ return btrfs_ioctl_set_received_subvol_32(file, argp);
+#endif
case BTRFS_IOC_SEND:
return btrfs_ioctl_send(file, argp);
case BTRFS_IOC_GET_DEV_STATS:
projects / cascardo / linux.git / blobdiff