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Diffstat (limited to 'fs/btrfs/ioctl.c')
-rw-r--r--fs/btrfs/ioctl.c115
1 files changed, 61 insertions, 54 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index b077544b5232..d60b6caf09e8 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -5,23 +5,18 @@
#include <linux/kernel.h>
#include <linux/bio.h>
-#include <linux/buffer_head.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/fsnotify.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/time.h>
-#include <linux/init.h>
#include <linux/string.h>
#include <linux/backing-dev.h>
#include <linux/mount.h>
-#include <linux/mpage.h>
#include <linux/namei.h>
-#include <linux/swap.h>
#include <linux/writeback.h>
#include <linux/compat.h>
-#include <linux/bit_spinlock.h>
#include <linux/security.h>
#include <linux/xattr.h>
#include <linux/mm.h>
@@ -606,7 +601,7 @@ static noinline int create_subvol(struct inode *dir,
trans->block_rsv = &block_rsv;
trans->bytes_reserved = block_rsv.size;
- ret = btrfs_qgroup_inherit(trans, fs_info, 0, objectid, inherit);
+ ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit);
if (ret)
goto fail;
@@ -616,14 +611,6 @@ static noinline int create_subvol(struct inode *dir,
goto fail;
}
- memzero_extent_buffer(leaf, 0, sizeof(struct btrfs_header));
- btrfs_set_header_bytenr(leaf, leaf->start);
- btrfs_set_header_generation(leaf, trans->transid);
- btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
- btrfs_set_header_owner(leaf, objectid);
-
- write_extent_buffer_fsid(leaf, fs_info->fsid);
- write_extent_buffer_chunk_tree_uuid(leaf, fs_info->chunk_tree_uuid);
btrfs_mark_buffer_dirty(leaf);
inode_item = &root_item->inode;
@@ -711,8 +698,7 @@ static noinline int create_subvol(struct inode *dir,
ret = btrfs_update_inode(trans, root, dir);
BUG_ON(ret);
- ret = btrfs_add_root_ref(trans, fs_info,
- objectid, root->root_key.objectid,
+ ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid,
btrfs_ino(BTRFS_I(dir)), index, name, namelen);
BUG_ON(ret);
@@ -761,6 +747,7 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir,
struct btrfs_pending_snapshot *pending_snapshot;
struct btrfs_trans_handle *trans;
int ret;
+ bool snapshot_force_cow = false;
if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
return -EINVAL;
@@ -777,6 +764,11 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir,
goto free_pending;
}
+ /*
+ * Force new buffered writes to reserve space even when NOCOW is
+ * possible. This is to avoid later writeback (running dealloc) to
+ * fallback to COW mode and unexpectedly fail with ENOSPC.
+ */
atomic_inc(&root->will_be_snapshotted);
smp_mb__after_atomic();
/* wait for no snapshot writes */
@@ -787,6 +779,14 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir,
if (ret)
goto dec_and_free;
+ /*
+ * All previous writes have started writeback in NOCOW mode, so now
+ * we force future writes to fallback to COW mode during snapshot
+ * creation.
+ */
+ atomic_inc(&root->snapshot_force_cow);
+ snapshot_force_cow = true;
+
btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
btrfs_init_block_rsv(&pending_snapshot->block_rsv,
@@ -851,6 +851,8 @@ static int create_snapshot(struct btrfs_root *root, struct inode *dir,
fail:
btrfs_subvolume_release_metadata(fs_info, &pending_snapshot->block_rsv);
dec_and_free:
+ if (snapshot_force_cow)
+ atomic_dec(&root->snapshot_force_cow);
if (atomic_dec_and_test(&root->will_be_snapshotted))
wake_up_var(&root->will_be_snapshotted);
free_pending:
@@ -2507,8 +2509,8 @@ out:
static noinline int btrfs_ioctl_ino_lookup(struct file *file,
void __user *argp)
{
- struct btrfs_ioctl_ino_lookup_args *args;
- struct inode *inode;
+ struct btrfs_ioctl_ino_lookup_args *args;
+ struct inode *inode;
int ret = 0;
args = memdup_user(argp, sizeof(*args));
@@ -2941,8 +2943,14 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
ret = btrfs_defrag_root(root);
break;
case S_IFREG:
- if (!(file->f_mode & FMODE_WRITE)) {
- ret = -EINVAL;
+ /*
+ * Note that this does not check the file descriptor for write
+ * access. This prevents defragmenting executables that are
+ * running and allows defrag on files open in read-only mode.
+ */
+ if (!capable(CAP_SYS_ADMIN) &&
+ inode_permission(inode, MAY_WRITE)) {
+ ret = -EPERM;
goto out;
}
@@ -3165,10 +3173,8 @@ static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
di_args->total_bytes = btrfs_device_get_total_bytes(dev);
memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
if (dev->name) {
- struct rcu_string *name;
-
- name = rcu_dereference(dev->name);
- strncpy(di_args->path, name->str, sizeof(di_args->path) - 1);
+ strncpy(di_args->path, rcu_str_deref(dev->name),
+ sizeof(di_args->path) - 1);
di_args->path[sizeof(di_args->path) - 1] = 0;
} else {
di_args->path[0] = '\0';
@@ -3463,6 +3469,25 @@ static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 olen,
same_lock_start = min_t(u64, loff, dst_loff);
same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start;
+ } else {
+ /*
+ * If the source and destination inodes are different, the
+ * source's range end offset matches the source's i_size, that
+ * i_size is not a multiple of the sector size, and the
+ * destination range does not go past the destination's i_size,
+ * we must round down the length to the nearest sector size
+ * multiple. If we don't do this adjustment we end replacing
+ * with zeroes the bytes in the range that starts at the
+ * deduplication range's end offset and ends at the next sector
+ * size multiple.
+ */
+ if (loff + olen == i_size_read(src) &&
+ dst_loff + len < i_size_read(dst)) {
+ const u64 sz = BTRFS_I(src)->root->fs_info->sectorsize;
+
+ len = round_down(i_size_read(src), sz) - loff;
+ olen = len;
+ }
}
again:
@@ -3602,13 +3627,13 @@ out_unlock:
return ret;
}
-ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
- struct file *dst_file, u64 dst_loff)
+int btrfs_dedupe_file_range(struct file *src_file, loff_t src_loff,
+ struct file *dst_file, loff_t dst_loff,
+ u64 olen)
{
struct inode *src = file_inode(src_file);
struct inode *dst = file_inode(dst_file);
u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
- ssize_t res;
if (WARN_ON_ONCE(bs < PAGE_SIZE)) {
/*
@@ -3619,10 +3644,7 @@ ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
return -EINVAL;
}
- res = btrfs_extent_same(src, loff, olen, dst, dst_loff);
- if (res)
- return res;
- return olen;
+ return btrfs_extent_same(src, src_loff, olen, dst, dst_loff);
}
static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
@@ -5118,9 +5140,7 @@ static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
struct inode *inode = file_inode(file);
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
struct btrfs_ioctl_quota_ctl_args *sa;
- struct btrfs_trans_handle *trans = NULL;
int ret;
- int err;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
@@ -5136,28 +5156,19 @@ static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
}
down_write(&fs_info->subvol_sem);
- trans = btrfs_start_transaction(fs_info->tree_root, 2);
- if (IS_ERR(trans)) {
- ret = PTR_ERR(trans);
- goto out;
- }
switch (sa->cmd) {
case BTRFS_QUOTA_CTL_ENABLE:
- ret = btrfs_quota_enable(trans, fs_info);
+ ret = btrfs_quota_enable(fs_info);
break;
case BTRFS_QUOTA_CTL_DISABLE:
- ret = btrfs_quota_disable(trans, fs_info);
+ ret = btrfs_quota_disable(fs_info);
break;
default:
ret = -EINVAL;
break;
}
- err = btrfs_commit_transaction(trans);
- if (err && !ret)
- ret = err;
-out:
kfree(sa);
up_write(&fs_info->subvol_sem);
drop_write:
@@ -5195,15 +5206,13 @@ static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
}
if (sa->assign) {
- ret = btrfs_add_qgroup_relation(trans, fs_info,
- sa->src, sa->dst);
+ ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst);
} else {
- ret = btrfs_del_qgroup_relation(trans, fs_info,
- sa->src, sa->dst);
+ ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst);
}
/* update qgroup status and info */
- err = btrfs_run_qgroups(trans, fs_info);
+ err = btrfs_run_qgroups(trans);
if (err < 0)
btrfs_handle_fs_error(fs_info, err,
"failed to update qgroup status and info");
@@ -5221,7 +5230,6 @@ drop_write:
static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
{
struct inode *inode = file_inode(file);
- struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_ioctl_qgroup_create_args *sa;
struct btrfs_trans_handle *trans;
@@ -5253,9 +5261,9 @@ static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
}
if (sa->create) {
- ret = btrfs_create_qgroup(trans, fs_info, sa->qgroupid);
+ ret = btrfs_create_qgroup(trans, sa->qgroupid);
} else {
- ret = btrfs_remove_qgroup(trans, fs_info, sa->qgroupid);
+ ret = btrfs_remove_qgroup(trans, sa->qgroupid);
}
err = btrfs_end_transaction(trans);
@@ -5272,7 +5280,6 @@ drop_write:
static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
{
struct inode *inode = file_inode(file);
- struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_ioctl_qgroup_limit_args *sa;
struct btrfs_trans_handle *trans;
@@ -5305,7 +5312,7 @@ static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
qgroupid = root->root_key.objectid;
}
- ret = btrfs_limit_qgroup(trans, fs_info, qgroupid, &sa->lim);
+ ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim);
err = btrfs_end_transaction(trans);
if (err && !ret)
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