From: Howard McLauchlan <hmclauch...@fb.com>
Presently btrfs send/receive does not propagate inode attribute flags;
all chattr operations are effectively discarded upon transmission.
This patch adds kernel support for inode attribute flags. Userspace
support can be found under the commit:
btrfs-progs: add chattr support for send/receive
An associated xfstest can be found at:
btrfs: add verify chattr support for send/receive test
These changes are only enabled for send stream version 2
Signed-off-by: Howard McLauchlan <hmclauch...@fb.com>
---
fs/btrfs/ctree.h | 2 +
fs/btrfs/ioctl.c | 2 +-
fs/btrfs/send.c | 183 +++++++++++++++++++++++++++++++++++++++--------
3 files changed, 158 insertions(+), 29 deletions(-)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 0d422c9908b8..002fe3ad193a 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1461,6 +1461,8 @@ struct btrfs_map_token {
unsigned long offset;
};
+unsigned int btrfs_flags_to_ioctl(unsigned int flags);
+
#define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
((bytes) >> (fs_info)->sb->s_blocksize_bits)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 632e26d6f7ce..36ce1e589f9e 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -106,7 +106,7 @@ static unsigned int btrfs_mask_flags(umode_t mode, unsigned
int flags)
/*
* Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
*/
-static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
+unsigned int btrfs_flags_to_ioctl(unsigned int flags)
{
unsigned int iflags = 0;
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 84dacb20d832..a36a2983b34a 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -108,6 +108,13 @@ struct send_ctx {
u64 cur_inode_last_extent;
u64 cur_inode_next_write_offset;
+ /*
+ * state for chattr purposes
+ */
+ u64 cur_inode_flip_flags;
+ u64 cur_inode_receive_flags;
+ bool receive_flags_valid;
+
u64 send_progress;
u64 total_data_size;
@@ -815,7 +822,7 @@ static int send_rmdir(struct send_ctx *sctx, struct fs_path
*path)
*/
static int __get_inode_info(struct btrfs_root *root, struct btrfs_path *path,
u64 ino, u64 *size, u64 *gen, u64 *mode, u64 *uid,
- u64 *gid, u64 *rdev)
+ u64 *gid, u64 *rdev, u64 *flags)
{
int ret;
struct btrfs_inode_item *ii;
@@ -845,6 +852,8 @@ static int __get_inode_info(struct btrfs_root *root, struct
btrfs_path *path,
*gid = btrfs_inode_gid(path->nodes[0], ii);
if (rdev)
*rdev = btrfs_inode_rdev(path->nodes[0], ii);
+ if (flags)
+ *flags = btrfs_inode_flags(path->nodes[0], ii);
return ret;
}
@@ -852,7 +861,7 @@ static int __get_inode_info(struct btrfs_root *root, struct
btrfs_path *path,
static int get_inode_info(struct btrfs_root *root,
u64 ino, u64 *size, u64 *gen,
u64 *mode, u64 *uid, u64 *gid,
- u64 *rdev)
+ u64 *rdev, u64 *flags)
{
struct btrfs_path *path;
int ret;
@@ -861,7 +870,7 @@ static int get_inode_info(struct btrfs_root *root,
if (!path)
return -ENOMEM;
ret = __get_inode_info(root, path, ino, size, gen, mode, uid, gid,
- rdev);
+ rdev, flags);
btrfs_free_path(path);
return ret;
}
@@ -1250,7 +1259,7 @@ static int __iterate_backrefs(u64 ino, u64 offset, u64
root, void *ctx_)
* accept clones from these extents.
*/
ret = __get_inode_info(found->root, bctx->path, ino, &i_size, NULL,
NULL,
- NULL, NULL, NULL);
+ NULL, NULL, NULL, NULL);
btrfs_release_path(bctx->path);
if (ret < 0)
return ret;
@@ -1610,7 +1619,7 @@ static int get_cur_inode_state(struct send_ctx *sctx, u64
ino, u64 gen)
u64 right_gen;
ret = get_inode_info(sctx->send_root, ino, NULL, &left_gen, NULL, NULL,
- NULL, NULL);
+ NULL, NULL, NULL);
if (ret < 0 && ret != -ENOENT)
goto out;
left_ret = ret;
@@ -1619,7 +1628,7 @@ static int get_cur_inode_state(struct send_ctx *sctx, u64
ino, u64 gen)
right_ret = -ENOENT;
} else {
ret = get_inode_info(sctx->parent_root, ino, NULL, &right_gen,
- NULL, NULL, NULL, NULL);
+ NULL, NULL, NULL, NULL, NULL);
if (ret < 0 && ret != -ENOENT)
goto out;
right_ret = ret;
@@ -1788,7 +1797,7 @@ static int get_first_ref(struct btrfs_root *root, u64 ino,
if (dir_gen) {
ret = get_inode_info(root, parent_dir, NULL, dir_gen, NULL,
- NULL, NULL, NULL);
+ NULL, NULL, NULL, NULL);
if (ret < 0)
goto out;
}
@@ -1861,7 +1870,7 @@ static int will_overwrite_ref(struct send_ctx *sctx, u64
dir, u64 dir_gen,
*/
if (sctx->parent_root && dir != BTRFS_FIRST_FREE_OBJECTID) {
ret = get_inode_info(sctx->parent_root, dir, NULL, &gen, NULL,
- NULL, NULL, NULL);
+ NULL, NULL, NULL, NULL);
if (ret < 0 && ret != -ENOENT)
goto out;
if (ret) {
@@ -1889,7 +1898,7 @@ static int will_overwrite_ref(struct send_ctx *sctx, u64
dir, u64 dir_gen,
if (other_inode > sctx->send_progress ||
is_waiting_for_move(sctx, other_inode)) {
ret = get_inode_info(sctx->parent_root, other_inode, NULL,
- who_gen, who_mode, NULL, NULL, NULL);
+ who_gen, who_mode, NULL, NULL, NULL, NULL);
if (ret < 0)
goto out;
@@ -1929,7 +1938,7 @@ static int did_overwrite_ref(struct send_ctx *sctx,
if (dir != BTRFS_FIRST_FREE_OBJECTID) {
ret = get_inode_info(sctx->send_root, dir, NULL, &gen, NULL,
- NULL, NULL, NULL);
+ NULL, NULL, NULL, NULL);
if (ret < 0 && ret != -ENOENT)
goto out;
if (ret) {
@@ -1952,7 +1961,7 @@ static int did_overwrite_ref(struct send_ctx *sctx,
}
ret = get_inode_info(sctx->send_root, ow_inode, NULL, &gen, NULL, NULL,
- NULL, NULL);
+ NULL, NULL, NULL);
if (ret < 0)
goto out;
@@ -2525,6 +2534,41 @@ static int send_chown(struct send_ctx *sctx, u64 ino,
u64 gen, u64 uid, u64 gid)
return ret;
}
+static int send_chattr(struct send_ctx *sctx, u64 ino, u64 gen, u64 flags)
+{
+ struct btrfs_fs_info *fs_info = sctx->send_root->fs_info;
+ int ret = 0;
+ int __flags;
+ struct fs_path *p;
+
+ ASSERT(sctx->phase != SEND_PHASE_COMPUTE_DATA_SIZE);
+
+ __flags = btrfs_flags_to_ioctl(flags);
+
+ btrfs_debug(fs_info, "send_chattr %llu flags=%llu", ino, flags);
+
+ p = fs_path_alloc();
+ if (!p)
+ return -ENOMEM;
+
+ ret = begin_cmd(sctx, BTRFS_SEND_C_CHATTR);
+ if (ret < 0)
+ goto out;
+
+ ret = get_cur_path(sctx, ino, gen, p);
+ if (ret < 0)
+ goto out;
+ TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p);
+ TLV_PUT_U64(sctx, BTRFS_SEND_A_CHATTR, __flags);
+
+ ret = send_cmd(sctx);
+
+tlv_put_failure:
+out:
+ fs_path_free(p);
+ return ret;
+}
+
static int send_utimes(struct send_ctx *sctx, u64 ino, u64 gen)
{
struct btrfs_fs_info *fs_info = sctx->send_root->fs_info;
@@ -2610,7 +2654,7 @@ static int send_create_inode(struct send_ctx *sctx, u64
ino)
if (ino != sctx->cur_ino) {
ret = get_inode_info(sctx->send_root, ino, NULL, &gen, &mode,
- NULL, NULL, &rdev);
+ NULL, NULL, &rdev, NULL);
if (ret < 0)
goto out;
} else {
@@ -3332,7 +3376,7 @@ static int apply_dir_move(struct send_ctx *sctx, struct
pending_dir_move *pm)
* The parent inode might have been deleted in the send snapshot
*/
ret = get_inode_info(sctx->send_root, cur->dir, NULL,
- NULL, NULL, NULL, NULL, NULL);
+ NULL, NULL, NULL, NULL, NULL, NULL);
if (ret == -ENOENT) {
ret = 0;
continue;
@@ -3502,11 +3546,11 @@ static int wait_for_dest_dir_move(struct send_ctx *sctx,
}
ret = get_inode_info(sctx->parent_root, di_key.objectid, NULL,
- &left_gen, NULL, NULL, NULL, NULL);
+ &left_gen, NULL, NULL, NULL, NULL, NULL);
if (ret < 0)
goto out;
ret = get_inode_info(sctx->send_root, di_key.objectid, NULL,
- &right_gen, NULL, NULL, NULL, NULL);
+ &right_gen, NULL, NULL, NULL, NULL, NULL);
if (ret < 0) {
if (ret == -ENOENT)
ret = 0;
@@ -3650,7 +3694,7 @@ static int is_ancestor(struct btrfs_root *root,
}
ret = get_inode_info(root, parent, NULL, &parent_gen,
- NULL, NULL, NULL, NULL);
+ NULL, NULL, NULL, NULL, NULL);
if (ret < 0)
goto out;
ret = check_ino_in_path(root, ino1, ino1_gen,
@@ -3740,7 +3784,7 @@ static int wait_for_parent_move(struct send_ctx *sctx,
ret = get_inode_info(sctx->parent_root, ino, NULL,
&parent_ino_gen, NULL, NULL, NULL,
- NULL);
+ NULL, NULL);
if (ret < 0)
goto out;
if (ino_gen == parent_ino_gen) {
@@ -4220,7 +4264,7 @@ static int record_ref(struct btrfs_root *root, u64 dir,
struct fs_path *name,
return -ENOMEM;
ret = get_inode_info(root, dir, NULL, &gen, NULL, NULL,
- NULL, NULL);
+ NULL, NULL, NULL);
if (ret < 0)
goto out;
@@ -4308,7 +4352,7 @@ static int __find_iref(int num, u64 dir, int index,
* else matches.
*/
ret = get_inode_info(ctx->root, dir, NULL, &dir_gen, NULL,
- NULL, NULL, NULL);
+ NULL, NULL, NULL, NULL);
if (ret)
return ret;
if (dir_gen != ctx->dir_gen)
@@ -4352,7 +4396,7 @@ static int __record_changed_new_ref(int num, u64 dir, int
index,
struct send_ctx *sctx = ctx;
ret = get_inode_info(sctx->send_root, dir, NULL, &dir_gen, NULL,
- NULL, NULL, NULL);
+ NULL, NULL, NULL, NULL);
if (ret)
return ret;
@@ -4375,7 +4419,7 @@ static int __record_changed_deleted_ref(int num, u64 dir,
int index,
struct send_ctx *sctx = ctx;
ret = get_inode_info(sctx->parent_root, dir, NULL, &dir_gen, NULL,
- NULL, NULL, NULL);
+ NULL, NULL, NULL, NULL);
if (ret)
return ret;
@@ -4975,7 +5019,7 @@ static int send_clone(struct send_ctx *sctx,
if (clone_root->root == sctx->send_root) {
ret = get_inode_info(sctx->send_root, clone_root->ino, NULL,
- &gen, NULL, NULL, NULL, NULL);
+ &gen, NULL, NULL, NULL, NULL, NULL);
if (ret < 0)
goto out;
ret = get_cur_path(sctx, clone_root->ino, gen, p);
@@ -5934,9 +5978,11 @@ static int finish_inode_if_needed(struct send_ctx *sctx,
int at_end)
u64 right_mode;
u64 right_uid;
u64 right_gid;
+ u64 left_flags;
int need_chmod = 0;
int need_chown = 0;
int need_truncate = 1;
+ int need_chattr = 0;
int pending_move = 0;
int refs_processed = 0;
@@ -5944,7 +5990,6 @@ static int finish_inode_if_needed(struct send_ctx *sctx,
int at_end)
&refs_processed);
if (ret < 0)
goto out;
-
/*
* We have processed the refs and thus need to advance send_progress.
* Now, calls to get_cur_xxx will take the updated refs of the current
@@ -5962,6 +6007,65 @@ static int finish_inode_if_needed(struct send_ctx *sctx,
int at_end)
if (sctx->cur_ino == 0 || sctx->cur_inode_deleted)
goto out;
+
+ /*
+ * If possible, we want to know what flags are set for this inode on the
+ * receiving end.
+ */
+ if (sctx->parent_root && !sctx->receive_flags_valid &&
+ (sctx->flags & BTRFS_SEND_FLAG_STREAM_V2)) {
+ ret = get_inode_info(sctx->parent_root, sctx->cur_ino, NULL,
+ NULL, NULL, NULL, NULL, NULL,
+ &sctx->cur_inode_receive_flags);
+ if (ret < 0)
+ goto out;
+ sctx->receive_flags_valid = true;
+ }
+
+ /*
+ * The change is going to modify data and the inode already exists
+ * !at_end prevents unnecessary chattr.
+ */
+ if (!at_end && sctx->parent_root && !sctx->cur_inode_new &&
+ (sctx->cmp_key->type == BTRFS_EXTENT_DATA_KEY ||
+ sctx->cmp_key->type == BTRFS_XATTR_ITEM_KEY) &&
+ (sctx->flags & BTRFS_SEND_FLAG_STREAM_V2) &&
+ sctx->phase != SEND_PHASE_COMPUTE_DATA_SIZE) {
+
+ ret = get_inode_info(sctx->send_root, sctx->cur_ino, NULL, NULL,
+ NULL, NULL, NULL, NULL, &left_flags);
+ if (ret < 0)
+ goto out;
+ /*
+ * We check against the receive flags first; then check against
+ * the left flags to see if we can save a chattr later on
+ */
+ if (sctx->cur_inode_receive_flags & BTRFS_INODE_IMMUTABLE) {
+ sctx->cur_inode_flip_flags |= (left_flags &
+ BTRFS_INODE_IMMUTABLE);
+ left_flags &= ~BTRFS_INODE_IMMUTABLE;
+ need_chattr = 1;
+ }
+ if (sctx->cur_inode_receive_flags & BTRFS_INODE_APPEND) {
+ sctx->cur_inode_flip_flags |= (left_flags &
+ BTRFS_INODE_APPEND);
+ left_flags &= ~BTRFS_INODE_APPEND;
+ need_chattr = 1;
+ }
+ if (need_chattr) {
+ need_chattr = 0;
+ ret = send_chattr(sctx, sctx->cur_ino,
+ sctx->cur_inode_gen, left_flags);
+ if (ret < 0)
+ goto out;
+ /*
+ * left_flags is now an accurate rep of what the
+ * receiving inode's flags are
+ */
+ sctx->cur_inode_receive_flags = left_flags;
+ }
+ }
+
if (!at_end && sctx->cmp_key->objectid == sctx->cur_ino)
goto out;
@@ -5969,7 +6073,7 @@ static int finish_inode_if_needed(struct send_ctx *sctx,
int at_end)
goto truncate_inode;
ret = get_inode_info(sctx->send_root, sctx->cur_ino, NULL, NULL,
- &left_mode, &left_uid, &left_gid, NULL);
+ &left_mode, &left_uid, &left_gid, NULL, &left_flags);
if (ret < 0)
goto out;
@@ -5984,7 +6088,7 @@ static int finish_inode_if_needed(struct send_ctx *sctx,
int at_end)
ret = get_inode_info(sctx->parent_root, sctx->cur_ino,
&old_size, NULL, &right_mode, &right_uid,
- &right_gid, NULL);
+ &right_gid, NULL, NULL);
if (ret < 0)
goto out;
@@ -6015,7 +6119,8 @@ static int finish_inode_if_needed(struct send_ctx *sctx,
int at_end)
goto out;
}
}
- if (need_truncate && !sctx->cur_inode_skip_truncate) {
+ if (sctx->phase != SEND_PHASE_COMPUTE_DATA_SIZE &&
+ need_truncate && !sctx->cur_inode_skip_truncate) {
ret = send_truncate(sctx, sctx->cur_ino,
sctx->cur_inode_gen,
sctx->cur_inode_size);
@@ -6059,6 +6164,28 @@ static int finish_inode_if_needed(struct send_ctx *sctx,
int at_end)
goto out;
}
+ /*
+ * At this point, if we toggled stuff earlier, untoggle it
+ * force a chattr and fix the flags
+ */
+ if (sctx->cur_inode_flip_flags)
+ left_flags |= sctx->cur_inode_flip_flags;
+
+ /*
+ * We either need a chattr because this inode is new, or we need to make
+ * a change due to a discrepancy between left_flags and receive_flags
+ */
+ if ((need_chattr || (sctx->cur_inode_receive_flags != left_flags)) &&
+ (sctx->flags & BTRFS_SEND_FLAG_STREAM_V2) &&
+ sctx->phase != SEND_PHASE_COMPUTE_DATA_SIZE) {
+ ret = send_chattr(sctx, sctx->cur_ino, sctx->cur_inode_gen,
+ left_flags);
+ if (ret < 0)
+ goto out;
+ }
+ sctx->cur_inode_flip_flags = 0;
+ sctx->cur_inode_receive_flags = 0;
+ sctx->receive_flags_valid = false;
out:
return ret;
}
@@ -6379,12 +6506,12 @@ static int dir_changed(struct send_ctx *sctx, u64 dir)
int ret;
ret = get_inode_info(sctx->send_root, dir, NULL, &new_gen, NULL, NULL,
- NULL, NULL);
+ NULL, NULL, NULL);
if (ret)
return ret;
ret = get_inode_info(sctx->parent_root, dir, NULL, &orig_gen, NULL,
- NULL, NULL, NULL);
+ NULL, NULL, NULL, NULL);
if (ret)
return ret;
--
2.17.0
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