[PATCH v3 1/2] btrfs: send: refactor get_inode_info()

From: bingjingc
Date: Fri Aug 12 2022 - 10:43:01 EST

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From: BingJing Chang <bingjingc@xxxxxxxxxxxx>

Refactor get_inode_info() to populate all wanted fields on an output
structure. Besides, also introduce a helper function called
get_inode_gen(), which is majorly used.

Reviewed-by: Robbie Ko <robbieko@xxxxxxxxxxxx>
Signed-off-by: BingJing Chang <bingjingc@xxxxxxxxxxxx>
---
fs/btrfs/send.c | 154 +++++++++++++++++++++++++-----------------------
1 file changed, 79 insertions(+), 75 deletions(-)

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index e7671afcee4f..f8d77a33b9b7 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -842,17 +842,31 @@ static int send_rmdir(struct send_ctx *sctx, struct fs_path *path)
return ret;
}

+struct btrfs_inode_info {
+ u64 size;
+ u64 gen;
+ u64 mode;
+ u64 uid;
+ u64 gid;
+ u64 rdev;
+ u64 attr;
+};
+
/*
* Helper function to retrieve some fields from an inode item.
*/
-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 *fileattr)
+static int get_inode_info(struct btrfs_root *root, u64 ino,
+ struct btrfs_inode_info *info)
{
int ret;
+ struct btrfs_path *path;
struct btrfs_inode_item *ii;
struct btrfs_key key;

+ path = alloc_path_for_send();
+ if (!path)
+ return -ENOMEM;
+
key.objectid = ino;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
@@ -860,47 +874,42 @@ static int __get_inode_info(struct btrfs_root *root, struct btrfs_path *path,
if (ret) {
if (ret > 0)
ret = -ENOENT;
- return ret;
+ goto out;
}

+ if (!info)
+ goto out;
+
ii = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_inode_item);
- if (size)
- *size = btrfs_inode_size(path->nodes[0], ii);
- if (gen)
- *gen = btrfs_inode_generation(path->nodes[0], ii);
- if (mode)
- *mode = btrfs_inode_mode(path->nodes[0], ii);
- if (uid)
- *uid = btrfs_inode_uid(path->nodes[0], ii);
- if (gid)
- *gid = btrfs_inode_gid(path->nodes[0], ii);
- if (rdev)
- *rdev = btrfs_inode_rdev(path->nodes[0], ii);
+ info->size = btrfs_inode_size(path->nodes[0], ii);
+ info->gen = btrfs_inode_generation(path->nodes[0], ii);
+ info->mode = btrfs_inode_mode(path->nodes[0], ii);
+ info->uid = btrfs_inode_uid(path->nodes[0], ii);
+ info->gid = btrfs_inode_gid(path->nodes[0], ii);
+ info->rdev = btrfs_inode_rdev(path->nodes[0], ii);
/*
* Transfer the unchanged u64 value of btrfs_inode_item::flags, that's
* otherwise logically split to 32/32 parts.
*/
- if (fileattr)
- *fileattr = btrfs_inode_flags(path->nodes[0], ii);
+ info->attr = btrfs_inode_flags(path->nodes[0], ii);

+out:
+ btrfs_free_path(path);
return ret;
}

-static int get_inode_info(struct btrfs_root *root,
- u64 ino, u64 *size, u64 *gen,
- u64 *mode, u64 *uid, u64 *gid,
- u64 *rdev, u64 *fileattr)
+static int get_inode_gen(struct btrfs_root *root, u64 ino, u64 *gen)
{
- struct btrfs_path *path;
int ret;
+ struct btrfs_inode_info info;

- path = alloc_path_for_send();
- if (!path)
- return -ENOMEM;
- ret = __get_inode_info(root, path, ino, size, gen, mode, uid, gid,
- rdev, fileattr);
- btrfs_free_path(path);
+ if (!gen)
+ return -EPERM;
+
+ ret = get_inode_info(root, ino, &info);
+ if (!ret)
+ *gen = info.gen;
return ret;
}

@@ -1644,8 +1653,7 @@ static int get_cur_inode_state(struct send_ctx *sctx, u64 ino, u64 gen)
u64 left_gen;
u64 right_gen;

- ret = get_inode_info(sctx->send_root, ino, NULL, &left_gen, NULL, NULL,
- NULL, NULL, NULL);
+ ret = get_inode_gen(sctx->send_root, ino, &left_gen);
if (ret < 0 && ret != -ENOENT)
goto out;
left_ret = ret;
@@ -1653,8 +1661,7 @@ static int get_cur_inode_state(struct send_ctx *sctx, u64 ino, u64 gen)
if (!sctx->parent_root) {
right_ret = -ENOENT;
} else {
- ret = get_inode_info(sctx->parent_root, ino, NULL, &right_gen,
- NULL, NULL, NULL, NULL, NULL);
+ ret = get_inode_gen(sctx->parent_root, ino, &right_gen);
if (ret < 0 && ret != -ENOENT)
goto out;
right_ret = ret;
@@ -1816,8 +1823,7 @@ static int get_first_ref(struct btrfs_root *root, u64 ino,
btrfs_release_path(path);

if (dir_gen) {
- ret = get_inode_info(root, parent_dir, NULL, dir_gen, NULL,
- NULL, NULL, NULL, NULL);
+ ret = get_inode_gen(root, parent_dir, dir_gen);
if (ret < 0)
goto out;
}
@@ -1874,6 +1880,7 @@ static int will_overwrite_ref(struct send_ctx *sctx, u64 dir, u64 dir_gen,
int ret = 0;
u64 gen;
u64 other_inode = 0;
+ struct btrfs_inode_info info;

if (!sctx->parent_root)
goto out;
@@ -1888,8 +1895,7 @@ static int will_overwrite_ref(struct send_ctx *sctx, u64 dir, u64 dir_gen,
* and we can just unlink this entry.
*/
if (sctx->parent_root && dir != BTRFS_FIRST_FREE_OBJECTID) {
- ret = get_inode_info(sctx->parent_root, dir, NULL, &gen, NULL,
- NULL, NULL, NULL, NULL);
+ ret = get_inode_gen(sctx->parent_root, dir, &gen);
if (ret < 0 && ret != -ENOENT)
goto out;
if (ret) {
@@ -1916,13 +1922,14 @@ 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, NULL);
+ ret = get_inode_info(sctx->parent_root, other_inode, &info);
if (ret < 0)
goto out;

ret = 1;
*who_ino = other_inode;
+ *who_gen = info.gen;
+ *who_mode = info.mode;
} else {
ret = 0;
}
@@ -1955,8 +1962,7 @@ static int did_overwrite_ref(struct send_ctx *sctx,
goto out;

if (dir != BTRFS_FIRST_FREE_OBJECTID) {
- ret = get_inode_info(sctx->send_root, dir, NULL, &gen, NULL,
- NULL, NULL, NULL, NULL);
+ ret = get_inode_gen(sctx->send_root, dir, &gen);
if (ret < 0 && ret != -ENOENT)
goto out;
if (ret) {
@@ -1978,8 +1984,7 @@ static int did_overwrite_ref(struct send_ctx *sctx,
goto out;
}

- ret = get_inode_info(sctx->send_root, ow_inode, NULL, &gen, NULL, NULL,
- NULL, NULL, NULL);
+ ret = get_inode_gen(sctx->send_root, ow_inode, &gen);
if (ret < 0)
goto out;

@@ -2645,6 +2650,7 @@ static int send_create_inode(struct send_ctx *sctx, u64 ino)
int ret = 0;
struct fs_path *p;
int cmd;
+ struct btrfs_inode_info info;
u64 gen;
u64 mode;
u64 rdev;
@@ -2656,10 +2662,12 @@ static int send_create_inode(struct send_ctx *sctx, u64 ino)
return -ENOMEM;

if (ino != sctx->cur_ino) {
- ret = get_inode_info(sctx->send_root, ino, NULL, &gen, &mode,
- NULL, NULL, &rdev, NULL);
+ ret = get_inode_info(sctx->send_root, ino, &info);
if (ret < 0)
goto out;
+ gen = info.gen;
+ mode = info.mode;
+ rdev = info.rdev;
} else {
gen = sctx->cur_inode_gen;
mode = sctx->cur_inode_mode;
@@ -3359,8 +3367,7 @@ 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);
+ ret = get_inode_info(sctx->send_root, cur->dir, NULL);
if (ret == -ENOENT) {
ret = 0;
continue;
@@ -3534,12 +3541,10 @@ static int wait_for_dest_dir_move(struct send_ctx *sctx,
goto out;
}

- ret = get_inode_info(sctx->parent_root, di_key.objectid, NULL,
- &left_gen, NULL, NULL, NULL, NULL, NULL);
+ ret = get_inode_gen(sctx->parent_root, di_key.objectid, &left_gen);
if (ret < 0)
goto out;
- ret = get_inode_info(sctx->send_root, di_key.objectid, NULL,
- &right_gen, NULL, NULL, NULL, NULL, NULL);
+ ret = get_inode_gen(sctx->send_root, di_key.objectid, &right_gen);
if (ret < 0) {
if (ret == -ENOENT)
ret = 0;
@@ -3669,8 +3674,7 @@ static int is_ancestor(struct btrfs_root *root,
cur_offset = item_size;
}

- ret = get_inode_info(root, parent, NULL, &parent_gen,
- NULL, NULL, NULL, NULL, NULL);
+ ret = get_inode_gen(root, parent, &parent_gen);
if (ret < 0)
goto out;
ret = check_ino_in_path(root, ino1, ino1_gen,
@@ -3760,9 +3764,8 @@ static int wait_for_parent_move(struct send_ctx *sctx,
memcmp(path_before->start, path_after->start, len1))) {
u64 parent_ino_gen;

- ret = get_inode_info(sctx->parent_root, ino, NULL,
- &parent_ino_gen, NULL, NULL, NULL,
- NULL, NULL);
+ ret = get_inode_gen(sctx->parent_root, ino,
+ &parent_ino_gen);
if (ret < 0)
goto out;
if (ino_gen == parent_ino_gen) {
@@ -4441,8 +4444,7 @@ static int record_new_ref_if_needed(int num, u64 dir, int index,
struct recorded_ref *ref;
u64 dir_gen;

- ret = get_inode_info(sctx->send_root, dir, NULL, &dir_gen, NULL,
- NULL, NULL, NULL, NULL);
+ ret = get_inode_gen(sctx->send_root, dir, &dir_gen);
if (ret < 0)
goto out;

@@ -4472,8 +4474,7 @@ static int record_deleted_ref_if_needed(int num, u64 dir, int index,
struct recorded_ref *ref;
u64 dir_gen;

- ret = get_inode_info(sctx->parent_root, dir, NULL, &dir_gen, NULL,
- NULL, NULL, NULL, NULL);
+ ret = get_inode_gen(sctx->parent_root, dir, &dir_gen);
if (ret < 0)
goto out;

@@ -5056,8 +5057,7 @@ static int send_clone(struct send_ctx *sctx,
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p);

if (clone_root->root == sctx->send_root) {
- ret = get_inode_info(sctx->send_root, clone_root->ino, NULL,
- &gen, NULL, NULL, NULL, NULL, NULL);
+ ret = get_inode_gen(sctx->send_root, clone_root->ino, &gen);
if (ret < 0)
goto out;
ret = get_cur_path(sctx, clone_root->ino, gen, p);
@@ -5536,6 +5536,7 @@ static int clone_range(struct send_ctx *sctx, struct btrfs_path *dst_path,
struct btrfs_path *path;
struct btrfs_key key;
int ret;
+ struct btrfs_inode_info info;
u64 clone_src_i_size = 0;

/*
@@ -5565,12 +5566,11 @@ static int clone_range(struct send_ctx *sctx, struct btrfs_path *dst_path,
* There are inodes that have extents that lie behind its i_size. Don't
* accept clones from these extents.
*/
- ret = __get_inode_info(clone_root->root, path, clone_root->ino,
- &clone_src_i_size, NULL, NULL, NULL, NULL, NULL,
- NULL);
+ ret = get_inode_info(clone_root->root, clone_root->ino, &info);
btrfs_release_path(path);
if (ret < 0)
goto out;
+ clone_src_i_size = info.size;

/*
* We can't send a clone operation for the entire range if we find
@@ -6259,6 +6259,7 @@ static int process_recorded_refs_if_needed(struct send_ctx *sctx, int at_end,
static int finish_inode_if_needed(struct send_ctx *sctx, int at_end)
{
int ret = 0;
+ struct btrfs_inode_info info;
u64 left_mode;
u64 left_uid;
u64 left_gid;
@@ -6301,11 +6302,13 @@ static int finish_inode_if_needed(struct send_ctx *sctx, int at_end)
goto out;
if (!at_end && sctx->cmp_key->objectid == sctx->cur_ino)
goto out;
-
- ret = get_inode_info(sctx->send_root, sctx->cur_ino, NULL, NULL,
- &left_mode, &left_uid, &left_gid, NULL, &left_fileattr);
+ ret = get_inode_info(sctx->send_root, sctx->cur_ino, &info);
if (ret < 0)
goto out;
+ left_mode = info.mode;
+ left_uid = info.uid;
+ left_gid = info.gid;
+ left_fileattr = info.attr;

if (!sctx->parent_root || sctx->cur_inode_new) {
need_chown = 1;
@@ -6316,11 +6319,14 @@ static int finish_inode_if_needed(struct send_ctx *sctx, int at_end)
} else {
u64 old_size;

- ret = get_inode_info(sctx->parent_root, sctx->cur_ino,
- &old_size, NULL, &right_mode, &right_uid,
- &right_gid, NULL, &right_fileattr);
+ ret = get_inode_info(sctx->parent_root, sctx->cur_ino, &info);
if (ret < 0)
goto out;
+ old_size = info.size;
+ right_mode = info.mode;
+ right_uid = info.uid;
+ right_gid = info.gid;
+ right_fileattr = info.attr;

if (left_uid != right_uid || left_gid != right_gid)
need_chown = 1;
@@ -6790,13 +6796,11 @@ static int dir_changed(struct send_ctx *sctx, u64 dir)
u64 orig_gen, new_gen;
int ret;

- ret = get_inode_info(sctx->send_root, dir, NULL, &new_gen, NULL, NULL,
- NULL, NULL, NULL);
+ ret = get_inode_gen(sctx->send_root, dir, &new_gen);
if (ret)
return ret;

- ret = get_inode_info(sctx->parent_root, dir, NULL, &orig_gen, NULL,
- NULL, NULL, NULL, NULL);
+ ret = get_inode_gen(sctx->parent_root, dir, &orig_gen);
if (ret)
return ret;

--
2.37.1

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