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Date: Fri, 12 Aug 2022 17:20:29 +0100
From: Filipe Manana <fdmanana@...nel.org>
To: bingjingc <bingjingc@...ology.com>
Cc: josef@...icpanda.com, dsterba@...e.com, clm@...com,
linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
robbieko@...ology.com, bxxxjxxg@...il.com
Subject: Re: [PATCH v3 1/2] btrfs: send: refactor get_inode_info()
On Fri, Aug 12, 2022 at 3:42 PM bingjingc <bingjingc@...ology.com> wrote:
>
> From: BingJing Chang <bingjingc@...ology.com>
>
> 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@...ology.com>
> Signed-off-by: BingJing Chang <bingjingc@...ology.com>
Reviewed-by: Filipe Manana <fdmanana@...e.com>
Looks good, thanks.
> ---
> 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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