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    Subject[PATCH 5.15 013/136] btrfs: convert count_max_extents() to use fs_info->max_extent_size
    Date
    From: Naohiro Aota <naohiro.aota@wdc.com>

    commit 7d7672bc5d1038c745716c397d892d21e29de71c upstream

    If count_max_extents() uses BTRFS_MAX_EXTENT_SIZE to calculate the number
    of extents needed, btrfs release the metadata reservation too much on its
    way to write out the data.

    Now that BTRFS_MAX_EXTENT_SIZE is replaced with fs_info->max_extent_size,
    convert count_max_extents() to use it instead, and fix the calculation of
    the metadata reservation.

    CC: stable@vger.kernel.org # 5.12+
    Fixes: d8e3fb106f39 ("btrfs: zoned: use ZONE_APPEND write for zoned mode")
    Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
    Signed-off-by: David Sterba <dsterba@suse.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    fs/btrfs/ctree.h | 21 +++++++++++++--------
    fs/btrfs/delalloc-space.c | 6 +++---
    fs/btrfs/inode.c | 16 ++++++++--------
    3 files changed, 24 insertions(+), 19 deletions(-)

    --- a/fs/btrfs/ctree.h
    +++ b/fs/btrfs/ctree.h
    @@ -105,14 +105,6 @@ struct btrfs_ref;
    #define BTRFS_STAT_CURR 0
    #define BTRFS_STAT_PREV 1

    -/*
    - * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size
    - */
    -static inline u32 count_max_extents(u64 size)
    -{
    - return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
    -}
    -
    static inline unsigned long btrfs_chunk_item_size(int num_stripes)
    {
    BUG_ON(num_stripes == 0);
    @@ -3878,6 +3870,19 @@ static inline bool btrfs_is_zoned(const
    return fs_info->zoned != 0;
    }

    +/*
    + * Count how many fs_info->max_extent_size cover the @size
    + */
    +static inline u32 count_max_extents(struct btrfs_fs_info *fs_info, u64 size)
    +{
    +#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
    + if (!fs_info)
    + return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE);
    +#endif
    +
    + return div_u64(size + fs_info->max_extent_size - 1, fs_info->max_extent_size);
    +}
    +
    static inline bool btrfs_is_data_reloc_root(const struct btrfs_root *root)
    {
    return root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID;
    --- a/fs/btrfs/delalloc-space.c
    +++ b/fs/btrfs/delalloc-space.c
    @@ -273,7 +273,7 @@ static void calc_inode_reservations(stru
    u64 num_bytes, u64 *meta_reserve,
    u64 *qgroup_reserve)
    {
    - u64 nr_extents = count_max_extents(num_bytes);
    + u64 nr_extents = count_max_extents(fs_info, num_bytes);
    u64 csum_leaves = btrfs_csum_bytes_to_leaves(fs_info, num_bytes);
    u64 inode_update = btrfs_calc_metadata_size(fs_info, 1);

    @@ -347,7 +347,7 @@ int btrfs_delalloc_reserve_metadata(stru
    * needs to free the reservation we just made.
    */
    spin_lock(&inode->lock);
    - nr_extents = count_max_extents(num_bytes);
    + nr_extents = count_max_extents(fs_info, num_bytes);
    btrfs_mod_outstanding_extents(inode, nr_extents);
    inode->csum_bytes += num_bytes;
    btrfs_calculate_inode_block_rsv_size(fs_info, inode);
    @@ -410,7 +410,7 @@ void btrfs_delalloc_release_extents(stru
    unsigned num_extents;

    spin_lock(&inode->lock);
    - num_extents = count_max_extents(num_bytes);
    + num_extents = count_max_extents(fs_info, num_bytes);
    btrfs_mod_outstanding_extents(inode, -num_extents);
    btrfs_calculate_inode_block_rsv_size(fs_info, inode);
    spin_unlock(&inode->lock);
    --- a/fs/btrfs/inode.c
    +++ b/fs/btrfs/inode.c
    @@ -2049,10 +2049,10 @@ void btrfs_split_delalloc_extent(struct
    * applies here, just in reverse.
    */
    new_size = orig->end - split + 1;
    - num_extents = count_max_extents(new_size);
    + num_extents = count_max_extents(fs_info, new_size);
    new_size = split - orig->start;
    - num_extents += count_max_extents(new_size);
    - if (count_max_extents(size) >= num_extents)
    + num_extents += count_max_extents(fs_info, new_size);
    + if (count_max_extents(fs_info, size) >= num_extents)
    return;
    }

    @@ -2109,10 +2109,10 @@ void btrfs_merge_delalloc_extent(struct
    * this case.
    */
    old_size = other->end - other->start + 1;
    - num_extents = count_max_extents(old_size);
    + num_extents = count_max_extents(fs_info, old_size);
    old_size = new->end - new->start + 1;
    - num_extents += count_max_extents(old_size);
    - if (count_max_extents(new_size) >= num_extents)
    + num_extents += count_max_extents(fs_info, old_size);
    + if (count_max_extents(fs_info, new_size) >= num_extents)
    return;

    spin_lock(&BTRFS_I(inode)->lock);
    @@ -2191,7 +2191,7 @@ void btrfs_set_delalloc_extent(struct in
    if (!(state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) {
    struct btrfs_root *root = BTRFS_I(inode)->root;
    u64 len = state->end + 1 - state->start;
    - u32 num_extents = count_max_extents(len);
    + u32 num_extents = count_max_extents(fs_info, len);
    bool do_list = !btrfs_is_free_space_inode(BTRFS_I(inode));

    spin_lock(&BTRFS_I(inode)->lock);
    @@ -2233,7 +2233,7 @@ void btrfs_clear_delalloc_extent(struct
    struct btrfs_inode *inode = BTRFS_I(vfs_inode);
    struct btrfs_fs_info *fs_info = btrfs_sb(vfs_inode->i_sb);
    u64 len = state->end + 1 - state->start;
    - u32 num_extents = count_max_extents(len);
    + u32 num_extents = count_max_extents(fs_info, len);

    if ((state->state & EXTENT_DEFRAG) && (*bits & EXTENT_DEFRAG)) {
    spin_lock(&inode->lock);

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