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    Subject[PATCH v2 6/7] ext4: Add mount option for provisioning blocks during allocations
    Date
    Add a mount option that sets the default provisioning mode for
    all files within the filesystem.

    Signed-off-by: Sarthak Kukreti <sarthakkukreti@chromium.org>
    ---
    fs/ext4/ext4.h | 1 +
    fs/ext4/extents.c | 7 +++++++
    fs/ext4/super.c | 7 +++++++
    3 files changed, 15 insertions(+)

    diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
    index 49832e90b62f..29cab2e2ea20 100644
    --- a/fs/ext4/ext4.h
    +++ b/fs/ext4/ext4.h
    @@ -1269,6 +1269,7 @@ struct ext4_inode_info {
    #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group
    * scanning in mballoc
    */
    +#define EXT4_MOUNT2_PROVISION 0x00000100 /* Provision while allocating file blocks */

    #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
    ~EXT4_MOUNT_##opt
    diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
    index 2e64a9211792..a73f44264fe2 100644
    --- a/fs/ext4/extents.c
    +++ b/fs/ext4/extents.c
    @@ -4441,6 +4441,13 @@ static int ext4_alloc_file_blocks(struct file *file, ext4_lblk_t offset,
    unsigned int credits;
    loff_t epos;

    + /*
    + * Attempt to provision file blocks if the mount is mounted with
    + * provision.
    + */
    + if (test_opt2(inode->i_sb, PROVISION))
    + flags |= EXT4_GET_BLOCKS_PROVISION;
    +
    BUG_ON(!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS));
    map.m_lblk = offset;
    map.m_len = len;
    diff --git a/fs/ext4/super.c b/fs/ext4/super.c
    index 260c1b3e3ef2..5bc376f6a6f0 100644
    --- a/fs/ext4/super.c
    +++ b/fs/ext4/super.c
    @@ -1591,6 +1591,7 @@ enum {
    Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
    Opt_no_prefetch_block_bitmaps, Opt_mb_optimize_scan,
    Opt_errors, Opt_data, Opt_data_err, Opt_jqfmt, Opt_dax_type,
    + Opt_provision, Opt_noprovision,
    #ifdef CONFIG_EXT4_DEBUG
    Opt_fc_debug_max_replay, Opt_fc_debug_force
    #endif
    @@ -1737,6 +1738,8 @@ static const struct fs_parameter_spec ext4_param_specs[] = {
    fsparam_flag ("reservation", Opt_removed), /* mount option from ext2/3 */
    fsparam_flag ("noreservation", Opt_removed), /* mount option from ext2/3 */
    fsparam_u32 ("journal", Opt_removed), /* mount option from ext2/3 */
    + fsparam_flag ("provision", Opt_provision),
    + fsparam_flag ("noprovision", Opt_noprovision),
    {}
    };

    @@ -1826,6 +1829,8 @@ static const struct mount_opts {
    {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
    {Opt_no_prefetch_block_bitmaps, EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS,
    MOPT_SET},
    + {Opt_provision, EXT4_MOUNT2_PROVISION, MOPT_SET | MOPT_2},
    + {Opt_noprovision, EXT4_MOUNT2_PROVISION, MOPT_CLEAR | MOPT_2},
    #ifdef CONFIG_EXT4_DEBUG
    {Opt_fc_debug_force, EXT4_MOUNT2_JOURNAL_FAST_COMMIT,
    MOPT_SET | MOPT_2 | MOPT_EXT4_ONLY},
    @@ -2977,6 +2982,8 @@ static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
    SEQ_OPTS_PUTS("dax=never");
    } else if (test_opt2(sb, DAX_INODE)) {
    SEQ_OPTS_PUTS("dax=inode");
    + } else if (test_opt2(sb, PROVISION)) {
    + SEQ_OPTS_PUTS("provision");
    }

    if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD &&
    --
    2.37.3
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