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Date: Fri, 22 May 2015 10:18:42 -0700
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: Jan Kara <jack@...e.cz>
Cc: linux-ext4@...r.kernel.org
Subject: Re: [PATCH 4/4] tune2fs: Add support for orphan_file feature
On Fri, May 22, 2015 at 01:28:57PM +0200, Jan Kara wrote:
> Signed-off-by: Jan Kara <jack@...e.cz>
> ---
> misc/tune2fs.8.in | 5 ++++
> misc/tune2fs.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
> 2 files changed, 84 insertions(+), 2 deletions(-)
>
> diff --git a/misc/tune2fs.8.in b/misc/tune2fs.8.in
> index 9d1df8242baa..c2355da5a7aa 100644
> --- a/misc/tune2fs.8.in
> +++ b/misc/tune2fs.8.in
> @@ -232,6 +232,11 @@ program.
> This superblock setting is only honored in 2.6.35+ kernels;
> and not at all by the ext2 and ext3 file system drivers.
> .TP
> +.BI orphan_file_size= size
> +Set size of the file for tracking unlinked but still open inodes and inodes
> +with truncate in progress. Larger file allows for better scalability, reserving
> +a few blocks per cpu is ideal.
> +.TP
> .B test_fs
> Set a flag in the filesystem superblock indicating that it may be
> mounted using experimental kernel code, such as the ext4dev filesystem.
> diff --git a/misc/tune2fs.c b/misc/tune2fs.c
> index f930df2f6683..672efd5872f8 100644
> --- a/misc/tune2fs.c
> +++ b/misc/tune2fs.c
> @@ -103,6 +103,7 @@ static int fsck_requested;
> int journal_size, journal_flags;
> char *journal_device;
> static blk64_t journal_location = ~0LL;
> +static e2_blkcnt_t orphan_file_blocks;
>
> static struct list_head blk_move_list;
>
> @@ -143,7 +144,8 @@ static void usage(void)
> static __u32 ok_features[3] = {
> /* Compat */
> EXT3_FEATURE_COMPAT_HAS_JOURNAL |
> - EXT2_FEATURE_COMPAT_DIR_INDEX,
> + EXT2_FEATURE_COMPAT_DIR_INDEX |
> + EXT4_FEATURE_COMPAT_ORPHAN_FILE,
> /* Incompat */
> EXT2_FEATURE_INCOMPAT_FILETYPE |
> EXT3_FEATURE_INCOMPAT_EXTENTS |
> @@ -169,7 +171,8 @@ static __u32 clear_ok_features[3] = {
> /* Compat */
> EXT3_FEATURE_COMPAT_HAS_JOURNAL |
> EXT2_FEATURE_COMPAT_RESIZE_INODE |
> - EXT2_FEATURE_COMPAT_DIR_INDEX,
> + EXT2_FEATURE_COMPAT_DIR_INDEX |
> + EXT4_FEATURE_COMPAT_ORPHAN_FILE,
> /* Incompat */
> EXT2_FEATURE_INCOMPAT_FILETYPE |
> EXT4_FEATURE_INCOMPAT_FLEX_BG |
> @@ -1025,6 +1028,44 @@ static int update_feature_set(ext2_filsys fs, char *features)
> }
> }
>
> + if (FEATURE_OFF(E2P_FEATURE_COMPAT, EXT4_FEATURE_COMPAT_ORPHAN_FILE)) {
> + if (mount_flags & EXT2_MF_MOUNTED) {
> + fputs(_("The orphan_file feature may only be cleared "
> + "when the filesystem is unmounted.\n"), stderr);
> + return 1;
> + }
> + if ((sb->s_feature_ro_compat &
> + EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT) &&
> + f_flag < 2) {
> + fputs(_("The orphan_present flag is set. Please run "
> + "e2fsck before clearing orphan_file flag.\n"),
> + stderr);
> + return 1;
> + }
> + err = ext2fs_truncate_orphan_file(fs);
> + if (err) {
> + com_err(program_name, err,
> + _("\n\twhile trying to truncate orhan file\n"));
"orphan"
> + return 1;
> + }
> + }
> +
> + if (FEATURE_ON(E2P_FEATURE_COMPAT, EXT4_FEATURE_COMPAT_ORPHAN_FILE)) {
> + if (!(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
> + fputs(_("orphan_file flag can be set only for "
> + "filesystems with journal.\n"), stderr);
> + return 1;
> + }
> + /*
> + * If adding an orphan file, let the create orphan file
> + * code below handle setting the flag and creating it.
> + * We supply a default size if necessary.
> + */
> + orphan_file_blocks = ext2fs_default_orphan_file_blocks(
> + ext2fs_blocks_count(fs->super));
> + sb->s_feature_compat &= ~EXT4_FEATURE_COMPAT_ORPHAN_FILE;
> + }
> +
> if (FEATURE_ON(E2P_FEATURE_RO_INCOMPAT,
> EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)) {
> if (sb->s_feature_incompat &
> @@ -1970,6 +2011,31 @@ static int parse_extended_opts(ext2_filsys fs, const char *opts)
> continue;
> }
> ext_mount_opts = strdup(arg);
> + } else if (!strcmp(token, "orphan_file_size")) {
> + __u64 size;
> +
> + if (!arg) {
> + r_usage++;
> + continue;
> + }
> + size = strtoul(arg, &p, 0);
Would be nice if I could supply units, e.g. orphan_file_size = 128K here.
> + if (*p) {
> + fprintf(stderr,
> + _("Invalid size of orphan file %s\n"),
> + arg);
> + r_usage++;
> + continue;
> + }
> + if (size < EXT4_MIN_ORPHAN_FILE_SIZE) {
> + fprintf(stderr,
> + _("Orphan file is too small. Minimum "
> + "size is %u\n"),
> + EXT4_MIN_ORPHAN_FILE_SIZE);
> + r_usage++;
> + continue;
> + }
> + orphan_file_blocks = (size + fs->blocksize - 1) /
> + fs->blocksize;
> } else
> r_usage++;
> }
> @@ -2921,6 +2987,17 @@ retry_open:
> if (rc)
> goto closefs;
> }
> + if (orphan_file_blocks) {
If someone specifies -E orphan_file_size=NNN -O ^orphan_file, does this have
the effect of erasing and recreating the orphan file?
--D
> + errcode_t err;
> +
> + err = ext2fs_create_orphan_file(fs, orphan_file_blocks);
> + if (err) {
> + com_err(program_name, err, "%s",
> + _("while creating orphan file"));
> + rc = 1;
> + goto closefs;
> + }
> + }
>
> if (Q_flag) {
> if (mount_flags & EXT2_MF_MOUNTED) {
> --
> 2.1.4
>
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