From b237e3044450fcabc6d63d8578b2fbc8237caba3 Mon Sep 17 00:00:00 2001 From: Harshad Shirwadkar Date: Thu, 1 Apr 2021 10:21:24 -0700 Subject: ext4: add ability to return parsed options from parse_options Before this patch, the function parse_options() was returning journal_devnum and journal_ioprio variables to the caller. This patch generalizes that interface to allow parse_options to return any parsed options to return back to the caller. In this patch series, it gets used to capture the value of "mb_optimize_scan=%u" mount option. Signed-off-by: Harshad Shirwadkar Reviewed-by: Ritesh Harjani Link: https://lore.kernel.org/r/20210401172129.189766-3-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o --- fs/ext4/super.c | 51 ++++++++++++++++++++++++++++++--------------------- 1 file changed, 30 insertions(+), 21 deletions(-) (limited to 'fs/ext4/super.c') diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 7b937a84f657..0ef82e646100 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -2090,9 +2090,14 @@ static int ext4_set_test_dummy_encryption(struct super_block *sb, return 1; } +struct ext4_parsed_options { + unsigned long journal_devnum; + unsigned int journal_ioprio; +}; + static int handle_mount_opt(struct super_block *sb, char *opt, int token, - substring_t *args, unsigned long *journal_devnum, - unsigned int *journal_ioprio, int is_remount) + substring_t *args, struct ext4_parsed_options *parsed_opts, + int is_remount) { struct ext4_sb_info *sbi = EXT4_SB(sb); const struct mount_opts *m; @@ -2249,7 +2254,7 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token, "Cannot specify journal on remount"); return -1; } - *journal_devnum = arg; + parsed_opts->journal_devnum = arg; } else if (token == Opt_journal_path) { char *journal_path; struct inode *journal_inode; @@ -2285,7 +2290,7 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token, return -1; } - *journal_devnum = new_encode_dev(journal_inode->i_rdev); + parsed_opts->journal_devnum = new_encode_dev(journal_inode->i_rdev); path_put(&path); kfree(journal_path); } else if (token == Opt_journal_ioprio) { @@ -2294,7 +2299,7 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token, " (must be 0-7)"); return -1; } - *journal_ioprio = + parsed_opts->journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg); } else if (token == Opt_test_dummy_encryption) { return ext4_set_test_dummy_encryption(sb, opt, &args[0], @@ -2411,8 +2416,7 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token, } static int parse_options(char *options, struct super_block *sb, - unsigned long *journal_devnum, - unsigned int *journal_ioprio, + struct ext4_parsed_options *ret_opts, int is_remount) { struct ext4_sb_info __maybe_unused *sbi = EXT4_SB(sb); @@ -2432,8 +2436,8 @@ static int parse_options(char *options, struct super_block *sb, */ args[0].to = args[0].from = NULL; token = match_token(p, tokens, args); - if (handle_mount_opt(sb, p, token, args, journal_devnum, - journal_ioprio, is_remount) < 0) + if (handle_mount_opt(sb, p, token, args, ret_opts, + is_remount) < 0) return 0; } #ifdef CONFIG_QUOTA @@ -4015,7 +4019,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) ext4_fsblk_t sb_block = get_sb_block(&data); ext4_fsblk_t logical_sb_block; unsigned long offset = 0; - unsigned long journal_devnum = 0; unsigned long def_mount_opts; struct inode *root; const char *descr; @@ -4026,8 +4029,12 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) int needs_recovery, has_huge_files; __u64 blocks_count; int err = 0; - unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; ext4_group_t first_not_zeroed; + struct ext4_parsed_options parsed_opts; + + /* Set defaults for the variables that will be set during parsing */ + parsed_opts.journal_ioprio = DEFAULT_JOURNAL_IOPRIO; + parsed_opts.journal_devnum = 0; if ((data && !orig_data) || !sbi) goto out_free_base; @@ -4273,8 +4280,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) GFP_KERNEL); if (!s_mount_opts) goto failed_mount; - if (!parse_options(s_mount_opts, sb, &journal_devnum, - &journal_ioprio, 0)) { + if (!parse_options(s_mount_opts, sb, &parsed_opts, 0)) { ext4_msg(sb, KERN_WARNING, "failed to parse options in superblock: %s", s_mount_opts); @@ -4282,8 +4288,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) kfree(s_mount_opts); } sbi->s_def_mount_opt = sbi->s_mount_opt; - if (!parse_options((char *) data, sb, &journal_devnum, - &journal_ioprio, 0)) + if (!parse_options((char *) data, sb, &parsed_opts, 0)) goto failed_mount; #ifdef CONFIG_UNICODE @@ -4768,7 +4773,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) * root first: it may be modified in the journal! */ if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) { - err = ext4_load_journal(sb, es, journal_devnum); + err = ext4_load_journal(sb, es, parsed_opts.journal_devnum); if (err) goto failed_mount3a; } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) && @@ -4868,7 +4873,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) goto failed_mount_wq; } - set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); + set_task_ioprio(sbi->s_journal->j_task, parsed_opts.journal_ioprio); sbi->s_journal->j_submit_inode_data_buffers = ext4_journal_submit_inode_data_buffers; @@ -5807,13 +5812,16 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data) struct ext4_mount_options old_opts; int enable_quota = 0; ext4_group_t g; - unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; int err = 0; #ifdef CONFIG_QUOTA int i, j; char *to_free[EXT4_MAXQUOTAS]; #endif char *orig_data = kstrdup(data, GFP_KERNEL); + struct ext4_parsed_options parsed_opts; + + parsed_opts.journal_ioprio = DEFAULT_JOURNAL_IOPRIO; + parsed_opts.journal_devnum = 0; if (data && !orig_data) return -ENOMEM; @@ -5844,7 +5852,8 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data) old_opts.s_qf_names[i] = NULL; #endif if (sbi->s_journal && sbi->s_journal->j_task->io_context) - journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; + parsed_opts.journal_ioprio = + sbi->s_journal->j_task->io_context->ioprio; /* * Some options can be enabled by ext4 and/or by VFS mount flag @@ -5854,7 +5863,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data) vfs_flags = SB_LAZYTIME | SB_I_VERSION; sb->s_flags = (sb->s_flags & ~vfs_flags) | (*flags & vfs_flags); - if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) { + if (!parse_options(data, sb, &parsed_opts, 1)) { err = -EINVAL; goto restore_opts; } @@ -5904,7 +5913,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data) if (sbi->s_journal) { ext4_init_journal_params(sb, sbi->s_journal); - set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); + set_task_ioprio(sbi->s_journal->j_task, parsed_opts.journal_ioprio); } /* Flush outstanding errors before changing fs state */ -- cgit v1.2.3-59-g8ed1b