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Message-Id: <20210315173716.360726-3-harshadshirwadkar@gmail.com>
Date: Mon, 15 Mar 2021 10:37:12 -0700
From: Harshad Shirwadkar <harshadshirwadkar@...il.com>
To: linux-ext4@...r.kernel.org
Cc: tytso@....edu, Harshad Shirwadkar <harshadshirwadkar@...il.com>
Subject: [PATCH v4 2/6] 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 <harshadshirwadkar@...il.com>
---
fs/ext4/super.c | 50 ++++++++++++++++++++++++++++---------------------
1 file changed, 29 insertions(+), 21 deletions(-)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 071d131fadd8..0491e7a6b04c 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2089,9 +2089,14 @@ 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;
@@ -2248,7 +2253,7 @@ 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;
@@ -2284,7 +2289,7 @@ 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) {
@@ -2293,7 +2298,7 @@ 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],
@@ -2410,8 +2415,7 @@ 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);
@@ -2431,8 +2435,8 @@ 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
@@ -4014,7 +4018,6 @@ 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;
@@ -4025,8 +4028,12 @@ 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;
@@ -4272,8 +4279,7 @@ 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);
@@ -4281,8 +4287,7 @@ 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
@@ -4773,7 +4778,7 @@ 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) &&
@@ -4873,7 +4878,7 @@ 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;
@@ -5808,13 +5813,15 @@ 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;
if (data && !orig_data)
return -ENOMEM;
@@ -5845,7 +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
@@ -5855,7 +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;
}
@@ -5905,7 +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 */
--
2.31.0.rc2.261.g7f71774620-goog
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