The patch titled
Subject: mm/shmem: refactor to reuse vfs_parse_monolithic_sep for option parsing
has been added to the -mm mm-unstable branch. Its filename is
mm-shmem-refactor-to-reuse-vfs_parse_monolithic_sep-for-option-parsing.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-shmem-refactor-to-reuse-vfs_parse_monolithic_sep-for-option-parsing.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Guo Weikang <guoweikang.kernel@xxxxxxxxx>
Subject: mm/shmem: refactor to reuse vfs_parse_monolithic_sep for option parsing
Date: Thu, 5 Dec 2024 17:45:21 +0800
shmem_parse_options() is refactored to use vfs_parse_monolithic_sep() with
a custom separator function, shmem_next_opt(). This eliminates redundant
logic for parsing comma-separated options and ensures consistency with
other kernel code that uses the same interface.
The vfs_parse_monolithic_sep() helper was introduced in commit
e001d1447cd4 ("fs: factor out vfs_parse_monolithic_sep() helper").
Link: https://lkml.kernel.org/r/20241205094521.1244678-1-guoweikang.kernel@xxxxxxxxx
Signed-off-by: Guo Weikang <guoweikang.kernel@xxxxxxxxx>
Cc: Amir Goldstein <amir73il@xxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/shmem.c | 67 +++++++++++++++++++++------------------------------
1 file changed, 28 insertions(+), 39 deletions(-)
--- a/mm/shmem.c~mm-shmem-refactor-to-reuse-vfs_parse_monolithic_sep-for-option-parsing
+++ a/mm/shmem.c
@@ -4644,48 +4644,37 @@ bad_value:
return invalfc(fc, "Bad value for '%s'", param->key);
}
-static int shmem_parse_options(struct fs_context *fc, void *data)
+static char *shmem_next_opt(char **s)
{
- char *options = data;
+ char *sbegin = *s;
+ char *p;
- if (options) {
- int err = security_sb_eat_lsm_opts(options, &fc->security);
- if (err)
- return err;
- }
-
- while (options != NULL) {
- char *this_char = options;
- for (;;) {
- /*
- * NUL-terminate this option: unfortunately,
- * mount options form a comma-separated list,
- * but mpol's nodelist may also contain commas.
- */
- options = strchr(options, ',');
- if (options == NULL)
- break;
- options++;
- if (!isdigit(*options)) {
- options[-1] = '\0';
- break;
- }
- }
- if (*this_char) {
- char *value = strchr(this_char, '=');
- size_t len = 0;
- int err;
-
- if (value) {
- *value++ = '\0';
- len = strlen(value);
- }
- err = vfs_parse_fs_string(fc, this_char, value, len);
- if (err < 0)
- return err;
+ if (sbegin == NULL)
+ return NULL;
+
+ /*
+ * NUL-terminate this option: unfortunately,
+ * mount options form a comma-separated list,
+ * but mpol's nodelist may also contain commas.
+ */
+ for (;;) {
+ p = strchr(*s, ',');
+ if (p == NULL)
+ break;
+ *s = p + 1;
+ if (!isdigit(*(p+1))) {
+ *p = '\0';
+ return sbegin;
}
}
- return 0;
+
+ *s = NULL;
+ return sbegin;
+}
+
+static int shmem_parse_monolithic(struct fs_context *fc, void *data)
+{
+ return vfs_parse_monolithic_sep(fc, data, shmem_next_opt);
}
/*
@@ -5035,7 +5024,7 @@ static const struct fs_context_operation
.free = shmem_free_fc,
.get_tree = shmem_get_tree,
#ifdef CONFIG_TMPFS
- .parse_monolithic = shmem_parse_options,
+ .parse_monolithic = shmem_parse_monolithic,
.parse_param = shmem_parse_one,
.reconfigure = shmem_reconfigure,
#endif
_
Patches currently in -mm which might be from guoweikang.kernel@xxxxxxxxx are
mm-shmem-refactor-to-reuse-vfs_parse_monolithic_sep-for-option-parsing.patch
