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fs: simplify get_filesystem_list / get_all_fs_names

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Just output the '\0' separate list of supported file systems for block
devices directly rather than going through a pointless round of string
manipulation.

Based on an earlier patch from Al Viro <viro@zeniv.linux.org.uk>.

Vivek:
Modified list_bdev_fs_names() and split_fs_names() to return number of
null terminted strings to caller. Callers now use that information to
loop through all the strings instead of relying on one extra null char
being present at the end.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig
2021-07-14 16:23:21 -04:00
committed by Al Viro
parent f9259be6a9
commit 6e7c1770a2
3 changed files with 39 additions and 39 deletions
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27
fs/filesystems.c
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@@ -209,21 +209,28 @@ SYSCALL_DEFINE3(sysfs, int, option, unsigned long, arg1, unsigned long, arg2)
}
#endif
int __init get_filesystem_list(char *buf)
int __init list_bdev_fs_names(char *buf, size_t size)
{
int len = 0;
struct file_system_type * tmp;
struct file_system_type *p;
size_t len;
int count = 0;
read_lock(&file_systems_lock);
tmp = file_systems;
while (tmp && len < PAGE_SIZE - 80) {
len += sprintf(buf+len, "%s\t%s\n",
(tmp->fs_flags & FS_REQUIRES_DEV) ? "" : "nodev",
tmp->name);
tmp = tmp->next;
for (p = file_systems; p; p = p->next) {
if (!(p->fs_flags & FS_REQUIRES_DEV))
continue;
len = strlen(p->name) + 1;
if (len > size) {
pr_warn("%s: truncating file system list\n", __func__);
break;
}
memcpy(buf, p->name, len);
buf += len;
size -= len;
count++;
}
read_unlock(&file_systems_lock);
return len;
return count;
}
#ifdef CONFIG_PROC_FS