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authorSrikant Patnaik2015-01-11 12:28:04 +0530
committerSrikant Patnaik2015-01-11 12:28:04 +0530
commit871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch)
tree8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/fs/filesystems.c
parent9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff)
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/fs/filesystems.c')
-rw-r--r--ANDROID_3.4.5/fs/filesystems.c286
1 files changed, 0 insertions, 286 deletions
diff --git a/ANDROID_3.4.5/fs/filesystems.c b/ANDROID_3.4.5/fs/filesystems.c
deleted file mode 100644
index 96f24286..00000000
--- a/ANDROID_3.4.5/fs/filesystems.c
+++ /dev/null
@@ -1,286 +0,0 @@
-/*
- * linux/fs/filesystems.c
- *
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * table of configured filesystems
- */
-
-#include <linux/syscalls.h>
-#include <linux/fs.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include <linux/kmod.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <asm/uaccess.h>
-
-/*
- * Handling of filesystem drivers list.
- * Rules:
- * Inclusion to/removals from/scanning of list are protected by spinlock.
- * During the unload module must call unregister_filesystem().
- * We can access the fields of list element if:
- * 1) spinlock is held or
- * 2) we hold the reference to the module.
- * The latter can be guaranteed by call of try_module_get(); if it
- * returned 0 we must skip the element, otherwise we got the reference.
- * Once the reference is obtained we can drop the spinlock.
- */
-
-static struct file_system_type *file_systems;
-static DEFINE_RWLOCK(file_systems_lock);
-
-/* WARNING: This can be used only if we _already_ own a reference */
-void get_filesystem(struct file_system_type *fs)
-{
- __module_get(fs->owner);
-}
-
-void put_filesystem(struct file_system_type *fs)
-{
- module_put(fs->owner);
-}
-
-static struct file_system_type **find_filesystem(const char *name, unsigned len)
-{
- struct file_system_type **p;
- for (p=&file_systems; *p; p=&(*p)->next)
- if (strlen((*p)->name) == len &&
- strncmp((*p)->name, name, len) == 0)
- break;
- return p;
-}
-
-/**
- * register_filesystem - register a new filesystem
- * @fs: the file system structure
- *
- * Adds the file system passed to the list of file systems the kernel
- * is aware of for mount and other syscalls. Returns 0 on success,
- * or a negative errno code on an error.
- *
- * The &struct file_system_type that is passed is linked into the kernel
- * structures and must not be freed until the file system has been
- * unregistered.
- */
-
-int register_filesystem(struct file_system_type * fs)
-{
- int res = 0;
- struct file_system_type ** p;
-
- BUG_ON(strchr(fs->name, '.'));
- if (fs->next)
- return -EBUSY;
- write_lock(&file_systems_lock);
- p = find_filesystem(fs->name, strlen(fs->name));
- if (*p)
- res = -EBUSY;
- else
- *p = fs;
- write_unlock(&file_systems_lock);
- return res;
-}
-
-EXPORT_SYMBOL(register_filesystem);
-
-/**
- * unregister_filesystem - unregister a file system
- * @fs: filesystem to unregister
- *
- * Remove a file system that was previously successfully registered
- * with the kernel. An error is returned if the file system is not found.
- * Zero is returned on a success.
- *
- * Once this function has returned the &struct file_system_type structure
- * may be freed or reused.
- */
-
-int unregister_filesystem(struct file_system_type * fs)
-{
- struct file_system_type ** tmp;
-
- write_lock(&file_systems_lock);
- tmp = &file_systems;
- while (*tmp) {
- if (fs == *tmp) {
- *tmp = fs->next;
- fs->next = NULL;
- write_unlock(&file_systems_lock);
- synchronize_rcu();
- return 0;
- }
- tmp = &(*tmp)->next;
- }
- write_unlock(&file_systems_lock);
-
- return -EINVAL;
-}
-
-EXPORT_SYMBOL(unregister_filesystem);
-
-static int fs_index(const char __user * __name)
-{
- struct file_system_type * tmp;
- char * name;
- int err, index;
-
- name = getname(__name);
- err = PTR_ERR(name);
- if (IS_ERR(name))
- return err;
-
- err = -EINVAL;
- read_lock(&file_systems_lock);
- for (tmp=file_systems, index=0 ; tmp ; tmp=tmp->next, index++) {
- if (strcmp(tmp->name,name) == 0) {
- err = index;
- break;
- }
- }
- read_unlock(&file_systems_lock);
- putname(name);
- return err;
-}
-
-static int fs_name(unsigned int index, char __user * buf)
-{
- struct file_system_type * tmp;
- int len, res;
-
- read_lock(&file_systems_lock);
- for (tmp = file_systems; tmp; tmp = tmp->next, index--)
- if (index <= 0 && try_module_get(tmp->owner))
- break;
- read_unlock(&file_systems_lock);
- if (!tmp)
- return -EINVAL;
-
- /* OK, we got the reference, so we can safely block */
- len = strlen(tmp->name) + 1;
- res = copy_to_user(buf, tmp->name, len) ? -EFAULT : 0;
- put_filesystem(tmp);
- return res;
-}
-
-static int fs_maxindex(void)
-{
- struct file_system_type * tmp;
- int index;
-
- read_lock(&file_systems_lock);
- for (tmp = file_systems, index = 0 ; tmp ; tmp = tmp->next, index++)
- ;
- read_unlock(&file_systems_lock);
- return index;
-}
-
-/*
- * Whee.. Weird sysv syscall.
- */
-SYSCALL_DEFINE3(sysfs, int, option, unsigned long, arg1, unsigned long, arg2)
-{
- int retval = -EINVAL;
-
- switch (option) {
- case 1:
- retval = fs_index((const char __user *) arg1);
- break;
-
- case 2:
- retval = fs_name(arg1, (char __user *) arg2);
- break;
-
- case 3:
- retval = fs_maxindex();
- break;
- }
- return retval;
-}
-
-int __init get_filesystem_list(char *buf)
-{
- int len = 0;
- struct file_system_type * tmp;
-
- 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;
- }
- read_unlock(&file_systems_lock);
- return len;
-}
-
-#ifdef CONFIG_PROC_FS
-static int filesystems_proc_show(struct seq_file *m, void *v)
-{
- struct file_system_type * tmp;
-
- read_lock(&file_systems_lock);
- tmp = file_systems;
- while (tmp) {
- seq_printf(m, "%s\t%s\n",
- (tmp->fs_flags & FS_REQUIRES_DEV) ? "" : "nodev",
- tmp->name);
- tmp = tmp->next;
- }
- read_unlock(&file_systems_lock);
- return 0;
-}
-
-static int filesystems_proc_open(struct inode *inode, struct file *file)
-{
- return single_open(file, filesystems_proc_show, NULL);
-}
-
-static const struct file_operations filesystems_proc_fops = {
- .open = filesystems_proc_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static int __init proc_filesystems_init(void)
-{
- proc_create("filesystems", 0, NULL, &filesystems_proc_fops);
- return 0;
-}
-module_init(proc_filesystems_init);
-#endif
-
-static struct file_system_type *__get_fs_type(const char *name, int len)
-{
- struct file_system_type *fs;
-
- read_lock(&file_systems_lock);
- fs = *(find_filesystem(name, len));
- if (fs && !try_module_get(fs->owner))
- fs = NULL;
- read_unlock(&file_systems_lock);
- return fs;
-}
-
-struct file_system_type *get_fs_type(const char *name)
-{
- struct file_system_type *fs;
- const char *dot = strchr(name, '.');
- int len = dot ? dot - name : strlen(name);
-
- fs = __get_fs_type(name, len);
- if (!fs && (request_module("%.*s", len, name) == 0))
- fs = __get_fs_type(name, len);
-
- if (dot && fs && !(fs->fs_flags & FS_HAS_SUBTYPE)) {
- put_filesystem(fs);
- fs = NULL;
- }
- return fs;
-}
-
-EXPORT_SYMBOL(get_fs_type);