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author | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
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committer | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
commit | 871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch) | |
tree | 8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/fs/filesystems.c | |
parent | 9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff) | |
download | FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.tar.gz FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.tar.bz2 FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.zip |
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.c | 286 |
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); |