android_kernel_xiaomi_sm8350/fs/hfs/super.c
Christoph Lameter 50953fe9e0 slab allocators: Remove SLAB_DEBUG_INITIAL flag
I have never seen a use of SLAB_DEBUG_INITIAL.  It is only supported by
SLAB.

I think its purpose was to have a callback after an object has been freed
to verify that the state is the constructor state again?  The callback is
performed before each freeing of an object.

I would think that it is much easier to check the object state manually
before the free.  That also places the check near the code object
manipulation of the object.

Also the SLAB_DEBUG_INITIAL callback is only performed if the kernel was
compiled with SLAB debugging on.  If there would be code in a constructor
handling SLAB_DEBUG_INITIAL then it would have to be conditional on
SLAB_DEBUG otherwise it would just be dead code.  But there is no such code
in the kernel.  I think SLUB_DEBUG_INITIAL is too problematic to make real
use of, difficult to understand and there are easier ways to accomplish the
same effect (i.e.  add debug code before kfree).

There is a related flag SLAB_CTOR_VERIFY that is frequently checked to be
clear in fs inode caches.  Remove the pointless checks (they would even be
pointless without removeal of SLAB_DEBUG_INITIAL) from the fs constructors.

This is the last slab flag that SLUB did not support.  Remove the check for
unimplemented flags from SLUB.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-07 12:12:57 -07:00

464 lines
12 KiB
C

/*
* linux/fs/hfs/super.c
*
* Copyright (C) 1995-1997 Paul H. Hargrove
* (C) 2003 Ardis Technologies <roman@ardistech.com>
* This file may be distributed under the terms of the GNU General Public License.
*
* This file contains hfs_read_super(), some of the super_ops and
* init_module() and cleanup_module(). The remaining super_ops are in
* inode.c since they deal with inodes.
*
* Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
*/
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/mount.h>
#include <linux/init.h>
#include <linux/nls.h>
#include <linux/parser.h>
#include <linux/seq_file.h>
#include <linux/vfs.h>
#include "hfs_fs.h"
#include "btree.h"
static struct kmem_cache *hfs_inode_cachep;
MODULE_LICENSE("GPL");
/*
* hfs_write_super()
*
* Description:
* This function is called by the VFS only. When the filesystem
* is mounted r/w it updates the MDB on disk.
* Input Variable(s):
* struct super_block *sb: Pointer to the hfs superblock
* Output Variable(s):
* NONE
* Returns:
* void
* Preconditions:
* 'sb' points to a "valid" (struct super_block).
* Postconditions:
* The MDB is marked 'unsuccessfully unmounted' by clearing bit 8 of drAtrb
* (hfs_put_super() must set this flag!). Some MDB fields are updated
* and the MDB buffer is written to disk by calling hfs_mdb_commit().
*/
static void hfs_write_super(struct super_block *sb)
{
sb->s_dirt = 0;
if (sb->s_flags & MS_RDONLY)
return;
/* sync everything to the buffers */
hfs_mdb_commit(sb);
}
/*
* hfs_put_super()
*
* This is the put_super() entry in the super_operations structure for
* HFS filesystems. The purpose is to release the resources
* associated with the superblock sb.
*/
static void hfs_put_super(struct super_block *sb)
{
hfs_mdb_close(sb);
/* release the MDB's resources */
hfs_mdb_put(sb);
}
/*
* hfs_statfs()
*
* This is the statfs() entry in the super_operations structure for
* HFS filesystems. The purpose is to return various data about the
* filesystem.
*
* changed f_files/f_ffree to reflect the fs_ablock/free_ablocks.
*/
static int hfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct super_block *sb = dentry->d_sb;
buf->f_type = HFS_SUPER_MAGIC;
buf->f_bsize = sb->s_blocksize;
buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div;
buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div;
buf->f_bavail = buf->f_bfree;
buf->f_files = HFS_SB(sb)->fs_ablocks;
buf->f_ffree = HFS_SB(sb)->free_ablocks;
buf->f_namelen = HFS_NAMELEN;
return 0;
}
static int hfs_remount(struct super_block *sb, int *flags, char *data)
{
*flags |= MS_NODIRATIME;
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
return 0;
if (!(*flags & MS_RDONLY)) {
if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) {
printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
"running fsck.hfs is recommended. leaving read-only.\n");
sb->s_flags |= MS_RDONLY;
*flags |= MS_RDONLY;
} else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) {
printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
sb->s_flags |= MS_RDONLY;
*flags |= MS_RDONLY;
}
}
return 0;
}
static int hfs_show_options(struct seq_file *seq, struct vfsmount *mnt)
{
struct hfs_sb_info *sbi = HFS_SB(mnt->mnt_sb);
if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f))
seq_printf(seq, ",creator=%.4s", (char *)&sbi->s_creator);
if (sbi->s_type != cpu_to_be32(0x3f3f3f3f))
seq_printf(seq, ",type=%.4s", (char *)&sbi->s_type);
seq_printf(seq, ",uid=%u,gid=%u", sbi->s_uid, sbi->s_gid);
if (sbi->s_file_umask != 0133)
seq_printf(seq, ",file_umask=%o", sbi->s_file_umask);
if (sbi->s_dir_umask != 0022)
seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask);
if (sbi->part >= 0)
seq_printf(seq, ",part=%u", sbi->part);
if (sbi->session >= 0)
seq_printf(seq, ",session=%u", sbi->session);
if (sbi->nls_disk)
seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset);
if (sbi->nls_io)
seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset);
if (sbi->s_quiet)
seq_printf(seq, ",quiet");
return 0;
}
static struct inode *hfs_alloc_inode(struct super_block *sb)
{
struct hfs_inode_info *i;
i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL);
return i ? &i->vfs_inode : NULL;
}
static void hfs_destroy_inode(struct inode *inode)
{
kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
}
static const struct super_operations hfs_super_operations = {
.alloc_inode = hfs_alloc_inode,
.destroy_inode = hfs_destroy_inode,
.write_inode = hfs_write_inode,
.clear_inode = hfs_clear_inode,
.put_super = hfs_put_super,
.write_super = hfs_write_super,
.statfs = hfs_statfs,
.remount_fs = hfs_remount,
.show_options = hfs_show_options,
};
enum {
opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask,
opt_part, opt_session, opt_type, opt_creator, opt_quiet,
opt_codepage, opt_iocharset,
opt_err
};
static match_table_t tokens = {
{ opt_uid, "uid=%u" },
{ opt_gid, "gid=%u" },
{ opt_umask, "umask=%o" },
{ opt_file_umask, "file_umask=%o" },
{ opt_dir_umask, "dir_umask=%o" },
{ opt_part, "part=%u" },
{ opt_session, "session=%u" },
{ opt_type, "type=%s" },
{ opt_creator, "creator=%s" },
{ opt_quiet, "quiet" },
{ opt_codepage, "codepage=%s" },
{ opt_iocharset, "iocharset=%s" },
{ opt_err, NULL }
};
static inline int match_fourchar(substring_t *arg, u32 *result)
{
if (arg->to - arg->from != 4)
return -EINVAL;
memcpy(result, arg->from, 4);
return 0;
}
/*
* parse_options()
*
* adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger
* This function is called by hfs_read_super() to parse the mount options.
*/
static int parse_options(char *options, struct hfs_sb_info *hsb)
{
char *p;
substring_t args[MAX_OPT_ARGS];
int tmp, token;
/* initialize the sb with defaults */
hsb->s_uid = current->uid;
hsb->s_gid = current->gid;
hsb->s_file_umask = 0133;
hsb->s_dir_umask = 0022;
hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */
hsb->s_quiet = 0;
hsb->part = -1;
hsb->session = -1;
if (!options)
return 1;
while ((p = strsep(&options, ",")) != NULL) {
if (!*p)
continue;
token = match_token(p, tokens, args);
switch (token) {
case opt_uid:
if (match_int(&args[0], &tmp)) {
printk(KERN_ERR "hfs: uid requires an argument\n");
return 0;
}
hsb->s_uid = (uid_t)tmp;
break;
case opt_gid:
if (match_int(&args[0], &tmp)) {
printk(KERN_ERR "hfs: gid requires an argument\n");
return 0;
}
hsb->s_gid = (gid_t)tmp;
break;
case opt_umask:
if (match_octal(&args[0], &tmp)) {
printk(KERN_ERR "hfs: umask requires a value\n");
return 0;
}
hsb->s_file_umask = (umode_t)tmp;
hsb->s_dir_umask = (umode_t)tmp;
break;
case opt_file_umask:
if (match_octal(&args[0], &tmp)) {
printk(KERN_ERR "hfs: file_umask requires a value\n");
return 0;
}
hsb->s_file_umask = (umode_t)tmp;
break;
case opt_dir_umask:
if (match_octal(&args[0], &tmp)) {
printk(KERN_ERR "hfs: dir_umask requires a value\n");
return 0;
}
hsb->s_dir_umask = (umode_t)tmp;
break;
case opt_part:
if (match_int(&args[0], &hsb->part)) {
printk(KERN_ERR "hfs: part requires an argument\n");
return 0;
}
break;
case opt_session:
if (match_int(&args[0], &hsb->session)) {
printk(KERN_ERR "hfs: session requires an argument\n");
return 0;
}
break;
case opt_type:
if (match_fourchar(&args[0], &hsb->s_type)) {
printk(KERN_ERR "hfs: type requires a 4 character value\n");
return 0;
}
break;
case opt_creator:
if (match_fourchar(&args[0], &hsb->s_creator)) {
printk(KERN_ERR "hfs: creator requires a 4 character value\n");
return 0;
}
break;
case opt_quiet:
hsb->s_quiet = 1;
break;
case opt_codepage:
if (hsb->nls_disk) {
printk(KERN_ERR "hfs: unable to change codepage\n");
return 0;
}
p = match_strdup(&args[0]);
hsb->nls_disk = load_nls(p);
if (!hsb->nls_disk) {
printk(KERN_ERR "hfs: unable to load codepage \"%s\"\n", p);
kfree(p);
return 0;
}
kfree(p);
break;
case opt_iocharset:
if (hsb->nls_io) {
printk(KERN_ERR "hfs: unable to change iocharset\n");
return 0;
}
p = match_strdup(&args[0]);
hsb->nls_io = load_nls(p);
if (!hsb->nls_io) {
printk(KERN_ERR "hfs: unable to load iocharset \"%s\"\n", p);
kfree(p);
return 0;
}
kfree(p);
break;
default:
return 0;
}
}
if (hsb->nls_disk && !hsb->nls_io) {
hsb->nls_io = load_nls_default();
if (!hsb->nls_io) {
printk(KERN_ERR "hfs: unable to load default iocharset\n");
return 0;
}
}
hsb->s_dir_umask &= 0777;
hsb->s_file_umask &= 0577;
return 1;
}
/*
* hfs_read_super()
*
* This is the function that is responsible for mounting an HFS
* filesystem. It performs all the tasks necessary to get enough data
* from the disk to read the root inode. This includes parsing the
* mount options, dealing with Macintosh partitions, reading the
* superblock and the allocation bitmap blocks, calling
* hfs_btree_init() to get the necessary data about the extents and
* catalog B-trees and, finally, reading the root inode into memory.
*/
static int hfs_fill_super(struct super_block *sb, void *data, int silent)
{
struct hfs_sb_info *sbi;
struct hfs_find_data fd;
hfs_cat_rec rec;
struct inode *root_inode;
int res;
sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL);
if (!sbi)
return -ENOMEM;
sb->s_fs_info = sbi;
INIT_HLIST_HEAD(&sbi->rsrc_inodes);
res = -EINVAL;
if (!parse_options((char *)data, sbi)) {
printk(KERN_ERR "hfs: unable to parse mount options.\n");
goto bail;
}
sb->s_op = &hfs_super_operations;
sb->s_flags |= MS_NODIRATIME;
init_MUTEX(&sbi->bitmap_lock);
res = hfs_mdb_get(sb);
if (res) {
if (!silent)
printk(KERN_WARNING "hfs: can't find a HFS filesystem on dev %s.\n",
hfs_mdb_name(sb));
res = -EINVAL;
goto bail;
}
/* try to get the root inode */
hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
if (!res)
hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
if (res) {
hfs_find_exit(&fd);
goto bail_no_root;
}
res = -EINVAL;
root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
hfs_find_exit(&fd);
if (!root_inode)
goto bail_no_root;
res = -ENOMEM;
sb->s_root = d_alloc_root(root_inode);
if (!sb->s_root)
goto bail_iput;
sb->s_root->d_op = &hfs_dentry_operations;
/* everything's okay */
return 0;
bail_iput:
iput(root_inode);
bail_no_root:
printk(KERN_ERR "hfs: get root inode failed.\n");
bail:
hfs_mdb_put(sb);
return res;
}
static int hfs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data,
struct vfsmount *mnt)
{
return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super, mnt);
}
static struct file_system_type hfs_fs_type = {
.owner = THIS_MODULE,
.name = "hfs",
.get_sb = hfs_get_sb,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
};
static void hfs_init_once(void *p, struct kmem_cache *cachep, unsigned long flags)
{
struct hfs_inode_info *i = p;
if (flags & SLAB_CTOR_CONSTRUCTOR)
inode_init_once(&i->vfs_inode);
}
static int __init init_hfs_fs(void)
{
int err;
hfs_inode_cachep = kmem_cache_create("hfs_inode_cache",
sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN,
hfs_init_once, NULL);
if (!hfs_inode_cachep)
return -ENOMEM;
err = register_filesystem(&hfs_fs_type);
if (err)
kmem_cache_destroy(hfs_inode_cachep);
return err;
}
static void __exit exit_hfs_fs(void)
{
unregister_filesystem(&hfs_fs_type);
kmem_cache_destroy(hfs_inode_cachep);
}
module_init(init_hfs_fs)
module_exit(exit_hfs_fs)