mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 16:47:05 +07:00
5d097056c9
Mark those kmem allocations that are known to be easily triggered from userspace as __GFP_ACCOUNT/SLAB_ACCOUNT, which makes them accounted to memcg. For the list, see below: - threadinfo - task_struct - task_delay_info - pid - cred - mm_struct - vm_area_struct and vm_region (nommu) - anon_vma and anon_vma_chain - signal_struct - sighand_struct - fs_struct - files_struct - fdtable and fdtable->full_fds_bits - dentry and external_name - inode for all filesystems. This is the most tedious part, because most filesystems overwrite the alloc_inode method. The list is far from complete, so feel free to add more objects. Nevertheless, it should be close to "account everything" approach and keep most workloads within bounds. Malevolent users will be able to breach the limit, but this was possible even with the former "account everything" approach (simply because it did not account everything in fact). [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Tejun Heo <tj@kernel.org> Cc: Greg Thelen <gthelen@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
967 lines
24 KiB
C
967 lines
24 KiB
C
/*
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* linux/fs/befs/linuxvfs.c
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*
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* Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/errno.h>
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#include <linux/stat.h>
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#include <linux/nls.h>
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#include <linux/buffer_head.h>
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#include <linux/vfs.h>
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#include <linux/parser.h>
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#include <linux/namei.h>
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#include <linux/sched.h>
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#include "befs.h"
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#include "btree.h"
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#include "inode.h"
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#include "datastream.h"
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#include "super.h"
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#include "io.h"
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MODULE_DESCRIPTION("BeOS File System (BeFS) driver");
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MODULE_AUTHOR("Will Dyson");
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MODULE_LICENSE("GPL");
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/* The units the vfs expects inode->i_blocks to be in */
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#define VFS_BLOCK_SIZE 512
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static int befs_readdir(struct file *, struct dir_context *);
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static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int);
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static int befs_readpage(struct file *file, struct page *page);
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static sector_t befs_bmap(struct address_space *mapping, sector_t block);
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static struct dentry *befs_lookup(struct inode *, struct dentry *, unsigned int);
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static struct inode *befs_iget(struct super_block *, unsigned long);
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static struct inode *befs_alloc_inode(struct super_block *sb);
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static void befs_destroy_inode(struct inode *inode);
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static void befs_destroy_inodecache(void);
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static int befs_symlink_readpage(struct file *, struct page *);
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static int befs_utf2nls(struct super_block *sb, const char *in, int in_len,
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char **out, int *out_len);
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static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
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char **out, int *out_len);
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static void befs_put_super(struct super_block *);
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static int befs_remount(struct super_block *, int *, char *);
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static int befs_statfs(struct dentry *, struct kstatfs *);
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static int parse_options(char *, struct befs_mount_options *);
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static const struct super_operations befs_sops = {
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.alloc_inode = befs_alloc_inode, /* allocate a new inode */
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.destroy_inode = befs_destroy_inode, /* deallocate an inode */
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.put_super = befs_put_super, /* uninit super */
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.statfs = befs_statfs, /* statfs */
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.remount_fs = befs_remount,
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.show_options = generic_show_options,
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};
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/* slab cache for befs_inode_info objects */
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static struct kmem_cache *befs_inode_cachep;
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static const struct file_operations befs_dir_operations = {
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.read = generic_read_dir,
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.iterate = befs_readdir,
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.llseek = generic_file_llseek,
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};
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static const struct inode_operations befs_dir_inode_operations = {
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.lookup = befs_lookup,
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};
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static const struct address_space_operations befs_aops = {
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.readpage = befs_readpage,
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.bmap = befs_bmap,
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};
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static const struct address_space_operations befs_symlink_aops = {
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.readpage = befs_symlink_readpage,
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};
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/*
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* Called by generic_file_read() to read a page of data
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*
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* In turn, simply calls a generic block read function and
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* passes it the address of befs_get_block, for mapping file
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* positions to disk blocks.
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*/
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static int
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befs_readpage(struct file *file, struct page *page)
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{
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return block_read_full_page(page, befs_get_block);
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}
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static sector_t
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befs_bmap(struct address_space *mapping, sector_t block)
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{
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return generic_block_bmap(mapping, block, befs_get_block);
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}
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/*
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* Generic function to map a file position (block) to a
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* disk offset (passed back in bh_result).
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*
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* Used by many higher level functions.
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*
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* Calls befs_fblock2brun() in datastream.c to do the real work.
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*
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* -WD 10-26-01
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*/
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static int
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befs_get_block(struct inode *inode, sector_t block,
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struct buffer_head *bh_result, int create)
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{
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struct super_block *sb = inode->i_sb;
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befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
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befs_block_run run = BAD_IADDR;
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int res = 0;
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ulong disk_off;
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befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld",
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(unsigned long)inode->i_ino, (long)block);
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if (create) {
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befs_error(sb, "befs_get_block() was asked to write to "
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"block %ld in inode %lu", (long)block,
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(unsigned long)inode->i_ino);
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return -EPERM;
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}
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res = befs_fblock2brun(sb, ds, block, &run);
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if (res != BEFS_OK) {
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befs_error(sb,
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"<--- %s for inode %lu, block %ld ERROR",
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__func__, (unsigned long)inode->i_ino,
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(long)block);
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return -EFBIG;
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}
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disk_off = (ulong) iaddr2blockno(sb, &run);
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map_bh(bh_result, inode->i_sb, disk_off);
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befs_debug(sb, "<--- %s for inode %lu, block %ld, disk address %lu",
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__func__, (unsigned long)inode->i_ino, (long)block,
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(unsigned long)disk_off);
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return 0;
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}
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static struct dentry *
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befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
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{
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struct inode *inode = NULL;
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struct super_block *sb = dir->i_sb;
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befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
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befs_off_t offset;
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int ret;
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int utfnamelen;
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char *utfname;
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const char *name = dentry->d_name.name;
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befs_debug(sb, "---> %s name %pd inode %ld", __func__,
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dentry, dir->i_ino);
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/* Convert to UTF-8 */
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if (BEFS_SB(sb)->nls) {
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ret =
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befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen);
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if (ret < 0) {
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befs_debug(sb, "<--- %s ERROR", __func__);
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return ERR_PTR(ret);
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}
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ret = befs_btree_find(sb, ds, utfname, &offset);
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kfree(utfname);
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} else {
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ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset);
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}
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if (ret == BEFS_BT_NOT_FOUND) {
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befs_debug(sb, "<--- %s %pd not found", __func__, dentry);
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return ERR_PTR(-ENOENT);
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} else if (ret != BEFS_OK || offset == 0) {
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befs_warning(sb, "<--- %s Error", __func__);
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return ERR_PTR(-ENODATA);
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}
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inode = befs_iget(dir->i_sb, (ino_t) offset);
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if (IS_ERR(inode))
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return ERR_CAST(inode);
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d_add(dentry, inode);
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befs_debug(sb, "<--- %s", __func__);
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return NULL;
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}
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static int
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befs_readdir(struct file *file, struct dir_context *ctx)
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{
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struct inode *inode = file_inode(file);
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struct super_block *sb = inode->i_sb;
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befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
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befs_off_t value;
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int result;
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size_t keysize;
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unsigned char d_type;
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char keybuf[BEFS_NAME_LEN + 1];
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befs_debug(sb, "---> %s name %pD, inode %ld, ctx->pos %lld",
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__func__, file, inode->i_ino, ctx->pos);
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more:
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result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1,
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keybuf, &keysize, &value);
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if (result == BEFS_ERR) {
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befs_debug(sb, "<--- %s ERROR", __func__);
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befs_error(sb, "IO error reading %pD (inode %lu)",
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file, inode->i_ino);
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return -EIO;
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} else if (result == BEFS_BT_END) {
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befs_debug(sb, "<--- %s END", __func__);
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return 0;
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} else if (result == BEFS_BT_EMPTY) {
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befs_debug(sb, "<--- %s Empty directory", __func__);
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return 0;
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}
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d_type = DT_UNKNOWN;
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/* Convert to NLS */
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if (BEFS_SB(sb)->nls) {
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char *nlsname;
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int nlsnamelen;
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result =
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befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen);
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if (result < 0) {
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befs_debug(sb, "<--- %s ERROR", __func__);
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return result;
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}
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if (!dir_emit(ctx, nlsname, nlsnamelen,
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(ino_t) value, d_type)) {
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kfree(nlsname);
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return 0;
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}
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kfree(nlsname);
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} else {
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if (!dir_emit(ctx, keybuf, keysize,
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(ino_t) value, d_type))
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return 0;
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}
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ctx->pos++;
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goto more;
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}
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static struct inode *
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befs_alloc_inode(struct super_block *sb)
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{
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struct befs_inode_info *bi;
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bi = kmem_cache_alloc(befs_inode_cachep, GFP_KERNEL);
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if (!bi)
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return NULL;
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return &bi->vfs_inode;
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}
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static void befs_i_callback(struct rcu_head *head)
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{
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struct inode *inode = container_of(head, struct inode, i_rcu);
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kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
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}
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static void befs_destroy_inode(struct inode *inode)
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{
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call_rcu(&inode->i_rcu, befs_i_callback);
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}
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static void init_once(void *foo)
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{
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struct befs_inode_info *bi = (struct befs_inode_info *) foo;
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inode_init_once(&bi->vfs_inode);
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}
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static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
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{
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struct buffer_head *bh = NULL;
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befs_inode *raw_inode = NULL;
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struct befs_sb_info *befs_sb = BEFS_SB(sb);
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struct befs_inode_info *befs_ino = NULL;
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struct inode *inode;
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long ret = -EIO;
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befs_debug(sb, "---> %s inode = %lu", __func__, ino);
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inode = iget_locked(sb, ino);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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if (!(inode->i_state & I_NEW))
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return inode;
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befs_ino = BEFS_I(inode);
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/* convert from vfs's inode number to befs's inode number */
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befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
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befs_debug(sb, " real inode number [%u, %hu, %hu]",
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befs_ino->i_inode_num.allocation_group,
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befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
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bh = befs_bread(sb, inode->i_ino);
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if (!bh) {
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befs_error(sb, "unable to read inode block - "
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"inode = %lu", inode->i_ino);
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goto unacquire_none;
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}
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raw_inode = (befs_inode *) bh->b_data;
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befs_dump_inode(sb, raw_inode);
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if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
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befs_error(sb, "Bad inode: %lu", inode->i_ino);
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goto unacquire_bh;
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}
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inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
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/*
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* set uid and gid. But since current BeOS is single user OS, so
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* you can change by "uid" or "gid" options.
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*/
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inode->i_uid = befs_sb->mount_opts.use_uid ?
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befs_sb->mount_opts.uid :
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make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid));
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inode->i_gid = befs_sb->mount_opts.use_gid ?
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befs_sb->mount_opts.gid :
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make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid));
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set_nlink(inode, 1);
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/*
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* BEFS's time is 64 bits, but current VFS is 32 bits...
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* BEFS don't have access time. Nor inode change time. VFS
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* doesn't have creation time.
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* Also, the lower 16 bits of the last_modified_time and
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* create_time are just a counter to help ensure uniqueness
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* for indexing purposes. (PFD, page 54)
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*/
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inode->i_mtime.tv_sec =
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fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
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inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */
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inode->i_ctime = inode->i_mtime;
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inode->i_atime = inode->i_mtime;
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befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
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befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
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befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
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befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
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if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
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inode->i_size = 0;
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inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
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strlcpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
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BEFS_SYMLINK_LEN);
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} else {
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int num_blks;
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befs_ino->i_data.ds =
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fsds_to_cpu(sb, &raw_inode->data.datastream);
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num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
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inode->i_blocks =
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num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
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inode->i_size = befs_ino->i_data.ds.size;
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}
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inode->i_mapping->a_ops = &befs_aops;
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if (S_ISREG(inode->i_mode)) {
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inode->i_fop = &generic_ro_fops;
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} else if (S_ISDIR(inode->i_mode)) {
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inode->i_op = &befs_dir_inode_operations;
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inode->i_fop = &befs_dir_operations;
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} else if (S_ISLNK(inode->i_mode)) {
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if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
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inode->i_op = &page_symlink_inode_operations;
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inode_nohighmem(inode);
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inode->i_mapping->a_ops = &befs_symlink_aops;
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} else {
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inode->i_link = befs_ino->i_data.symlink;
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inode->i_op = &simple_symlink_inode_operations;
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}
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} else {
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befs_error(sb, "Inode %lu is not a regular file, "
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"directory or symlink. THAT IS WRONG! BeFS has no "
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"on disk special files", inode->i_ino);
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goto unacquire_bh;
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}
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brelse(bh);
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befs_debug(sb, "<--- %s", __func__);
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unlock_new_inode(inode);
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return inode;
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unacquire_bh:
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brelse(bh);
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unacquire_none:
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iget_failed(inode);
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befs_debug(sb, "<--- %s - Bad inode", __func__);
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return ERR_PTR(ret);
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}
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/* Initialize the inode cache. Called at fs setup.
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*
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* Taken from NFS implementation by Al Viro.
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*/
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static int __init
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befs_init_inodecache(void)
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{
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befs_inode_cachep = kmem_cache_create("befs_inode_cache",
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sizeof (struct befs_inode_info),
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0, (SLAB_RECLAIM_ACCOUNT|
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SLAB_MEM_SPREAD|SLAB_ACCOUNT),
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init_once);
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if (befs_inode_cachep == NULL) {
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pr_err("%s: Couldn't initialize inode slabcache\n", __func__);
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return -ENOMEM;
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}
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return 0;
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}
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/* Called at fs teardown.
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*
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* Taken from NFS implementation by Al Viro.
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*/
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static void
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befs_destroy_inodecache(void)
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{
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/*
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* Make sure all delayed rcu free inodes are flushed before we
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* destroy cache.
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|
*/
|
|
rcu_barrier();
|
|
kmem_cache_destroy(befs_inode_cachep);
|
|
}
|
|
|
|
/*
|
|
* The inode of symbolic link is different to data stream.
|
|
* The data stream become link name. Unless the LONG_SYMLINK
|
|
* flag is set.
|
|
*/
|
|
static int befs_symlink_readpage(struct file *unused, struct page *page)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct super_block *sb = inode->i_sb;
|
|
struct befs_inode_info *befs_ino = BEFS_I(inode);
|
|
befs_data_stream *data = &befs_ino->i_data.ds;
|
|
befs_off_t len = data->size;
|
|
char *link = page_address(page);
|
|
|
|
if (len == 0 || len > PAGE_SIZE) {
|
|
befs_error(sb, "Long symlink with illegal length");
|
|
goto fail;
|
|
}
|
|
befs_debug(sb, "Follow long symlink");
|
|
|
|
if (befs_read_lsymlink(sb, data, link, len) != len) {
|
|
befs_error(sb, "Failed to read entire long symlink");
|
|
goto fail;
|
|
}
|
|
link[len - 1] = '\0';
|
|
SetPageUptodate(page);
|
|
unlock_page(page);
|
|
return 0;
|
|
fail:
|
|
SetPageError(page);
|
|
unlock_page(page);
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* UTF-8 to NLS charset convert routine
|
|
*
|
|
*
|
|
* Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than
|
|
* the nls tables directly
|
|
*/
|
|
|
|
static int
|
|
befs_utf2nls(struct super_block *sb, const char *in,
|
|
int in_len, char **out, int *out_len)
|
|
{
|
|
struct nls_table *nls = BEFS_SB(sb)->nls;
|
|
int i, o;
|
|
unicode_t uni;
|
|
int unilen, utflen;
|
|
char *result;
|
|
/* The utf8->nls conversion won't make the final nls string bigger
|
|
* than the utf one, but if the string is pure ascii they'll have the
|
|
* same width and an extra char is needed to save the additional \0
|
|
*/
|
|
int maxlen = in_len + 1;
|
|
|
|
befs_debug(sb, "---> %s", __func__);
|
|
|
|
if (!nls) {
|
|
befs_error(sb, "%s called with no NLS table loaded", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
*out = result = kmalloc(maxlen, GFP_NOFS);
|
|
if (!*out) {
|
|
befs_error(sb, "%s cannot allocate memory", __func__);
|
|
*out_len = 0;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = o = 0; i < in_len; i += utflen, o += unilen) {
|
|
|
|
/* convert from UTF-8 to Unicode */
|
|
utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
|
|
if (utflen < 0)
|
|
goto conv_err;
|
|
|
|
/* convert from Unicode to nls */
|
|
if (uni > MAX_WCHAR_T)
|
|
goto conv_err;
|
|
unilen = nls->uni2char(uni, &result[o], in_len - o);
|
|
if (unilen < 0)
|
|
goto conv_err;
|
|
}
|
|
result[o] = '\0';
|
|
*out_len = o;
|
|
|
|
befs_debug(sb, "<--- %s", __func__);
|
|
|
|
return o;
|
|
|
|
conv_err:
|
|
befs_error(sb, "Name using character set %s contains a character that "
|
|
"cannot be converted to unicode.", nls->charset);
|
|
befs_debug(sb, "<--- %s", __func__);
|
|
kfree(result);
|
|
return -EILSEQ;
|
|
}
|
|
|
|
/**
|
|
* befs_nls2utf - Convert NLS string to utf8 encodeing
|
|
* @sb: Superblock
|
|
* @in: Input string buffer in NLS format
|
|
* @in_len: Length of input string in bytes
|
|
* @out: The output string in UTF-8 format
|
|
* @out_len: Length of the output buffer
|
|
*
|
|
* Converts input string @in, which is in the format of the loaded NLS map,
|
|
* into a utf8 string.
|
|
*
|
|
* The destination string @out is allocated by this function and the caller is
|
|
* responsible for freeing it with kfree()
|
|
*
|
|
* On return, *@out_len is the length of @out in bytes.
|
|
*
|
|
* On success, the return value is the number of utf8 characters written to
|
|
* the output buffer @out.
|
|
*
|
|
* On Failure, a negative number coresponding to the error code is returned.
|
|
*/
|
|
|
|
static int
|
|
befs_nls2utf(struct super_block *sb, const char *in,
|
|
int in_len, char **out, int *out_len)
|
|
{
|
|
struct nls_table *nls = BEFS_SB(sb)->nls;
|
|
int i, o;
|
|
wchar_t uni;
|
|
int unilen, utflen;
|
|
char *result;
|
|
/* There're nls characters that will translate to 3-chars-wide UTF-8
|
|
* characters, a additional byte is needed to save the final \0
|
|
* in special cases */
|
|
int maxlen = (3 * in_len) + 1;
|
|
|
|
befs_debug(sb, "---> %s\n", __func__);
|
|
|
|
if (!nls) {
|
|
befs_error(sb, "%s called with no NLS table loaded.",
|
|
__func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
*out = result = kmalloc(maxlen, GFP_NOFS);
|
|
if (!*out) {
|
|
befs_error(sb, "%s cannot allocate memory", __func__);
|
|
*out_len = 0;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = o = 0; i < in_len; i += unilen, o += utflen) {
|
|
|
|
/* convert from nls to unicode */
|
|
unilen = nls->char2uni(&in[i], in_len - i, &uni);
|
|
if (unilen < 0)
|
|
goto conv_err;
|
|
|
|
/* convert from unicode to UTF-8 */
|
|
utflen = utf32_to_utf8(uni, &result[o], 3);
|
|
if (utflen <= 0)
|
|
goto conv_err;
|
|
}
|
|
|
|
result[o] = '\0';
|
|
*out_len = o;
|
|
|
|
befs_debug(sb, "<--- %s", __func__);
|
|
|
|
return i;
|
|
|
|
conv_err:
|
|
befs_error(sb, "Name using charecter set %s contains a charecter that "
|
|
"cannot be converted to unicode.", nls->charset);
|
|
befs_debug(sb, "<--- %s", __func__);
|
|
kfree(result);
|
|
return -EILSEQ;
|
|
}
|
|
|
|
/**
|
|
* Use the
|
|
*
|
|
*/
|
|
enum {
|
|
Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
|
|
};
|
|
|
|
static const match_table_t befs_tokens = {
|
|
{Opt_uid, "uid=%d"},
|
|
{Opt_gid, "gid=%d"},
|
|
{Opt_charset, "iocharset=%s"},
|
|
{Opt_debug, "debug"},
|
|
{Opt_err, NULL}
|
|
};
|
|
|
|
static int
|
|
parse_options(char *options, struct befs_mount_options *opts)
|
|
{
|
|
char *p;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int option;
|
|
kuid_t uid;
|
|
kgid_t gid;
|
|
|
|
/* Initialize options */
|
|
opts->uid = GLOBAL_ROOT_UID;
|
|
opts->gid = GLOBAL_ROOT_GID;
|
|
opts->use_uid = 0;
|
|
opts->use_gid = 0;
|
|
opts->iocharset = NULL;
|
|
opts->debug = 0;
|
|
|
|
if (!options)
|
|
return 1;
|
|
|
|
while ((p = strsep(&options, ",")) != NULL) {
|
|
int token;
|
|
if (!*p)
|
|
continue;
|
|
|
|
token = match_token(p, befs_tokens, args);
|
|
switch (token) {
|
|
case Opt_uid:
|
|
if (match_int(&args[0], &option))
|
|
return 0;
|
|
uid = INVALID_UID;
|
|
if (option >= 0)
|
|
uid = make_kuid(current_user_ns(), option);
|
|
if (!uid_valid(uid)) {
|
|
pr_err("Invalid uid %d, "
|
|
"using default\n", option);
|
|
break;
|
|
}
|
|
opts->uid = uid;
|
|
opts->use_uid = 1;
|
|
break;
|
|
case Opt_gid:
|
|
if (match_int(&args[0], &option))
|
|
return 0;
|
|
gid = INVALID_GID;
|
|
if (option >= 0)
|
|
gid = make_kgid(current_user_ns(), option);
|
|
if (!gid_valid(gid)) {
|
|
pr_err("Invalid gid %d, "
|
|
"using default\n", option);
|
|
break;
|
|
}
|
|
opts->gid = gid;
|
|
opts->use_gid = 1;
|
|
break;
|
|
case Opt_charset:
|
|
kfree(opts->iocharset);
|
|
opts->iocharset = match_strdup(&args[0]);
|
|
if (!opts->iocharset) {
|
|
pr_err("allocation failure for "
|
|
"iocharset string\n");
|
|
return 0;
|
|
}
|
|
break;
|
|
case Opt_debug:
|
|
opts->debug = 1;
|
|
break;
|
|
default:
|
|
pr_err("Unrecognized mount option \"%s\" "
|
|
"or missing value\n", p);
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/* This function has the responsibiltiy of getting the
|
|
* filesystem ready for unmounting.
|
|
* Basically, we free everything that we allocated in
|
|
* befs_read_inode
|
|
*/
|
|
static void
|
|
befs_put_super(struct super_block *sb)
|
|
{
|
|
kfree(BEFS_SB(sb)->mount_opts.iocharset);
|
|
BEFS_SB(sb)->mount_opts.iocharset = NULL;
|
|
unload_nls(BEFS_SB(sb)->nls);
|
|
kfree(sb->s_fs_info);
|
|
sb->s_fs_info = NULL;
|
|
}
|
|
|
|
/* Allocate private field of the superblock, fill it.
|
|
*
|
|
* Finish filling the public superblock fields
|
|
* Make the root directory
|
|
* Load a set of NLS translations if needed.
|
|
*/
|
|
static int
|
|
befs_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct befs_sb_info *befs_sb;
|
|
befs_super_block *disk_sb;
|
|
struct inode *root;
|
|
long ret = -EINVAL;
|
|
const unsigned long sb_block = 0;
|
|
const off_t x86_sb_off = 512;
|
|
|
|
save_mount_options(sb, data);
|
|
|
|
sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL);
|
|
if (sb->s_fs_info == NULL) {
|
|
pr_err("(%s): Unable to allocate memory for private "
|
|
"portion of superblock. Bailing.\n", sb->s_id);
|
|
goto unacquire_none;
|
|
}
|
|
befs_sb = BEFS_SB(sb);
|
|
|
|
if (!parse_options((char *) data, &befs_sb->mount_opts)) {
|
|
befs_error(sb, "cannot parse mount options");
|
|
goto unacquire_priv_sbp;
|
|
}
|
|
|
|
befs_debug(sb, "---> %s", __func__);
|
|
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
|
befs_warning(sb,
|
|
"No write support. Marking filesystem read-only");
|
|
sb->s_flags |= MS_RDONLY;
|
|
}
|
|
|
|
/*
|
|
* Set dummy blocksize to read super block.
|
|
* Will be set to real fs blocksize later.
|
|
*
|
|
* Linux 2.4.10 and later refuse to read blocks smaller than
|
|
* the hardsect size for the device. But we also need to read at
|
|
* least 1k to get the second 512 bytes of the volume.
|
|
* -WD 10-26-01
|
|
*/
|
|
sb_min_blocksize(sb, 1024);
|
|
|
|
if (!(bh = sb_bread(sb, sb_block))) {
|
|
befs_error(sb, "unable to read superblock");
|
|
goto unacquire_priv_sbp;
|
|
}
|
|
|
|
/* account for offset of super block on x86 */
|
|
disk_sb = (befs_super_block *) bh->b_data;
|
|
if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
|
|
(disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
|
|
befs_debug(sb, "Using PPC superblock location");
|
|
} else {
|
|
befs_debug(sb, "Using x86 superblock location");
|
|
disk_sb =
|
|
(befs_super_block *) ((void *) bh->b_data + x86_sb_off);
|
|
}
|
|
|
|
if ((befs_load_sb(sb, disk_sb) != BEFS_OK) ||
|
|
(befs_check_sb(sb) != BEFS_OK))
|
|
goto unacquire_bh;
|
|
|
|
befs_dump_super_block(sb, disk_sb);
|
|
|
|
brelse(bh);
|
|
|
|
if( befs_sb->num_blocks > ~((sector_t)0) ) {
|
|
befs_error(sb, "blocks count: %llu "
|
|
"is larger than the host can use",
|
|
befs_sb->num_blocks);
|
|
goto unacquire_priv_sbp;
|
|
}
|
|
|
|
/*
|
|
* set up enough so that it can read an inode
|
|
* Fill in kernel superblock fields from private sb
|
|
*/
|
|
sb->s_magic = BEFS_SUPER_MAGIC;
|
|
/* Set real blocksize of fs */
|
|
sb_set_blocksize(sb, (ulong) befs_sb->block_size);
|
|
sb->s_op = &befs_sops;
|
|
root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
|
|
if (IS_ERR(root)) {
|
|
ret = PTR_ERR(root);
|
|
goto unacquire_priv_sbp;
|
|
}
|
|
sb->s_root = d_make_root(root);
|
|
if (!sb->s_root) {
|
|
befs_error(sb, "get root inode failed");
|
|
goto unacquire_priv_sbp;
|
|
}
|
|
|
|
/* load nls library */
|
|
if (befs_sb->mount_opts.iocharset) {
|
|
befs_debug(sb, "Loading nls: %s",
|
|
befs_sb->mount_opts.iocharset);
|
|
befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
|
|
if (!befs_sb->nls) {
|
|
befs_warning(sb, "Cannot load nls %s"
|
|
" loading default nls",
|
|
befs_sb->mount_opts.iocharset);
|
|
befs_sb->nls = load_nls_default();
|
|
}
|
|
/* load default nls if none is specified in mount options */
|
|
} else {
|
|
befs_debug(sb, "Loading default nls");
|
|
befs_sb->nls = load_nls_default();
|
|
}
|
|
|
|
return 0;
|
|
/*****************/
|
|
unacquire_bh:
|
|
brelse(bh);
|
|
|
|
unacquire_priv_sbp:
|
|
kfree(befs_sb->mount_opts.iocharset);
|
|
kfree(sb->s_fs_info);
|
|
|
|
unacquire_none:
|
|
sb->s_fs_info = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
befs_remount(struct super_block *sb, int *flags, char *data)
|
|
{
|
|
sync_filesystem(sb);
|
|
if (!(*flags & MS_RDONLY))
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
befs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
|
|
|
|
befs_debug(sb, "---> %s", __func__);
|
|
|
|
buf->f_type = BEFS_SUPER_MAGIC;
|
|
buf->f_bsize = sb->s_blocksize;
|
|
buf->f_blocks = BEFS_SB(sb)->num_blocks;
|
|
buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
|
|
buf->f_bavail = buf->f_bfree;
|
|
buf->f_files = 0; /* UNKNOWN */
|
|
buf->f_ffree = 0; /* UNKNOWN */
|
|
buf->f_fsid.val[0] = (u32)id;
|
|
buf->f_fsid.val[1] = (u32)(id >> 32);
|
|
buf->f_namelen = BEFS_NAME_LEN;
|
|
|
|
befs_debug(sb, "<--- %s", __func__);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct dentry *
|
|
befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name,
|
|
void *data)
|
|
{
|
|
return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super);
|
|
}
|
|
|
|
static struct file_system_type befs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "befs",
|
|
.mount = befs_mount,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
MODULE_ALIAS_FS("befs");
|
|
|
|
static int __init
|
|
init_befs_fs(void)
|
|
{
|
|
int err;
|
|
|
|
pr_info("version: %s\n", BEFS_VERSION);
|
|
|
|
err = befs_init_inodecache();
|
|
if (err)
|
|
goto unacquire_none;
|
|
|
|
err = register_filesystem(&befs_fs_type);
|
|
if (err)
|
|
goto unacquire_inodecache;
|
|
|
|
return 0;
|
|
|
|
unacquire_inodecache:
|
|
befs_destroy_inodecache();
|
|
|
|
unacquire_none:
|
|
return err;
|
|
}
|
|
|
|
static void __exit
|
|
exit_befs_fs(void)
|
|
{
|
|
befs_destroy_inodecache();
|
|
|
|
unregister_filesystem(&befs_fs_type);
|
|
}
|
|
|
|
/*
|
|
Macros that typecheck the init and exit functions,
|
|
ensures that they are called at init and cleanup,
|
|
and eliminates warnings about unused functions.
|
|
*/
|
|
module_init(init_befs_fs)
|
|
module_exit(exit_befs_fs)
|