forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
626 lines
14 KiB
626 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* Optimized MPEG FS - inode and super operations. |
|
* Copyright (C) 2006 Bob Copeland <[email protected]> |
|
*/ |
|
#include <linux/module.h> |
|
#include <linux/sched.h> |
|
#include <linux/slab.h> |
|
#include <linux/fs.h> |
|
#include <linux/vfs.h> |
|
#include <linux/cred.h> |
|
#include <linux/parser.h> |
|
#include <linux/buffer_head.h> |
|
#include <linux/vmalloc.h> |
|
#include <linux/writeback.h> |
|
#include <linux/seq_file.h> |
|
#include <linux/crc-itu-t.h> |
|
#include "omfs.h" |
|
|
|
MODULE_AUTHOR("Bob Copeland <[email protected]>"); |
|
MODULE_DESCRIPTION("OMFS (ReplayTV/Karma) Filesystem for Linux"); |
|
MODULE_LICENSE("GPL"); |
|
|
|
struct buffer_head *omfs_bread(struct super_block *sb, sector_t block) |
|
{ |
|
struct omfs_sb_info *sbi = OMFS_SB(sb); |
|
if (block >= sbi->s_num_blocks) |
|
return NULL; |
|
|
|
return sb_bread(sb, clus_to_blk(sbi, block)); |
|
} |
|
|
|
struct inode *omfs_new_inode(struct inode *dir, umode_t mode) |
|
{ |
|
struct inode *inode; |
|
u64 new_block; |
|
int err; |
|
int len; |
|
struct omfs_sb_info *sbi = OMFS_SB(dir->i_sb); |
|
|
|
inode = new_inode(dir->i_sb); |
|
if (!inode) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
err = omfs_allocate_range(dir->i_sb, sbi->s_mirrors, sbi->s_mirrors, |
|
&new_block, &len); |
|
if (err) |
|
goto fail; |
|
|
|
inode->i_ino = new_block; |
|
inode_init_owner(&init_user_ns, inode, NULL, mode); |
|
inode->i_mapping->a_ops = &omfs_aops; |
|
|
|
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
|
switch (mode & S_IFMT) { |
|
case S_IFDIR: |
|
inode->i_op = &omfs_dir_inops; |
|
inode->i_fop = &omfs_dir_operations; |
|
inode->i_size = sbi->s_sys_blocksize; |
|
inc_nlink(inode); |
|
break; |
|
case S_IFREG: |
|
inode->i_op = &omfs_file_inops; |
|
inode->i_fop = &omfs_file_operations; |
|
inode->i_size = 0; |
|
break; |
|
} |
|
|
|
insert_inode_hash(inode); |
|
mark_inode_dirty(inode); |
|
return inode; |
|
fail: |
|
make_bad_inode(inode); |
|
iput(inode); |
|
return ERR_PTR(err); |
|
} |
|
|
|
/* |
|
* Update the header checksums for a dirty inode based on its contents. |
|
* Caller is expected to hold the buffer head underlying oi and mark it |
|
* dirty. |
|
*/ |
|
static void omfs_update_checksums(struct omfs_inode *oi) |
|
{ |
|
int xor, i, ofs = 0, count; |
|
u16 crc = 0; |
|
unsigned char *ptr = (unsigned char *) oi; |
|
|
|
count = be32_to_cpu(oi->i_head.h_body_size); |
|
ofs = sizeof(struct omfs_header); |
|
|
|
crc = crc_itu_t(crc, ptr + ofs, count); |
|
oi->i_head.h_crc = cpu_to_be16(crc); |
|
|
|
xor = ptr[0]; |
|
for (i = 1; i < OMFS_XOR_COUNT; i++) |
|
xor ^= ptr[i]; |
|
|
|
oi->i_head.h_check_xor = xor; |
|
} |
|
|
|
static int __omfs_write_inode(struct inode *inode, int wait) |
|
{ |
|
struct omfs_inode *oi; |
|
struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb); |
|
struct buffer_head *bh, *bh2; |
|
u64 ctime; |
|
int i; |
|
int ret = -EIO; |
|
int sync_failed = 0; |
|
|
|
/* get current inode since we may have written sibling ptrs etc. */ |
|
bh = omfs_bread(inode->i_sb, inode->i_ino); |
|
if (!bh) |
|
goto out; |
|
|
|
oi = (struct omfs_inode *) bh->b_data; |
|
|
|
oi->i_head.h_self = cpu_to_be64(inode->i_ino); |
|
if (S_ISDIR(inode->i_mode)) |
|
oi->i_type = OMFS_DIR; |
|
else if (S_ISREG(inode->i_mode)) |
|
oi->i_type = OMFS_FILE; |
|
else { |
|
printk(KERN_WARNING "omfs: unknown file type: %d\n", |
|
inode->i_mode); |
|
goto out_brelse; |
|
} |
|
|
|
oi->i_head.h_body_size = cpu_to_be32(sbi->s_sys_blocksize - |
|
sizeof(struct omfs_header)); |
|
oi->i_head.h_version = 1; |
|
oi->i_head.h_type = OMFS_INODE_NORMAL; |
|
oi->i_head.h_magic = OMFS_IMAGIC; |
|
oi->i_size = cpu_to_be64(inode->i_size); |
|
|
|
ctime = inode->i_ctime.tv_sec * 1000LL + |
|
((inode->i_ctime.tv_nsec + 999)/1000); |
|
oi->i_ctime = cpu_to_be64(ctime); |
|
|
|
omfs_update_checksums(oi); |
|
|
|
mark_buffer_dirty(bh); |
|
if (wait) { |
|
sync_dirty_buffer(bh); |
|
if (buffer_req(bh) && !buffer_uptodate(bh)) |
|
sync_failed = 1; |
|
} |
|
|
|
/* if mirroring writes, copy to next fsblock */ |
|
for (i = 1; i < sbi->s_mirrors; i++) { |
|
bh2 = omfs_bread(inode->i_sb, inode->i_ino + i); |
|
if (!bh2) |
|
goto out_brelse; |
|
|
|
memcpy(bh2->b_data, bh->b_data, bh->b_size); |
|
mark_buffer_dirty(bh2); |
|
if (wait) { |
|
sync_dirty_buffer(bh2); |
|
if (buffer_req(bh2) && !buffer_uptodate(bh2)) |
|
sync_failed = 1; |
|
} |
|
brelse(bh2); |
|
} |
|
ret = (sync_failed) ? -EIO : 0; |
|
out_brelse: |
|
brelse(bh); |
|
out: |
|
return ret; |
|
} |
|
|
|
static int omfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
|
{ |
|
return __omfs_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); |
|
} |
|
|
|
int omfs_sync_inode(struct inode *inode) |
|
{ |
|
return __omfs_write_inode(inode, 1); |
|
} |
|
|
|
/* |
|
* called when an entry is deleted, need to clear the bits in the |
|
* bitmaps. |
|
*/ |
|
static void omfs_evict_inode(struct inode *inode) |
|
{ |
|
truncate_inode_pages_final(&inode->i_data); |
|
clear_inode(inode); |
|
|
|
if (inode->i_nlink) |
|
return; |
|
|
|
if (S_ISREG(inode->i_mode)) { |
|
inode->i_size = 0; |
|
omfs_shrink_inode(inode); |
|
} |
|
|
|
omfs_clear_range(inode->i_sb, inode->i_ino, 2); |
|
} |
|
|
|
struct inode *omfs_iget(struct super_block *sb, ino_t ino) |
|
{ |
|
struct omfs_sb_info *sbi = OMFS_SB(sb); |
|
struct omfs_inode *oi; |
|
struct buffer_head *bh; |
|
u64 ctime; |
|
unsigned long nsecs; |
|
struct inode *inode; |
|
|
|
inode = iget_locked(sb, ino); |
|
if (!inode) |
|
return ERR_PTR(-ENOMEM); |
|
if (!(inode->i_state & I_NEW)) |
|
return inode; |
|
|
|
bh = omfs_bread(inode->i_sb, ino); |
|
if (!bh) |
|
goto iget_failed; |
|
|
|
oi = (struct omfs_inode *)bh->b_data; |
|
|
|
/* check self */ |
|
if (ino != be64_to_cpu(oi->i_head.h_self)) |
|
goto fail_bh; |
|
|
|
inode->i_uid = sbi->s_uid; |
|
inode->i_gid = sbi->s_gid; |
|
|
|
ctime = be64_to_cpu(oi->i_ctime); |
|
nsecs = do_div(ctime, 1000) * 1000L; |
|
|
|
inode->i_atime.tv_sec = ctime; |
|
inode->i_mtime.tv_sec = ctime; |
|
inode->i_ctime.tv_sec = ctime; |
|
inode->i_atime.tv_nsec = nsecs; |
|
inode->i_mtime.tv_nsec = nsecs; |
|
inode->i_ctime.tv_nsec = nsecs; |
|
|
|
inode->i_mapping->a_ops = &omfs_aops; |
|
|
|
switch (oi->i_type) { |
|
case OMFS_DIR: |
|
inode->i_mode = S_IFDIR | (S_IRWXUGO & ~sbi->s_dmask); |
|
inode->i_op = &omfs_dir_inops; |
|
inode->i_fop = &omfs_dir_operations; |
|
inode->i_size = sbi->s_sys_blocksize; |
|
inc_nlink(inode); |
|
break; |
|
case OMFS_FILE: |
|
inode->i_mode = S_IFREG | (S_IRWXUGO & ~sbi->s_fmask); |
|
inode->i_fop = &omfs_file_operations; |
|
inode->i_size = be64_to_cpu(oi->i_size); |
|
break; |
|
} |
|
brelse(bh); |
|
unlock_new_inode(inode); |
|
return inode; |
|
fail_bh: |
|
brelse(bh); |
|
iget_failed: |
|
iget_failed(inode); |
|
return ERR_PTR(-EIO); |
|
} |
|
|
|
static void omfs_put_super(struct super_block *sb) |
|
{ |
|
struct omfs_sb_info *sbi = OMFS_SB(sb); |
|
kfree(sbi->s_imap); |
|
kfree(sbi); |
|
sb->s_fs_info = NULL; |
|
} |
|
|
|
static int omfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
|
{ |
|
struct super_block *s = dentry->d_sb; |
|
struct omfs_sb_info *sbi = OMFS_SB(s); |
|
u64 id = huge_encode_dev(s->s_bdev->bd_dev); |
|
|
|
buf->f_type = OMFS_MAGIC; |
|
buf->f_bsize = sbi->s_blocksize; |
|
buf->f_blocks = sbi->s_num_blocks; |
|
buf->f_files = sbi->s_num_blocks; |
|
buf->f_namelen = OMFS_NAMELEN; |
|
buf->f_fsid = u64_to_fsid(id); |
|
|
|
buf->f_bfree = buf->f_bavail = buf->f_ffree = |
|
omfs_count_free(s); |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* Display the mount options in /proc/mounts. |
|
*/ |
|
static int omfs_show_options(struct seq_file *m, struct dentry *root) |
|
{ |
|
struct omfs_sb_info *sbi = OMFS_SB(root->d_sb); |
|
umode_t cur_umask = current_umask(); |
|
|
|
if (!uid_eq(sbi->s_uid, current_uid())) |
|
seq_printf(m, ",uid=%u", |
|
from_kuid_munged(&init_user_ns, sbi->s_uid)); |
|
if (!gid_eq(sbi->s_gid, current_gid())) |
|
seq_printf(m, ",gid=%u", |
|
from_kgid_munged(&init_user_ns, sbi->s_gid)); |
|
|
|
if (sbi->s_dmask == sbi->s_fmask) { |
|
if (sbi->s_fmask != cur_umask) |
|
seq_printf(m, ",umask=%o", sbi->s_fmask); |
|
} else { |
|
if (sbi->s_dmask != cur_umask) |
|
seq_printf(m, ",dmask=%o", sbi->s_dmask); |
|
if (sbi->s_fmask != cur_umask) |
|
seq_printf(m, ",fmask=%o", sbi->s_fmask); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static const struct super_operations omfs_sops = { |
|
.write_inode = omfs_write_inode, |
|
.evict_inode = omfs_evict_inode, |
|
.put_super = omfs_put_super, |
|
.statfs = omfs_statfs, |
|
.show_options = omfs_show_options, |
|
}; |
|
|
|
/* |
|
* For Rio Karma, there is an on-disk free bitmap whose location is |
|
* stored in the root block. For ReplayTV, there is no such free bitmap |
|
* so we have to walk the tree. Both inodes and file data are allocated |
|
* from the same map. This array can be big (300k) so we allocate |
|
* in units of the blocksize. |
|
*/ |
|
static int omfs_get_imap(struct super_block *sb) |
|
{ |
|
unsigned int bitmap_size, array_size; |
|
int count; |
|
struct omfs_sb_info *sbi = OMFS_SB(sb); |
|
struct buffer_head *bh; |
|
unsigned long **ptr; |
|
sector_t block; |
|
|
|
bitmap_size = DIV_ROUND_UP(sbi->s_num_blocks, 8); |
|
array_size = DIV_ROUND_UP(bitmap_size, sb->s_blocksize); |
|
|
|
if (sbi->s_bitmap_ino == ~0ULL) |
|
goto out; |
|
|
|
sbi->s_imap_size = array_size; |
|
sbi->s_imap = kcalloc(array_size, sizeof(unsigned long *), GFP_KERNEL); |
|
if (!sbi->s_imap) |
|
goto nomem; |
|
|
|
block = clus_to_blk(sbi, sbi->s_bitmap_ino); |
|
if (block >= sbi->s_num_blocks) |
|
goto nomem; |
|
|
|
ptr = sbi->s_imap; |
|
for (count = bitmap_size; count > 0; count -= sb->s_blocksize) { |
|
bh = sb_bread(sb, block++); |
|
if (!bh) |
|
goto nomem_free; |
|
*ptr = kmemdup(bh->b_data, sb->s_blocksize, GFP_KERNEL); |
|
if (!*ptr) { |
|
brelse(bh); |
|
goto nomem_free; |
|
} |
|
if (count < sb->s_blocksize) |
|
memset((void *)*ptr + count, 0xff, |
|
sb->s_blocksize - count); |
|
brelse(bh); |
|
ptr++; |
|
} |
|
out: |
|
return 0; |
|
|
|
nomem_free: |
|
for (count = 0; count < array_size; count++) |
|
kfree(sbi->s_imap[count]); |
|
|
|
kfree(sbi->s_imap); |
|
nomem: |
|
sbi->s_imap = NULL; |
|
sbi->s_imap_size = 0; |
|
return -ENOMEM; |
|
} |
|
|
|
enum { |
|
Opt_uid, Opt_gid, Opt_umask, Opt_dmask, Opt_fmask, Opt_err |
|
}; |
|
|
|
static const match_table_t tokens = { |
|
{Opt_uid, "uid=%u"}, |
|
{Opt_gid, "gid=%u"}, |
|
{Opt_umask, "umask=%o"}, |
|
{Opt_dmask, "dmask=%o"}, |
|
{Opt_fmask, "fmask=%o"}, |
|
{Opt_err, NULL}, |
|
}; |
|
|
|
static int parse_options(char *options, struct omfs_sb_info *sbi) |
|
{ |
|
char *p; |
|
substring_t args[MAX_OPT_ARGS]; |
|
int option; |
|
|
|
if (!options) |
|
return 1; |
|
|
|
while ((p = strsep(&options, ",")) != NULL) { |
|
int token; |
|
if (!*p) |
|
continue; |
|
|
|
token = match_token(p, tokens, args); |
|
switch (token) { |
|
case Opt_uid: |
|
if (match_int(&args[0], &option)) |
|
return 0; |
|
sbi->s_uid = make_kuid(current_user_ns(), option); |
|
if (!uid_valid(sbi->s_uid)) |
|
return 0; |
|
break; |
|
case Opt_gid: |
|
if (match_int(&args[0], &option)) |
|
return 0; |
|
sbi->s_gid = make_kgid(current_user_ns(), option); |
|
if (!gid_valid(sbi->s_gid)) |
|
return 0; |
|
break; |
|
case Opt_umask: |
|
if (match_octal(&args[0], &option)) |
|
return 0; |
|
sbi->s_fmask = sbi->s_dmask = option; |
|
break; |
|
case Opt_dmask: |
|
if (match_octal(&args[0], &option)) |
|
return 0; |
|
sbi->s_dmask = option; |
|
break; |
|
case Opt_fmask: |
|
if (match_octal(&args[0], &option)) |
|
return 0; |
|
sbi->s_fmask = option; |
|
break; |
|
default: |
|
return 0; |
|
} |
|
} |
|
return 1; |
|
} |
|
|
|
static int omfs_fill_super(struct super_block *sb, void *data, int silent) |
|
{ |
|
struct buffer_head *bh, *bh2; |
|
struct omfs_super_block *omfs_sb; |
|
struct omfs_root_block *omfs_rb; |
|
struct omfs_sb_info *sbi; |
|
struct inode *root; |
|
int ret = -EINVAL; |
|
|
|
sbi = kzalloc(sizeof(struct omfs_sb_info), GFP_KERNEL); |
|
if (!sbi) |
|
return -ENOMEM; |
|
|
|
sb->s_fs_info = sbi; |
|
|
|
sbi->s_uid = current_uid(); |
|
sbi->s_gid = current_gid(); |
|
sbi->s_dmask = sbi->s_fmask = current_umask(); |
|
|
|
if (!parse_options((char *) data, sbi)) |
|
goto end; |
|
|
|
sb->s_maxbytes = 0xffffffff; |
|
|
|
sb->s_time_gran = NSEC_PER_MSEC; |
|
sb->s_time_min = 0; |
|
sb->s_time_max = U64_MAX / MSEC_PER_SEC; |
|
|
|
sb_set_blocksize(sb, 0x200); |
|
|
|
bh = sb_bread(sb, 0); |
|
if (!bh) |
|
goto end; |
|
|
|
omfs_sb = (struct omfs_super_block *)bh->b_data; |
|
|
|
if (omfs_sb->s_magic != cpu_to_be32(OMFS_MAGIC)) { |
|
if (!silent) |
|
printk(KERN_ERR "omfs: Invalid superblock (%x)\n", |
|
omfs_sb->s_magic); |
|
goto out_brelse_bh; |
|
} |
|
sb->s_magic = OMFS_MAGIC; |
|
|
|
sbi->s_num_blocks = be64_to_cpu(omfs_sb->s_num_blocks); |
|
sbi->s_blocksize = be32_to_cpu(omfs_sb->s_blocksize); |
|
sbi->s_mirrors = be32_to_cpu(omfs_sb->s_mirrors); |
|
sbi->s_root_ino = be64_to_cpu(omfs_sb->s_root_block); |
|
sbi->s_sys_blocksize = be32_to_cpu(omfs_sb->s_sys_blocksize); |
|
mutex_init(&sbi->s_bitmap_lock); |
|
|
|
if (sbi->s_num_blocks > OMFS_MAX_BLOCKS) { |
|
printk(KERN_ERR "omfs: sysblock number (%llx) is out of range\n", |
|
(unsigned long long)sbi->s_num_blocks); |
|
goto out_brelse_bh; |
|
} |
|
|
|
if (sbi->s_sys_blocksize > PAGE_SIZE) { |
|
printk(KERN_ERR "omfs: sysblock size (%d) is out of range\n", |
|
sbi->s_sys_blocksize); |
|
goto out_brelse_bh; |
|
} |
|
|
|
if (sbi->s_blocksize < sbi->s_sys_blocksize || |
|
sbi->s_blocksize > OMFS_MAX_BLOCK_SIZE) { |
|
printk(KERN_ERR "omfs: block size (%d) is out of range\n", |
|
sbi->s_blocksize); |
|
goto out_brelse_bh; |
|
} |
|
|
|
/* |
|
* Use sys_blocksize as the fs block since it is smaller than a |
|
* page while the fs blocksize can be larger. |
|
*/ |
|
sb_set_blocksize(sb, sbi->s_sys_blocksize); |
|
|
|
/* |
|
* ...and the difference goes into a shift. sys_blocksize is always |
|
* a power of two factor of blocksize. |
|
*/ |
|
sbi->s_block_shift = get_bitmask_order(sbi->s_blocksize) - |
|
get_bitmask_order(sbi->s_sys_blocksize); |
|
|
|
bh2 = omfs_bread(sb, be64_to_cpu(omfs_sb->s_root_block)); |
|
if (!bh2) |
|
goto out_brelse_bh; |
|
|
|
omfs_rb = (struct omfs_root_block *)bh2->b_data; |
|
|
|
sbi->s_bitmap_ino = be64_to_cpu(omfs_rb->r_bitmap); |
|
sbi->s_clustersize = be32_to_cpu(omfs_rb->r_clustersize); |
|
|
|
if (sbi->s_num_blocks != be64_to_cpu(omfs_rb->r_num_blocks)) { |
|
printk(KERN_ERR "omfs: block count discrepancy between " |
|
"super and root blocks (%llx, %llx)\n", |
|
(unsigned long long)sbi->s_num_blocks, |
|
(unsigned long long)be64_to_cpu(omfs_rb->r_num_blocks)); |
|
goto out_brelse_bh2; |
|
} |
|
|
|
if (sbi->s_bitmap_ino != ~0ULL && |
|
sbi->s_bitmap_ino > sbi->s_num_blocks) { |
|
printk(KERN_ERR "omfs: free space bitmap location is corrupt " |
|
"(%llx, total blocks %llx)\n", |
|
(unsigned long long) sbi->s_bitmap_ino, |
|
(unsigned long long) sbi->s_num_blocks); |
|
goto out_brelse_bh2; |
|
} |
|
if (sbi->s_clustersize < 1 || |
|
sbi->s_clustersize > OMFS_MAX_CLUSTER_SIZE) { |
|
printk(KERN_ERR "omfs: cluster size out of range (%d)", |
|
sbi->s_clustersize); |
|
goto out_brelse_bh2; |
|
} |
|
|
|
ret = omfs_get_imap(sb); |
|
if (ret) |
|
goto out_brelse_bh2; |
|
|
|
sb->s_op = &omfs_sops; |
|
|
|
root = omfs_iget(sb, be64_to_cpu(omfs_rb->r_root_dir)); |
|
if (IS_ERR(root)) { |
|
ret = PTR_ERR(root); |
|
goto out_brelse_bh2; |
|
} |
|
|
|
sb->s_root = d_make_root(root); |
|
if (!sb->s_root) { |
|
ret = -ENOMEM; |
|
goto out_brelse_bh2; |
|
} |
|
printk(KERN_DEBUG "omfs: Mounted volume %s\n", omfs_rb->r_name); |
|
|
|
ret = 0; |
|
out_brelse_bh2: |
|
brelse(bh2); |
|
out_brelse_bh: |
|
brelse(bh); |
|
end: |
|
if (ret) |
|
kfree(sbi); |
|
return ret; |
|
} |
|
|
|
static struct dentry *omfs_mount(struct file_system_type *fs_type, |
|
int flags, const char *dev_name, void *data) |
|
{ |
|
return mount_bdev(fs_type, flags, dev_name, data, omfs_fill_super); |
|
} |
|
|
|
static struct file_system_type omfs_fs_type = { |
|
.owner = THIS_MODULE, |
|
.name = "omfs", |
|
.mount = omfs_mount, |
|
.kill_sb = kill_block_super, |
|
.fs_flags = FS_REQUIRES_DEV, |
|
}; |
|
MODULE_ALIAS_FS("omfs"); |
|
|
|
static int __init init_omfs_fs(void) |
|
{ |
|
return register_filesystem(&omfs_fs_type); |
|
} |
|
|
|
static void __exit exit_omfs_fs(void) |
|
{ |
|
unregister_filesystem(&omfs_fs_type); |
|
} |
|
|
|
module_init(init_omfs_fs); |
|
module_exit(exit_omfs_fs);
|
|
|