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freebsd/sys/gnu/fs/reiserfs/reiserfs_vfsops.c
Attilio Rao bc2258da88 Complete MPSAFE VFS interface and remove MNTK_MPSAFE flag. 
Porters should refer to __FreeBSD_version 1000021 for this change as
it may have happened at the same timeframe.
2012-11-09 18:02:25 +00:00

1136 lines
30 KiB
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/*-
* Copyright 2000 Hans Reiser
* See README for licensing and copyright details
*
* Ported to FreeBSD by Jean-Sébastien Pédron <jspedron@club-internet.fr>
*
* $FreeBSD$
*/
#include <gnu/fs/reiserfs/reiserfs_fs.h>
const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
/*
* Default recommended I/O size is 128k. There might be broken
* applications that are confused by this. Use nolargeio mount option to
* get usual i/o size = PAGE_SIZE.
*/
int reiserfs_default_io_size = 128 * 1024;
static vfs_cmount_t reiserfs_cmount;
static vfs_fhtovp_t reiserfs_fhtovp;
static vfs_mount_t reiserfs_mount;
static vfs_root_t reiserfs_root;
static vfs_statfs_t reiserfs_statfs;
static vfs_unmount_t reiserfs_unmount;
static int reiserfs_mountfs(struct vnode *devvp, struct mount *mp,
struct thread *td);
static void load_bitmap_info_data(struct reiserfs_sb_info *sbi,
struct reiserfs_bitmap_info *bi);
static int read_bitmaps(struct reiserfs_mount *rmp);
static int read_old_bitmaps(struct reiserfs_mount *rmp);
static int read_super_block(struct reiserfs_mount *rmp, int offset);
static hashf_t hash_function(struct reiserfs_mount *rmp);
static int get_root_node(struct reiserfs_mount *rmp,
struct reiserfs_node **root);
uint32_t find_hash_out(struct reiserfs_mount *rmp);
MALLOC_DEFINE(M_REISERFSMNT, "reiserfs_mount", "ReiserFS mount structure");
MALLOC_DEFINE(M_REISERFSPATH, "reiserfs_path", "ReiserFS path structure");
MALLOC_DEFINE(M_REISERFSNODE, "reiserfs_node", "ReiserFS vnode private part");
/* -------------------------------------------------------------------
* VFS operations
* -------------------------------------------------------------------*/
static int
reiserfs_cmount(struct mntarg *ma, void *data, uint64_t flags)
{
struct reiserfs_args args;
struct export_args exp;
int error;
error = copyin(data, &args, sizeof(args));
if (error)
return (error);
vfs_oexport_conv(&args.export, &exp);
ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN);
ma = mount_arg(ma, "export", &exp, sizeof(exp));
error = kernel_mount(ma, flags);
return (error);
}
/*
* Mount system call
*/
static int
reiserfs_mount(struct mount *mp)
{
size_t size;
int error, len;
accmode_t accmode;
char *path, *fspec;
struct vnode *devvp;
struct vfsoptlist *opts;
struct reiserfs_mount *rmp;
struct reiserfs_sb_info *sbi;
struct nameidata nd, *ndp = &nd;
struct thread *td;
td = curthread;
if (!(mp->mnt_flag & MNT_RDONLY))
return EROFS;
/* Get the new options passed to mount */
opts = mp->mnt_optnew;
/* `fspath' contains the mount point (eg. /mnt/linux); REQUIRED */
vfs_getopt(opts, "fspath", (void **)&path, NULL);
reiserfs_log(LOG_INFO, "mount point is `%s'\n", path);
/* `from' contains the device name (eg. /dev/ad0s1); REQUIRED */
fspec = NULL;
error = vfs_getopt(opts, "from", (void **)&fspec, &len);
if (!error && fspec[len - 1] != '\0')
return (EINVAL);
reiserfs_log(LOG_INFO, "device is `%s'\n", fspec);
/* Handle MNT_UPDATE (mp->mnt_flag) */
if (mp->mnt_flag & MNT_UPDATE) {
/* For now, only NFS export is supported. */
if (vfs_flagopt(opts, "export", NULL, 0))
return (0);
}
/* Not an update, or updating the name: look up the name
* and verify that it refers to a sensible disk device. */
if (fspec == NULL)
return (EINVAL);
NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td);
if ((error = namei(ndp)) != 0)
return (error);
NDFREE(ndp, NDF_ONLY_PNBUF);
devvp = ndp->ni_vp;
if (!vn_isdisk(devvp, &error)) {
vput(devvp);
return (error);
}
/* If mount by non-root, then verify that user has necessary
* permissions on the device. */
accmode = VREAD;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
accmode |= VWRITE;
error = VOP_ACCESS(devvp, accmode, td->td_ucred, td);
if (error)
error = priv_check(td, PRIV_VFS_MOUNT_PERM);
if (error) {
vput(devvp);
return (error);
}
if ((mp->mnt_flag & MNT_UPDATE) == 0) {
error = reiserfs_mountfs(devvp, mp, td);
} else {
/* TODO Handle MNT_UPDATE */
vput(devvp);
return (EOPNOTSUPP);
}
if (error) {
vrele(devvp);
return (error);
}
rmp = VFSTOREISERFS(mp);
sbi = rmp->rm_reiserfs;
/*
* Note that this strncpy() is ok because of a check at the start
* of reiserfs_mount().
*/
reiserfs_log(LOG_DEBUG, "prepare statfs data\n");
(void)copystr(fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
(void)reiserfs_statfs(mp, &mp->mnt_stat);
reiserfs_log(LOG_DEBUG, "done\n");
return (0);
}
/*
* Unmount system call
*/
static int
reiserfs_unmount(struct mount *mp, int mntflags)
{
int error, flags = 0;
struct reiserfs_mount *rmp;
struct reiserfs_sb_info *sbi;
reiserfs_log(LOG_DEBUG, "get private data\n");
rmp = VFSTOREISERFS(mp);
sbi = rmp->rm_reiserfs;
/* Flangs handling */
reiserfs_log(LOG_DEBUG, "handle mntflags\n");
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
/* Flush files -> vflush */
reiserfs_log(LOG_DEBUG, "flush vnodes\n");
if ((error = vflush(mp, 0, flags, curthread)))
return (error);
/* XXX Super block update */
if (sbi) {
if (SB_AP_BITMAP(sbi)) {
int i;
reiserfs_log(LOG_DEBUG,
"release bitmap buffers (total: %d)\n",
SB_BMAP_NR(sbi));
for (i = 0; i < SB_BMAP_NR(sbi); i++) {
if (SB_AP_BITMAP(sbi)[i].bp_data) {
free(SB_AP_BITMAP(sbi)[i].bp_data,
M_REISERFSMNT);
SB_AP_BITMAP(sbi)[i].bp_data = NULL;
}
}
reiserfs_log(LOG_DEBUG, "free bitmaps structure\n");
free(SB_AP_BITMAP(sbi), M_REISERFSMNT);
SB_AP_BITMAP(sbi) = NULL;
}
if (sbi->s_rs) {
reiserfs_log(LOG_DEBUG, "free super block data\n");
free(sbi->s_rs, M_REISERFSMNT);
sbi->s_rs = NULL;
}
}
reiserfs_log(LOG_DEBUG, "close device\n");
#if defined(si_mountpoint)
rmp->rm_devvp->v_rdev->si_mountpoint = NULL;
#endif
DROP_GIANT();
g_topology_lock();
g_vfs_close(rmp->rm_cp);
g_topology_unlock();
PICKUP_GIANT();
vrele(rmp->rm_devvp);
dev_rel(rmp->rm_dev);
if (sbi) {
reiserfs_log(LOG_DEBUG, "free sbi\n");
free(sbi, M_REISERFSMNT);
sbi = rmp->rm_reiserfs = NULL;
}
if (rmp) {
reiserfs_log(LOG_DEBUG, "free rmp\n");
free(rmp, M_REISERFSMNT);
rmp = NULL;
}
mp->mnt_data = 0;
MNT_ILOCK(mp);
mp->mnt_flag &= ~MNT_LOCAL;
MNT_IUNLOCK(mp);
reiserfs_log(LOG_DEBUG, "done\n");
return (error);
}
/*
* Return the root of a filesystem.
*/
static int
reiserfs_root(struct mount *mp, int flags, struct vnode **vpp)
{
int error;
struct vnode *vp;
struct cpu_key rootkey;
rootkey.on_disk_key.k_dir_id = REISERFS_ROOT_PARENT_OBJECTID;
rootkey.on_disk_key.k_objectid = REISERFS_ROOT_OBJECTID;
error = reiserfs_iget(mp, &rootkey, &vp, curthread);
if (error == 0)
*vpp = vp;
return (error);
}
/*
* The statfs syscall
*/
static int
reiserfs_statfs(struct mount *mp, struct statfs *sbp)
{
struct reiserfs_mount *rmp;
struct reiserfs_sb_info *sbi;
struct reiserfs_super_block *rs;
reiserfs_log(LOG_DEBUG, "get private data\n");
rmp = VFSTOREISERFS(mp);
sbi = rmp->rm_reiserfs;
rs = sbi->s_rs;
reiserfs_log(LOG_DEBUG, "fill statfs structure\n");
sbp->f_bsize = sbi->s_blocksize;
sbp->f_iosize = sbp->f_bsize;
sbp->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
sbp->f_bfree = sb_free_blocks(rs);
sbp->f_bavail = sbp->f_bfree;
sbp->f_files = 0;
sbp->f_ffree = 0;
reiserfs_log(LOG_DEBUG, " block size = %ju\n",
(intmax_t)sbp->f_bsize);
reiserfs_log(LOG_DEBUG, " IO size = %ju\n",
(intmax_t)sbp->f_iosize);
reiserfs_log(LOG_DEBUG, " block count = %ju\n",
(intmax_t)sbp->f_blocks);
reiserfs_log(LOG_DEBUG, " free blocks = %ju\n",
(intmax_t)sbp->f_bfree);
reiserfs_log(LOG_DEBUG, " avail blocks = %ju\n",
(intmax_t)sbp->f_bavail);
reiserfs_log(LOG_DEBUG, "...done\n");
if (sbp != &mp->mnt_stat) {
reiserfs_log(LOG_DEBUG, "copying monut point info\n");
sbp->f_type = mp->mnt_vfc->vfc_typenum;
bcopy((caddr_t)mp->mnt_stat.f_mntonname,
(caddr_t)&sbp->f_mntonname[0], MNAMELEN);
bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
(caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
reiserfs_log(LOG_DEBUG, " mount from: %s\n",
sbp->f_mntfromname);
reiserfs_log(LOG_DEBUG, " mount on: %s\n",
sbp->f_mntonname);
reiserfs_log(LOG_DEBUG, "...done\n");
}
return (0);
}
/*
* File handle to vnode
*
* Have to be really careful about stale file handles:
* - check that the inode key is valid
* - call ffs_vget() to get the locked inode
* - check for an unallocated inode (i_mode == 0)
* - check that the given client host has export rights and return
* those rights via. exflagsp and credanonp
*/
static int
reiserfs_fhtovp(struct mount *mp, struct fid *fhp, int flags,
struct vnode **vpp)
{
int error;
struct rfid *rfhp;
struct vnode *nvp;
struct cpu_key key;
struct reiserfs_node *ip;
struct reiserfs_sb_info *sbi;
struct thread *td = curthread;
rfhp = (struct rfid *)fhp;
sbi = VFSTOREISERFS(mp)->rm_reiserfs;
/* Check that the key is valid */
if (rfhp->rfid_dirid < REISERFS_ROOT_PARENT_OBJECTID &&
rfhp->rfid_objectid < REISERFS_ROOT_OBJECTID)
return (ESTALE);
reiserfs_log(LOG_DEBUG,
"file handle key is (dirid=%d, objectid=%d)\n",
rfhp->rfid_dirid, rfhp->rfid_objectid);
key.on_disk_key.k_dir_id = rfhp->rfid_dirid;
key.on_disk_key.k_objectid = rfhp->rfid_objectid;
reiserfs_log(LOG_DEBUG, "read this inode\n");
error = reiserfs_iget(mp, &key, &nvp, td);
if (error) {
*vpp = NULLVP;
return (error);
}
reiserfs_log(LOG_DEBUG, "check validity\n");
ip = VTOI(nvp);
if (ip->i_mode == 0 || ip->i_generation != rfhp->rfid_gen) {
vput(nvp);
*vpp = NULLVP;
return (ESTALE);
}
reiserfs_log(LOG_DEBUG, "return it\n");
*vpp = nvp;
return (0);
}
/* -------------------------------------------------------------------
* Functions for the journal
* -------------------------------------------------------------------*/
int
is_reiserfs_3_5(struct reiserfs_super_block *rs)
{
return (!strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
strlen(reiserfs_3_5_magic_string)));
}
int
is_reiserfs_3_6(struct reiserfs_super_block *rs)
{
return (!strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
strlen(reiserfs_3_6_magic_string)));
}
int
is_reiserfs_jr(struct reiserfs_super_block *rs)
{
return (!strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
strlen(reiserfs_jr_magic_string)));
}
static int
is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
{
return ((is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
is_reiserfs_jr(rs)));
}
/* -------------------------------------------------------------------
* Internal functions
* -------------------------------------------------------------------*/
/*
* Common code for mount and mountroot
*/
static int
reiserfs_mountfs(struct vnode *devvp, struct mount *mp, struct thread *td)
{
int error, old_format = 0;
struct reiserfs_mount *rmp;
struct reiserfs_sb_info *sbi;
struct reiserfs_super_block *rs;
struct cdev *dev;
struct g_consumer *cp;
struct bufobj *bo;
//ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
dev = devvp->v_rdev;
dev_ref(dev);
DROP_GIANT();
g_topology_lock();
error = g_vfs_open(devvp, &cp, "reiserfs", /* read-only */ 0);
g_topology_unlock();
PICKUP_GIANT();
VOP_UNLOCK(devvp, 0);
if (error) {
dev_rel(dev);
return (error);
}
bo = &devvp->v_bufobj;
bo->bo_private = cp;
bo->bo_ops = g_vfs_bufops;
if (devvp->v_rdev->si_iosize_max != 0)
mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
if (mp->mnt_iosize_max > MAXPHYS)
mp->mnt_iosize_max = MAXPHYS;
rmp = NULL;
sbi = NULL;
/* rmp contains any information about this specific mount */
rmp = malloc(sizeof *rmp, M_REISERFSMNT, M_WAITOK | M_ZERO);
if (!rmp) {
error = (ENOMEM);
goto out;
}
sbi = malloc(sizeof *sbi, M_REISERFSMNT, M_WAITOK | M_ZERO);
if (!sbi) {
error = (ENOMEM);
goto out;
}
rmp->rm_reiserfs = sbi;
rmp->rm_mountp = mp;
rmp->rm_devvp = devvp;
rmp->rm_dev = dev;
rmp->rm_bo = &devvp->v_bufobj;
rmp->rm_cp = cp;
/* Set default values for options: non-aggressive tails */
REISERFS_SB(sbi)->s_mount_opt = (1 << REISERFS_SMALLTAIL);
REISERFS_SB(sbi)->s_rd_only = 1;
REISERFS_SB(sbi)->s_devvp = devvp;
/* Read the super block */
if ((error = read_super_block(rmp, REISERFS_OLD_DISK_OFFSET)) == 0) {
/* The read process succeeded, it's an old format */
old_format = 1;
} else if ((error = read_super_block(rmp, REISERFS_DISK_OFFSET)) != 0) {
reiserfs_log(LOG_ERR, "can not find a ReiserFS filesystem\n");
goto out;
}
rs = SB_DISK_SUPER_BLOCK(sbi);
/*
* Let's do basic sanity check to verify that underlying device is
* not smaller than the filesystem. If the check fails then abort and
* scream, because bad stuff will happen otherwise.
*/
#if 0
if (s->s_bdev && s->s_bdev->bd_inode &&
i_size_read(s->s_bdev->bd_inode) <
sb_block_count(rs) * sb_blocksize(rs)) {
reiserfs_log(LOG_ERR,
"reiserfs: filesystem cannot be mounted because it is "
"bigger than the device.\n");
reiserfs_log(LOG_ERR, "reiserfs: you may need to run fsck "
"rr may be you forgot to reboot after fdisk when it "
"told you to.\n");
goto out;
}
#endif
/*
* XXX This is from the original Linux code, but why affecting 2 values
* to the same variable?
*/
sbi->s_mount_state = SB_REISERFS_STATE(sbi);
sbi->s_mount_state = REISERFS_VALID_FS;
if ((error = (old_format ?
read_old_bitmaps(rmp) : read_bitmaps(rmp)))) {
reiserfs_log(LOG_ERR, "unable to read bitmap\n");
goto out;
}
/* Make data=ordered the default */
if (!reiserfs_data_log(sbi) && !reiserfs_data_ordered(sbi) &&
!reiserfs_data_writeback(sbi)) {
REISERFS_SB(sbi)->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
}
if (reiserfs_data_log(sbi)) {
reiserfs_log(LOG_INFO, "using journaled data mode\n");
} else if (reiserfs_data_ordered(sbi)) {
reiserfs_log(LOG_INFO, "using ordered data mode\n");
} else {
reiserfs_log(LOG_INFO, "using writeback data mode\n");
}
/* TODO Not yet supported */
#if 0
if(journal_init(sbi, jdev_name, old_format, commit_max_age)) {
reiserfs_log(LOG_ERR, "unable to initialize journal space\n");
goto out;
} else {
jinit_done = 1 ; /* once this is set, journal_release must
be called if we error out of the mount */
}
if (reread_meta_blocks(sbi)) {
reiserfs_log(LOG_ERR,
"unable to reread meta blocks after journal init\n");
goto out;
}
#endif
/* Define and initialize hash function */
sbi->s_hash_function = hash_function(rmp);
if (sbi->s_hash_function == NULL) {
reiserfs_log(LOG_ERR, "couldn't determined hash function\n");
error = (EINVAL);
goto out;
}
if (is_reiserfs_3_5(rs) ||
(is_reiserfs_jr(rs) && SB_VERSION(sbi) == REISERFS_VERSION_1))
bit_set(&(sbi->s_properties), REISERFS_3_5);
else
bit_set(&(sbi->s_properties), REISERFS_3_6);
mp->mnt_data = rmp;
mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_LOCAL;
MNT_IUNLOCK(mp);
#if defined(si_mountpoint)
devvp->v_rdev->si_mountpoint = mp;
#endif
return (0);
out:
reiserfs_log(LOG_INFO, "*** error during mount ***\n");
if (sbi) {
if (SB_AP_BITMAP(sbi)) {
int i;
for (i = 0; i < SB_BMAP_NR(sbi); i++) {
if (!SB_AP_BITMAP(sbi)[i].bp_data)
break;
free(SB_AP_BITMAP(sbi)[i].bp_data,
M_REISERFSMNT);
}
free(SB_AP_BITMAP(sbi), M_REISERFSMNT);
}
if (sbi->s_rs) {
free(sbi->s_rs, M_REISERFSMNT);
sbi->s_rs = NULL;
}
}
if (cp != NULL) {
DROP_GIANT();
g_topology_lock();
g_vfs_close(cp);
g_topology_unlock();
PICKUP_GIANT();
}
if (sbi)
free(sbi, M_REISERFSMNT);
if (rmp)
free(rmp, M_REISERFSMNT);
dev_rel(dev);
return (error);
}
/*
* Read the super block
*/
static int
read_super_block(struct reiserfs_mount *rmp, int offset)
{
struct buf *bp;
int error, bits;
struct reiserfs_super_block *rs;
struct reiserfs_sb_info *sbi;
uint16_t fs_blocksize;
if (offset == REISERFS_OLD_DISK_OFFSET) {
reiserfs_log(LOG_DEBUG,
"reiserfs/super: read old format super block\n");
} else {
reiserfs_log(LOG_DEBUG,
"reiserfs/super: read new format super block\n");
}
/* Read the super block */
if ((error = bread(rmp->rm_devvp, offset * btodb(REISERFS_BSIZE),
REISERFS_BSIZE, NOCRED, &bp)) != 0) {
reiserfs_log(LOG_ERR, "can't read device\n");
return (error);
}
/* Get it from the buffer data */
rs = (struct reiserfs_super_block *)bp->b_data;
if (!is_any_reiserfs_magic_string(rs)) {
brelse(bp);
return (EINVAL);
}
fs_blocksize = sb_blocksize(rs);
brelse(bp);
bp = NULL;
if (fs_blocksize <= 0) {
reiserfs_log(LOG_ERR, "unexpected null block size");
return (EINVAL);
}
/* Read the super block (for double check)
* We can't read the same blkno with a different size: it causes
* panic() if INVARIANTS is set. So we keep REISERFS_BSIZE */
if ((error = bread(rmp->rm_devvp,
offset * REISERFS_BSIZE / fs_blocksize * btodb(fs_blocksize),
REISERFS_BSIZE, NOCRED, &bp)) != 0) {
reiserfs_log(LOG_ERR, "can't reread the super block\n");
return (error);
}
rs = (struct reiserfs_super_block *)bp->b_data;
if (sb_blocksize(rs) != fs_blocksize) {
reiserfs_log(LOG_ERR, "unexpected block size "
"(found=%u, expected=%u)\n",
sb_blocksize(rs), fs_blocksize);
brelse(bp);
return (EINVAL);
}
reiserfs_log(LOG_DEBUG, "magic: `%s'\n", rs->s_v1.s_magic);
reiserfs_log(LOG_DEBUG, "label: `%s'\n", rs->s_label);
reiserfs_log(LOG_DEBUG, "block size: %6d\n", sb_blocksize(rs));
reiserfs_log(LOG_DEBUG, "block count: %6u\n",
rs->s_v1.s_block_count);
reiserfs_log(LOG_DEBUG, "bitmaps number: %6u\n",
rs->s_v1.s_bmap_nr);
if (rs->s_v1.s_root_block == -1) {
log(LOG_ERR,
"reiserfs: Unfinished reiserfsck --rebuild-tree run "
"detected. Please\n"
"run reiserfsck --rebuild-tree and wait for a "
"completion. If that\n"
"fails, get newer reiserfsprogs package");
brelse(bp);
return (EINVAL);
}
sbi = rmp->rm_reiserfs;
sbi->s_blocksize = fs_blocksize;
for (bits = 9, fs_blocksize >>= 9; fs_blocksize >>= 1; bits++)
;
sbi->s_blocksize_bits = bits;
/* Copy the buffer and release it */
sbi->s_rs = malloc(sizeof *rs, M_REISERFSMNT, M_WAITOK | M_ZERO);
if (!sbi->s_rs) {
reiserfs_log(LOG_ERR, "can not read the super block\n");
brelse(bp);
return (ENOMEM);
}
bcopy(rs, sbi->s_rs, sizeof(struct reiserfs_super_block));
brelse(bp);
if (is_reiserfs_jr(rs)) {
if (sb_version(rs) == REISERFS_VERSION_2)
reiserfs_log(LOG_INFO, "found reiserfs format \"3.6\""
" with non-standard journal");
else if (sb_version(rs) == REISERFS_VERSION_1)
reiserfs_log(LOG_INFO, "found reiserfs format \"3.5\""
" with non-standard journal");
else {
reiserfs_log(LOG_ERR, "found unknown "
"format \"%u\" of reiserfs with non-standard magic",
sb_version(rs));
return (EINVAL);
}
} else {
/*
* s_version of standard format may contain incorrect
* information, so we just look at the magic string
*/
reiserfs_log(LOG_INFO,
"found reiserfs format \"%s\" with standard journal\n",
is_reiserfs_3_5(rs) ? "3.5" : "3.6");
}
return (0);
}
/*
* load_bitmap_info_data - Sets up the reiserfs_bitmap_info structure
* from disk.
* @sbi - superblock info for this filesystem
* @bi - the bitmap info to be loaded. Requires that bi->bp is valid.
*
* This routine counts how many free bits there are, finding the first
* zero as a side effect. Could also be implemented as a loop of
* test_bit() calls, or a loop of find_first_zero_bit() calls. This
* implementation is similar to find_first_zero_bit(), but doesn't
* return after it finds the first bit. Should only be called on fs
* mount, but should be fairly efficient anyways.
*
* bi->first_zero_hint is considered unset if it == 0, since the bitmap
* itself will invariably occupt block 0 represented in the bitmap. The
* only exception to this is when free_count also == 0, since there will
* be no free blocks at all.
*/
static void
load_bitmap_info_data(struct reiserfs_sb_info *sbi,
struct reiserfs_bitmap_info *bi)
{
unsigned long *cur;
cur = (unsigned long *)bi->bp_data;
while ((char *)cur < (bi->bp_data + sbi->s_blocksize)) {
/*
* No need to scan if all 0's or all 1's.
* Since we're only counting 0's, we can simply ignore
* all 1's
*/
if (*cur == 0) {
if (bi->first_zero_hint == 0) {
bi->first_zero_hint =
((char *)cur - bi->bp_data) << 3;
}
bi->free_count += sizeof(unsigned long) * 8;
} else if (*cur != ~0L) {
int b;
for (b = 0; b < sizeof(unsigned long) * 8; b++) {
if (!reiserfs_test_le_bit(b, cur)) {
bi->free_count++;
if (bi->first_zero_hint == 0)
bi->first_zero_hint =
(((char *)cur -
bi->bp_data) << 3) + b;
}
}
}
cur++;
}
}
/*
* Read the bitmaps
*/
static int
read_bitmaps(struct reiserfs_mount *rmp)
{
int i, bmap_nr;
struct buf *bp = NULL;
struct reiserfs_sb_info *sbi = rmp->rm_reiserfs;
/* Allocate memory for the table of bitmaps */
SB_AP_BITMAP(sbi) =
malloc(sizeof(struct reiserfs_bitmap_info) * SB_BMAP_NR(sbi),
M_REISERFSMNT, M_WAITOK | M_ZERO);
if (!SB_AP_BITMAP(sbi))
return (ENOMEM);
/* Read all the bitmaps */
for (i = 0,
bmap_nr = (REISERFS_DISK_OFFSET_IN_BYTES / sbi->s_blocksize + 1) *
btodb(sbi->s_blocksize);
i < SB_BMAP_NR(sbi); i++, bmap_nr = sbi->s_blocksize * 8 * i) {
SB_AP_BITMAP(sbi)[i].bp_data = malloc(sbi->s_blocksize,
M_REISERFSMNT, M_WAITOK | M_ZERO);
if (!SB_AP_BITMAP(sbi)[i].bp_data)
return (ENOMEM);
bread(rmp->rm_devvp, bmap_nr, sbi->s_blocksize, NOCRED, &bp);
bcopy(bp->b_data, SB_AP_BITMAP(sbi)[i].bp_data,
sbi->s_blocksize);
brelse(bp);
bp = NULL;
/*if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh))
ll_rw_block(READ, 1, &SB_AP_BITMAP(s)[i].bh);*/
}
for (i = 0; i < SB_BMAP_NR(sbi); i++) {
/*if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh)) {
reiserfs_warning(s,"sh-2029: reiserfs read_bitmaps: "
"bitmap block (#%lu) reading failed",
SB_AP_BITMAP(s)[i].bh->b_blocknr);
for (i = 0; i < SB_BMAP_NR(s); i++)
brelse(SB_AP_BITMAP(s)[i].bh);
vfree(SB_AP_BITMAP(s));
SB_AP_BITMAP(s) = NULL;
return 1;
}*/
load_bitmap_info_data(sbi, SB_AP_BITMAP(sbi) + i);
reiserfs_log(LOG_DEBUG,
"%d free blocks (starting at block %ld)\n",
SB_AP_BITMAP(sbi)[i].free_count,
(long)SB_AP_BITMAP(sbi)[i].first_zero_hint);
}
return (0);
}
// TODO Not supported
static int
read_old_bitmaps(struct reiserfs_mount *rmp)
{
return (EOPNOTSUPP);
#if 0
int i;
struct reiserfs_sb_info *sbi = rmp->rm_reiserfs;
struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(sbi);
/* First of bitmap blocks */
int bmp1 = (REISERFS_OLD_DISK_OFFSET / sbi->s_blocksize) *
btodb(sbi->s_blocksize);
/* Read true bitmap */
SB_AP_BITMAP(sbi) =
malloc(sizeof (struct reiserfs_buffer_info *) * sb_bmap_nr(rs),
M_REISERFSMNT, M_WAITOK | M_ZERO);
if (!SB_AP_BITMAP(sbi))
return 1;
for (i = 0; i < sb_bmap_nr(rs); i ++) {
SB_AP_BITMAP(sbi)[i].bp = getblk(rmp->rm_devvp,
(bmp1 + i) * btodb(sbi->s_blocksize), sbi->s_blocksize, 0, 0, 0);
if (!SB_AP_BITMAP(sbi)[i].bp)
return 1;
load_bitmap_info_data(sbi, SB_AP_BITMAP(sbi) + i);
}
return 0;
#endif
}
/* -------------------------------------------------------------------
* Hash detection stuff
* -------------------------------------------------------------------*/
static int
get_root_node(struct reiserfs_mount *rmp, struct reiserfs_node **root)
{
struct reiserfs_node *ip;
struct reiserfs_iget_args args;
/* Allocate the node structure */
reiserfs_log(LOG_DEBUG, "malloc(struct reiserfs_node)\n");
ip = malloc(sizeof(struct reiserfs_node),
M_REISERFSNODE, M_WAITOK | M_ZERO);
/* Fill the structure */
reiserfs_log(LOG_DEBUG, "filling *ip\n");
ip->i_dev = rmp->rm_dev;
ip->i_number = REISERFS_ROOT_OBJECTID;
ip->i_ino = REISERFS_ROOT_PARENT_OBJECTID;
ip->i_reiserfs = rmp->rm_reiserfs;
/* Read the inode */
args.objectid = ip->i_number;
args.dirid = ip->i_ino;
reiserfs_log(LOG_DEBUG, "call reiserfs_read_locked_inode("
"objectid=%d,dirid=%d)\n", args.objectid, args.dirid);
reiserfs_read_locked_inode(ip, &args);
ip->i_devvp = rmp->rm_devvp;
//XXX VREF(ip->i_devvp); Is it necessary ?
*root = ip;
return (0);
}
/*
* If root directory is empty - we set default - Yura's - hash and warn
* about it.
* FIXME: we look for only one name in a directory. If tea and yura both
* have the same value - we ask user to send report to the mailing list
*/
uint32_t find_hash_out(struct reiserfs_mount *rmp)
{
int retval;
struct cpu_key key;
INITIALIZE_PATH(path);
struct reiserfs_node *ip;
struct reiserfs_sb_info *sbi;
struct reiserfs_dir_entry de;
uint32_t hash = DEFAULT_HASH;
get_root_node(rmp, &ip);
if (!ip)
return (UNSET_HASH);
sbi = rmp->rm_reiserfs;
do {
uint32_t teahash, r5hash, yurahash;
reiserfs_log(LOG_DEBUG, "make_cpu_key\n");
make_cpu_key(&key, ip, ~0, TYPE_DIRENTRY, 3);
reiserfs_log(LOG_DEBUG, "search_by_entry_key for "
"key(objectid=%d,dirid=%d)\n",
key.on_disk_key.k_objectid, key.on_disk_key.k_dir_id);
retval = search_by_entry_key(sbi, &key, &path, &de);
if (retval == IO_ERROR) {
pathrelse(&path);
return (UNSET_HASH);
}
if (retval == NAME_NOT_FOUND)
de.de_entry_num--;
reiserfs_log(LOG_DEBUG, "name found\n");
set_de_name_and_namelen(&de);
if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
/* Allow override in this case */
if (reiserfs_rupasov_hash(sbi)) {
hash = YURA_HASH;
}
reiserfs_log(LOG_DEBUG,
"FS seems to be empty, autodetect "
"is using the default hash");
break;
}
r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
teahash = GET_HASH_VALUE(keyed_hash(de.de_name,
de.de_namelen));
yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
if (((teahash == r5hash) &&
(GET_HASH_VALUE(
deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)) ||
((teahash == yurahash) &&
(yurahash ==
GET_HASH_VALUE(
deh_offset(&(de.de_deh[de.de_entry_num]))))) ||
((r5hash == yurahash) &&
(yurahash ==
GET_HASH_VALUE(
deh_offset(&(de.de_deh[de.de_entry_num])))))) {
reiserfs_log(LOG_ERR,
"unable to automatically detect hash "
"function. Please mount with -o "
"hash={tea,rupasov,r5}");
hash = UNSET_HASH;
break;
}
if (GET_HASH_VALUE(
deh_offset(&(de.de_deh[de.de_entry_num]))) == yurahash) {
reiserfs_log(LOG_DEBUG, "detected YURA hash\n");
hash = YURA_HASH;
} else if (GET_HASH_VALUE(
deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash) {
reiserfs_log(LOG_DEBUG, "detected TEA hash\n");
hash = TEA_HASH;
} else if (GET_HASH_VALUE(
deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash) {
reiserfs_log(LOG_DEBUG, "detected R5 hash\n");
hash = R5_HASH;
} else {
reiserfs_log(LOG_WARNING, "unrecognised hash function");
hash = UNSET_HASH;
}
} while (0);
pathrelse(&path);
return (hash);
}
/* Finds out which hash names are sorted with */
static int
what_hash(struct reiserfs_mount *rmp)
{
uint32_t code;
struct reiserfs_sb_info *sbi = rmp->rm_reiserfs;
find_hash_out(rmp);
code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(sbi));
/*
* reiserfs_hash_detect() == true if any of the hash mount options
* were used. We must check them to make sure the user isn't using a
* bad hash value
*/
if (code == UNSET_HASH || reiserfs_hash_detect(sbi))
code = find_hash_out(rmp);
if (code != UNSET_HASH && reiserfs_hash_detect(sbi)) {
/*
* Detection has found the hash, and we must check against
* the mount options
*/
if (reiserfs_rupasov_hash(sbi) && code != YURA_HASH) {
reiserfs_log(LOG_ERR, "error, %s hash detected, "
"unable to force rupasov hash",
reiserfs_hashname(code));
code = UNSET_HASH;
} else if (reiserfs_tea_hash(sbi) && code != TEA_HASH) {
reiserfs_log(LOG_ERR, "error, %s hash detected, "
"unable to force tea hash",
reiserfs_hashname(code));
code = UNSET_HASH;
} else if (reiserfs_r5_hash(sbi) && code != R5_HASH) {
reiserfs_log(LOG_ERR, "error, %s hash detected, "
"unable to force r5 hash",
reiserfs_hashname(code));
code = UNSET_HASH;
}
} else {
/*
* Find_hash_out was not called or could not determine
* the hash
*/
if (reiserfs_rupasov_hash(sbi)) {
code = YURA_HASH;
} else if (reiserfs_tea_hash(sbi)) {
code = TEA_HASH;
} else if (reiserfs_r5_hash(sbi)) {
code = R5_HASH;
}
}
/* TODO Not supported yet */
#if 0
/* If we are mounted RW, and we have a new valid hash code, update
* the super */
if (code != UNSET_HASH &&
!(s->s_flags & MS_RDONLY) &&
code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
}
#endif
return (code);
}
/* Return pointer to appropriate function */
static hashf_t
hash_function(struct reiserfs_mount *rmp)
{
switch (what_hash(rmp)) {
case TEA_HASH:
reiserfs_log(LOG_INFO, "using tea hash to sort names\n");
return (keyed_hash);
case YURA_HASH:
reiserfs_log(LOG_INFO, "using rupasov hash to sort names\n");
return (yura_hash);
case R5_HASH:
reiserfs_log(LOG_INFO, "using r5 hash to sort names\n");
return (r5_hash);
}
return (NULL);
}
/* -------------------------------------------------------------------
* VFS registration
* -------------------------------------------------------------------*/
static struct vfsops reiser_vfsops = {
.vfs_cmount = reiserfs_cmount,
.vfs_mount = reiserfs_mount,
.vfs_unmount = reiserfs_unmount,
//.vfs_checkexp = reiserfs_checkexp,
//.vfs_extattrctl = reiserfs_extattrctl,
.vfs_fhtovp = reiserfs_fhtovp,
//.vfs_quotactl = reiserfs_quotactl,
.vfs_root = reiserfs_root,
//.vfs_start = reiserfs_start,
.vfs_statfs = reiserfs_statfs,
//.vfs_sync = reiserfs_sync,
//.vfs_vget = reiserfs_vget,
};
VFS_SET(reiser_vfsops, reiserfs, VFCF_READONLY);
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