diff options
Diffstat (limited to 'sys/gnu/fs/reiserfs/reiserfs_vnops.c')
| -rw-r--r-- | sys/gnu/fs/reiserfs/reiserfs_vnops.c | 387 |
1 files changed, 387 insertions, 0 deletions
diff --git a/sys/gnu/fs/reiserfs/reiserfs_vnops.c b/sys/gnu/fs/reiserfs/reiserfs_vnops.c new file mode 100644 index 0000000..8ac1910 --- /dev/null +++ b/sys/gnu/fs/reiserfs/reiserfs_vnops.c @@ -0,0 +1,387 @@ +/*- + * 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> + +static vop_access_t reiserfs_access; +static vop_bmap_t reiserfs_bmap; +static vop_getattr_t reiserfs_getattr; +static vop_open_t reiserfs_open; +static vop_pathconf_t reiserfs_pathconf; +static vop_readlink_t reiserfs_readlink; +static vop_strategy_t reiserfs_strategy; +static vop_vptofh_t reiserfs_vptofh; + +/* Global vfs data structures for ReiserFS */ +struct vop_vector reiserfs_vnodeops = { + .vop_default = &default_vnodeops, + + .vop_access = reiserfs_access, + .vop_bmap = reiserfs_bmap, + .vop_cachedlookup = reiserfs_lookup, + .vop_getattr = reiserfs_getattr, + .vop_inactive = reiserfs_inactive, + .vop_lookup = vfs_cache_lookup, + .vop_open = reiserfs_open, + .vop_reclaim = reiserfs_reclaim, + .vop_read = reiserfs_read, + .vop_readdir = reiserfs_readdir, + .vop_readlink = reiserfs_readlink, + .vop_pathconf = reiserfs_pathconf, + .vop_strategy = reiserfs_strategy, + .vop_vptofh = reiserfs_vptofh, +}; + +struct vop_vector reiserfs_specops = { + .vop_default = &default_vnodeops, + + .vop_access = reiserfs_access, + .vop_getattr = reiserfs_getattr, + .vop_inactive = reiserfs_inactive, + .vop_reclaim = reiserfs_reclaim, +}; + +/* ------------------------------------------------------------------- + * vnode operations + * -------------------------------------------------------------------*/ + +static int +reiserfs_access(struct vop_access_args *ap) +{ + int error; + struct vnode *vp = ap->a_vp; + struct reiserfs_node *ip = VTOI(vp); + accmode_t accmode = ap->a_accmode; + + /* + * Disallow write attempts on read-only file systems; unless the file + * is a socket, fifo, or a block or character device resident on the + * file system. + */ + if (accmode & VWRITE) { + switch (vp->v_type) { + case VDIR: + case VLNK: + case VREG: + if (vp->v_mount->mnt_flag & MNT_RDONLY) { + reiserfs_log(LOG_DEBUG, + "no write access (read-only fs)\n"); + return (EROFS); + } + break; + default: + break; + } + } + + /* If immutable bit set, nobody gets to write it. */ + if ((accmode & VWRITE) && (ip->i_flags & (IMMUTABLE | SF_SNAPSHOT))) { + reiserfs_log(LOG_DEBUG, "no write access (immutable)\n"); + return (EPERM); + } + + error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid, + ap->a_accmode, ap->a_cred, NULL); + return (error); +} + +static int +reiserfs_getattr(struct vop_getattr_args *ap) +{ + struct vnode *vp = ap->a_vp; + struct vattr *vap = ap->a_vap; + struct reiserfs_node *ip = VTOI(vp); + + vap->va_fsid = dev2udev(ip->i_dev); + vap->va_fileid = ip->i_number; + vap->va_mode = ip->i_mode & ~S_IFMT; + vap->va_nlink = ip->i_nlink; + vap->va_uid = ip->i_uid; + vap->va_gid = ip->i_gid; + //XXX vap->va_rdev = ip->i_rdev; + vap->va_size = ip->i_size; + vap->va_atime = ip->i_atime; + vap->va_mtime = ip->i_mtime; + vap->va_ctime = ip->i_ctime; + vap->va_flags = ip->i_flags; + vap->va_gen = ip->i_generation; + vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize; + vap->va_bytes = dbtob((u_quad_t)ip->i_blocks); + vap->va_type = vp->v_type; + //XXX vap->va_filerev = ip->i_modrev; + + return (0); +} + +/* Return POSIX pathconf information applicable to ReiserFS filesystems */ +static int +reiserfs_pathconf(struct vop_pathconf_args *ap) +{ + switch (ap->a_name) { + case _PC_LINK_MAX: + *ap->a_retval = REISERFS_LINK_MAX; + return (0); + case _PC_NAME_MAX: + *ap->a_retval = + REISERFS_MAX_NAME(VTOI(ap->a_vp)->i_reiserfs->s_blocksize); + return (0); + case _PC_PATH_MAX: + *ap->a_retval = PATH_MAX; + return (0); + case _PC_PIPE_BUF: + *ap->a_retval = PIPE_BUF; + return (0); + case _PC_CHOWN_RESTRICTED: + *ap->a_retval = 1; + return (0); + case _PC_NO_TRUNC: + *ap->a_retval = 1; + return (0); + default: + return (EINVAL); + } +} + +static int +reiserfs_open(struct vop_open_args *ap) +{ + /* Files marked append-only must be opened for appending. */ + if ((VTOI(ap->a_vp)->i_flags & APPEND) && + (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE) + return (EPERM); + + vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td); + + return (0); +} + +/* Return target name of a symbolic link */ +static int +reiserfs_readlink(struct vop_readlink_args *ap) +{ + struct vnode *vp = ap->a_vp; + + reiserfs_log(LOG_DEBUG, "redirect to VOP_READ()\n"); + return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred)); +} + +/* Bmap converts the logical block number of a file to its physical + * block number on the disk. */ +static int +reiserfs_bmap(ap) + struct vop_bmap_args /* { + struct vnode *a_vp; + daddr_t a_bn; + struct bufobj **a_bop; + daddr_t *a_bnp; + int *a_runp; + int *a_runb; + } */ *ap; +{ + daddr_t blkno; + struct buf *bp; + struct cpu_key key; + struct item_head *ih; + + struct vnode *vp = ap->a_vp; + struct reiserfs_node *ip = VTOI(vp); + struct reiserfs_sb_info *sbi = ip->i_reiserfs; + INITIALIZE_PATH(path); + + /* Prepare the key to look for the 'block'-th block of file + * (XXX we suppose that statfs.f_iosize == sbi->s_blocksize) */ + make_cpu_key(&key, ip, (off_t)ap->a_bn * sbi->s_blocksize + 1, + TYPE_ANY, 3); + + /* Search item */ + if (search_for_position_by_key(sbi, &key, &path) != POSITION_FOUND) { + reiserfs_log(LOG_DEBUG, "position not found\n"); + pathrelse(&path); + return (ENOENT); + } + + bp = get_last_bp(&path); + ih = get_ih(&path); + + if (is_indirect_le_ih(ih)) { + /* Indirect item can be read by the underlying layer, instead of + * VOP_STRATEGY. */ + int i; + uint32_t *ind_item = (uint32_t *)B_I_PITEM(bp, ih); + reiserfs_log(LOG_DEBUG, "found an INDIRECT item\n"); + blkno = get_block_num(ind_item, path.pos_in_item); + + /* Read-ahead */ + if (ap->a_runb) { + uint32_t count = 0; + for (i = path.pos_in_item - 1; i >= 0; --i) { + if ((blkno - get_block_num(ind_item, i)) != + count + 1) + break; + ++count; + } + + /* + * This count isn't expressed in DEV_BSIZE base but + * in fs' own block base + * (see sys/vm/vnode_pager.c:vnode_pager_addr()) + */ + *ap->a_runb = count; + reiserfs_log(LOG_DEBUG, + " read-ahead: %d blocks before\n", *ap->a_runb); + } + if (ap->a_runp) { + uint32_t count = 0; + /* + * ih is an uint32_t array, that's why we use + * its length (in bytes) divided by 4 to know + * the number of items + */ + for (i = path.pos_in_item + 1; + i < ih_item_len(ih) / 4; ++i) { + if ((get_block_num(ind_item, i) - blkno) != + count + 1) + break; + ++count; + } + + /* + * This count isn't expressed in DEV_BSIZE base but + * in fs' own block base + * (see sys/vm/vnode_pager.c:vnode_pager_addr()) */ + *ap->a_runp = count; + reiserfs_log(LOG_DEBUG, + " read-ahead: %d blocks after\n", *ap->a_runp); + } + + /* Indirect items can be read using the device VOP_STRATEGY */ + if (ap->a_bop) + *ap->a_bop = &VTOI(ap->a_vp)->i_devvp->v_bufobj; + + /* Convert the block number into DEV_BSIZE base */ + blkno *= btodb(sbi->s_blocksize); + } else { + /* + * Direct item are not DEV_BSIZE aligned, VOP_STRATEGY will + * have to handle this case specifically + */ + reiserfs_log(LOG_DEBUG, "found a DIRECT item\n"); + blkno = ap->a_bn; + + if (ap->a_runp) + *ap->a_runp = 0; + if (ap->a_runb) + *ap->a_runb = 0; + + /* Direct item must be read by reiserfs_strategy */ + if (ap->a_bop) + *ap->a_bop = &vp->v_bufobj; + } + + if (ap->a_bnp) + *ap->a_bnp = blkno; + + pathrelse(&path); + + if (ap->a_bnp) { + reiserfs_log(LOG_DEBUG, "logical block: %ju (%ju)," + " physical block: %ju (%ju)\n", + (intmax_t)ap->a_bn, + (intmax_t)(ap->a_bn / btodb(sbi->s_blocksize)), + (intmax_t)*ap->a_bnp, + (intmax_t)(*ap->a_bnp / btodb(sbi->s_blocksize))); + } + + return (0); +} + +/* Does simply the same as reiserfs_read. It's called when reiserfs_bmap find + * an direct item. */ +static int +reiserfs_strategy(struct vop_strategy_args /* { + struct vnode *a_vp; + struct buf *a_bp; + } */ *ap) +{ + int error; + struct uio auio; + struct iovec aiov; + struct reiserfs_node *ip; + struct buf *bp = ap->a_bp; + struct vnode *vp = ap->a_vp; + + reiserfs_log(LOG_DEBUG, "logical block: %ju," + " physical block: %ju\n", (intmax_t)bp->b_lblkno, + (intmax_t)bp->b_blkno); + + ip = VTOI(vp); + + if (bp->b_iocmd == BIO_READ) { + /* Prepare the uio structure */ + reiserfs_log(LOG_DEBUG, "prepare uio structure\n"); + aiov.iov_base = bp->b_data; + aiov.iov_len = MIN(bp->b_bcount, ip->i_size); + reiserfs_log(LOG_DEBUG, " vector length: %ju\n", + (intmax_t)aiov.iov_len); + + auio.uio_iov = &aiov; + auio.uio_iovcnt = 1; + auio.uio_offset = 0; + auio.uio_rw = UIO_READ; + auio.uio_segflg = UIO_SYSSPACE; + auio.uio_td = curthread; + auio.uio_resid = bp->b_bcount; + reiserfs_log(LOG_DEBUG, " buffer length: %u\n", + auio.uio_resid); + + reiserfs_log(LOG_DEBUG, "reading block #%ju\n", + (intmax_t)bp->b_blkno); + error = reiserfs_get_block(ip, bp->b_blkno, 0, &auio); + } else { + /* No write support yet */ + error = (EOPNOTSUPP); + bp->b_error = error; + bp->b_ioflags |= BIO_ERROR; + } + + if (error) { + bp->b_ioflags |= BIO_ERROR; + bp->b_error = error; + } + + bufdone(bp); + return (0); +} + +/* + * Vnode pointer to File handle + */ +static int +reiserfs_vptofh(struct vop_vptofh_args /* { + struct vnode *a_vp; + struct fid *a_fhp; + } */ *ap) +{ + struct rfid *rfhp; + struct reiserfs_node *ip; + + ip = VTOI(ap->a_vp); + reiserfs_log(LOG_DEBUG, + "fill *fhp with inode (dirid=%d, objectid=%d)\n", + ip->i_ino, ip->i_number); + + rfhp = (struct rfid *)ap->a_fhp; + rfhp->rfid_len = sizeof(struct rfid); + rfhp->rfid_dirid = ip->i_ino; + rfhp->rfid_objectid = ip->i_number; + rfhp->rfid_gen = ip->i_generation; + + reiserfs_log(LOG_DEBUG, "return it\n"); + return (0); +} |
