diff options
Diffstat (limited to 'fs/efs')
| -rw-r--r-- | fs/efs/Makefile | 7 | ||||
| -rw-r--r-- | fs/efs/dir.c | 113 | ||||
| -rw-r--r-- | fs/efs/file.c | 60 | ||||
| -rw-r--r-- | fs/efs/inode.c | 305 | ||||
| -rw-r--r-- | fs/efs/namei.c | 110 | ||||
| -rw-r--r-- | fs/efs/super.c | 343 | ||||
| -rw-r--r-- | fs/efs/symlink.c | 58 |
7 files changed, 996 insertions, 0 deletions
diff --git a/fs/efs/Makefile b/fs/efs/Makefile new file mode 100644 index 0000000..963543d --- /dev/null +++ b/fs/efs/Makefile @@ -0,0 +1,7 @@ +# +# Makefile for the linux efs-filesystem routines. +# + +obj-$(CONFIG_EFS_FS) += efs.o + +efs-objs := super.o inode.o namei.o dir.o file.o symlink.o diff --git a/fs/efs/dir.c b/fs/efs/dir.c new file mode 100644 index 0000000..777c614 --- /dev/null +++ b/fs/efs/dir.c @@ -0,0 +1,113 @@ +/* + * dir.c + * + * Copyright (c) 1999 Al Smith + */ + +#include <linux/buffer_head.h> +#include <linux/efs_fs.h> +#include <linux/smp_lock.h> + +static int efs_readdir(struct file *, void *, filldir_t); + +struct file_operations efs_dir_operations = { + .read = generic_read_dir, + .readdir = efs_readdir, +}; + +struct inode_operations efs_dir_inode_operations = { + .lookup = efs_lookup, +}; + +static int efs_readdir(struct file *filp, void *dirent, filldir_t filldir) { + struct inode *inode = filp->f_dentry->d_inode; + struct buffer_head *bh; + + struct efs_dir *dirblock; + struct efs_dentry *dirslot; + efs_ino_t inodenum; + efs_block_t block; + int slot, namelen; + char *nameptr; + + if (inode->i_size & (EFS_DIRBSIZE-1)) + printk(KERN_WARNING "EFS: WARNING: readdir(): directory size not a multiple of EFS_DIRBSIZE\n"); + + lock_kernel(); + + /* work out where this entry can be found */ + block = filp->f_pos >> EFS_DIRBSIZE_BITS; + + /* each block contains at most 256 slots */ + slot = filp->f_pos & 0xff; + + /* look at all blocks */ + while (block < inode->i_blocks) { + /* read the dir block */ + bh = sb_bread(inode->i_sb, efs_bmap(inode, block)); + + if (!bh) { + printk(KERN_ERR "EFS: readdir(): failed to read dir block %d\n", block); + break; + } + + dirblock = (struct efs_dir *) bh->b_data; + + if (be16_to_cpu(dirblock->magic) != EFS_DIRBLK_MAGIC) { + printk(KERN_ERR "EFS: readdir(): invalid directory block\n"); + brelse(bh); + break; + } + + while (slot < dirblock->slots) { + if (dirblock->space[slot] == 0) { + slot++; + continue; + } + + dirslot = (struct efs_dentry *) (((char *) bh->b_data) + EFS_SLOTAT(dirblock, slot)); + + inodenum = be32_to_cpu(dirslot->inode); + namelen = dirslot->namelen; + nameptr = dirslot->name; + +#ifdef DEBUG + printk(KERN_DEBUG "EFS: readdir(): block %d slot %d/%d: inode %u, name \"%s\", namelen %u\n", block, slot, dirblock->slots-1, inodenum, nameptr, namelen); +#endif + if (namelen > 0) { + /* found the next entry */ + filp->f_pos = (block << EFS_DIRBSIZE_BITS) | slot; + + /* copy filename and data in dirslot */ + filldir(dirent, nameptr, namelen, filp->f_pos, inodenum, DT_UNKNOWN); + + /* sanity check */ + if (nameptr - (char *) dirblock + namelen > EFS_DIRBSIZE) { + printk(KERN_WARNING "EFS: directory entry %d exceeds directory block\n", slot); + slot++; + continue; + } + + /* store position of next slot */ + if (++slot == dirblock->slots) { + slot = 0; + block++; + } + brelse(bh); + filp->f_pos = (block << EFS_DIRBSIZE_BITS) | slot; + goto out; + } + slot++; + } + brelse(bh); + + slot = 0; + block++; + } + + filp->f_pos = (block << EFS_DIRBSIZE_BITS) | slot; +out: + unlock_kernel(); + return 0; +} + diff --git a/fs/efs/file.c b/fs/efs/file.c new file mode 100644 index 0000000..5db2012 --- /dev/null +++ b/fs/efs/file.c @@ -0,0 +1,60 @@ +/* + * file.c + * + * Copyright (c) 1999 Al Smith + * + * Portions derived from work (c) 1995,1996 Christian Vogelgsang. + */ + +#include <linux/buffer_head.h> +#include <linux/efs_fs.h> + +int efs_get_block(struct inode *inode, sector_t iblock, + struct buffer_head *bh_result, int create) +{ + int error = -EROFS; + long phys; + + if (create) + return error; + if (iblock >= inode->i_blocks) { +#ifdef DEBUG + /* + * i have no idea why this happens as often as it does + */ + printk(KERN_WARNING "EFS: bmap(): block %d >= %ld (filesize %ld)\n", + block, + inode->i_blocks, + inode->i_size); +#endif + return 0; + } + phys = efs_map_block(inode, iblock); + if (phys) + map_bh(bh_result, inode->i_sb, phys); + return 0; +} + +int efs_bmap(struct inode *inode, efs_block_t block) { + + if (block < 0) { + printk(KERN_WARNING "EFS: bmap(): block < 0\n"); + return 0; + } + + /* are we about to read past the end of a file ? */ + if (!(block < inode->i_blocks)) { +#ifdef DEBUG + /* + * i have no idea why this happens as often as it does + */ + printk(KERN_WARNING "EFS: bmap(): block %d >= %ld (filesize %ld)\n", + block, + inode->i_blocks, + inode->i_size); +#endif + return 0; + } + + return efs_map_block(inode, block); +} diff --git a/fs/efs/inode.c b/fs/efs/inode.c new file mode 100644 index 0000000..180607f --- /dev/null +++ b/fs/efs/inode.c @@ -0,0 +1,305 @@ +/* + * inode.c + * + * Copyright (c) 1999 Al Smith + * + * Portions derived from work (c) 1995,1996 Christian Vogelgsang, + * and from work (c) 1998 Mike Shaver. + */ + +#include <linux/efs_fs.h> +#include <linux/efs_fs_sb.h> +#include <linux/buffer_head.h> +#include <linux/module.h> +#include <linux/fs.h> + +static int efs_readpage(struct file *file, struct page *page) +{ + return block_read_full_page(page,efs_get_block); +} +static sector_t _efs_bmap(struct address_space *mapping, sector_t block) +{ + return generic_block_bmap(mapping,block,efs_get_block); +} +static struct address_space_operations efs_aops = { + .readpage = efs_readpage, + .sync_page = block_sync_page, + .bmap = _efs_bmap +}; + +static inline void extent_copy(efs_extent *src, efs_extent *dst) { + /* + * this is slightly evil. it doesn't just copy + * efs_extent from src to dst, it also mangles + * the bits so that dst ends up in cpu byte-order. + */ + + dst->cooked.ex_magic = (unsigned int) src->raw[0]; + dst->cooked.ex_bn = ((unsigned int) src->raw[1] << 16) | + ((unsigned int) src->raw[2] << 8) | + ((unsigned int) src->raw[3] << 0); + dst->cooked.ex_length = (unsigned int) src->raw[4]; + dst->cooked.ex_offset = ((unsigned int) src->raw[5] << 16) | + ((unsigned int) src->raw[6] << 8) | + ((unsigned int) src->raw[7] << 0); + return; +} + +void efs_read_inode(struct inode *inode) +{ + int i, inode_index; + dev_t device; + u32 rdev; + struct buffer_head *bh; + struct efs_sb_info *sb = SUPER_INFO(inode->i_sb); + struct efs_inode_info *in = INODE_INFO(inode); + efs_block_t block, offset; + struct efs_dinode *efs_inode; + + /* + ** EFS layout: + ** + ** | cylinder group | cylinder group | cylinder group ..etc + ** |inodes|data |inodes|data |inodes|data ..etc + ** + ** work out the inode block index, (considering initially that the + ** inodes are stored as consecutive blocks). then work out the block + ** number of that inode given the above layout, and finally the + ** offset of the inode within that block. + */ + + inode_index = inode->i_ino / + (EFS_BLOCKSIZE / sizeof(struct efs_dinode)); + + block = sb->fs_start + sb->first_block + + (sb->group_size * (inode_index / sb->inode_blocks)) + + (inode_index % sb->inode_blocks); + + offset = (inode->i_ino % + (EFS_BLOCKSIZE / sizeof(struct efs_dinode))) * + sizeof(struct efs_dinode); + + bh = sb_bread(inode->i_sb, block); + if (!bh) { + printk(KERN_WARNING "EFS: bread() failed at block %d\n", block); + goto read_inode_error; + } + + efs_inode = (struct efs_dinode *) (bh->b_data + offset); + + inode->i_mode = be16_to_cpu(efs_inode->di_mode); + inode->i_nlink = be16_to_cpu(efs_inode->di_nlink); + inode->i_uid = (uid_t)be16_to_cpu(efs_inode->di_uid); + inode->i_gid = (gid_t)be16_to_cpu(efs_inode->di_gid); + inode->i_size = be32_to_cpu(efs_inode->di_size); + inode->i_atime.tv_sec = be32_to_cpu(efs_inode->di_atime); + inode->i_mtime.tv_sec = be32_to_cpu(efs_inode->di_mtime); + inode->i_ctime.tv_sec = be32_to_cpu(efs_inode->di_ctime); + inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = 0; + + /* this is the number of blocks in the file */ + if (inode->i_size == 0) { + inode->i_blocks = 0; + } else { + inode->i_blocks = ((inode->i_size - 1) >> EFS_BLOCKSIZE_BITS) + 1; + } + + rdev = be16_to_cpu(efs_inode->di_u.di_dev.odev); + if (rdev == 0xffff) { + rdev = be32_to_cpu(efs_inode->di_u.di_dev.ndev); + if (sysv_major(rdev) > 0xfff) + device = 0; + else + device = MKDEV(sysv_major(rdev), sysv_minor(rdev)); + } else + device = old_decode_dev(rdev); + + /* get the number of extents for this object */ + in->numextents = be16_to_cpu(efs_inode->di_numextents); + in->lastextent = 0; + + /* copy the extents contained within the inode to memory */ + for(i = 0; i < EFS_DIRECTEXTENTS; i++) { + extent_copy(&(efs_inode->di_u.di_extents[i]), &(in->extents[i])); + if (i < in->numextents && in->extents[i].cooked.ex_magic != 0) { + printk(KERN_WARNING "EFS: extent %d has bad magic number in inode %lu\n", i, inode->i_ino); + brelse(bh); + goto read_inode_error; + } + } + + brelse(bh); + +#ifdef DEBUG + printk(KERN_DEBUG "EFS: read_inode(): inode %lu, extents %d, mode %o\n", + inode->i_ino, in->numextents, inode->i_mode); +#endif + + switch (inode->i_mode & S_IFMT) { + case S_IFDIR: + inode->i_op = &efs_dir_inode_operations; + inode->i_fop = &efs_dir_operations; + break; + case S_IFREG: + inode->i_fop = &generic_ro_fops; + inode->i_data.a_ops = &efs_aops; + break; + case S_IFLNK: + inode->i_op = &page_symlink_inode_operations; + inode->i_data.a_ops = &efs_symlink_aops; + break; + case S_IFCHR: + case S_IFBLK: + case S_IFIFO: + init_special_inode(inode, inode->i_mode, device); + break; + default: + printk(KERN_WARNING "EFS: unsupported inode mode %o\n", inode->i_mode); + goto read_inode_error; + break; + } + + return; + +read_inode_error: + printk(KERN_WARNING "EFS: failed to read inode %lu\n", inode->i_ino); + make_bad_inode(inode); + + return; +} + +static inline efs_block_t +efs_extent_check(efs_extent *ptr, efs_block_t block, struct efs_sb_info *sb) { + efs_block_t start; + efs_block_t length; + efs_block_t offset; + + /* + * given an extent and a logical block within a file, + * can this block be found within this extent ? + */ + start = ptr->cooked.ex_bn; + length = ptr->cooked.ex_length; + offset = ptr->cooked.ex_offset; + + if ((block >= offset) && (block < offset+length)) { + return(sb->fs_start + start + block - offset); + } else { + return 0; + } +} + +efs_block_t efs_map_block(struct inode *inode, efs_block_t block) { + struct efs_sb_info *sb = SUPER_INFO(inode->i_sb); + struct efs_inode_info *in = INODE_INFO(inode); + struct buffer_head *bh = NULL; + + int cur, last, first = 1; + int ibase, ioffset, dirext, direxts, indext, indexts; + efs_block_t iblock, result = 0, lastblock = 0; + efs_extent ext, *exts; + + last = in->lastextent; + + if (in->numextents <= EFS_DIRECTEXTENTS) { + /* first check the last extent we returned */ + if ((result = efs_extent_check(&in->extents[last], block, sb))) + return result; + + /* if we only have one extent then nothing can be found */ + if (in->numextents == 1) { + printk(KERN_ERR "EFS: map_block() failed to map (1 extent)\n"); + return 0; + } + + direxts = in->numextents; + + /* + * check the stored extents in the inode + * start with next extent and check forwards + */ + for(dirext = 1; dirext < direxts; dirext++) { + cur = (last + dirext) % in->numextents; + if ((result = efs_extent_check(&in->extents[cur], block, sb))) { + in->lastextent = cur; + return result; + } + } + + printk(KERN_ERR "EFS: map_block() failed to map block %u (dir)\n", block); + return 0; + } + +#ifdef DEBUG + printk(KERN_DEBUG "EFS: map_block(): indirect search for logical block %u\n", block); +#endif + direxts = in->extents[0].cooked.ex_offset; + indexts = in->numextents; + + for(indext = 0; indext < indexts; indext++) { + cur = (last + indext) % indexts; + + /* + * work out which direct extent contains `cur'. + * + * also compute ibase: i.e. the number of the first + * indirect extent contained within direct extent `cur'. + * + */ + ibase = 0; + for(dirext = 0; cur < ibase && dirext < direxts; dirext++) { + ibase += in->extents[dirext].cooked.ex_length * + (EFS_BLOCKSIZE / sizeof(efs_extent)); + } + + if (dirext == direxts) { + /* should never happen */ + printk(KERN_ERR "EFS: couldn't find direct extent for indirect extent %d (block %u)\n", cur, block); + if (bh) brelse(bh); + return 0; + } + + /* work out block number and offset of this indirect extent */ + iblock = sb->fs_start + in->extents[dirext].cooked.ex_bn + + (cur - ibase) / + (EFS_BLOCKSIZE / sizeof(efs_extent)); + ioffset = (cur - ibase) % + (EFS_BLOCKSIZE / sizeof(efs_extent)); + + if (first || lastblock != iblock) { + if (bh) brelse(bh); + + bh = sb_bread(inode->i_sb, iblock); + if (!bh) { + printk(KERN_ERR "EFS: bread() failed at block %d\n", iblock); + return 0; + } +#ifdef DEBUG + printk(KERN_DEBUG "EFS: map_block(): read indirect extent block %d\n", iblock); +#endif + first = 0; + lastblock = iblock; + } + + exts = (efs_extent *) bh->b_data; + + extent_copy(&(exts[ioffset]), &ext); + + if (ext.cooked.ex_magic != 0) { + printk(KERN_ERR "EFS: extent %d has bad magic number in block %d\n", cur, iblock); + if (bh) brelse(bh); + return 0; + } + + if ((result = efs_extent_check(&ext, block, sb))) { + if (bh) brelse(bh); + in->lastextent = cur; + return result; + } + } + if (bh) brelse(bh); + printk(KERN_ERR "EFS: map_block() failed to map block %u (indir)\n", block); + return 0; +} + +MODULE_LICENSE("GPL"); diff --git a/fs/efs/namei.c b/fs/efs/namei.c new file mode 100644 index 0000000..ed4a207 --- /dev/null +++ b/fs/efs/namei.c @@ -0,0 +1,110 @@ +/* + * namei.c + * + * Copyright (c) 1999 Al Smith + * + * Portions derived from work (c) 1995,1996 Christian Vogelgsang. + */ + +#include <linux/buffer_head.h> +#include <linux/string.h> +#include <linux/efs_fs.h> +#include <linux/smp_lock.h> + +static efs_ino_t efs_find_entry(struct inode *inode, const char *name, int len) { + struct buffer_head *bh; + + int slot, namelen; + char *nameptr; + struct efs_dir *dirblock; + struct efs_dentry *dirslot; + efs_ino_t inodenum; + efs_block_t block; + + if (inode->i_size & (EFS_DIRBSIZE-1)) + printk(KERN_WARNING "EFS: WARNING: find_entry(): directory size not a multiple of EFS_DIRBSIZE\n"); + + for(block = 0; block < inode->i_blocks; block++) { + + bh = sb_bread(inode->i_sb, efs_bmap(inode, block)); + if (!bh) { + printk(KERN_ERR "EFS: find_entry(): failed to read dir block %d\n", block); + return 0; + } + + dirblock = (struct efs_dir *) bh->b_data; + + if (be16_to_cpu(dirblock->magic) != EFS_DIRBLK_MAGIC) { + printk(KERN_ERR "EFS: find_entry(): invalid directory block\n"); + brelse(bh); + return(0); + } + + for(slot = 0; slot < dirblock->slots; slot++) { + dirslot = (struct efs_dentry *) (((char *) bh->b_data) + EFS_SLOTAT(dirblock, slot)); + + namelen = dirslot->namelen; + nameptr = dirslot->name; + + if ((namelen == len) && (!memcmp(name, nameptr, len))) { + inodenum = be32_to_cpu(dirslot->inode); + brelse(bh); + return(inodenum); + } + } + brelse(bh); + } + return(0); +} + +struct dentry *efs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { + efs_ino_t inodenum; + struct inode * inode = NULL; + + lock_kernel(); + inodenum = efs_find_entry(dir, dentry->d_name.name, dentry->d_name.len); + if (inodenum) { + if (!(inode = iget(dir->i_sb, inodenum))) { + unlock_kernel(); + return ERR_PTR(-EACCES); + } + } + unlock_kernel(); + + d_add(dentry, inode); + return NULL; +} + +struct dentry *efs_get_parent(struct dentry *child) +{ + struct dentry *parent; + struct inode *inode; + efs_ino_t ino; + int error; + + lock_kernel(); + + error = -ENOENT; + ino = efs_find_entry(child->d_inode, "..", 2); + if (!ino) + goto fail; + + error = -EACCES; + inode = iget(child->d_inode->i_sb, ino); + if (!inode) + goto fail; + + error = -ENOMEM; + parent = d_alloc_anon(inode); + if (!parent) + goto fail_iput; + + unlock_kernel(); + return parent; + + fail_iput: + iput(inode); + fail: + unlock_kernel(); + return ERR_PTR(error); +} diff --git a/fs/efs/super.c b/fs/efs/super.c new file mode 100644 index 0000000..d8d5ea9 --- /dev/null +++ b/fs/efs/super.c @@ -0,0 +1,343 @@ +/* + * super.c + * + * Copyright (c) 1999 Al Smith + * + * Portions derived from work (c) 1995,1996 Christian Vogelgsang. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/efs_fs.h> +#include <linux/efs_vh.h> +#include <linux/efs_fs_sb.h> +#include <linux/slab.h> +#include <linux/buffer_head.h> +#include <linux/vfs.h> + +static int efs_statfs(struct super_block *s, struct kstatfs *buf); +static int efs_fill_super(struct super_block *s, void *d, int silent); + +static struct super_block *efs_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return get_sb_bdev(fs_type, flags, dev_name, data, efs_fill_super); +} + +static struct file_system_type efs_fs_type = { + .owner = THIS_MODULE, + .name = "efs", + .get_sb = efs_get_sb, + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, +}; + +static struct pt_types sgi_pt_types[] = { + {0x00, "SGI vh"}, + {0x01, "SGI trkrepl"}, + {0x02, "SGI secrepl"}, + {0x03, "SGI raw"}, + {0x04, "SGI bsd"}, + {SGI_SYSV, "SGI sysv"}, + {0x06, "SGI vol"}, + {SGI_EFS, "SGI efs"}, + {0x08, "SGI lv"}, + {0x09, "SGI rlv"}, + {0x0A, "SGI xfs"}, + {0x0B, "SGI xfslog"}, + {0x0C, "SGI xlv"}, + {0x82, "Linux swap"}, + {0x83, "Linux native"}, + {0, NULL} +}; + + +static kmem_cache_t * efs_inode_cachep; + +static struct inode *efs_alloc_inode(struct super_block *sb) +{ + struct efs_inode_info *ei; + ei = (struct efs_inode_info *)kmem_cache_alloc(efs_inode_cachep, SLAB_KERNEL); + if (!ei) + return NULL; + return &ei->vfs_inode; +} + +static void efs_destroy_inode(struct inode *inode) +{ + kmem_cache_free(efs_inode_cachep, INODE_INFO(inode)); +} + +static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) +{ + struct efs_inode_info *ei = (struct efs_inode_info *) foo; + + if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == + SLAB_CTOR_CONSTRUCTOR) + inode_init_once(&ei->vfs_inode); +} + +static int init_inodecache(void) +{ + efs_inode_cachep = kmem_cache_create("efs_inode_cache", + sizeof(struct efs_inode_info), + 0, SLAB_RECLAIM_ACCOUNT, + init_once, NULL); + if (efs_inode_cachep == NULL) + return -ENOMEM; + return 0; +} + +static void destroy_inodecache(void) +{ + if (kmem_cache_destroy(efs_inode_cachep)) + printk(KERN_INFO "efs_inode_cache: not all structures were freed\n"); +} + +static void efs_put_super(struct super_block *s) +{ + kfree(s->s_fs_info); + s->s_fs_info = NULL; +} + +static int efs_remount(struct super_block *sb, int *flags, char *data) +{ + *flags |= MS_RDONLY; + return 0; +} + +static struct super_operations efs_superblock_operations = { + .alloc_inode = efs_alloc_inode, + .destroy_inode = efs_destroy_inode, + .read_inode = efs_read_inode, + .put_super = efs_put_super, + .statfs = efs_statfs, + .remount_fs = efs_remount, +}; + +static struct export_operations efs_export_ops = { + .get_parent = efs_get_parent, +}; + +static int __init init_efs_fs(void) { + int err; + printk("EFS: "EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n"); + err = init_inodecache(); + if (err) + goto out1; + err = register_filesystem(&efs_fs_type); + if (err) + goto out; + return 0; +out: + destroy_inodecache(); +out1: + return err; +} + +static void __exit exit_efs_fs(void) { + unregister_filesystem(&efs_fs_type); + destroy_inodecache(); +} + +module_init(init_efs_fs) +module_exit(exit_efs_fs) + +static efs_block_t efs_validate_vh(struct volume_header *vh) { + int i; + __be32 cs, *ui; + int csum; + efs_block_t sblock = 0; /* shuts up gcc */ + struct pt_types *pt_entry; + int pt_type, slice = -1; + + if (be32_to_cpu(vh->vh_magic) != VHMAGIC) { + /* + * assume that we're dealing with a partition and allow + * read_super() to try and detect a valid superblock + * on the next block. + */ + return 0; + } + + ui = ((__be32 *) (vh + 1)) - 1; + for(csum = 0; ui >= ((__be32 *) vh);) { + cs = *ui--; + csum += be32_to_cpu(cs); + } + if (csum) { + printk(KERN_INFO "EFS: SGI disklabel: checksum bad, label corrupted\n"); + return 0; + } + +#ifdef DEBUG + printk(KERN_DEBUG "EFS: bf: \"%16s\"\n", vh->vh_bootfile); + + for(i = 0; i < NVDIR; i++) { + int j; + char name[VDNAMESIZE+1]; + + for(j = 0; j < VDNAMESIZE; j++) { + name[j] = vh->vh_vd[i].vd_name[j]; + } + name[j] = (char) 0; + + if (name[0]) { + printk(KERN_DEBUG "EFS: vh: %8s block: 0x%08x size: 0x%08x\n", + name, + (int) be32_to_cpu(vh->vh_vd[i].vd_lbn), + (int) be32_to_cpu(vh->vh_vd[i].vd_nbytes)); + } + } +#endif + + for(i = 0; i < NPARTAB; i++) { + pt_type = (int) be32_to_cpu(vh->vh_pt[i].pt_type); + for(pt_entry = sgi_pt_types; pt_entry->pt_name; pt_entry++) { + if (pt_type == pt_entry->pt_type) break; + } +#ifdef DEBUG + if (be32_to_cpu(vh->vh_pt[i].pt_nblks)) { + printk(KERN_DEBUG "EFS: pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n", + i, + (int) be32_to_cpu(vh->vh_pt[i].pt_firstlbn), + (int) be32_to_cpu(vh->vh_pt[i].pt_nblks), + pt_type, + (pt_entry->pt_name) ? pt_entry->pt_name : "unknown"); + } +#endif + if (IS_EFS(pt_type)) { + sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn); + slice = i; + } + } + + if (slice == -1) { + printk(KERN_NOTICE "EFS: partition table contained no EFS partitions\n"); +#ifdef DEBUG + } else { + printk(KERN_INFO "EFS: using slice %d (type %s, offset 0x%x)\n", + slice, + (pt_entry->pt_name) ? pt_entry->pt_name : "unknown", + sblock); +#endif + } + return(sblock); +} + +static int efs_validate_super(struct efs_sb_info *sb, struct efs_super *super) { + + if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic))) return -1; + + sb->fs_magic = be32_to_cpu(super->fs_magic); + sb->total_blocks = be32_to_cpu(super->fs_size); + sb->first_block = be32_to_cpu(super->fs_firstcg); + sb->group_size = be32_to_cpu(super->fs_cgfsize); + sb->data_free = be32_to_cpu(super->fs_tfree); + sb->inode_free = be32_to_cpu(super->fs_tinode); + sb->inode_blocks = be16_to_cpu(super->fs_cgisize); + sb->total_groups = be16_to_cpu(super->fs_ncg); + + return 0; +} + +static int efs_fill_super(struct super_block *s, void *d, int silent) +{ + struct efs_sb_info *sb; + struct buffer_head *bh; + struct inode *root; + + sb = kmalloc(sizeof(struct efs_sb_info), GFP_KERNEL); + if (!sb) + return -ENOMEM; + s->s_fs_info = sb; + memset(sb, 0, sizeof(struct efs_sb_info)); + + s->s_magic = EFS_SUPER_MAGIC; + if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) { + printk(KERN_ERR "EFS: device does not support %d byte blocks\n", + EFS_BLOCKSIZE); + goto out_no_fs_ul; + } + + /* read the vh (volume header) block */ + bh = sb_bread(s, 0); + + if (!bh) { + printk(KERN_ERR "EFS: cannot read volume header\n"); + goto out_no_fs_ul; + } + + /* + * if this returns zero then we didn't find any partition table. + * this isn't (yet) an error - just assume for the moment that + * the device is valid and go on to search for a superblock. + */ + sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data); + brelse(bh); + + if (sb->fs_start == -1) { + goto out_no_fs_ul; + } + + bh = sb_bread(s, sb->fs_start + EFS_SUPER); + if (!bh) { + printk(KERN_ERR "EFS: cannot read superblock\n"); + goto out_no_fs_ul; + } + + if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) { +#ifdef DEBUG + printk(KERN_WARNING "EFS: invalid superblock at block %u\n", sb->fs_start + EFS_SUPER); +#endif + brelse(bh); + goto out_no_fs_ul; + } + brelse(bh); + + if (!(s->s_flags & MS_RDONLY)) { +#ifdef DEBUG + printk(KERN_INFO "EFS: forcing read-only mode\n"); +#endif + s->s_flags |= MS_RDONLY; + } + s->s_op = &efs_superblock_operations; + s->s_export_op = &efs_export_ops; + root = iget(s, EFS_ROOTINODE); + s->s_root = d_alloc_root(root); + + if (!(s->s_root)) { + printk(KERN_ERR "EFS: get root inode failed\n"); + iput(root); + goto out_no_fs; + } + + return 0; + +out_no_fs_ul: +out_no_fs: + s->s_fs_info = NULL; + kfree(sb); + return -EINVAL; +} + +static int efs_statfs(struct super_block *s, struct kstatfs *buf) { + struct efs_sb_info *sb = SUPER_INFO(s); + + buf->f_type = EFS_SUPER_MAGIC; /* efs magic number */ + buf->f_bsize = EFS_BLOCKSIZE; /* blocksize */ + buf->f_blocks = sb->total_groups * /* total data blocks */ + (sb->group_size - sb->inode_blocks); + buf->f_bfree = sb->data_free; /* free data blocks */ + buf->f_bavail = sb->data_free; /* free blocks for non-root */ + buf->f_files = sb->total_groups * /* total inodes */ + sb->inode_blocks * + (EFS_BLOCKSIZE / sizeof(struct efs_dinode)); + buf->f_ffree = sb->inode_free; /* free inodes */ + buf->f_fsid.val[0] = (sb->fs_magic >> 16) & 0xffff; /* fs ID */ + buf->f_fsid.val[1] = sb->fs_magic & 0xffff; /* fs ID */ + buf->f_namelen = EFS_MAXNAMELEN; /* max filename length */ + + return 0; +} + diff --git a/fs/efs/symlink.c b/fs/efs/symlink.c new file mode 100644 index 0000000..3d9a350 --- /dev/null +++ b/fs/efs/symlink.c @@ -0,0 +1,58 @@ +/* + * symlink.c + * + * Copyright (c) 1999 Al Smith + * + * Portions derived from work (c) 1995,1996 Christian Vogelgsang. + */ + +#include <linux/string.h> +#include <linux/efs_fs.h> +#include <linux/pagemap.h> +#include <linux/buffer_head.h> +#include <linux/smp_lock.h> + +static int efs_symlink_readpage(struct file *file, struct page *page) +{ + char *link = kmap(page); + struct buffer_head * bh; + struct inode * inode = page->mapping->host; + efs_block_t size = inode->i_size; + int err; + + err = -ENAMETOOLONG; + if (size > 2 * EFS_BLOCKSIZE) + goto fail; + + lock_kernel(); + /* read first 512 bytes of link target */ + err = -EIO; + bh = sb_bread(inode->i_sb, efs_bmap(inode, 0)); + if (!bh) + goto fail; + memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size); + brelse(bh); + if (size > EFS_BLOCKSIZE) { + bh = sb_bread(inode->i_sb, efs_bmap(inode, 1)); + if (!bh) + goto fail; + memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE); + brelse(bh); + } + link[size] = '\0'; + unlock_kernel(); + SetPageUptodate(page); + kunmap(page); + unlock_page(page); + return 0; +fail: + unlock_kernel(); + SetPageError(page); + kunmap(page); + unlock_page(page); + return err; +} + +struct address_space_operations efs_symlink_aops = { + .readpage = efs_symlink_readpage +}; |
