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-rw-r--r--grub-core/fs/jfs.c908
1 files changed, 908 insertions, 0 deletions
diff --git a/grub-core/fs/jfs.c b/grub-core/fs/jfs.c
new file mode 100644
index 0000000..72e6adc
--- /dev/null
+++ b/grub-core/fs/jfs.c
@@ -0,0 +1,908 @@
+/* jfs.c - JFS. */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2004,2005,2006,2007,2008,2009 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/err.h>
+#include <grub/file.h>
+#include <grub/mm.h>
+#include <grub/misc.h>
+#include <grub/disk.h>
+#include <grub/dl.h>
+#include <grub/types.h>
+#include <grub/charset.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+#define GRUB_JFS_MAX_SYMLNK_CNT 8
+#define GRUB_JFS_FILETYPE_MASK 0170000
+#define GRUB_JFS_FILETYPE_REG 0100000
+#define GRUB_JFS_FILETYPE_LNK 0120000
+#define GRUB_JFS_FILETYPE_DIR 0040000
+
+#define GRUB_JFS_SBLOCK 64
+#define GRUB_JFS_AGGR_INODE 2
+#define GRUB_JFS_FS1_INODE_BLK 104
+
+#define GRUB_JFS_TREE_LEAF 2
+
+struct grub_jfs_sblock
+{
+ /* The magic for JFS. It should contain the string "JFS1". */
+ grub_uint8_t magic[4];
+ grub_uint32_t version;
+ grub_uint64_t ag_size;
+
+ /* The size of a filesystem block in bytes. XXX: currently only
+ 4096 was tested. */
+ grub_uint32_t blksz;
+ grub_uint16_t log2_blksz;
+
+ grub_uint8_t unused[71];
+ grub_uint8_t volname[11];
+ grub_uint8_t unused2[32];
+ grub_uint8_t uuid[16];
+};
+
+struct grub_jfs_extent
+{
+ /* The length of the extent in filesystem blocks. */
+ grub_uint16_t length;
+ grub_uint8_t length2;
+
+ /* The physical offset of the first block on the disk. */
+ grub_uint8_t blk1;
+ grub_uint32_t blk2;
+} __attribute__ ((packed));
+
+struct grub_jfs_iag
+{
+ grub_uint8_t unused[3072];
+ struct grub_jfs_extent inodes[128];
+} __attribute__ ((packed));
+
+
+/* The head of the tree used to find extents. */
+struct grub_jfs_treehead
+{
+ grub_uint64_t next;
+ grub_uint64_t prev;
+
+ grub_uint8_t flags;
+ grub_uint8_t unused;
+
+ grub_uint16_t count;
+ grub_uint16_t max;
+ grub_uint8_t unused2[10];
+} __attribute__ ((packed));
+
+/* A node in the extent tree. */
+struct grub_jfs_tree_extent
+{
+ grub_uint8_t flags;
+ grub_uint16_t unused;
+
+ /* The offset is the key used to lookup an extent. */
+ grub_uint8_t offset1;
+ grub_uint32_t offset2;
+
+ struct grub_jfs_extent extent;
+} __attribute__ ((packed));
+
+/* The tree of directory entries. */
+struct grub_jfs_tree_dir
+{
+ /* Pointers to the previous and next tree headers of other nodes on
+ this level. */
+ grub_uint64_t nextb;
+ grub_uint64_t prevb;
+
+ grub_uint8_t flags;
+
+ /* The amount of dirents in this node. */
+ grub_uint8_t count;
+ grub_uint8_t freecnt;
+ grub_uint8_t freelist;
+ grub_uint8_t maxslot;
+
+ /* The location of the sorted array of pointers to dirents. */
+ grub_uint8_t sindex;
+ grub_uint8_t unused[10];
+} __attribute__ ((packed));
+
+/* An internal node in the dirents tree. */
+struct grub_jfs_internal_dirent
+{
+ struct grub_jfs_extent ex;
+ grub_uint8_t next;
+ grub_uint8_t len;
+ grub_uint16_t namepart[11];
+} __attribute__ ((packed));
+
+/* A leaf node in the dirents tree. */
+struct grub_jfs_leaf_dirent
+{
+ /* The inode for this dirent. */
+ grub_uint32_t inode;
+ grub_uint8_t next;
+
+ /* The size of the name. */
+ grub_uint8_t len;
+ grub_uint16_t namepart[11];
+ grub_uint32_t index;
+} __attribute__ ((packed));
+
+/* A leaf in the dirents tree. This one is used if the previously
+ dirent was not big enough to store the name. */
+struct grub_jfs_leaf_next_dirent
+{
+ grub_uint8_t next;
+ grub_uint8_t len;
+ grub_uint16_t namepart[15];
+} __attribute__ ((packed));
+
+struct grub_jfs_inode
+{
+ grub_uint32_t stamp;
+ grub_uint32_t fileset;
+ grub_uint32_t inode;
+ grub_uint8_t unused[12];
+ grub_uint64_t size;
+ grub_uint8_t unused2[20];
+ grub_uint32_t mode;
+ grub_uint8_t unused3[72];
+ grub_uint8_t unused4[96];
+
+ union
+ {
+ /* The tree describing the extents of the file. */
+ struct __attribute__ ((packed))
+ {
+ struct grub_jfs_treehead tree;
+ struct grub_jfs_tree_extent extents[16];
+ } file;
+ union
+ {
+ /* The tree describing the dirents. */
+ struct
+ {
+ grub_uint8_t unused[16];
+ grub_uint8_t flags;
+
+ /* Amount of dirents in this node. */
+ grub_uint8_t count;
+ grub_uint8_t freecnt;
+ grub_uint8_t freelist;
+ grub_uint32_t idotdot;
+ grub_uint8_t sorted[8];
+ } header;
+ struct grub_jfs_leaf_dirent dirents[8];
+ } dir __attribute__ ((packed));
+ /* Fast symlink. */
+ struct
+ {
+ grub_uint8_t unused[32];
+ grub_uint8_t path[128];
+ } symlink;
+ } __attribute__ ((packed));
+} __attribute__ ((packed));
+
+struct grub_jfs_data
+{
+ struct grub_jfs_sblock sblock;
+ grub_disk_t disk;
+ struct grub_jfs_inode fileset;
+ struct grub_jfs_inode currinode;
+ int pos;
+ int linknest;
+} __attribute__ ((packed));
+
+struct grub_jfs_diropen
+{
+ int index;
+ union
+ {
+ struct grub_jfs_tree_dir header;
+ struct grub_jfs_leaf_dirent dirent[0];
+ struct grub_jfs_leaf_next_dirent next_dirent[0];
+ grub_uint8_t sorted[0];
+ } *dirpage __attribute__ ((packed));
+ struct grub_jfs_data *data;
+ struct grub_jfs_inode *inode;
+ int count;
+ grub_uint8_t *sorted;
+ struct grub_jfs_leaf_dirent *leaf;
+ struct grub_jfs_leaf_next_dirent *next_leaf;
+
+ /* The filename and inode of the last read dirent. */
+ char name[255];
+ grub_uint32_t ino;
+} __attribute__ ((packed));
+
+
+static grub_dl_t my_mod;
+
+static grub_err_t grub_jfs_lookup_symlink (struct grub_jfs_data *data, grub_uint32_t ino);
+
+/* Get the block number for the block BLK in the node INODE in the
+ mounted filesystem DATA. */
+static grub_int64_t
+grub_jfs_blkno (struct grub_jfs_data *data, struct grub_jfs_inode *inode,
+ grub_uint64_t blk)
+{
+ auto int getblk (struct grub_jfs_treehead *treehead,
+ struct grub_jfs_tree_extent *extents);
+
+ int getblk (struct grub_jfs_treehead *treehead,
+ struct grub_jfs_tree_extent *extents)
+ {
+ int found = -1;
+ int i;
+
+ for (i = 0; i < grub_le_to_cpu16 (treehead->count) - 2; i++)
+ {
+ if (treehead->flags & GRUB_JFS_TREE_LEAF)
+ {
+ /* Read the leafnode. */
+ if (grub_le_to_cpu32 (extents[i].offset2) <= blk
+ && ((grub_le_to_cpu16 (extents[i].extent.length))
+ + (extents[i].extent.length2 << 8)
+ + grub_le_to_cpu32 (extents[i].offset2)) > blk)
+ return (blk - grub_le_to_cpu32 (extents[i].offset2)
+ + grub_le_to_cpu32 (extents[i].extent.blk2));
+ }
+ else
+ if (blk >= grub_le_to_cpu32 (extents[i].offset2))
+ found = i;
+ }
+
+ if (found != -1)
+ {
+ struct
+ {
+ struct grub_jfs_treehead treehead;
+ struct grub_jfs_tree_extent extents[254];
+ } tree;
+
+ if (grub_disk_read (data->disk,
+ grub_le_to_cpu32 (extents[found].extent.blk2)
+ << (grub_le_to_cpu16 (data->sblock.log2_blksz)
+ - GRUB_DISK_SECTOR_BITS), 0,
+ sizeof (tree), (char *) &tree))
+ return -1;
+
+ return getblk (&tree.treehead, &tree.extents[0]);
+ }
+
+ return -1;
+ }
+
+ return getblk (&inode->file.tree, &inode->file.extents[0]);
+}
+
+
+static grub_err_t
+grub_jfs_read_inode (struct grub_jfs_data *data, grub_uint32_t ino,
+ struct grub_jfs_inode *inode)
+{
+ struct grub_jfs_iag iag;
+ grub_uint32_t iagnum = ino / 4096;
+ unsigned inoext = (ino % 4096) / 32;
+ unsigned inonum = (ino % 4096) % 32;
+ grub_uint64_t iagblk;
+ grub_uint64_t inoblk;
+
+ iagblk = grub_jfs_blkno (data, &data->fileset, iagnum + 1);
+ if (grub_errno)
+ return grub_errno;
+
+ /* Read in the IAG. */
+ if (grub_disk_read (data->disk,
+ iagblk << (grub_le_to_cpu16 (data->sblock.log2_blksz)
+ - GRUB_DISK_SECTOR_BITS), 0,
+ sizeof (struct grub_jfs_iag), &iag))
+ return grub_errno;
+
+ inoblk = grub_le_to_cpu32 (iag.inodes[inoext].blk2);
+ inoblk <<= (grub_le_to_cpu16 (data->sblock.log2_blksz)
+ - GRUB_DISK_SECTOR_BITS);
+ inoblk += inonum;
+
+ if (grub_disk_read (data->disk, inoblk, 0,
+ sizeof (struct grub_jfs_inode), inode))
+ return grub_errno;
+
+ return 0;
+}
+
+
+static struct grub_jfs_data *
+grub_jfs_mount (grub_disk_t disk)
+{
+ struct grub_jfs_data *data = 0;
+
+ data = grub_malloc (sizeof (struct grub_jfs_data));
+ if (!data)
+ return 0;
+
+ /* Read the superblock. */
+ if (grub_disk_read (disk, GRUB_JFS_SBLOCK, 0,
+ sizeof (struct grub_jfs_sblock), &data->sblock))
+ goto fail;
+
+ if (grub_strncmp ((char *) (data->sblock.magic), "JFS1", 4))
+ {
+ grub_error (GRUB_ERR_BAD_FS, "not a JFS filesystem");
+ goto fail;
+ }
+
+ if (grub_le_to_cpu32 (data->sblock.blksz)
+ != (1U << grub_le_to_cpu16 (data->sblock.log2_blksz)))
+ {
+ grub_error (GRUB_ERR_BAD_FS, "not a JFS filesystem");
+ goto fail;
+ }
+
+ data->disk = disk;
+ data->pos = 0;
+ data->linknest = 0;
+
+ /* Read the inode of the first fileset. */
+ if (grub_disk_read (data->disk, GRUB_JFS_FS1_INODE_BLK, 0,
+ sizeof (struct grub_jfs_inode), &data->fileset))
+ goto fail;
+
+ return data;
+
+ fail:
+ grub_free (data);
+
+ if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
+ grub_error (GRUB_ERR_BAD_FS, "not a JFS filesystem");
+
+ return 0;
+}
+
+
+static struct grub_jfs_diropen *
+grub_jfs_opendir (struct grub_jfs_data *data, struct grub_jfs_inode *inode)
+{
+ struct grub_jfs_internal_dirent *de;
+ struct grub_jfs_diropen *diro;
+ grub_disk_addr_t blk;
+
+ de = (struct grub_jfs_internal_dirent *) inode->dir.dirents;
+
+ if (!((grub_le_to_cpu32 (inode->mode)
+ & GRUB_JFS_FILETYPE_MASK) == GRUB_JFS_FILETYPE_DIR))
+ {
+ grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a directory");
+ return 0;
+ }
+
+ diro = grub_zalloc (sizeof (struct grub_jfs_diropen));
+ if (!diro)
+ return 0;
+
+ diro->data = data;
+ diro->inode = inode;
+
+ /* Check if the entire tree is contained within the inode. */
+ if (inode->file.tree.flags & GRUB_JFS_TREE_LEAF)
+ {
+ diro->leaf = inode->dir.dirents;
+ diro->next_leaf = (struct grub_jfs_leaf_next_dirent *) de;
+ diro->sorted = inode->dir.header.sorted;
+ diro->count = inode->dir.header.count;
+
+ return diro;
+ }
+
+ diro->dirpage = grub_malloc (grub_le_to_cpu32 (data->sblock.blksz));
+ if (!diro->dirpage)
+ {
+ grub_free (diro);
+ return 0;
+ }
+
+ blk = grub_le_to_cpu32 (de[inode->dir.header.sorted[0]].ex.blk2);
+ blk <<= (grub_le_to_cpu16 (data->sblock.log2_blksz) - GRUB_DISK_SECTOR_BITS);
+
+ /* Read in the nodes until we are on the leaf node level. */
+ do
+ {
+ int index;
+ if (grub_disk_read (data->disk, blk, 0,
+ grub_le_to_cpu32 (data->sblock.blksz),
+ diro->dirpage->sorted))
+ {
+ grub_free (diro->dirpage);
+ grub_free (diro);
+ return 0;
+ }
+
+ de = (struct grub_jfs_internal_dirent *) diro->dirpage->dirent;
+ index = diro->dirpage->sorted[diro->dirpage->header.sindex * 32];
+ blk = (grub_le_to_cpu32 (de[index].ex.blk2)
+ << (grub_le_to_cpu16 (data->sblock.log2_blksz)
+ - GRUB_DISK_SECTOR_BITS));
+ } while (!(diro->dirpage->header.flags & GRUB_JFS_TREE_LEAF));
+
+ diro->leaf = diro->dirpage->dirent;
+ diro->next_leaf = diro->dirpage->next_dirent;
+ diro->sorted = &diro->dirpage->sorted[diro->dirpage->header.sindex * 32];
+ diro->count = diro->dirpage->header.count;
+
+ return diro;
+}
+
+
+static void
+grub_jfs_closedir (struct grub_jfs_diropen *diro)
+{
+ if (!diro)
+ return;
+ grub_free (diro->dirpage);
+ grub_free (diro);
+}
+
+
+/* Read in the next dirent from the directory described by DIRO. */
+static grub_err_t
+grub_jfs_getent (struct grub_jfs_diropen *diro)
+{
+ int strpos = 0;
+ struct grub_jfs_leaf_dirent *leaf;
+ struct grub_jfs_leaf_next_dirent *next_leaf;
+ int len;
+ int nextent;
+ grub_uint16_t filename[255];
+
+ auto void addstr (grub_uint16_t *uname, int ulen);
+
+ /* Add the unicode string to the utf16 filename buffer. */
+ void addstr (grub_uint16_t *name, int ulen)
+ {
+ while (ulen--)
+ filename[strpos++] = *(name++);
+ }
+
+ /* The last node, read in more. */
+ if (diro->index == diro->count)
+ {
+ grub_disk_addr_t next;
+
+ /* If the inode contains the entry tree or if this was the last
+ node, there is nothing to read. */
+ if ((diro->inode->file.tree.flags & GRUB_JFS_TREE_LEAF)
+ || !grub_le_to_cpu64 (diro->dirpage->header.nextb))
+ return GRUB_ERR_OUT_OF_RANGE;
+
+ next = grub_le_to_cpu64 (diro->dirpage->header.nextb);
+ next <<= (grub_le_to_cpu16 (diro->data->sblock.log2_blksz)
+ - GRUB_DISK_SECTOR_BITS);
+
+ if (grub_disk_read (diro->data->disk, next, 0,
+ grub_le_to_cpu32 (diro->data->sblock.blksz),
+ diro->dirpage->sorted))
+ return grub_errno;
+
+ diro->leaf = diro->dirpage->dirent;
+ diro->next_leaf = diro->dirpage->next_dirent;
+ diro->sorted = &diro->dirpage->sorted[diro->dirpage->header.sindex * 32];
+ diro->count = diro->dirpage->header.count;
+ diro->index = 0;
+ }
+
+ leaf = &diro->leaf[diro->sorted[diro->index]];
+ next_leaf = &diro->next_leaf[diro->index];
+
+ len = leaf->len;
+ if (!len)
+ {
+ diro->index++;
+ return grub_jfs_getent (diro);
+ }
+
+ addstr (leaf->namepart, len < 11 ? len : 11);
+ diro->ino = grub_le_to_cpu32 (leaf->inode);
+ len -= 11;
+
+ /* Move down to the leaf level. */
+ nextent = leaf->next;
+ if (leaf->next != 255)
+ do
+ {
+ next_leaf = &diro->next_leaf[nextent];
+ addstr (next_leaf->namepart, len < 15 ? len : 15 );
+
+ len -= 15;
+ nextent = next_leaf->next;
+ } while (next_leaf->next != 255 && len > 0);
+
+ diro->index++;
+
+ /* Convert the temporary UTF16 filename to UTF8. */
+ *grub_utf16_to_utf8 ((grub_uint8_t *) (diro->name), filename, strpos) = '\0';
+
+ return 0;
+}
+
+
+/* Read LEN bytes from the file described by DATA starting with byte
+ POS. Return the amount of read bytes in READ. */
+static grub_ssize_t
+grub_jfs_read_file (struct grub_jfs_data *data,
+ void NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t sector,
+ unsigned offset, unsigned length),
+ grub_uint64_t pos, grub_size_t len, char *buf)
+{
+ grub_uint64_t i;
+ grub_uint64_t blockcnt;
+
+ blockcnt = (len + pos + grub_le_to_cpu32 (data->sblock.blksz) - 1)
+ >> grub_le_to_cpu16 (data->sblock.log2_blksz);
+
+ for (i = pos >> grub_le_to_cpu16 (data->sblock.log2_blksz); i < blockcnt; i++)
+ {
+ grub_disk_addr_t blknr;
+ grub_uint32_t blockoff = pos & (grub_le_to_cpu32 (data->sblock.blksz) - 1);
+ grub_uint32_t blockend = grub_le_to_cpu32 (data->sblock.blksz);
+
+ grub_uint64_t skipfirst = 0;
+
+ blknr = grub_jfs_blkno (data, &data->currinode, i);
+ if (grub_errno)
+ return -1;
+
+ /* Last block. */
+ if (i == blockcnt - 1)
+ {
+ blockend = (len + pos) & (grub_le_to_cpu32 (data->sblock.blksz) - 1);
+
+ if (!blockend)
+ blockend = grub_le_to_cpu32 (data->sblock.blksz);
+ }
+
+ /* First block. */
+ if (i == (pos >> grub_le_to_cpu16 (data->sblock.log2_blksz)))
+ {
+ skipfirst = blockoff;
+ blockend -= skipfirst;
+ }
+
+ data->disk->read_hook = read_hook;
+ grub_disk_read (data->disk,
+ blknr << (grub_le_to_cpu16 (data->sblock.log2_blksz)
+ - GRUB_DISK_SECTOR_BITS),
+ skipfirst, blockend, buf);
+
+ data->disk->read_hook = 0;
+ if (grub_errno)
+ return -1;
+
+ buf += grub_le_to_cpu32 (data->sblock.blksz) - skipfirst;
+ }
+
+ return len;
+}
+
+
+/* Find the file with the pathname PATH on the filesystem described by
+ DATA. */
+static grub_err_t
+grub_jfs_find_file (struct grub_jfs_data *data, const char *path)
+{
+ char fpath[grub_strlen (path)];
+ char *name = fpath;
+ char *next;
+ struct grub_jfs_diropen *diro;
+
+ grub_strncpy (fpath, path, grub_strlen (path) + 1);
+
+ if (grub_jfs_read_inode (data, GRUB_JFS_AGGR_INODE, &data->currinode))
+ return grub_errno;
+
+ /* Skip the first slashes. */
+ while (*name == '/')
+ {
+ name++;
+ if (!*name)
+ return 0;
+ }
+
+ /* Extract the actual part from the pathname. */
+ next = grub_strchr (name, '/');
+ if (next)
+ {
+ while (*next == '/')
+ {
+ next[0] = '\0';
+ next++;
+ }
+ }
+ diro = grub_jfs_opendir (data, &data->currinode);
+ if (!diro)
+ return grub_errno;
+
+ for (;;)
+ {
+ if (grub_strlen (name) == 0)
+ return GRUB_ERR_NONE;
+
+ if (grub_jfs_getent (diro) == GRUB_ERR_OUT_OF_RANGE)
+ break;
+
+ /* Check if the current direntry matches the current part of the
+ pathname. */
+ if (!grub_strcmp (name, diro->name))
+ {
+ grub_uint32_t ino = diro->ino;
+ grub_uint32_t dirino = grub_le_to_cpu32 (data->currinode.inode);
+
+ grub_jfs_closedir (diro);
+ diro = 0;
+
+ if (grub_jfs_read_inode (data, ino, &data->currinode))
+ break;
+
+ /* Check if this is a symlink. */
+ if ((grub_le_to_cpu32 (data->currinode.mode)
+ & GRUB_JFS_FILETYPE_MASK) == GRUB_JFS_FILETYPE_LNK)
+ {
+ grub_jfs_lookup_symlink (data, dirino);
+ if (grub_errno)
+ return grub_errno;
+ }
+
+ if (!next)
+ return 0;
+
+ name = next;
+ next = grub_strchr (name, '/');
+ if (next)
+ {
+ next[0] = '\0';
+ next++;
+ }
+
+ /* Open this directory for reading dirents. */
+ diro = grub_jfs_opendir (data, &data->currinode);
+ if (!diro)
+ return grub_errno;
+
+ continue;
+ }
+ }
+
+ grub_jfs_closedir (diro);
+ grub_error (GRUB_ERR_FILE_NOT_FOUND, "file not found");
+ return grub_errno;
+}
+
+
+static grub_err_t
+grub_jfs_lookup_symlink (struct grub_jfs_data *data, grub_uint32_t ino)
+{
+ grub_uint64_t size = grub_le_to_cpu64 (data->currinode.size);
+ char symlink[size + 1];
+
+ if (++data->linknest > GRUB_JFS_MAX_SYMLNK_CNT)
+ return grub_error (GRUB_ERR_SYMLINK_LOOP, "too deep nesting of symlinks");
+
+ if (size <= 128)
+ grub_strncpy (symlink, (char *) (data->currinode.symlink.path), 128);
+ else if (grub_jfs_read_file (data, 0, 0, size, symlink) < 0)
+ return grub_errno;
+
+ symlink[size] = '\0';
+
+ /* The symlink is an absolute path, go back to the root inode. */
+ if (symlink[0] == '/')
+ ino = 2;
+
+ /* Now load in the old inode. */
+ if (grub_jfs_read_inode (data, ino, &data->currinode))
+ return grub_errno;
+
+ grub_jfs_find_file (data, symlink);
+ if (grub_errno)
+ grub_error (grub_errno, "cannot follow symlink `%s'", symlink);
+
+ return grub_errno;
+}
+
+
+static grub_err_t
+grub_jfs_dir (grub_device_t device, const char *path,
+ int (*hook) (const char *filename,
+ const struct grub_dirhook_info *info))
+{
+ struct grub_jfs_data *data = 0;
+ struct grub_jfs_diropen *diro = 0;
+
+ grub_dl_ref (my_mod);
+
+ data = grub_jfs_mount (device->disk);
+ if (!data)
+ goto fail;
+
+ if (grub_jfs_find_file (data, path))
+ goto fail;
+
+ diro = grub_jfs_opendir (data, &data->currinode);
+ if (!diro)
+ goto fail;
+
+ /* Iterate over the dirents in the directory that was found. */
+ while (grub_jfs_getent (diro) != GRUB_ERR_OUT_OF_RANGE)
+ {
+ struct grub_jfs_inode inode;
+ struct grub_dirhook_info info;
+ grub_memset (&info, 0, sizeof (info));
+
+ if (grub_jfs_read_inode (data, diro->ino, &inode))
+ goto fail;
+
+ info.dir = (grub_le_to_cpu32 (inode.mode)
+ & GRUB_JFS_FILETYPE_MASK) == GRUB_JFS_FILETYPE_DIR;
+ if (hook (diro->name, &info))
+ goto fail;
+ }
+
+ /* XXX: GRUB_ERR_OUT_OF_RANGE is used for the last dirent. */
+ if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
+ grub_errno = 0;
+
+ fail:
+ grub_jfs_closedir (diro);
+ grub_free (data);
+
+ grub_dl_unref (my_mod);
+
+ return grub_errno;
+}
+
+
+/* Open a file named NAME and initialize FILE. */
+static grub_err_t
+grub_jfs_open (struct grub_file *file, const char *name)
+{
+ struct grub_jfs_data *data;
+
+ grub_dl_ref (my_mod);
+
+ data = grub_jfs_mount (file->device->disk);
+ if (!data)
+ goto fail;
+
+ grub_jfs_find_file (data, name);
+ if (grub_errno)
+ goto fail;
+
+ /* It is only possible for open regular files. */
+ if (! ((grub_le_to_cpu32 (data->currinode.mode)
+ & GRUB_JFS_FILETYPE_MASK) == GRUB_JFS_FILETYPE_REG))
+ {
+ grub_error (GRUB_ERR_BAD_FILE_TYPE, "not a regular file");
+ goto fail;
+ }
+
+ file->data = data;
+ file->size = grub_le_to_cpu64 (data->currinode.size);
+
+ return 0;
+
+ fail:
+
+ grub_dl_unref (my_mod);
+
+ grub_free (data);
+
+ return grub_errno;
+}
+
+
+static grub_ssize_t
+grub_jfs_read (grub_file_t file, char *buf, grub_size_t len)
+{
+ struct grub_jfs_data *data =
+ (struct grub_jfs_data *) file->data;
+
+ return grub_jfs_read_file (data, file->read_hook, file->offset, len, buf);
+}
+
+
+static grub_err_t
+grub_jfs_close (grub_file_t file)
+{
+ grub_free (file->data);
+
+ grub_dl_unref (my_mod);
+
+ return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_jfs_uuid (grub_device_t device, char **uuid)
+{
+ struct grub_jfs_data *data;
+ grub_disk_t disk = device->disk;
+
+ grub_dl_ref (my_mod);
+
+ data = grub_jfs_mount (disk);
+ if (data)
+ {
+ *uuid = grub_xasprintf ("%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-"
+ "%02x%02x%02x%02x%02x%02x",
+ data->sblock.uuid[0], data->sblock.uuid[1],
+ data->sblock.uuid[2], data->sblock.uuid[3],
+ data->sblock.uuid[4], data->sblock.uuid[5],
+ data->sblock.uuid[6], data->sblock.uuid[7],
+ data->sblock.uuid[8], data->sblock.uuid[9],
+ data->sblock.uuid[10], data->sblock.uuid[11],
+ data->sblock.uuid[12], data->sblock.uuid[13],
+ data->sblock.uuid[14], data->sblock.uuid[15]);
+ }
+ else
+ *uuid = NULL;
+
+ grub_dl_unref (my_mod);
+
+ grub_free (data);
+
+ return grub_errno;
+}
+
+static grub_err_t
+grub_jfs_label (grub_device_t device, char **label)
+{
+ struct grub_jfs_data *data;
+ data = grub_jfs_mount (device->disk);
+
+ if (data)
+ *label = grub_strndup ((char *) (data->sblock.volname), 11);
+ else
+ *label = 0;
+
+ return grub_errno;
+}
+
+
+static struct grub_fs grub_jfs_fs =
+ {
+ .name = "jfs",
+ .dir = grub_jfs_dir,
+ .open = grub_jfs_open,
+ .read = grub_jfs_read,
+ .close = grub_jfs_close,
+ .label = grub_jfs_label,
+ .uuid = grub_jfs_uuid,
+ .next = 0
+ };
+
+GRUB_MOD_INIT(jfs)
+{
+ grub_fs_register (&grub_jfs_fs);
+ my_mod = mod;
+}
+
+GRUB_MOD_FINI(jfs)
+{
+ grub_fs_unregister (&grub_jfs_fs);
+}