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-rw-r--r--fs/sysv/inode.c951
1 files changed, 951 insertions, 0 deletions
diff --git a/fs/sysv/inode.c b/fs/sysv/inode.c
new file mode 100644
index 000000000..0b61ae7c7
--- /dev/null
+++ b/fs/sysv/inode.c
@@ -0,0 +1,951 @@
+/*
+ * linux/fs/sysv/inode.c
+ *
+ * minix/inode.c
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ * xenix/inode.c
+ * Copyright (C) 1992 Doug Evans
+ *
+ * coh/inode.c
+ * Copyright (C) 1993 Pascal Haible, Bruno Haible
+ *
+ * sysv/inode.c
+ * Copyright (C) 1993 Paul B. Monday
+ *
+ * sysv/inode.c
+ * Copyright (C) 1993 Bruno Haible
+ *
+ * This file contains code for allocating/freeing inodes and for read/writing
+ * the superblock.
+ */
+
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/sysv_fs.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/locks.h>
+
+#include <asm/segment.h>
+
+void sysv_put_inode(struct inode *inode)
+{
+ if (inode->i_nlink)
+ return;
+ inode->i_size = 0;
+ sysv_truncate(inode);
+ sysv_free_inode(inode);
+}
+
+
+static struct super_operations sysv_sops = {
+ sysv_read_inode,
+ sysv_notify_change,
+ sysv_write_inode,
+ sysv_put_inode,
+ sysv_put_super,
+ sysv_write_super,
+ sysv_statfs,
+ NULL
+};
+
+/* The following functions try to recognize specific filesystems.
+ * We recognize:
+ * - Xenix FS by its magic number.
+ * - SystemV FS by its magic number.
+ * - Coherent FS by its funny fname/fpack field.
+ * We discriminate among SystemV4 and SystemV2 FS by the assumption that
+ * the time stamp is not < 01-01-1980.
+ */
+
+static void detected_bs512 (struct super_block *sb)
+{
+ sb->sv_block_size = 512;
+ sb->sv_block_size_1 = 512-1;
+ sb->sv_block_size_bits = 9;
+ sb->sv_block_size_ratio = 2;
+ sb->sv_block_size_ratio_bits = 1;
+ sb->sv_inodes_per_block = 512/64;
+ sb->sv_inodes_per_block_1 = 512/64-1;
+ sb->sv_inodes_per_block_bits = 9-6;
+ sb->sv_toobig_block = 10 +
+ (sb->sv_ind_per_block = 512/4) +
+ (sb->sv_ind_per_block_2 = (512/4)*(512/4)) +
+ (sb->sv_ind_per_block_3 = (512/4)*(512/4)*(512/4));
+ sb->sv_ind_per_block_1 = 512/4-1;
+ sb->sv_ind_per_block_2_1 = (512/4)*(512/4)-1;
+ sb->sv_ind_per_block_2_bits = 2 *
+ (sb->sv_ind_per_block_bits = 9-2);
+ sb->sv_ind_per_block_block_size_1 = (512/4)*512-1;
+ sb->sv_ind_per_block_block_size_bits = (9-2)+9;
+ sb->sv_ind_per_block_2_block_size_1 = (512/4)*(512/4)*512-1;
+ sb->sv_ind_per_block_2_block_size_bits = (9-2)+(9-2)+9;
+ sb->sv_ind0_size = 10 * 512;
+ sb->sv_ind1_size = (10 + (512/4))* 512;
+ sb->sv_ind2_size = (10 + (512/4) + (512/4)*(512/4)) * 512;
+}
+
+static void detected_bs1024 (struct super_block *sb)
+{
+ sb->sv_block_size = 1024;
+ sb->sv_block_size_1 = 1024-1;
+ sb->sv_block_size_bits = 10;
+ sb->sv_block_size_ratio = 1;
+ sb->sv_block_size_ratio_bits = 0;
+ sb->sv_inodes_per_block = 1024/64;
+ sb->sv_inodes_per_block_1 = 1024/64-1;
+ sb->sv_inodes_per_block_bits = 10-6;
+ sb->sv_toobig_block = 10 +
+ (sb->sv_ind_per_block = 1024/4) +
+ (sb->sv_ind_per_block_2 = (1024/4)*(1024/4)) +
+ (sb->sv_ind_per_block_3 = (1024/4)*(1024/4)*(1024/4));
+ sb->sv_ind_per_block_1 = 1024/4-1;
+ sb->sv_ind_per_block_2_1 = (1024/4)*(1024/4)-1;
+ sb->sv_ind_per_block_2_bits = 2 *
+ (sb->sv_ind_per_block_bits = 10-2);
+ sb->sv_ind_per_block_block_size_1 = (1024/4)*1024-1;
+ sb->sv_ind_per_block_block_size_bits = (10-2)+10;
+ sb->sv_ind_per_block_2_block_size_1 = (1024/4)*(1024/4)*1024-1;
+ sb->sv_ind_per_block_2_block_size_bits = (10-2)+(10-2)+10;
+ sb->sv_ind0_size = 10 * 1024;
+ sb->sv_ind1_size = (10 + (1024/4))* 1024;
+ sb->sv_ind2_size = (10 + (1024/4) + (1024/4)*(1024/4)) * 1024;
+}
+
+static const char* detect_xenix (struct super_block *sb, struct buffer_head *bh)
+{
+ struct xenix_super_block * sbd;
+
+ sbd = (struct xenix_super_block *) bh->b_data;
+ if (sbd->s_magic != 0x2b5544)
+ return NULL;
+ switch (sbd->s_type) {
+ case 1: detected_bs512(sb); break;
+ case 2: detected_bs1024(sb); break;
+ default: return NULL;
+ }
+ sb->sv_type = FSTYPE_XENIX;
+ return "Xenix";
+}
+static struct super_block * detected_xenix (struct super_block *sb, struct buffer_head *bh1, struct buffer_head *bh2)
+{
+ struct xenix_super_block * sbd1;
+ struct xenix_super_block * sbd2;
+
+ if (sb->sv_block_size == BLOCK_SIZE)
+ /* block size = 1024, so bh1 = bh2 */
+ sbd1 = sbd2 = (struct xenix_super_block *) bh1->b_data;
+ else {
+ /* block size = 512, so bh1 != bh2 */
+ sbd1 = (struct xenix_super_block *) bh1->b_data;
+ sbd2 = (struct xenix_super_block *) (bh2->b_data - BLOCK_SIZE/2);
+ /* sanity check */
+ if (sbd2->s_magic != 0x2b5544)
+ return NULL;
+ }
+
+ sb->sv_convert = 0;
+ sb->sv_kludge_symlinks = 1;
+ sb->sv_truncate = 1;
+ sb->sv_link_max = XENIX_LINK_MAX;
+ sb->sv_fic_size = XENIX_NICINOD;
+ sb->sv_flc_size = XENIX_NICFREE;
+ sb->sv_bh1 = bh1;
+ sb->sv_bh2 = bh2;
+ sb->sv_sbd1 = (char *) sbd1;
+ sb->sv_sbd2 = (char *) sbd2;
+ sb->sv_sb_fic_count = &sbd1->s_ninode;
+ sb->sv_sb_fic_inodes = &sbd1->s_inode[0];
+ sb->sv_sb_total_free_inodes = &sbd2->s_tinode;
+ sb->sv_sb_flc_count = &sbd1->s_nfree;
+ sb->sv_sb_flc_blocks = &sbd1->s_free[0];
+ sb->sv_sb_total_free_blocks = &sbd2->s_tfree;
+ sb->sv_sb_time = &sbd2->s_time;
+ sb->sv_block_base = 0;
+ sb->sv_firstinodezone = 2;
+ sb->sv_firstdatazone = sbd1->s_isize;
+ sb->sv_nzones = sbd1->s_fsize;
+ sb->sv_ndatazones = sb->sv_nzones - sb->sv_firstdatazone;
+ return sb;
+}
+
+static const char* detect_sysv4 (struct super_block *sb, struct buffer_head *bh)
+{
+ struct sysv4_super_block * sbd;
+
+ sbd = (struct sysv4_super_block *) (bh->b_data + BLOCK_SIZE/2);
+ if (sbd->s_magic != 0xfd187e20)
+ return NULL;
+ if (sbd->s_time < 315532800) /* this is likely to happen on SystemV2 FS */
+ return NULL;
+ switch (sbd->s_type) {
+ case 1: detected_bs512(sb); break;
+ case 2: detected_bs1024(sb); break;
+ default: return NULL;
+ }
+ sb->sv_type = FSTYPE_SYSV4;
+ return "SystemV";
+}
+static struct super_block * detected_sysv4 (struct super_block *sb, struct buffer_head *bh)
+{
+ struct sysv4_super_block * sbd;
+
+ if (sb->sv_block_size == BLOCK_SIZE)
+ sbd = (struct sysv4_super_block *) (bh->b_data + BLOCK_SIZE/2);
+ else {
+ sbd = (struct sysv4_super_block *) bh->b_data;
+ /* sanity check */
+ if (sbd->s_magic != 0xfd187e20)
+ return NULL;
+ if (sbd->s_time < 315532800)
+ return NULL;
+ }
+
+ sb->sv_convert = 0;
+ sb->sv_kludge_symlinks = 0; /* ?? */
+ sb->sv_truncate = 1;
+ sb->sv_link_max = SYSV_LINK_MAX;
+ sb->sv_fic_size = SYSV_NICINOD;
+ sb->sv_flc_size = SYSV_NICFREE;
+ sb->sv_bh1 = bh;
+ sb->sv_bh2 = bh;
+ sb->sv_sbd1 = (char *) sbd;
+ sb->sv_sbd2 = (char *) sbd;
+ sb->sv_sb_fic_count = &sbd->s_ninode;
+ sb->sv_sb_fic_inodes = &sbd->s_inode[0];
+ sb->sv_sb_total_free_inodes = &sbd->s_tinode;
+ sb->sv_sb_flc_count = &sbd->s_nfree;
+ sb->sv_sb_flc_blocks = &sbd->s_free[0];
+ sb->sv_sb_total_free_blocks = &sbd->s_tfree;
+ sb->sv_sb_time = &sbd->s_time;
+ sb->sv_block_base = 0;
+ sb->sv_firstinodezone = 2;
+ sb->sv_firstdatazone = sbd->s_isize;
+ sb->sv_nzones = sbd->s_fsize;
+ sb->sv_ndatazones = sb->sv_nzones - sb->sv_firstdatazone;
+ return sb;
+}
+
+static const char* detect_sysv2 (struct super_block *sb, struct buffer_head *bh)
+{
+ struct sysv2_super_block * sbd;
+
+ sbd = (struct sysv2_super_block *) (bh->b_data + BLOCK_SIZE/2);
+ if (sbd->s_magic != 0xfd187e20)
+ return NULL;
+ if (sbd->s_time < 315532800) /* this is likely to happen on SystemV4 FS */
+ return NULL;
+ switch (sbd->s_type) {
+ case 1: detected_bs512(sb); break;
+ case 2: detected_bs1024(sb); break;
+ default: return NULL;
+ }
+ sb->sv_type = FSTYPE_SYSV2;
+ return "SystemV Release 2";
+}
+static struct super_block * detected_sysv2 (struct super_block *sb, struct buffer_head *bh)
+{
+ struct sysv2_super_block * sbd;
+
+ if (sb->sv_block_size == BLOCK_SIZE)
+ sbd = (struct sysv2_super_block *) (bh->b_data + BLOCK_SIZE/2);
+ else {
+ sbd = (struct sysv2_super_block *) bh->b_data;
+ /* sanity check */
+ if (sbd->s_magic != 0xfd187e20)
+ return NULL;
+ if (sbd->s_time < 315532800)
+ return NULL;
+ }
+
+ sb->sv_convert = 0;
+ sb->sv_kludge_symlinks = 0; /* ?? */
+ sb->sv_truncate = 1;
+ sb->sv_link_max = SYSV_LINK_MAX;
+ sb->sv_fic_size = SYSV_NICINOD;
+ sb->sv_flc_size = SYSV_NICFREE;
+ sb->sv_bh1 = bh;
+ sb->sv_bh2 = bh;
+ sb->sv_sbd1 = (char *) sbd;
+ sb->sv_sbd2 = (char *) sbd;
+ sb->sv_sb_fic_count = &sbd->s_ninode;
+ sb->sv_sb_fic_inodes = &sbd->s_inode[0];
+ sb->sv_sb_total_free_inodes = &sbd->s_tinode;
+ sb->sv_sb_flc_count = &sbd->s_nfree;
+ sb->sv_sb_flc_blocks = &sbd->s_free[0];
+ sb->sv_sb_total_free_blocks = &sbd->s_tfree;
+ sb->sv_sb_time = &sbd->s_time;
+ sb->sv_block_base = 0;
+ sb->sv_firstinodezone = 2;
+ sb->sv_firstdatazone = sbd->s_isize;
+ sb->sv_nzones = sbd->s_fsize;
+ sb->sv_ndatazones = sb->sv_nzones - sb->sv_firstdatazone;
+ return sb;
+}
+
+static const char* detect_coherent (struct super_block *sb, struct buffer_head *bh)
+{
+ struct coh_super_block * sbd;
+
+ sbd = (struct coh_super_block *) (bh->b_data + BLOCK_SIZE/2);
+ if ((memcmp(sbd->s_fname,"noname",6) && memcmp(sbd->s_fname,"xxxxx ",6))
+ || (memcmp(sbd->s_fpack,"nopack",6) && memcmp(sbd->s_fpack,"xxxxx\n",6)))
+ return NULL;
+ detected_bs512(sb);
+ sb->sv_type = FSTYPE_COH;
+ return "Coherent";
+}
+static struct super_block * detected_coherent (struct super_block *sb, struct buffer_head *bh)
+{
+ struct coh_super_block * sbd;
+
+ sbd = (struct coh_super_block *) bh->b_data;
+ /* sanity check */
+ if ((memcmp(sbd->s_fname,"noname",6) && memcmp(sbd->s_fname,"xxxxx ",6))
+ || (memcmp(sbd->s_fpack,"nopack",6) && memcmp(sbd->s_fpack,"xxxxx\n",6)))
+ return NULL;
+
+ sb->sv_convert = 1;
+ sb->sv_kludge_symlinks = 1;
+ sb->sv_truncate = 1;
+ sb->sv_link_max = COH_LINK_MAX;
+ sb->sv_fic_size = COH_NICINOD;
+ sb->sv_flc_size = COH_NICFREE;
+ sb->sv_bh1 = bh;
+ sb->sv_bh2 = bh;
+ sb->sv_sbd1 = (char *) sbd;
+ sb->sv_sbd2 = (char *) sbd;
+ sb->sv_sb_fic_count = &sbd->s_ninode;
+ sb->sv_sb_fic_inodes = &sbd->s_inode[0];
+ sb->sv_sb_total_free_inodes = &sbd->s_tinode;
+ sb->sv_sb_flc_count = &sbd->s_nfree;
+ sb->sv_sb_flc_blocks = &sbd->s_free[0];
+ sb->sv_sb_total_free_blocks = &sbd->s_tfree;
+ sb->sv_sb_time = &sbd->s_time;
+ sb->sv_block_base = 0;
+ sb->sv_firstinodezone = 2;
+ sb->sv_firstdatazone = sbd->s_isize;
+ sb->sv_nzones = from_coh_ulong(sbd->s_fsize);
+ sb->sv_ndatazones = sb->sv_nzones - sb->sv_firstdatazone;
+ return sb;
+}
+
+struct super_block *sysv_read_super(struct super_block *sb,void *data,
+ int silent)
+{
+ struct buffer_head *bh;
+ const char *found;
+ int dev = sb->s_dev;
+
+ if (1024 != sizeof (struct xenix_super_block))
+ panic("Xenix FS: bad super-block size");
+ if ((512 != sizeof (struct sysv4_super_block))
+ || (512 != sizeof (struct sysv2_super_block)))
+ panic("SystemV FS: bad super-block size");
+ if (500 != sizeof (struct coh_super_block))
+ panic("Coherent FS: bad super-block size");
+ if (64 != sizeof (struct sysv_inode))
+ panic("sysv fs: bad i-node size");
+ lock_super(sb);
+ set_blocksize(dev,BLOCK_SIZE);
+
+ /* Try to read Xenix superblock */
+ if ((bh = bread(dev, 1, BLOCK_SIZE)) != NULL) {
+ if ((found = detect_xenix(sb,bh)) != NULL)
+ goto ok;
+ brelse(bh);
+ }
+ if ((bh = bread(dev, 0, BLOCK_SIZE)) != NULL) {
+ /* Try to recognize SystemV superblock */
+ if ((found = detect_sysv4(sb,bh)) != NULL)
+ goto ok;
+ if ((found = detect_sysv2(sb,bh)) != NULL)
+ goto ok;
+ /* Try to recognize Coherent superblock */
+ if ((found = detect_coherent(sb,bh)) != NULL)
+ goto ok;
+ brelse(bh);
+ }
+ /* Try to recognize SystemV superblock */
+ /* Offset by 1 track, i.e. most probably 9, 15, or 18 kilobytes. */
+ { static int offsets[] = { 9, 15, 18, };
+ int i;
+ for (i = 0; i < sizeof(offsets)/sizeof(offsets[0]); i++)
+ if ((bh = bread(dev, offsets[i], BLOCK_SIZE)) != NULL) {
+ /* Try to recognize SystemV superblock */
+ if ((found = detect_sysv4(sb,bh)) != NULL) {
+ sb->sv_block_base = offsets[i] << sb->sv_block_size_ratio_bits;
+ goto ok;
+ }
+ if ((found = detect_sysv2(sb,bh)) != NULL) {
+ sb->sv_block_base = offsets[i] << sb->sv_block_size_ratio_bits;
+ goto ok;
+ }
+ brelse(bh);
+ }
+ }
+ sb->s_dev=0;
+ unlock_super(sb);
+ if (!silent)
+ printk("VFS: unable to read Xenix/SystemV/Coherent superblock on device %d/%d\n",MAJOR(dev),MINOR(dev));
+ return NULL;
+
+ ok:
+ if (sb->sv_block_size == BLOCK_SIZE) {
+ switch (sb->sv_type) {
+ case FSTYPE_XENIX:
+ if (!detected_xenix(sb,bh,bh))
+ goto bad_superblock;
+ break;
+ case FSTYPE_SYSV4:
+ if (!detected_sysv4(sb,bh))
+ goto bad_superblock;
+ break;
+ case FSTYPE_SYSV2:
+ if (!detected_sysv2(sb,bh))
+ goto bad_superblock;
+ break;
+ default:
+ bad_superblock:
+ brelse(bh);
+ sb->s_dev = 0;
+ unlock_super(sb);
+ printk("SysV FS: cannot read superblock in 1024 byte mode\n");
+ return NULL;
+ }
+ } else {
+ /* Switch to another block size. Unfortunately, we have to
+ release the 1 KB block bh and read it in two parts again. */
+ struct buffer_head *bh1, *bh2;
+ unsigned long blocknr = bh->b_blocknr << sb->sv_block_size_ratio_bits;
+
+ brelse(bh);
+ set_blocksize(dev,sb->sv_block_size);
+ bh1 = NULL; bh2 = NULL;
+ switch (sb->sv_type) {
+ case FSTYPE_XENIX:
+ if ((bh1 = bread(dev, blocknr, sb->sv_block_size)) == NULL)
+ goto bad_superblock2;
+ if ((bh2 = bread(dev, blocknr+1, sb->sv_block_size)) == NULL)
+ goto bad_superblock2;
+ if (!detected_xenix(sb,bh1,bh2))
+ goto bad_superblock2;
+ break;
+ case FSTYPE_SYSV4:
+ if ((bh2 = bread(dev, blocknr+1, sb->sv_block_size)) == NULL)
+ goto bad_superblock2;
+ if (!detected_sysv4(sb,bh2))
+ goto bad_superblock2;
+ break;
+ case FSTYPE_SYSV2:
+ if ((bh2 = bread(dev, blocknr+1, sb->sv_block_size)) == NULL)
+ goto bad_superblock2;
+ if (!detected_sysv2(sb,bh2))
+ goto bad_superblock2;
+ break;
+ case FSTYPE_COH:
+ if ((bh2 = bread(dev, blocknr+1, sb->sv_block_size)) == NULL)
+ goto bad_superblock2;
+ if (!detected_coherent(sb,bh2))
+ goto bad_superblock2;
+ break;
+ default:
+ bad_superblock2:
+ brelse(bh1);
+ brelse(bh2);
+ set_blocksize(sb->s_dev,BLOCK_SIZE);
+ sb->s_dev = 0;
+ unlock_super(sb);
+ printk("SysV FS: cannot read superblock in 512 byte mode\n");
+ return NULL;
+ }
+ }
+ sb->sv_ninodes = (sb->sv_firstdatazone - sb->sv_firstinodezone) << sb->sv_inodes_per_block_bits;
+ if (!silent)
+ printk("VFS: Found a %s FS (block size = %d) on device %d/%d\n",found,sb->sv_block_size,MAJOR(dev),MINOR(dev));
+ sb->s_magic = SYSV_MAGIC_BASE + sb->sv_type;
+ /* The buffer code now supports block size 512 as well as 1024. */
+ sb->s_blocksize = sb->sv_block_size;
+ sb->s_blocksize_bits = sb->sv_block_size_bits;
+ /* set up enough so that it can read an inode */
+ sb->s_dev = dev;
+ sb->s_op = &sysv_sops;
+ sb->s_mounted = iget(sb,SYSV_ROOT_INO);
+ unlock_super(sb);
+ if (!sb->s_mounted) {
+ sysv_put_super(sb);
+ printk("SysV FS: get root inode failed\n");
+ return NULL;
+ }
+ sb->s_dirt = 1;
+ /* brelse(bh); resp. brelse(bh1); brelse(bh2);
+ occurs when the disk is unmounted. */
+ return sb;
+}
+
+/* This is only called on sync() and umount(), when s_dirt=1. */
+void sysv_write_super (struct super_block *sb)
+{
+ lock_super(sb);
+ if (sb->sv_bh1->b_dirt || sb->sv_bh2->b_dirt) {
+ /* If we are going to write out the super block,
+ then attach current time stamp. */
+ unsigned long time = CURRENT_TIME;
+ if (sb->sv_convert)
+ time = to_coh_ulong(time);
+ *sb->sv_sb_time = time;
+ mark_buffer_dirty(sb->sv_bh2, 1);
+ }
+ sb->s_dirt = 0;
+ unlock_super(sb);
+}
+
+void sysv_put_super(struct super_block *sb)
+{
+ /* we can assume sysv_write_super() has already been called */
+ lock_super(sb);
+ brelse(sb->sv_bh1);
+ if (sb->sv_bh1 != sb->sv_bh2) brelse(sb->sv_bh2);
+ /* switch back to default block size */
+ if (sb->s_blocksize != BLOCK_SIZE)
+ set_blocksize(sb->s_dev,BLOCK_SIZE);
+ sb->s_dev = 0;
+ unlock_super(sb);
+}
+
+void sysv_statfs(struct super_block *sb, struct statfs *buf)
+{
+ long tmp;
+
+ put_fs_long(sb->s_magic, &buf->f_type); /* type of filesystem */
+ put_fs_long(sb->sv_block_size, &buf->f_bsize); /* block size */
+ put_fs_long(sb->sv_ndatazones, &buf->f_blocks); /* total data blocks in file system */
+ tmp = sysv_count_free_blocks(sb);
+ put_fs_long(tmp, &buf->f_bfree); /* free blocks in fs */
+ put_fs_long(tmp, &buf->f_bavail); /* free blocks available to non-superuser */
+ put_fs_long(sb->sv_ninodes, &buf->f_files); /* total file nodes in file system */
+ put_fs_long(sysv_count_free_inodes(sb), &buf->f_ffree); /* free file nodes in fs */
+ put_fs_long(SYSV_NAMELEN, &buf->f_namelen);
+ /* Don't know what value to put in buf->f_fsid */ /* file system id */
+}
+
+
+/* bmap support for running executables and shared libraries. */
+
+static inline int inode_bmap(struct super_block * sb, struct inode * inode, int nr)
+{
+ int tmp = inode->u.sysv_i.i_data[nr];
+ if (!tmp)
+ return 0;
+ return tmp + sb->sv_block_base;
+}
+
+static int block_bmap(struct super_block * sb, struct buffer_head * bh, int nr, int convert)
+{
+ int tmp;
+
+ if (!bh)
+ return 0;
+ tmp = ((sysv_zone_t *) bh->b_data) [nr];
+ if (convert)
+ tmp = from_coh_ulong(tmp);
+ brelse(bh);
+ if (!tmp)
+ return 0;
+ return tmp + sb->sv_block_base;
+}
+
+int sysv_bmap(struct inode * inode,int block_nr)
+{
+ unsigned int block = block_nr;
+ struct super_block * sb = inode->i_sb;
+ int convert;
+ int i;
+ struct buffer_head * bh;
+
+ if (block < 10)
+ return inode_bmap(sb,inode,block);
+ block -= 10;
+ convert = sb->sv_convert;
+ if (block < sb->sv_ind_per_block) {
+ i = inode_bmap(sb,inode,10);
+ if (!i)
+ return 0;
+ bh = bread(inode->i_dev,i,sb->sv_block_size);
+ return block_bmap(sb, bh, block, convert);
+ }
+ block -= sb->sv_ind_per_block;
+ if (block < sb->sv_ind_per_block_2) {
+ i = inode_bmap(sb,inode,11);
+ if (!i)
+ return 0;
+ bh = bread(inode->i_dev,i,sb->sv_block_size);
+ i = block_bmap(sb, bh, block >> sb->sv_ind_per_block_bits, convert);
+ if (!i)
+ return 0;
+ bh = bread(inode->i_dev,i,sb->sv_block_size);
+ return block_bmap(sb, bh, block & sb->sv_ind_per_block_1, convert);
+ }
+ block -= sb->sv_ind_per_block_2;
+ if (block < sb->sv_ind_per_block_3) {
+ i = inode_bmap(sb,inode,12);
+ if (!i)
+ return 0;
+ bh = bread(inode->i_dev,i,sb->sv_block_size);
+ i = block_bmap(sb, bh, block >> sb->sv_ind_per_block_2_bits, convert);
+ if (!i)
+ return 0;
+ bh = bread(inode->i_dev,i,sb->sv_block_size);
+ i = block_bmap(sb, bh, (block >> sb->sv_ind_per_block_bits) & sb->sv_ind_per_block_1,convert);
+ if (!i)
+ return 0;
+ bh = bread(inode->i_dev,i,sb->sv_block_size);
+ return block_bmap(sb, bh, block & sb->sv_ind_per_block_1, convert);
+ }
+ if ((int)block<0) {
+ printk("sysv_bmap: block<0");
+ return 0;
+ }
+ printk("sysv_bmap: block>big");
+ return 0;
+}
+
+/* End of bmap support. */
+
+
+/* Access selected blocks of regular files (or directories) */
+
+static struct buffer_head * inode_getblk(struct inode * inode, int nr, int create)
+{
+ struct super_block *sb;
+ unsigned long tmp;
+ unsigned long *p;
+ struct buffer_head * result;
+
+ sb = inode->i_sb;
+ p = inode->u.sysv_i.i_data + nr;
+repeat:
+ tmp = *p;
+ if (tmp) {
+ result = sv_getblk(sb, inode->i_dev, tmp);
+ if (tmp == *p)
+ return result;
+ brelse(result);
+ goto repeat;
+ }
+ if (!create)
+ return NULL;
+ tmp = sysv_new_block(sb);
+ if (!tmp)
+ return NULL;
+ result = sv_getblk(sb, inode->i_dev, tmp);
+ if (*p) {
+ sysv_free_block(sb,tmp);
+ brelse(result);
+ goto repeat;
+ }
+ *p = tmp;
+ inode->i_ctime = CURRENT_TIME;
+ inode->i_dirt = 1;
+ return result;
+}
+
+static struct buffer_head * block_getblk(struct inode * inode,
+ struct buffer_head * bh, int nr, int create)
+{
+ struct super_block *sb;
+ unsigned long tmp, block;
+ sysv_zone_t *p;
+ struct buffer_head * result;
+
+ if (!bh)
+ return NULL;
+ if (!bh->b_uptodate) {
+ ll_rw_block(READ, 1, &bh);
+ wait_on_buffer(bh);
+ if (!bh->b_uptodate) {
+ brelse(bh);
+ return NULL;
+ }
+ }
+ sb = inode->i_sb;
+ p = nr + (sysv_zone_t *) bh->b_data;
+repeat:
+ block = tmp = *p;
+ if (sb->sv_convert)
+ block = from_coh_ulong(block);
+ if (tmp) {
+ result = sv_getblk(sb, bh->b_dev, block);
+ if (tmp == *p) {
+ brelse(bh);
+ return result;
+ }
+ brelse(result);
+ goto repeat;
+ }
+ if (!create) {
+ brelse(bh);
+ return NULL;
+ }
+ block = sysv_new_block(sb);
+ if (!block) {
+ brelse(bh);
+ return NULL;
+ }
+ result = sv_getblk(sb, bh->b_dev, block);
+ if (*p) {
+ sysv_free_block(sb,block);
+ brelse(result);
+ goto repeat;
+ }
+ *p = (sb->sv_convert ? to_coh_ulong(block) : block);
+ mark_buffer_dirty(bh, 1);
+ brelse(bh);
+ return result;
+}
+
+struct buffer_head * sysv_getblk(struct inode * inode, unsigned int block, int create)
+{
+ struct super_block * sb = inode->i_sb;
+ struct buffer_head * bh;
+
+ if (block < 10)
+ return inode_getblk(inode,block,create);
+ block -= 10;
+ if (block < sb->sv_ind_per_block) {
+ bh = inode_getblk(inode,10,create);
+ return block_getblk(inode, bh, block, create);
+ }
+ block -= sb->sv_ind_per_block;
+ if (block < sb->sv_ind_per_block_2) {
+ bh = inode_getblk(inode,11,create);
+ bh = block_getblk(inode, bh, block >> sb->sv_ind_per_block_bits, create);
+ return block_getblk(inode, bh, block & sb->sv_ind_per_block_1, create);
+ }
+ block -= sb->sv_ind_per_block_2;
+ if (block < sb->sv_ind_per_block_3) {
+ bh = inode_getblk(inode,12,create);
+ bh = block_getblk(inode, bh, block >> sb->sv_ind_per_block_2_bits, create);
+ bh = block_getblk(inode, bh, (block >> sb->sv_ind_per_block_bits) & sb->sv_ind_per_block_1, create);
+ return block_getblk(inode, bh, block & sb->sv_ind_per_block_1, create);
+ }
+ if ((int)block<0) {
+ printk("sysv_getblk: block<0");
+ return NULL;
+ }
+ printk("sysv_getblk: block>big");
+ return NULL;
+}
+
+struct buffer_head * sysv_file_bread(struct inode * inode, int block, int create)
+{
+ struct buffer_head * bh;
+
+ bh = sysv_getblk(inode,block,create);
+ if (!bh || bh->b_uptodate)
+ return bh;
+ ll_rw_block(READ, 1, &bh);
+ wait_on_buffer(bh);
+ if (bh->b_uptodate)
+ return bh;
+ brelse(bh);
+ return NULL;
+}
+
+
+static inline unsigned long read3byte (char * p)
+{
+ return (unsigned long)(*(unsigned short *)p)
+ | (unsigned long)(*(unsigned char *)(p+2)) << 16;
+}
+
+static inline void write3byte (char * p, unsigned long val)
+{
+ *(unsigned short *)p = (unsigned short) val;
+ *(unsigned char *)(p+2) = val >> 16;
+}
+
+static inline unsigned long coh_read3byte (char * p)
+{
+ return (unsigned long)(*(unsigned char *)p) << 16
+ | (unsigned long)(*(unsigned short *)(p+1));
+}
+
+static inline void coh_write3byte (char * p, unsigned long val)
+{
+ *(unsigned char *)p = val >> 16;
+ *(unsigned short *)(p+1) = (unsigned short) val;
+}
+
+void sysv_read_inode(struct inode * inode)
+{
+ struct super_block * sb = inode->i_sb;
+ struct buffer_head * bh;
+ struct sysv_inode * raw_inode;
+ unsigned int block, ino;
+ umode_t mode;
+
+ ino = inode->i_ino;
+ inode->i_op = NULL;
+ inode->i_mode = 0;
+ if (!ino || ino > sb->sv_ninodes) {
+ printk("Bad inode number on dev 0x%04x: %d is out of range\n",
+ inode->i_dev, ino);
+ return;
+ }
+ block = sb->sv_firstinodezone + ((ino-1) >> sb->sv_inodes_per_block_bits);
+ if (!(bh = sv_bread(sb,inode->i_dev,block))) {
+ printk("Major problem: unable to read inode from dev 0x%04x\n",
+ inode->i_dev);
+ return;
+ }
+ raw_inode = (struct sysv_inode *) bh->b_data + ((ino-1) & sb->sv_inodes_per_block_1);
+ mode = raw_inode->i_mode;
+ if (sb->sv_kludge_symlinks)
+ mode = from_coh_imode(mode);
+ /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */
+ inode->i_mode = mode;
+ inode->i_uid = raw_inode->i_uid;
+ inode->i_gid = raw_inode->i_gid;
+ inode->i_nlink = raw_inode->i_nlink;
+ if (sb->sv_convert) {
+ inode->i_size = from_coh_ulong(raw_inode->i_size);
+ inode->i_atime = from_coh_ulong(raw_inode->i_atime);
+ inode->i_mtime = from_coh_ulong(raw_inode->i_mtime);
+ inode->i_ctime = from_coh_ulong(raw_inode->i_ctime);
+ } else {
+ inode->i_size = raw_inode->i_size;
+ inode->i_atime = raw_inode->i_atime;
+ inode->i_mtime = raw_inode->i_mtime;
+ inode->i_ctime = raw_inode->i_ctime;
+ }
+ inode->i_blocks = inode->i_blksize = 0;
+ if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
+ inode->i_rdev = raw_inode->i_a.i_rdev;
+ else
+ if (sb->sv_convert)
+ for (block = 0; block < 10+1+1+1; block++)
+ inode->u.sysv_i.i_data[block] =
+ coh_read3byte(&raw_inode->i_a.i_addb[3*block]);
+ else
+ for (block = 0; block < 10+1+1+1; block++)
+ inode->u.sysv_i.i_data[block] =
+ read3byte(&raw_inode->i_a.i_addb[3*block]);
+ brelse(bh);
+ if (S_ISREG(inode->i_mode))
+ inode->i_op = &sysv_file_inode_operations;
+ else if (S_ISDIR(inode->i_mode))
+ inode->i_op = &sysv_dir_inode_operations;
+ else if (S_ISLNK(inode->i_mode))
+ inode->i_op = &sysv_symlink_inode_operations;
+ else if (S_ISCHR(inode->i_mode))
+ inode->i_op = &chrdev_inode_operations;
+ else if (S_ISBLK(inode->i_mode))
+ inode->i_op = &blkdev_inode_operations;
+ else if (S_ISFIFO(inode->i_mode))
+ init_fifo(inode);
+}
+
+/* To avoid inconsistencies between inodes in memory and inodes on disk. */
+extern int sysv_notify_change(struct inode *inode, struct iattr *attr)
+{
+ int error;
+
+ if ((error = inode_change_ok(inode, attr)) != 0)
+ return error;
+
+ if (attr->ia_valid & ATTR_MODE)
+ if (inode->i_sb->sv_kludge_symlinks)
+ if (attr->ia_mode == COH_KLUDGE_SYMLINK_MODE)
+ attr->ia_mode = COH_KLUDGE_NOT_SYMLINK;
+
+ inode_setattr(inode, attr);
+
+ return 0;
+}
+
+static struct buffer_head * sysv_update_inode(struct inode * inode)
+{
+ struct super_block * sb = inode->i_sb;
+ struct buffer_head * bh;
+ struct sysv_inode * raw_inode;
+ unsigned int ino, block;
+ umode_t mode;
+
+ ino = inode->i_ino;
+ if (!ino || ino > sb->sv_ninodes) {
+ printk("Bad inode number on dev 0x%04x: %d is out of range\n",
+ inode->i_dev, ino);
+ inode->i_dirt = 0;
+ return 0;
+ }
+ block = sb->sv_firstinodezone + ((ino-1) >> sb->sv_inodes_per_block_bits);
+ if (!(bh = sv_bread(sb,inode->i_dev,block))) {
+ printk("unable to read i-node block\n");
+ inode->i_dirt = 0;
+ return 0;
+ }
+ raw_inode = (struct sysv_inode *) bh->b_data + ((ino-1) & sb->sv_inodes_per_block_1);
+ mode = inode->i_mode;
+ if (sb->sv_kludge_symlinks)
+ mode = to_coh_imode(mode);
+ raw_inode->i_mode = mode;
+ raw_inode->i_uid = inode->i_uid;
+ raw_inode->i_gid = inode->i_gid;
+ raw_inode->i_nlink = inode->i_nlink;
+ if (sb->sv_convert) {
+ raw_inode->i_size = to_coh_ulong(inode->i_size);
+ raw_inode->i_atime = to_coh_ulong(inode->i_atime);
+ raw_inode->i_mtime = to_coh_ulong(inode->i_mtime);
+ raw_inode->i_ctime = to_coh_ulong(inode->i_ctime);
+ } else {
+ raw_inode->i_size = inode->i_size;
+ raw_inode->i_atime = inode->i_atime;
+ raw_inode->i_mtime = inode->i_mtime;
+ raw_inode->i_ctime = inode->i_ctime;
+ }
+ if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
+ raw_inode->i_a.i_rdev = inode->i_rdev; /* write 2 or 3 bytes ?? */
+ else
+ if (sb->sv_convert)
+ for (block = 0; block < 10+1+1+1; block++)
+ coh_write3byte(&raw_inode->i_a.i_addb[3*block],inode->u.sysv_i.i_data[block]);
+ else
+ for (block = 0; block < 10+1+1+1; block++)
+ write3byte(&raw_inode->i_a.i_addb[3*block],inode->u.sysv_i.i_data[block]);
+ inode->i_dirt=0;
+ mark_buffer_dirty(bh, 1);
+ return bh;
+}
+
+void sysv_write_inode(struct inode * inode)
+{
+ struct buffer_head *bh;
+ bh = sysv_update_inode(inode);
+ brelse(bh);
+}
+
+int sysv_sync_inode(struct inode * inode)
+{
+ int err = 0;
+ struct buffer_head *bh;
+
+ bh = sysv_update_inode(inode);
+ if (bh && bh->b_dirt) {
+ ll_rw_block(WRITE, 1, &bh);
+ wait_on_buffer(bh);
+ if (bh->b_req && !bh->b_uptodate)
+ {
+ printk ("IO error syncing sysv inode [%04x:%08lx]\n",
+ inode->i_dev, inode->i_ino);
+ err = -1;
+ }
+ }
+ else if (!bh)
+ err = -1;
+ brelse (bh);
+ return err;
+}
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 06:53:01 +0000