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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/sysv/inode.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/sysv/inode.c')
-rw-r--r-- | fs/sysv/inode.c | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/fs/sysv/inode.c b/fs/sysv/inode.c new file mode 100644 index 0000000..0530077 --- /dev/null +++ b/fs/sysv/inode.c @@ -0,0 +1,354 @@ +/* + * 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 + * Copyright (C) 1997, 1998 Krzysztof G. Baranowski + * + * This file contains code for allocating/freeing inodes and for read/writing + * the superblock. + */ + +#include <linux/smp_lock.h> +#include <linux/highuid.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/buffer_head.h> +#include <linux/vfs.h> +#include <asm/byteorder.h> +#include "sysv.h" + +/* This is only called on sync() and umount(), when s_dirt=1. */ +static void sysv_write_super(struct super_block *sb) +{ + struct sysv_sb_info *sbi = SYSV_SB(sb); + unsigned long time = get_seconds(), old_time; + + lock_kernel(); + if (sb->s_flags & MS_RDONLY) + goto clean; + + /* + * If we are going to write out the super block, + * then attach current time stamp. + * But if the filesystem was marked clean, keep it clean. + */ + old_time = fs32_to_cpu(sbi, *sbi->s_sb_time); + if (sbi->s_type == FSTYPE_SYSV4) { + if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time)) + *sbi->s_sb_state = cpu_to_fs32(sbi, 0x7c269d38 - time); + *sbi->s_sb_time = cpu_to_fs32(sbi, time); + mark_buffer_dirty(sbi->s_bh2); + } +clean: + sb->s_dirt = 0; + unlock_kernel(); +} + +static int sysv_remount(struct super_block *sb, int *flags, char *data) +{ + struct sysv_sb_info *sbi = SYSV_SB(sb); + if (sbi->s_forced_ro) + *flags |= MS_RDONLY; + if (!(*flags & MS_RDONLY)) + sb->s_dirt = 1; + return 0; +} + +static void sysv_put_super(struct super_block *sb) +{ + struct sysv_sb_info *sbi = SYSV_SB(sb); + + if (!(sb->s_flags & MS_RDONLY)) { + /* XXX ext2 also updates the state here */ + mark_buffer_dirty(sbi->s_bh1); + if (sbi->s_bh1 != sbi->s_bh2) + mark_buffer_dirty(sbi->s_bh2); + } + + brelse(sbi->s_bh1); + if (sbi->s_bh1 != sbi->s_bh2) + brelse(sbi->s_bh2); + + kfree(sbi); +} + +static int sysv_statfs(struct super_block *sb, struct kstatfs *buf) +{ + struct sysv_sb_info *sbi = SYSV_SB(sb); + + buf->f_type = sb->s_magic; + buf->f_bsize = sb->s_blocksize; + buf->f_blocks = sbi->s_ndatazones; + buf->f_bavail = buf->f_bfree = sysv_count_free_blocks(sb); + buf->f_files = sbi->s_ninodes; + buf->f_ffree = sysv_count_free_inodes(sb); + buf->f_namelen = SYSV_NAMELEN; + return 0; +} + +/* + * NXI <-> N0XI for PDP, XIN <-> XIN0 for le32, NIX <-> 0NIX for be32 + */ +static inline void read3byte(struct sysv_sb_info *sbi, + unsigned char * from, unsigned char * to) +{ + if (sbi->s_bytesex == BYTESEX_PDP) { + to[0] = from[0]; + to[1] = 0; + to[2] = from[1]; + to[3] = from[2]; + } else if (sbi->s_bytesex == BYTESEX_LE) { + to[0] = from[0]; + to[1] = from[1]; + to[2] = from[2]; + to[3] = 0; + } else { + to[0] = 0; + to[1] = from[0]; + to[2] = from[1]; + to[3] = from[2]; + } +} + +static inline void write3byte(struct sysv_sb_info *sbi, + unsigned char * from, unsigned char * to) +{ + if (sbi->s_bytesex == BYTESEX_PDP) { + to[0] = from[0]; + to[1] = from[2]; + to[2] = from[3]; + } else if (sbi->s_bytesex == BYTESEX_LE) { + to[0] = from[0]; + to[1] = from[1]; + to[2] = from[2]; + } else { + to[0] = from[1]; + to[1] = from[2]; + to[2] = from[3]; + } +} + +static struct inode_operations sysv_symlink_inode_operations = { + .readlink = generic_readlink, + .follow_link = page_follow_link_light, + .put_link = page_put_link, + .getattr = sysv_getattr, +}; + +void sysv_set_inode(struct inode *inode, dev_t rdev) +{ + if (S_ISREG(inode->i_mode)) { + inode->i_op = &sysv_file_inode_operations; + inode->i_fop = &sysv_file_operations; + inode->i_mapping->a_ops = &sysv_aops; + } else if (S_ISDIR(inode->i_mode)) { + inode->i_op = &sysv_dir_inode_operations; + inode->i_fop = &sysv_dir_operations; + inode->i_mapping->a_ops = &sysv_aops; + } else if (S_ISLNK(inode->i_mode)) { + if (inode->i_blocks) { + inode->i_op = &sysv_symlink_inode_operations; + inode->i_mapping->a_ops = &sysv_aops; + } else + inode->i_op = &sysv_fast_symlink_inode_operations; + } else + init_special_inode(inode, inode->i_mode, rdev); +} + +static void sysv_read_inode(struct inode *inode) +{ + struct super_block * sb = inode->i_sb; + struct sysv_sb_info * sbi = SYSV_SB(sb); + struct buffer_head * bh; + struct sysv_inode * raw_inode; + struct sysv_inode_info * si; + unsigned int block, ino = inode->i_ino; + + if (!ino || ino > sbi->s_ninodes) { + printk("Bad inode number on dev %s: %d is out of range\n", + inode->i_sb->s_id, ino); + goto bad_inode; + } + raw_inode = sysv_raw_inode(sb, ino, &bh); + if (!raw_inode) { + printk("Major problem: unable to read inode from dev %s\n", + inode->i_sb->s_id); + goto bad_inode; + } + /* SystemV FS: kludge permissions if ino==SYSV_ROOT_INO ?? */ + inode->i_mode = fs16_to_cpu(sbi, raw_inode->i_mode); + inode->i_uid = (uid_t)fs16_to_cpu(sbi, raw_inode->i_uid); + inode->i_gid = (gid_t)fs16_to_cpu(sbi, raw_inode->i_gid); + inode->i_nlink = fs16_to_cpu(sbi, raw_inode->i_nlink); + inode->i_size = fs32_to_cpu(sbi, raw_inode->i_size); + inode->i_atime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_atime); + inode->i_mtime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_mtime); + inode->i_ctime.tv_sec = fs32_to_cpu(sbi, raw_inode->i_ctime); + inode->i_ctime.tv_nsec = 0; + inode->i_atime.tv_nsec = 0; + inode->i_mtime.tv_nsec = 0; + inode->i_blocks = inode->i_blksize = 0; + + si = SYSV_I(inode); + for (block = 0; block < 10+1+1+1; block++) + read3byte(sbi, &raw_inode->i_data[3*block], + (u8 *)&si->i_data[block]); + brelse(bh); + si->i_dir_start_lookup = 0; + if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) + sysv_set_inode(inode, + old_decode_dev(fs32_to_cpu(sbi, si->i_data[0]))); + else + sysv_set_inode(inode, 0); + return; + +bad_inode: + make_bad_inode(inode); + return; +} + +static struct buffer_head * sysv_update_inode(struct inode * inode) +{ + struct super_block * sb = inode->i_sb; + struct sysv_sb_info * sbi = SYSV_SB(sb); + struct buffer_head * bh; + struct sysv_inode * raw_inode; + struct sysv_inode_info * si; + unsigned int ino, block; + + ino = inode->i_ino; + if (!ino || ino > sbi->s_ninodes) { + printk("Bad inode number on dev %s: %d is out of range\n", + inode->i_sb->s_id, ino); + return NULL; + } + raw_inode = sysv_raw_inode(sb, ino, &bh); + if (!raw_inode) { + printk("unable to read i-node block\n"); + return NULL; + } + + raw_inode->i_mode = cpu_to_fs16(sbi, inode->i_mode); + raw_inode->i_uid = cpu_to_fs16(sbi, fs_high2lowuid(inode->i_uid)); + raw_inode->i_gid = cpu_to_fs16(sbi, fs_high2lowgid(inode->i_gid)); + raw_inode->i_nlink = cpu_to_fs16(sbi, inode->i_nlink); + raw_inode->i_size = cpu_to_fs32(sbi, inode->i_size); + raw_inode->i_atime = cpu_to_fs32(sbi, inode->i_atime.tv_sec); + raw_inode->i_mtime = cpu_to_fs32(sbi, inode->i_mtime.tv_sec); + raw_inode->i_ctime = cpu_to_fs32(sbi, inode->i_ctime.tv_sec); + + si = SYSV_I(inode); + if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) + si->i_data[0] = cpu_to_fs32(sbi, old_encode_dev(inode->i_rdev)); + for (block = 0; block < 10+1+1+1; block++) + write3byte(sbi, (u8 *)&si->i_data[block], + &raw_inode->i_data[3*block]); + mark_buffer_dirty(bh); + return bh; +} + +int sysv_write_inode(struct inode * inode, int wait) +{ + struct buffer_head *bh; + lock_kernel(); + bh = sysv_update_inode(inode); + brelse(bh); + unlock_kernel(); + return 0; +} + +int sysv_sync_inode(struct inode * inode) +{ + int err = 0; + struct buffer_head *bh; + + bh = sysv_update_inode(inode); + if (bh && buffer_dirty(bh)) { + sync_dirty_buffer(bh); + if (buffer_req(bh) && !buffer_uptodate(bh)) { + printk ("IO error syncing sysv inode [%s:%08lx]\n", + inode->i_sb->s_id, inode->i_ino); + err = -1; + } + } + else if (!bh) + err = -1; + brelse (bh); + return err; +} + +static void sysv_delete_inode(struct inode *inode) +{ + inode->i_size = 0; + sysv_truncate(inode); + lock_kernel(); + sysv_free_inode(inode); + unlock_kernel(); +} + +static kmem_cache_t *sysv_inode_cachep; + +static struct inode *sysv_alloc_inode(struct super_block *sb) +{ + struct sysv_inode_info *si; + + si = kmem_cache_alloc(sysv_inode_cachep, SLAB_KERNEL); + if (!si) + return NULL; + return &si->vfs_inode; +} + +static void sysv_destroy_inode(struct inode *inode) +{ + kmem_cache_free(sysv_inode_cachep, SYSV_I(inode)); +} + +static void init_once(void *p, kmem_cache_t *cachep, unsigned long flags) +{ + struct sysv_inode_info *si = (struct sysv_inode_info *)p; + + if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == + SLAB_CTOR_CONSTRUCTOR) + inode_init_once(&si->vfs_inode); +} + +struct super_operations sysv_sops = { + .alloc_inode = sysv_alloc_inode, + .destroy_inode = sysv_destroy_inode, + .read_inode = sysv_read_inode, + .write_inode = sysv_write_inode, + .delete_inode = sysv_delete_inode, + .put_super = sysv_put_super, + .write_super = sysv_write_super, + .remount_fs = sysv_remount, + .statfs = sysv_statfs, +}; + +int __init sysv_init_icache(void) +{ + sysv_inode_cachep = kmem_cache_create("sysv_inode_cache", + sizeof(struct sysv_inode_info), 0, + SLAB_RECLAIM_ACCOUNT, + init_once, NULL); + if (!sysv_inode_cachep) + return -ENOMEM; + return 0; +} + +void sysv_destroy_icache(void) +{ + kmem_cache_destroy(sysv_inode_cachep); +} |