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fs/affs/super.c
14.7 KB
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/* * linux/fs/affs/inode.c * * (c) 1996 Hans-Joachim Widmaier - Rewritten * * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. * * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem. * * (C) 1991 Linus Torvalds - minix filesystem */ #include <linux/module.h> #include <linux/init.h> #include <linux/statfs.h> #include <linux/parser.h> |
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#include <linux/magic.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include "affs.h" extern struct timezone sys_tz; |
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static int affs_statfs(struct dentry *dentry, struct kstatfs *buf); |
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static int affs_remount (struct super_block *sb, int *flags, char *data); static void |
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affs_commit_super(struct super_block *sb, int wait, int clean) |
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{ struct affs_sb_info *sbi = AFFS_SB(sb); struct buffer_head *bh = sbi->s_root_bh; struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh); tail->bm_flag = cpu_to_be32(clean); secs_to_datestamp(get_seconds(), &tail->disk_change); affs_fix_checksum(sb, bh); mark_buffer_dirty(bh); |
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if (wait) sync_dirty_buffer(bh); |
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} static void |
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affs_put_super(struct super_block *sb) { struct affs_sb_info *sbi = AFFS_SB(sb); pr_debug("AFFS: put_super() "); |
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if (!(sb->s_flags & MS_RDONLY) && sb->s_dirt) affs_commit_super(sb, 1, 1); |
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|
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kfree(sbi->s_prefix); |
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affs_free_bitmap(sb); affs_brelse(sbi->s_root_bh); kfree(sbi); sb->s_fs_info = NULL; |
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} static void affs_write_super(struct super_block *sb) { |
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lock_super(sb); |
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if (!(sb->s_flags & MS_RDONLY)) |
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affs_commit_super(sb, 1, 2); |
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sb->s_dirt = 0; |
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unlock_super(sb); |
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|
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pr_debug("AFFS: write_super() at %lu, clean=2 ", get_seconds()); |
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} |
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static int affs_sync_fs(struct super_block *sb, int wait) { lock_super(sb); |
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affs_commit_super(sb, wait, 2); |
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sb->s_dirt = 0; unlock_super(sb); return 0; } |
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static struct kmem_cache * affs_inode_cachep; |
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static struct inode *affs_alloc_inode(struct super_block *sb) { |
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struct affs_inode_info *i; i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL); if (!i) |
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return NULL; |
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i->vfs_inode.i_version = 1; i->i_lc = NULL; i->i_ext_bh = NULL; i->i_pa_cnt = 0; return &i->vfs_inode; |
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} |
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static void affs_i_callback(struct rcu_head *head) |
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{ |
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struct inode *inode = container_of(head, struct inode, i_rcu); |
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kmem_cache_free(affs_inode_cachep, AFFS_I(inode)); } |
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static void affs_destroy_inode(struct inode *inode) { call_rcu(&inode->i_rcu, affs_i_callback); } |
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static void init_once(void *foo) |
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{ struct affs_inode_info *ei = (struct affs_inode_info *) foo; |
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sema_init(&ei->i_link_lock, 1); sema_init(&ei->i_ext_lock, 1); |
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inode_init_once(&ei->vfs_inode); |
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} static int init_inodecache(void) { affs_inode_cachep = kmem_cache_create("affs_inode_cache", sizeof(struct affs_inode_info), |
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0, (SLAB_RECLAIM_ACCOUNT| SLAB_MEM_SPREAD), |
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init_once); |
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if (affs_inode_cachep == NULL) return -ENOMEM; return 0; } static void destroy_inodecache(void) { |
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kmem_cache_destroy(affs_inode_cachep); |
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} |
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static const struct super_operations affs_sops = { |
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.alloc_inode = affs_alloc_inode, .destroy_inode = affs_destroy_inode, |
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.write_inode = affs_write_inode, |
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.evict_inode = affs_evict_inode, |
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.put_super = affs_put_super, .write_super = affs_write_super, |
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.sync_fs = affs_sync_fs, |
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.statfs = affs_statfs, .remount_fs = affs_remount, |
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.show_options = generic_show_options, |
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}; enum { Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect, Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, Opt_verbose, Opt_volume, Opt_ignore, Opt_err, }; |
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static const match_table_t tokens = { |
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{Opt_bs, "bs=%u"}, {Opt_mode, "mode=%o"}, {Opt_mufs, "mufs"}, {Opt_prefix, "prefix=%s"}, {Opt_protect, "protect"}, {Opt_reserved, "reserved=%u"}, {Opt_root, "root=%u"}, {Opt_setgid, "setgid=%u"}, {Opt_setuid, "setuid=%u"}, {Opt_verbose, "verbose"}, {Opt_volume, "volume=%s"}, {Opt_ignore, "grpquota"}, {Opt_ignore, "noquota"}, {Opt_ignore, "quota"}, {Opt_ignore, "usrquota"}, {Opt_err, NULL}, }; static int parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root, int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) { char *p; substring_t args[MAX_OPT_ARGS]; /* Fill in defaults */ |
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*uid = current_uid(); *gid = current_gid(); |
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*reserved = 2; *root = -1; *blocksize = -1; volume[0] = ':'; volume[1] = 0; *mount_opts = 0; if (!options) return 1; while ((p = strsep(&options, ",")) != NULL) { int token, n, option; if (!*p) continue; token = match_token(p, tokens, args); switch (token) { case Opt_bs: if (match_int(&args[0], &n)) |
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return 0; |
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if (n != 512 && n != 1024 && n != 2048 && n != 4096) { printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed) "); return 0; } *blocksize = n; break; case Opt_mode: if (match_octal(&args[0], &option)) |
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return 0; |
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*mode = option & 0777; *mount_opts |= SF_SETMODE; break; case Opt_mufs: *mount_opts |= SF_MUFS; break; case Opt_prefix: |
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*prefix = match_strdup(&args[0]); if (!*prefix) return 0; *mount_opts |= SF_PREFIX; break; case Opt_protect: *mount_opts |= SF_IMMUTABLE; break; case Opt_reserved: if (match_int(&args[0], reserved)) |
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return 0; |
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break; case Opt_root: if (match_int(&args[0], root)) |
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return 0; |
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break; case Opt_setgid: if (match_int(&args[0], &option)) |
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return 0; |
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*gid = option; *mount_opts |= SF_SETGID; break; case Opt_setuid: if (match_int(&args[0], &option)) |
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return 0; |
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*uid = option; *mount_opts |= SF_SETUID; break; case Opt_verbose: *mount_opts |= SF_VERBOSE; break; case Opt_volume: { char *vol = match_strdup(&args[0]); |
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if (!vol) return 0; |
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strlcpy(volume, vol, 32); kfree(vol); break; } case Opt_ignore: /* Silently ignore the quota options */ break; default: printk("AFFS: Unrecognized mount option \"%s\" " "or missing value ", p); return 0; } } return 1; } /* This function definitely needs to be split up. Some fine day I'll * hopefully have the guts to do so. Until then: sorry for the mess. */ static int affs_fill_super(struct super_block *sb, void *data, int silent) { struct affs_sb_info *sbi; struct buffer_head *root_bh = NULL; struct buffer_head *boot_bh; struct inode *root_inode = NULL; s32 root_block; int size, blocksize; u32 chksum; int num_bm; int i, j; s32 key; uid_t uid; gid_t gid; int reserved; unsigned long mount_flags; int tmp_flags; /* fix remount prototype... */ |
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u8 sig[4]; |
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int ret = -EINVAL; |
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|
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save_mount_options(sb, data); |
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pr_debug("AFFS: read_super(%s) ",data ? (const char *)data : "no options"); sb->s_magic = AFFS_SUPER_MAGIC; sb->s_op = &affs_sops; sb->s_flags |= MS_NODIRATIME; |
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sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL); |
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if (!sbi) return -ENOMEM; |
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|
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sb->s_fs_info = sbi; |
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mutex_init(&sbi->s_bmlock); |
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spin_lock_init(&sbi->symlink_lock); |
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if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, &blocksize,&sbi->s_prefix, sbi->s_volume, &mount_flags)) { printk(KERN_ERR "AFFS: Error parsing options "); |
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kfree(sbi->s_prefix); kfree(sbi); |
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return -EINVAL; } /* N.B. after this point s_prefix must be released */ sbi->s_flags = mount_flags; sbi->s_mode = i; sbi->s_uid = uid; sbi->s_gid = gid; sbi->s_reserved= reserved; /* Get the size of the device in 512-byte blocks. * If we later see that the partition uses bigger * blocks, we will have to change it. */ size = sb->s_bdev->bd_inode->i_size >> 9; pr_debug("AFFS: initial blocksize=%d, #blocks=%d ", 512, size); affs_set_blocksize(sb, PAGE_SIZE); /* Try to find root block. Its location depends on the block size. */ i = 512; j = 4096; if (blocksize > 0) { i = j = blocksize; size = size / (blocksize / 512); } for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) { sbi->s_root_block = root_block; if (root_block < 0) sbi->s_root_block = (reserved + size - 1) / 2; pr_debug("AFFS: setting blocksize to %d ", blocksize); affs_set_blocksize(sb, blocksize); sbi->s_partition_size = size; /* The root block location that was calculated above is not * correct if the partition size is an odd number of 512- * byte blocks, which will be rounded down to a number of * 1024-byte blocks, and if there were an even number of * reserved blocks. Ideally, all partition checkers should * report the real number of blocks of the real blocksize, * but since this just cannot be done, we have to try to * find the root block anyways. In the above case, it is one * block behind the calculated one. So we check this one, too. */ for (num_bm = 0; num_bm < 2; num_bm++) { pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, " "size=%d, reserved=%d ", sb->s_id, sbi->s_root_block + num_bm, blocksize, size, reserved); root_bh = affs_bread(sb, sbi->s_root_block + num_bm); if (!root_bh) continue; if (!affs_checksum_block(sb, root_bh) && be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { sbi->s_hashsize = blocksize / 4 - 56; sbi->s_root_block += num_bm; key = 1; goto got_root; } affs_brelse(root_bh); root_bh = NULL; } } if (!silent) printk(KERN_ERR "AFFS: No valid root block on device %s ", sb->s_id); goto out_error; /* N.B. after this point bh must be released */ got_root: root_block = sbi->s_root_block; /* Find out which kind of FS we have */ boot_bh = sb_bread(sb, 0); if (!boot_bh) { printk(KERN_ERR "AFFS: Cannot read boot block "); goto out_error; } |
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memcpy(sig, boot_bh->b_data, 4); |
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brelse(boot_bh); |
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chksum = be32_to_cpu(*(__be32 *)sig); |
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/* Dircache filesystems are compatible with non-dircache ones * when reading. As long as they aren't supported, writing is * not recommended. */ if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) { printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only ", sb->s_id); sb->s_flags |= MS_RDONLY; } switch (chksum) { case MUFS_FS: case MUFS_INTLFFS: case MUFS_DCFFS: sbi->s_flags |= SF_MUFS; /* fall thru */ case FS_INTLFFS: case FS_DCFFS: sbi->s_flags |= SF_INTL; break; case MUFS_FFS: sbi->s_flags |= SF_MUFS; break; case FS_FFS: break; case MUFS_OFS: sbi->s_flags |= SF_MUFS; /* fall thru */ case FS_OFS: sbi->s_flags |= SF_OFS; sb->s_flags |= MS_NOEXEC; break; case MUFS_DCOFS: case MUFS_INTLOFS: sbi->s_flags |= SF_MUFS; case FS_DCOFS: case FS_INTLOFS: sbi->s_flags |= SF_INTL | SF_OFS; sb->s_flags |= MS_NOEXEC; break; default: printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X ", sb->s_id, chksum); goto out_error; } if (mount_flags & SF_VERBOSE) { |
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u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d ", len > 31 ? 31 : len, |
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AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, |
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sig, sig[3] + '0', blocksize); |
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} sb->s_flags |= MS_NODEV | MS_NOSUID; sbi->s_data_blksize = sb->s_blocksize; if (sbi->s_flags & SF_OFS) sbi->s_data_blksize -= 24; /* Keep super block in cache */ sbi->s_root_bh = root_bh; /* N.B. after this point s_root_bh must be released */ tmp_flags = sb->s_flags; if (affs_init_bitmap(sb, &tmp_flags)) goto out_error; sb->s_flags = tmp_flags; /* set up enough so that it can read an inode */ |
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root_inode = affs_iget(sb, root_block); if (IS_ERR(root_inode)) { ret = PTR_ERR(root_inode); goto out_error_noinode; } |
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if (AFFS_SB(sb)->s_flags & SF_INTL) sb->s_d_op = &affs_intl_dentry_operations; else sb->s_d_op = &affs_dentry_operations; |
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sb->s_root = d_alloc_root(root_inode); if (!sb->s_root) { printk(KERN_ERR "AFFS: Get root inode failed "); goto out_error; } |
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pr_debug("AFFS: s_flags=%lX ",sb->s_flags); return 0; /* * Begin the cascaded cleanup ... */ out_error: if (root_inode) iput(root_inode); |
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out_error_noinode: |
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kfree(sbi->s_bitmap); |
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affs_brelse(root_bh); |
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kfree(sbi->s_prefix); |
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kfree(sbi); sb->s_fs_info = NULL; |
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return ret; |
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} static int affs_remount(struct super_block *sb, int *flags, char *data) { struct affs_sb_info *sbi = AFFS_SB(sb); int blocksize; uid_t uid; gid_t gid; int mode; int reserved; int root_block; unsigned long mount_flags; int res = 0; |
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char *new_opts = kstrdup(data, GFP_KERNEL); |
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char volume[32]; char *prefix = NULL; |
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pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\") ",*flags,data); *flags |= MS_NODIRATIME; |
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memcpy(volume, sbi->s_volume, 32); |
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if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block, |
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&blocksize, &prefix, volume, |
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&mount_flags)) { |
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kfree(prefix); |
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kfree(new_opts); |
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return -EINVAL; |
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} |
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replace_mount_options(sb, new_opts); |
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sbi->s_flags = mount_flags; sbi->s_mode = mode; sbi->s_uid = uid; sbi->s_gid = gid; |
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/* protect against readers */ spin_lock(&sbi->symlink_lock); if (prefix) { kfree(sbi->s_prefix); sbi->s_prefix = prefix; } memcpy(sbi->s_volume, volume, 32); spin_unlock(&sbi->symlink_lock); |
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|
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if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
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return 0; |
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|
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if (*flags & MS_RDONLY) { |
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556 |
affs_write_super(sb); |
1da177e4c Linux-2.6.12-rc2 |
557 558 559 560 561 562 563 564 |
affs_free_bitmap(sb); } else res = affs_init_bitmap(sb, flags); return res; } static int |
726c33422 [PATCH] VFS: Perm... |
565 |
affs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4c Linux-2.6.12-rc2 |
566 |
{ |
726c33422 [PATCH] VFS: Perm... |
567 |
struct super_block *sb = dentry->d_sb; |
1da177e4c Linux-2.6.12-rc2 |
568 |
int free; |
a6a2a73c4 fs/affs: return f... |
569 |
u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
1da177e4c Linux-2.6.12-rc2 |
570 571 572 573 574 575 576 577 578 579 580 |
pr_debug("AFFS: statfs() partsize=%d, reserved=%d ",AFFS_SB(sb)->s_partition_size, AFFS_SB(sb)->s_reserved); free = affs_count_free_blocks(sb); buf->f_type = AFFS_SUPER_MAGIC; buf->f_bsize = sb->s_blocksize; buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; buf->f_bfree = free; buf->f_bavail = free; |
a6a2a73c4 fs/affs: return f... |
581 582 583 |
buf->f_fsid.val[0] = (u32)id; buf->f_fsid.val[1] = (u32)(id >> 32); buf->f_namelen = 30; |
1da177e4c Linux-2.6.12-rc2 |
584 585 |
return 0; } |
152a08366 new helper: mount... |
586 587 |
static struct dentry *affs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) |
1da177e4c Linux-2.6.12-rc2 |
588 |
{ |
152a08366 new helper: mount... |
589 |
return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super); |
1da177e4c Linux-2.6.12-rc2 |
590 591 592 593 594 |
} static struct file_system_type affs_fs_type = { .owner = THIS_MODULE, .name = "affs", |
152a08366 new helper: mount... |
595 |
.mount = affs_mount, |
1da177e4c Linux-2.6.12-rc2 |
596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 |
.kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, }; static int __init init_affs_fs(void) { int err = init_inodecache(); if (err) goto out1; err = register_filesystem(&affs_fs_type); if (err) goto out; return 0; out: destroy_inodecache(); out1: return err; } static void __exit exit_affs_fs(void) { unregister_filesystem(&affs_fs_type); destroy_inodecache(); } MODULE_DESCRIPTION("Amiga filesystem support for Linux"); MODULE_LICENSE("GPL"); module_init(init_affs_fs) module_exit(exit_affs_fs) |