diff options
Diffstat (limited to 'fs/jfs/super.c')
| -rw-r--r-- | fs/jfs/super.c | 1069 |
1 files changed, 1069 insertions, 0 deletions
diff --git a/fs/jfs/super.c b/fs/jfs/super.c new file mode 100644 index 000000000..8180d83d3 --- /dev/null +++ b/fs/jfs/super.c @@ -0,0 +1,1069 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) International Business Machines Corp., 2000-2004 + * Portions Copyright (C) Christoph Hellwig, 2001-2002 + */ + +#include <linux/fs.h> +#include <linux/module.h> +#include <linux/completion.h> +#include <linux/vfs.h> +#include <linux/quotaops.h> +#include <linux/fs_context.h> +#include <linux/fs_parser.h> +#include <linux/moduleparam.h> +#include <linux/kthread.h> +#include <linux/posix_acl.h> +#include <linux/buffer_head.h> +#include <linux/exportfs.h> +#include <linux/crc32.h> +#include <linux/slab.h> +#include <linux/uaccess.h> +#include <linux/seq_file.h> +#include <linux/blkdev.h> + +#include "jfs_incore.h" +#include "jfs_filsys.h" +#include "jfs_inode.h" +#include "jfs_metapage.h" +#include "jfs_superblock.h" +#include "jfs_dmap.h" +#include "jfs_imap.h" +#include "jfs_acl.h" +#include "jfs_debug.h" +#include "jfs_xattr.h" +#include "jfs_dinode.h" + +MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); +MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); +MODULE_LICENSE("GPL"); + +static struct kmem_cache *jfs_inode_cachep; + +static const struct super_operations jfs_super_operations; +static const struct export_operations jfs_export_operations; +static struct file_system_type jfs_fs_type; + +#define MAX_COMMIT_THREADS 64 +static int commit_threads; +module_param(commit_threads, int, 0); +MODULE_PARM_DESC(commit_threads, "Number of commit threads"); + +static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; +struct task_struct *jfsIOthread; +struct task_struct *jfsSyncThread; + +#ifdef CONFIG_JFS_DEBUG +int jfsloglevel = JFS_LOGLEVEL_WARN; +module_param(jfsloglevel, int, 0644); +MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); +#endif + +static void jfs_handle_error(struct super_block *sb) +{ + struct jfs_sb_info *sbi = JFS_SBI(sb); + + if (sb_rdonly(sb)) + return; + + updateSuper(sb, FM_DIRTY); + + if (sbi->flag & JFS_ERR_PANIC) + panic("JFS (device %s): panic forced after error\n", + sb->s_id); + else if (sbi->flag & JFS_ERR_REMOUNT_RO) { + jfs_err("ERROR: (device %s): remounting filesystem as read-only", + sb->s_id); + sb->s_flags |= SB_RDONLY; + } + + /* nothing is done for continue beyond marking the superblock dirty */ +} + +void jfs_error(struct super_block *sb, const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + va_start(args, fmt); + + vaf.fmt = fmt; + vaf.va = &args; + + pr_err("ERROR: (device %s): %ps: %pV\n", + sb->s_id, __builtin_return_address(0), &vaf); + + va_end(args); + + jfs_handle_error(sb); +} + +static struct inode *jfs_alloc_inode(struct super_block *sb) +{ + struct jfs_inode_info *jfs_inode; + + jfs_inode = alloc_inode_sb(sb, jfs_inode_cachep, GFP_NOFS); + if (!jfs_inode) + return NULL; +#ifdef CONFIG_QUOTA + memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot)); +#endif + return &jfs_inode->vfs_inode; +} + +static void jfs_free_inode(struct inode *inode) +{ + kmem_cache_free(jfs_inode_cachep, JFS_IP(inode)); +} + +static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) +{ + struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); + s64 maxinodes; + struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; + + jfs_info("In jfs_statfs"); + buf->f_type = JFS_SUPER_MAGIC; + buf->f_bsize = sbi->bsize; + buf->f_blocks = sbi->bmap->db_mapsize; + buf->f_bfree = sbi->bmap->db_nfree; + buf->f_bavail = sbi->bmap->db_nfree; + /* + * If we really return the number of allocated & free inodes, some + * applications will fail because they won't see enough free inodes. + * We'll try to calculate some guess as to how many inodes we can + * really allocate + * + * buf->f_files = atomic_read(&imap->im_numinos); + * buf->f_ffree = atomic_read(&imap->im_numfree); + */ + maxinodes = min((s64) atomic_read(&imap->im_numinos) + + ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) + << L2INOSPEREXT), (s64) 0xffffffffLL); + buf->f_files = maxinodes; + buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - + atomic_read(&imap->im_numfree)); + buf->f_fsid.val[0] = crc32_le(0, (char *)&sbi->uuid, + sizeof(sbi->uuid)/2); + buf->f_fsid.val[1] = crc32_le(0, + (char *)&sbi->uuid + sizeof(sbi->uuid)/2, + sizeof(sbi->uuid)/2); + + buf->f_namelen = JFS_NAME_MAX; + return 0; +} + +#ifdef CONFIG_QUOTA +static int jfs_quota_off(struct super_block *sb, int type); +static int jfs_quota_on(struct super_block *sb, int type, int format_id, + const struct path *path); + +static void jfs_quota_off_umount(struct super_block *sb) +{ + int type; + + for (type = 0; type < MAXQUOTAS; type++) + jfs_quota_off(sb, type); +} + +static const struct quotactl_ops jfs_quotactl_ops = { + .quota_on = jfs_quota_on, + .quota_off = jfs_quota_off, + .quota_sync = dquot_quota_sync, + .get_state = dquot_get_state, + .set_info = dquot_set_dqinfo, + .get_dqblk = dquot_get_dqblk, + .set_dqblk = dquot_set_dqblk, + .get_nextdqblk = dquot_get_next_dqblk, +}; +#else +static inline void jfs_quota_off_umount(struct super_block *sb) +{ +} +#endif + +static void jfs_put_super(struct super_block *sb) +{ + struct jfs_sb_info *sbi = JFS_SBI(sb); + int rc; + + jfs_info("In jfs_put_super"); + + jfs_quota_off_umount(sb); + + rc = jfs_umount(sb); + if (rc) + jfs_err("jfs_umount failed with return code %d", rc); + + unload_nls(sbi->nls_tab); + + truncate_inode_pages(sbi->direct_inode->i_mapping, 0); + iput(sbi->direct_inode); + + kfree(sbi); +} + +enum { + Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, + Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, + Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask, + Opt_discard, Opt_nodiscard, Opt_discard_minblk +}; + +static const struct constant_table jfs_param_errors[] = { + {"continue", JFS_ERR_CONTINUE}, + {"remount-ro", JFS_ERR_REMOUNT_RO}, + {"panic", JFS_ERR_PANIC}, + {} +}; + +static const struct fs_parameter_spec jfs_param_spec[] = { + fsparam_flag_no ("integrity", Opt_integrity), + fsparam_string ("iocharset", Opt_iocharset), + fsparam_u64 ("resize", Opt_resize), + fsparam_flag ("resize", Opt_resize_nosize), + fsparam_enum ("errors", Opt_errors, jfs_param_errors), + fsparam_flag ("quota", Opt_quota), + fsparam_flag ("noquota", Opt_ignore), + fsparam_flag ("usrquota", Opt_usrquota), + fsparam_flag ("grpquota", Opt_grpquota), + fsparam_uid ("uid", Opt_uid), + fsparam_gid ("gid", Opt_gid), + fsparam_u32oct ("umask", Opt_umask), + fsparam_flag ("discard", Opt_discard), + fsparam_u32 ("discard", Opt_discard_minblk), + fsparam_flag ("nodiscard", Opt_nodiscard), + {} +}; + +struct jfs_context { + int flag; + kuid_t uid; + kgid_t gid; + uint umask; + uint minblks_trim; + void *nls_map; + bool resize; + s64 newLVSize; +}; + +static int jfs_parse_param(struct fs_context *fc, struct fs_parameter *param) +{ + struct jfs_context *ctx = fc->fs_private; + int reconfigure = (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE); + struct fs_parse_result result; + struct nls_table *nls_map; + int opt; + + opt = fs_parse(fc, jfs_param_spec, param, &result); + if (opt < 0) + return opt; + + switch (opt) { + case Opt_integrity: + if (result.negated) + ctx->flag |= JFS_NOINTEGRITY; + else + ctx->flag &= ~JFS_NOINTEGRITY; + break; + case Opt_ignore: + /* Silently ignore the quota options */ + /* Don't do anything ;-) */ + break; + case Opt_iocharset: + if (ctx->nls_map && ctx->nls_map != (void *) -1) { + unload_nls(ctx->nls_map); + ctx->nls_map = NULL; + } + if (!strcmp(param->string, "none")) + ctx->nls_map = NULL; + else { + nls_map = load_nls(param->string); + if (!nls_map) { + pr_err("JFS: charset not found\n"); + return -EINVAL; + } + ctx->nls_map = nls_map; + } + break; + case Opt_resize: + if (!reconfigure) + return -EINVAL; + ctx->resize = true; + ctx->newLVSize = result.uint_64; + break; + case Opt_resize_nosize: + if (!reconfigure) + return -EINVAL; + ctx->resize = true; + break; + case Opt_errors: + ctx->flag &= ~JFS_ERR_MASK; + ctx->flag |= result.uint_32; + break; + +#ifdef CONFIG_QUOTA + case Opt_quota: + case Opt_usrquota: + ctx->flag |= JFS_USRQUOTA; + break; + case Opt_grpquota: + ctx->flag |= JFS_GRPQUOTA; + break; +#else + case Opt_usrquota: + case Opt_grpquota: + case Opt_quota: + pr_err("JFS: quota operations not supported\n"); + break; +#endif + case Opt_uid: + ctx->uid = result.uid; + break; + + case Opt_gid: + ctx->gid = result.gid; + break; + + case Opt_umask: + if (result.uint_32 & ~0777) { + pr_err("JFS: Invalid value of umask\n"); + return -EINVAL; + } + ctx->umask = result.uint_32; + break; + + case Opt_discard: + /* if set to 1, even copying files will cause + * trimming :O + * -> user has more control over the online trimming + */ + ctx->minblks_trim = 64; + ctx->flag |= JFS_DISCARD; + break; + + case Opt_nodiscard: + ctx->flag &= ~JFS_DISCARD; + break; + + case Opt_discard_minblk: + ctx->minblks_trim = result.uint_32; + ctx->flag |= JFS_DISCARD; + break; + + default: + return -EINVAL; + } + + return 0; +} + +static int jfs_reconfigure(struct fs_context *fc) +{ + struct jfs_context *ctx = fc->fs_private; + struct super_block *sb = fc->root->d_sb; + int readonly = fc->sb_flags & SB_RDONLY; + int rc = 0; + int flag = ctx->flag; + int ret; + + sync_filesystem(sb); + + /* Transfer results of parsing to the sbi */ + JFS_SBI(sb)->flag = ctx->flag; + JFS_SBI(sb)->uid = ctx->uid; + JFS_SBI(sb)->gid = ctx->gid; + JFS_SBI(sb)->umask = ctx->umask; + JFS_SBI(sb)->minblks_trim = ctx->minblks_trim; + if (ctx->nls_map != (void *) -1) { + unload_nls(JFS_SBI(sb)->nls_tab); + JFS_SBI(sb)->nls_tab = ctx->nls_map; + } + ctx->nls_map = NULL; + + if (ctx->resize) { + if (sb_rdonly(sb)) { + pr_err("JFS: resize requires volume to be mounted read-write\n"); + return -EROFS; + } + + if (!ctx->newLVSize) { + ctx->newLVSize = sb_bdev_nr_blocks(sb); + if (ctx->newLVSize == 0) + pr_err("JFS: Cannot determine volume size\n"); + } + + rc = jfs_extendfs(sb, ctx->newLVSize, 0); + if (rc) + return rc; + } + + if (sb_rdonly(sb) && !readonly) { + /* + * Invalidate any previously read metadata. fsck may have + * changed the on-disk data since we mounted r/o + */ + truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); + + JFS_SBI(sb)->flag = flag; + ret = jfs_mount_rw(sb, 1); + + /* mark the fs r/w for quota activity */ + sb->s_flags &= ~SB_RDONLY; + + dquot_resume(sb, -1); + return ret; + } + if (!sb_rdonly(sb) && readonly) { + rc = dquot_suspend(sb, -1); + if (rc < 0) + return rc; + rc = jfs_umount_rw(sb); + JFS_SBI(sb)->flag = flag; + return rc; + } + if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) { + if (!sb_rdonly(sb)) { + rc = jfs_umount_rw(sb); + if (rc) + return rc; + + JFS_SBI(sb)->flag = flag; + ret = jfs_mount_rw(sb, 1); + return ret; + } + } + JFS_SBI(sb)->flag = flag; + + return 0; +} + +static int jfs_fill_super(struct super_block *sb, struct fs_context *fc) +{ + struct jfs_context *ctx = fc->fs_private; + int silent = fc->sb_flags & SB_SILENT; + struct jfs_sb_info *sbi; + struct inode *inode; + int rc; + int ret = -EINVAL; + + jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); + + sbi = kzalloc_obj(struct jfs_sb_info); + if (!sbi) + return -ENOMEM; + + sb->s_fs_info = sbi; + sb->s_max_links = JFS_LINK_MAX; + sb->s_time_min = 0; + sb->s_time_max = U32_MAX; + sbi->sb = sb; + + /* Transfer results of parsing to the sbi */ + sbi->flag = ctx->flag; + sbi->uid = ctx->uid; + sbi->gid = ctx->gid; + sbi->umask = ctx->umask; + if (ctx->nls_map != (void *) -1) { + unload_nls(sbi->nls_tab); + sbi->nls_tab = ctx->nls_map; + } + ctx->nls_map = NULL; + + if (sbi->flag & JFS_DISCARD) { + if (!bdev_max_discard_sectors(sb->s_bdev)) { + pr_err("JFS: discard option not supported on device\n"); + sbi->flag &= ~JFS_DISCARD; + } else { + sbi->minblks_trim = ctx->minblks_trim; + } + } + +#ifdef CONFIG_JFS_POSIX_ACL + sb->s_flags |= SB_POSIXACL; +#endif + + if (ctx->resize) { + pr_err("resize option for remount only\n"); + goto out_unload; + } + + /* + * Initialize blocksize to 4K. + */ + if (!sb_set_blocksize(sb, PSIZE)) + goto out_unload; + + /* + * Set method vectors. + */ + sb->s_op = &jfs_super_operations; + sb->s_export_op = &jfs_export_operations; + sb->s_xattr = jfs_xattr_handlers; +#ifdef CONFIG_QUOTA + sb->dq_op = &dquot_operations; + sb->s_qcop = &jfs_quotactl_ops; + sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; +#endif + + /* + * Initialize direct-mapping inode/address-space + */ + inode = new_inode(sb); + if (inode == NULL) { + ret = -ENOMEM; + goto out_unload; + } + inode->i_size = bdev_nr_bytes(sb->s_bdev); + inode->i_mapping->a_ops = &jfs_metapage_aops; + inode_fake_hash(inode); + mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); + + sbi->direct_inode = inode; + + rc = jfs_mount(sb); + if (rc) { + if (!silent) + jfs_err("jfs_mount failed w/return code = %d", rc); + goto out_mount_failed; + } + if (sb_rdonly(sb)) + sbi->log = NULL; + else { + rc = jfs_mount_rw(sb, 0); + if (rc) { + if (!silent) { + jfs_err("jfs_mount_rw failed, return code = %d", + rc); + } + goto out_no_rw; + } + } + + sb->s_magic = JFS_SUPER_MAGIC; + + if (sbi->mntflag & JFS_OS2) + set_default_d_op(sb, &jfs_ci_dentry_operations); + + inode = jfs_iget(sb, ROOT_I); + if (IS_ERR(inode)) { + ret = PTR_ERR(inode); + goto out_no_rw; + } + sb->s_root = d_make_root(inode); + if (!sb->s_root) + goto out_no_root; + + /* logical blocks are represented by 40 bits in pxd_t, etc. + * and page cache is indexed by long + */ + sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE); + sb->s_time_gran = 1; + return 0; + +out_no_root: + jfs_err("jfs_read_super: get root dentry failed"); + +out_no_rw: + rc = jfs_umount(sb); + if (rc) + jfs_err("jfs_umount failed with return code %d", rc); +out_mount_failed: + filemap_write_and_wait(sbi->direct_inode->i_mapping); + truncate_inode_pages(sbi->direct_inode->i_mapping, 0); + make_bad_inode(sbi->direct_inode); + iput(sbi->direct_inode); + sbi->direct_inode = NULL; +out_unload: + unload_nls(sbi->nls_tab); + kfree(sbi); + return ret; +} + +static int jfs_freeze(struct super_block *sb) +{ + struct jfs_sb_info *sbi = JFS_SBI(sb); + struct jfs_log *log = sbi->log; + int rc = 0; + + if (!sb_rdonly(sb)) { + txQuiesce(sb); + rc = lmLogShutdown(log); + if (rc) { + jfs_error(sb, "lmLogShutdown failed\n"); + + /* let operations fail rather than hang */ + txResume(sb); + + return rc; + } + rc = updateSuper(sb, FM_CLEAN); + if (rc) { + jfs_err("jfs_freeze: updateSuper failed"); + /* + * Don't fail here. Everything succeeded except + * marking the superblock clean, so there's really + * no harm in leaving it frozen for now. + */ + } + } + return 0; +} + +static int jfs_unfreeze(struct super_block *sb) +{ + struct jfs_sb_info *sbi = JFS_SBI(sb); + struct jfs_log *log = sbi->log; + int rc = 0; + + if (!sb_rdonly(sb)) { + rc = updateSuper(sb, FM_MOUNT); + if (rc) { + jfs_error(sb, "updateSuper failed\n"); + goto out; + } + rc = lmLogInit(log); + if (rc) + jfs_error(sb, "lmLogInit failed\n"); +out: + txResume(sb); + } + return rc; +} + +static int jfs_get_tree(struct fs_context *fc) +{ + return get_tree_bdev(fc, jfs_fill_super); +} + +static int jfs_sync_fs(struct super_block *sb, int wait) +{ + struct jfs_log *log = JFS_SBI(sb)->log; + + /* log == NULL indicates read-only mount */ + if (log) { + /* + * Write quota structures to quota file, sync_blockdev() will + * write them to disk later + */ + dquot_writeback_dquots(sb, -1); + jfs_flush_journal(log, wait); + jfs_syncpt(log, 0); + } + + return 0; +} + +static int jfs_show_options(struct seq_file *seq, struct dentry *root) +{ + struct jfs_sb_info *sbi = JFS_SBI(root->d_sb); + + if (uid_valid(sbi->uid)) + seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid)); + if (gid_valid(sbi->gid)) + seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid)); + if (sbi->umask != -1) + seq_printf(seq, ",umask=%03o", sbi->umask); + if (sbi->flag & JFS_NOINTEGRITY) + seq_puts(seq, ",nointegrity"); + if (sbi->flag & JFS_DISCARD) + seq_printf(seq, ",discard=%u", sbi->minblks_trim); + if (sbi->nls_tab) + seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); + if (sbi->flag & JFS_ERR_CONTINUE) + seq_printf(seq, ",errors=continue"); + if (sbi->flag & JFS_ERR_PANIC) + seq_printf(seq, ",errors=panic"); + +#ifdef CONFIG_QUOTA + if (sbi->flag & JFS_USRQUOTA) + seq_puts(seq, ",usrquota"); + + if (sbi->flag & JFS_GRPQUOTA) + seq_puts(seq, ",grpquota"); +#endif + + return 0; +} + +#ifdef CONFIG_QUOTA + +/* Read data from quotafile - avoid pagecache and such because we cannot afford + * acquiring the locks... As quota files are never truncated and quota code + * itself serializes the operations (and no one else should touch the files) + * we don't have to be afraid of races */ +static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data, + size_t len, loff_t off) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + sector_t blk = off >> sb->s_blocksize_bits; + int err = 0; + int offset = off & (sb->s_blocksize - 1); + int tocopy; + size_t toread; + struct buffer_head tmp_bh; + struct buffer_head *bh; + loff_t i_size = i_size_read(inode); + + if (off > i_size) + return 0; + if (off+len > i_size) + len = i_size-off; + toread = len; + while (toread > 0) { + tocopy = min_t(size_t, sb->s_blocksize - offset, toread); + + tmp_bh.b_state = 0; + tmp_bh.b_size = i_blocksize(inode); + err = jfs_get_block(inode, blk, &tmp_bh, 0); + if (err) + return err; + if (!buffer_mapped(&tmp_bh)) /* A hole? */ + memset(data, 0, tocopy); + else { + bh = sb_bread(sb, tmp_bh.b_blocknr); + if (!bh) + return -EIO; + memcpy(data, bh->b_data+offset, tocopy); + brelse(bh); + } + offset = 0; + toread -= tocopy; + data += tocopy; + blk++; + } + return len; +} + +/* Write to quotafile */ +static ssize_t jfs_quota_write(struct super_block *sb, int type, + const char *data, size_t len, loff_t off) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + sector_t blk = off >> sb->s_blocksize_bits; + int err = 0; + int offset = off & (sb->s_blocksize - 1); + int tocopy; + size_t towrite = len; + struct buffer_head tmp_bh; + struct buffer_head *bh; + + inode_lock(inode); + while (towrite > 0) { + tocopy = min_t(size_t, sb->s_blocksize - offset, towrite); + + tmp_bh.b_state = 0; + tmp_bh.b_size = i_blocksize(inode); + err = jfs_get_block(inode, blk, &tmp_bh, 1); + if (err) + goto out; + if (offset || tocopy != sb->s_blocksize) + bh = sb_bread(sb, tmp_bh.b_blocknr); + else + bh = sb_getblk(sb, tmp_bh.b_blocknr); + if (!bh) { + err = -EIO; + goto out; + } + lock_buffer(bh); + memcpy(bh->b_data+offset, data, tocopy); + flush_dcache_folio(bh->b_folio); + set_buffer_uptodate(bh); + mark_buffer_dirty(bh); + unlock_buffer(bh); + brelse(bh); + offset = 0; + towrite -= tocopy; + data += tocopy; + blk++; + } +out: + if (len == towrite) { + inode_unlock(inode); + return err; + } + if (inode->i_size < off+len-towrite) + i_size_write(inode, off+len-towrite); + inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode)); + mark_inode_dirty(inode); + inode_unlock(inode); + return len - towrite; +} + +static struct dquot __rcu **jfs_get_dquots(struct inode *inode) +{ + return JFS_IP(inode)->i_dquot; +} + +static int jfs_quota_on(struct super_block *sb, int type, int format_id, + const struct path *path) +{ + int err; + struct inode *inode; + + err = dquot_quota_on(sb, type, format_id, path); + if (err) + return err; + + inode = d_inode(path->dentry); + inode_lock(inode); + JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL; + inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, + S_NOATIME | S_IMMUTABLE); + inode_unlock(inode); + mark_inode_dirty(inode); + + return 0; +} + +static int jfs_quota_off(struct super_block *sb, int type) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + int err; + + if (!inode || !igrab(inode)) + goto out; + + err = dquot_quota_off(sb, type); + if (err) + goto out_put; + + inode_lock(inode); + JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL); + inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); + inode_unlock(inode); + mark_inode_dirty(inode); +out_put: + iput(inode); + return err; +out: + return dquot_quota_off(sb, type); +} +#endif + +static const struct super_operations jfs_super_operations = { + .alloc_inode = jfs_alloc_inode, + .free_inode = jfs_free_inode, + .dirty_inode = jfs_dirty_inode, + .write_inode = jfs_write_inode, + .evict_inode = jfs_evict_inode, + .put_super = jfs_put_super, + .sync_fs = jfs_sync_fs, + .freeze_fs = jfs_freeze, + .unfreeze_fs = jfs_unfreeze, + .statfs = jfs_statfs, + .show_options = jfs_show_options, +#ifdef CONFIG_QUOTA + .quota_read = jfs_quota_read, + .quota_write = jfs_quota_write, + .get_dquots = jfs_get_dquots, +#endif +}; + +static const struct export_operations jfs_export_operations = { + .encode_fh = generic_encode_ino32_fh, + .fh_to_dentry = jfs_fh_to_dentry, + .fh_to_parent = jfs_fh_to_parent, + .get_parent = jfs_get_parent, +}; + +static void jfs_init_options(struct fs_context *fc, struct jfs_context *ctx) +{ + if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { + struct super_block *sb = fc->root->d_sb; + + /* Copy over current option values and mount flags */ + ctx->uid = JFS_SBI(sb)->uid; + ctx->gid = JFS_SBI(sb)->gid; + ctx->umask = JFS_SBI(sb)->umask; + ctx->nls_map = (void *)-1; + ctx->minblks_trim = JFS_SBI(sb)->minblks_trim; + ctx->flag = JFS_SBI(sb)->flag; + + } else { + /* + * Initialize the mount flag and determine the default + * error handler + */ + ctx->flag = JFS_ERR_REMOUNT_RO; + ctx->uid = INVALID_UID; + ctx->gid = INVALID_GID; + ctx->umask = -1; + ctx->nls_map = (void *)-1; + } +} + +static void jfs_free_fc(struct fs_context *fc) +{ + struct jfs_context *ctx = fc->fs_private; + + if (ctx->nls_map != (void *) -1) + unload_nls(ctx->nls_map); + kfree(ctx); +} + +static const struct fs_context_operations jfs_context_ops = { + .parse_param = jfs_parse_param, + .get_tree = jfs_get_tree, + .reconfigure = jfs_reconfigure, + .free = jfs_free_fc, +}; + +static int jfs_init_fs_context(struct fs_context *fc) +{ + struct jfs_context *ctx; + + ctx = kzalloc_obj(*ctx); + if (!ctx) + return -ENOMEM; + + jfs_init_options(fc, ctx); + + fc->fs_private = ctx; + fc->ops = &jfs_context_ops; + + return 0; +} + +static struct file_system_type jfs_fs_type = { + .owner = THIS_MODULE, + .name = "jfs", + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, + .init_fs_context = jfs_init_fs_context, + .parameters = jfs_param_spec, +}; +MODULE_ALIAS_FS("jfs"); + +static void init_once(void *foo) +{ + struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; + + memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); + INIT_LIST_HEAD(&jfs_ip->anon_inode_list); + init_rwsem(&jfs_ip->rdwrlock); + mutex_init(&jfs_ip->commit_mutex); + init_rwsem(&jfs_ip->xattr_sem); + spin_lock_init(&jfs_ip->ag_lock); + jfs_ip->active_ag = -1; + inode_init_once(&jfs_ip->vfs_inode); +} + +static int __init init_jfs_fs(void) +{ + int i; + int rc; + + jfs_inode_cachep = + kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info), + 0, SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, + offsetof(struct jfs_inode_info, i_inline_all), + sizeof_field(struct jfs_inode_info, i_inline_all), + init_once); + if (jfs_inode_cachep == NULL) + return -ENOMEM; + + /* + * Metapage initialization + */ + rc = metapage_init(); + if (rc) { + jfs_err("metapage_init failed w/rc = %d", rc); + goto free_slab; + } + + /* + * Transaction Manager initialization + */ + rc = txInit(); + if (rc) { + jfs_err("txInit failed w/rc = %d", rc); + goto free_metapage; + } + + /* + * I/O completion thread (endio) + */ + jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); + if (IS_ERR(jfsIOthread)) { + rc = PTR_ERR(jfsIOthread); + jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); + goto end_txmngr; + } + + if (commit_threads < 1) + commit_threads = num_online_cpus(); + if (commit_threads > MAX_COMMIT_THREADS) + commit_threads = MAX_COMMIT_THREADS; + + for (i = 0; i < commit_threads; i++) { + jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, + "jfsCommit"); + if (IS_ERR(jfsCommitThread[i])) { + rc = PTR_ERR(jfsCommitThread[i]); + jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); + commit_threads = i; + goto kill_committask; + } + } + + jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); + if (IS_ERR(jfsSyncThread)) { + rc = PTR_ERR(jfsSyncThread); + jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); + goto kill_committask; + } + +#ifdef PROC_FS_JFS + jfs_proc_init(); +#endif + + rc = register_filesystem(&jfs_fs_type); + if (!rc) + return 0; + +#ifdef PROC_FS_JFS + jfs_proc_clean(); +#endif + kthread_stop(jfsSyncThread); +kill_committask: + for (i = 0; i < commit_threads; i++) + kthread_stop(jfsCommitThread[i]); + kthread_stop(jfsIOthread); +end_txmngr: + txExit(); +free_metapage: + metapage_exit(); +free_slab: + kmem_cache_destroy(jfs_inode_cachep); + return rc; +} + +static void __exit exit_jfs_fs(void) +{ + int i; + + jfs_info("exit_jfs_fs called"); + + txExit(); + metapage_exit(); + + kthread_stop(jfsIOthread); + for (i = 0; i < commit_threads; i++) + kthread_stop(jfsCommitThread[i]); + kthread_stop(jfsSyncThread); +#ifdef PROC_FS_JFS + jfs_proc_clean(); +#endif + unregister_filesystem(&jfs_fs_type); + + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); + kmem_cache_destroy(jfs_inode_cachep); +} + +module_init(init_jfs_fs) +module_exit(exit_jfs_fs) |