diff options
Diffstat (limited to 'fs/jffs2/dir.c')
| -rw-r--r-- | fs/jffs2/dir.c | 799 |
1 files changed, 799 insertions, 0 deletions
diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c new file mode 100644 index 0000000..757306f --- /dev/null +++ b/fs/jffs2/dir.c @@ -0,0 +1,799 @@ +/* + * JFFS2 -- Journalling Flash File System, Version 2. + * + * Copyright (C) 2001-2003 Red Hat, Inc. + * + * Created by David Woodhouse <dwmw2@infradead.org> + * + * For licensing information, see the file 'LICENCE' in this directory. + * + * $Id: dir.c,v 1.84 2004/11/16 20:36:11 dwmw2 Exp $ + * + */ + +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/sched.h> +#include <linux/fs.h> +#include <linux/crc32.h> +#include <linux/jffs2.h> +#include <linux/jffs2_fs_i.h> +#include <linux/jffs2_fs_sb.h> +#include <linux/time.h> +#include "nodelist.h" + +/* Urgh. Please tell me there's a nicer way of doing these. */ +#include <linux/version.h> +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,48) +typedef int mknod_arg_t; +#define NAMEI_COMPAT(x) ((void *)x) +#else +typedef dev_t mknod_arg_t; +#define NAMEI_COMPAT(x) (x) +#endif + +static int jffs2_readdir (struct file *, void *, filldir_t); + +static int jffs2_create (struct inode *,struct dentry *,int, + struct nameidata *); +static struct dentry *jffs2_lookup (struct inode *,struct dentry *, + struct nameidata *); +static int jffs2_link (struct dentry *,struct inode *,struct dentry *); +static int jffs2_unlink (struct inode *,struct dentry *); +static int jffs2_symlink (struct inode *,struct dentry *,const char *); +static int jffs2_mkdir (struct inode *,struct dentry *,int); +static int jffs2_rmdir (struct inode *,struct dentry *); +static int jffs2_mknod (struct inode *,struct dentry *,int,mknod_arg_t); +static int jffs2_rename (struct inode *, struct dentry *, + struct inode *, struct dentry *); + +struct file_operations jffs2_dir_operations = +{ + .read = generic_read_dir, + .readdir = jffs2_readdir, + .ioctl = jffs2_ioctl, + .fsync = jffs2_fsync +}; + + +struct inode_operations jffs2_dir_inode_operations = +{ + .create = NAMEI_COMPAT(jffs2_create), + .lookup = NAMEI_COMPAT(jffs2_lookup), + .link = jffs2_link, + .unlink = jffs2_unlink, + .symlink = jffs2_symlink, + .mkdir = jffs2_mkdir, + .rmdir = jffs2_rmdir, + .mknod = jffs2_mknod, + .rename = jffs2_rename, + .setattr = jffs2_setattr, +}; + +/***********************************************************************/ + + +/* We keep the dirent list sorted in increasing order of name hash, + and we use the same hash function as the dentries. Makes this + nice and simple +*/ +static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, + struct nameidata *nd) +{ + struct jffs2_inode_info *dir_f; + struct jffs2_sb_info *c; + struct jffs2_full_dirent *fd = NULL, *fd_list; + uint32_t ino = 0; + struct inode *inode = NULL; + + D1(printk(KERN_DEBUG "jffs2_lookup()\n")); + + dir_f = JFFS2_INODE_INFO(dir_i); + c = JFFS2_SB_INFO(dir_i->i_sb); + + down(&dir_f->sem); + + /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ + for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { + if (fd_list->nhash == target->d_name.hash && + (!fd || fd_list->version > fd->version) && + strlen(fd_list->name) == target->d_name.len && + !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { + fd = fd_list; + } + } + if (fd) + ino = fd->ino; + up(&dir_f->sem); + if (ino) { + inode = iget(dir_i->i_sb, ino); + if (!inode) { + printk(KERN_WARNING "iget() failed for ino #%u\n", ino); + return (ERR_PTR(-EIO)); + } + } + + d_add(target, inode); + + return NULL; +} + +/***********************************************************************/ + + +static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) +{ + struct jffs2_inode_info *f; + struct jffs2_sb_info *c; + struct inode *inode = filp->f_dentry->d_inode; + struct jffs2_full_dirent *fd; + unsigned long offset, curofs; + + D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_dentry->d_inode->i_ino)); + + f = JFFS2_INODE_INFO(inode); + c = JFFS2_SB_INFO(inode->i_sb); + + offset = filp->f_pos; + + if (offset == 0) { + D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); + if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) + goto out; + offset++; + } + if (offset == 1) { + unsigned long pino = parent_ino(filp->f_dentry); + D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); + if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) + goto out; + offset++; + } + + curofs=1; + down(&f->sem); + for (fd = f->dents; fd; fd = fd->next) { + + curofs++; + /* First loop: curofs = 2; offset = 2 */ + if (curofs < offset) { + D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", + fd->name, fd->ino, fd->type, curofs, offset)); + continue; + } + if (!fd->ino) { + D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); + offset++; + continue; + } + D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); + if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) + break; + offset++; + } + up(&f->sem); + out: + filp->f_pos = offset; + return 0; +} + +/***********************************************************************/ + + +static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, + struct nameidata *nd) +{ + struct jffs2_raw_inode *ri; + struct jffs2_inode_info *f, *dir_f; + struct jffs2_sb_info *c; + struct inode *inode; + int ret; + + ri = jffs2_alloc_raw_inode(); + if (!ri) + return -ENOMEM; + + c = JFFS2_SB_INFO(dir_i->i_sb); + + D1(printk(KERN_DEBUG "jffs2_create()\n")); + + inode = jffs2_new_inode(dir_i, mode, ri); + + if (IS_ERR(inode)) { + D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); + jffs2_free_raw_inode(ri); + return PTR_ERR(inode); + } + + inode->i_op = &jffs2_file_inode_operations; + inode->i_fop = &jffs2_file_operations; + inode->i_mapping->a_ops = &jffs2_file_address_operations; + inode->i_mapping->nrpages = 0; + + f = JFFS2_INODE_INFO(inode); + dir_f = JFFS2_INODE_INFO(dir_i); + + ret = jffs2_do_create(c, dir_f, f, ri, + dentry->d_name.name, dentry->d_name.len); + + if (ret) { + make_bad_inode(inode); + iput(inode); + jffs2_free_raw_inode(ri); + return ret; + } + + dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); + + jffs2_free_raw_inode(ri); + d_instantiate(dentry, inode); + + D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", + inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages)); + return 0; +} + +/***********************************************************************/ + + +static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) +{ + struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); + struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); + struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); + int ret; + + ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, + dentry->d_name.len, dead_f); + if (dead_f->inocache) + dentry->d_inode->i_nlink = dead_f->inocache->nlink; + return ret; +} +/***********************************************************************/ + + +static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) +{ + struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); + struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); + struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); + int ret; + uint8_t type; + + /* Don't let people make hard links to bad inodes. */ + if (!f->inocache) + return -EIO; + + if (S_ISDIR(old_dentry->d_inode->i_mode)) + return -EPERM; + + /* XXX: This is ugly */ + type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; + if (!type) type = DT_REG; + + ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len); + + if (!ret) { + down(&f->sem); + old_dentry->d_inode->i_nlink = ++f->inocache->nlink; + up(&f->sem); + d_instantiate(dentry, old_dentry->d_inode); + atomic_inc(&old_dentry->d_inode->i_count); + } + return ret; +} + +/***********************************************************************/ + +static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) +{ + struct jffs2_inode_info *f, *dir_f; + struct jffs2_sb_info *c; + struct inode *inode; + struct jffs2_raw_inode *ri; + struct jffs2_raw_dirent *rd; + struct jffs2_full_dnode *fn; + struct jffs2_full_dirent *fd; + int namelen; + uint32_t alloclen, phys_ofs; + int ret; + + /* FIXME: If you care. We'd need to use frags for the target + if it grows much more than this */ + if (strlen(target) > 254) + return -EINVAL; + + ri = jffs2_alloc_raw_inode(); + + if (!ri) + return -ENOMEM; + + c = JFFS2_SB_INFO(dir_i->i_sb); + + /* Try to reserve enough space for both node and dirent. + * Just the node will do for now, though + */ + namelen = dentry->d_name.len; + ret = jffs2_reserve_space(c, sizeof(*ri) + strlen(target), &phys_ofs, &alloclen, ALLOC_NORMAL); + + if (ret) { + jffs2_free_raw_inode(ri); + return ret; + } + + inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); + + if (IS_ERR(inode)) { + jffs2_free_raw_inode(ri); + jffs2_complete_reservation(c); + return PTR_ERR(inode); + } + + inode->i_op = &jffs2_symlink_inode_operations; + + f = JFFS2_INODE_INFO(inode); + + inode->i_size = strlen(target); + ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); + ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); + ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); + + ri->compr = JFFS2_COMPR_NONE; + ri->data_crc = cpu_to_je32(crc32(0, target, strlen(target))); + ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); + + fn = jffs2_write_dnode(c, f, ri, target, strlen(target), phys_ofs, ALLOC_NORMAL); + + jffs2_free_raw_inode(ri); + + if (IS_ERR(fn)) { + /* Eeek. Wave bye bye */ + up(&f->sem); + jffs2_complete_reservation(c); + jffs2_clear_inode(inode); + return PTR_ERR(fn); + } + /* No data here. Only a metadata node, which will be + obsoleted by the first data write + */ + f->metadata = fn; + up(&f->sem); + + jffs2_complete_reservation(c); + ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); + if (ret) { + /* Eep. */ + jffs2_clear_inode(inode); + return ret; + } + + rd = jffs2_alloc_raw_dirent(); + if (!rd) { + /* Argh. Now we treat it like a normal delete */ + jffs2_complete_reservation(c); + jffs2_clear_inode(inode); + return -ENOMEM; + } + + dir_f = JFFS2_INODE_INFO(dir_i); + down(&dir_f->sem); + + rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); + rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); + rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); + rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); + + rd->pino = cpu_to_je32(dir_i->i_ino); + rd->version = cpu_to_je32(++dir_f->highest_version); + rd->ino = cpu_to_je32(inode->i_ino); + rd->mctime = cpu_to_je32(get_seconds()); + rd->nsize = namelen; + rd->type = DT_LNK; + rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); + rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); + + fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); + + if (IS_ERR(fd)) { + /* dirent failed to write. Delete the inode normally + as if it were the final unlink() */ + jffs2_complete_reservation(c); + jffs2_free_raw_dirent(rd); + up(&dir_f->sem); + jffs2_clear_inode(inode); + return PTR_ERR(fd); + } + + dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); + + jffs2_free_raw_dirent(rd); + + /* Link the fd into the inode's list, obsoleting an old + one if necessary. */ + jffs2_add_fd_to_list(c, fd, &dir_f->dents); + + up(&dir_f->sem); + jffs2_complete_reservation(c); + + d_instantiate(dentry, inode); + return 0; +} + + +static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) +{ + struct jffs2_inode_info *f, *dir_f; + struct jffs2_sb_info *c; + struct inode *inode; + struct jffs2_raw_inode *ri; + struct jffs2_raw_dirent *rd; + struct jffs2_full_dnode *fn; + struct jffs2_full_dirent *fd; + int namelen; + uint32_t alloclen, phys_ofs; + int ret; + + mode |= S_IFDIR; + + ri = jffs2_alloc_raw_inode(); + if (!ri) + return -ENOMEM; + + c = JFFS2_SB_INFO(dir_i->i_sb); + + /* Try to reserve enough space for both node and dirent. + * Just the node will do for now, though + */ + namelen = dentry->d_name.len; + ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL); + + if (ret) { + jffs2_free_raw_inode(ri); + return ret; + } + + inode = jffs2_new_inode(dir_i, mode, ri); + + if (IS_ERR(inode)) { + jffs2_free_raw_inode(ri); + jffs2_complete_reservation(c); + return PTR_ERR(inode); + } + + inode->i_op = &jffs2_dir_inode_operations; + inode->i_fop = &jffs2_dir_operations; + /* Directories get nlink 2 at start */ + inode->i_nlink = 2; + + f = JFFS2_INODE_INFO(inode); + + ri->data_crc = cpu_to_je32(0); + ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); + + fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL); + + jffs2_free_raw_inode(ri); + + if (IS_ERR(fn)) { + /* Eeek. Wave bye bye */ + up(&f->sem); + jffs2_complete_reservation(c); + jffs2_clear_inode(inode); + return PTR_ERR(fn); + } + /* No data here. Only a metadata node, which will be + obsoleted by the first data write + */ + f->metadata = fn; + up(&f->sem); + + jffs2_complete_reservation(c); + ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); + if (ret) { + /* Eep. */ + jffs2_clear_inode(inode); + return ret; + } + + rd = jffs2_alloc_raw_dirent(); + if (!rd) { + /* Argh. Now we treat it like a normal delete */ + jffs2_complete_reservation(c); + jffs2_clear_inode(inode); + return -ENOMEM; + } + + dir_f = JFFS2_INODE_INFO(dir_i); + down(&dir_f->sem); + + rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); + rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); + rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); + rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); + + rd->pino = cpu_to_je32(dir_i->i_ino); + rd->version = cpu_to_je32(++dir_f->highest_version); + rd->ino = cpu_to_je32(inode->i_ino); + rd->mctime = cpu_to_je32(get_seconds()); + rd->nsize = namelen; + rd->type = DT_DIR; + rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); + rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); + + fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); + + if (IS_ERR(fd)) { + /* dirent failed to write. Delete the inode normally + as if it were the final unlink() */ + jffs2_complete_reservation(c); + jffs2_free_raw_dirent(rd); + up(&dir_f->sem); + jffs2_clear_inode(inode); + return PTR_ERR(fd); + } + + dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); + dir_i->i_nlink++; + + jffs2_free_raw_dirent(rd); + + /* Link the fd into the inode's list, obsoleting an old + one if necessary. */ + jffs2_add_fd_to_list(c, fd, &dir_f->dents); + + up(&dir_f->sem); + jffs2_complete_reservation(c); + + d_instantiate(dentry, inode); + return 0; +} + +static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) +{ + struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); + struct jffs2_full_dirent *fd; + int ret; + + for (fd = f->dents ; fd; fd = fd->next) { + if (fd->ino) + return -ENOTEMPTY; + } + ret = jffs2_unlink(dir_i, dentry); + if (!ret) + dir_i->i_nlink--; + return ret; +} + +static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, mknod_arg_t rdev) +{ + struct jffs2_inode_info *f, *dir_f; + struct jffs2_sb_info *c; + struct inode *inode; + struct jffs2_raw_inode *ri; + struct jffs2_raw_dirent *rd; + struct jffs2_full_dnode *fn; + struct jffs2_full_dirent *fd; + int namelen; + jint16_t dev; + int devlen = 0; + uint32_t alloclen, phys_ofs; + int ret; + + if (!old_valid_dev(rdev)) + return -EINVAL; + + ri = jffs2_alloc_raw_inode(); + if (!ri) + return -ENOMEM; + + c = JFFS2_SB_INFO(dir_i->i_sb); + + if (S_ISBLK(mode) || S_ISCHR(mode)) { + dev = cpu_to_je16(old_encode_dev(rdev)); + devlen = sizeof(dev); + } + + /* Try to reserve enough space for both node and dirent. + * Just the node will do for now, though + */ + namelen = dentry->d_name.len; + ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, ALLOC_NORMAL); + + if (ret) { + jffs2_free_raw_inode(ri); + return ret; + } + + inode = jffs2_new_inode(dir_i, mode, ri); + + if (IS_ERR(inode)) { + jffs2_free_raw_inode(ri); + jffs2_complete_reservation(c); + return PTR_ERR(inode); + } + inode->i_op = &jffs2_file_inode_operations; + init_special_inode(inode, inode->i_mode, rdev); + + f = JFFS2_INODE_INFO(inode); + + ri->dsize = ri->csize = cpu_to_je32(devlen); + ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); + ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); + + ri->compr = JFFS2_COMPR_NONE; + ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); + ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); + + fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL); + + jffs2_free_raw_inode(ri); + + if (IS_ERR(fn)) { + /* Eeek. Wave bye bye */ + up(&f->sem); + jffs2_complete_reservation(c); + jffs2_clear_inode(inode); + return PTR_ERR(fn); + } + /* No data here. Only a metadata node, which will be + obsoleted by the first data write + */ + f->metadata = fn; + up(&f->sem); + + jffs2_complete_reservation(c); + ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); + if (ret) { + /* Eep. */ + jffs2_clear_inode(inode); + return ret; + } + + rd = jffs2_alloc_raw_dirent(); + if (!rd) { + /* Argh. Now we treat it like a normal delete */ + jffs2_complete_reservation(c); + jffs2_clear_inode(inode); + return -ENOMEM; + } + + dir_f = JFFS2_INODE_INFO(dir_i); + down(&dir_f->sem); + + rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); + rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); + rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); + rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); + + rd->pino = cpu_to_je32(dir_i->i_ino); + rd->version = cpu_to_je32(++dir_f->highest_version); + rd->ino = cpu_to_je32(inode->i_ino); + rd->mctime = cpu_to_je32(get_seconds()); + rd->nsize = namelen; + + /* XXX: This is ugly. */ + rd->type = (mode & S_IFMT) >> 12; + + rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); + rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); + + fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); + + if (IS_ERR(fd)) { + /* dirent failed to write. Delete the inode normally + as if it were the final unlink() */ + jffs2_complete_reservation(c); + jffs2_free_raw_dirent(rd); + up(&dir_f->sem); + jffs2_clear_inode(inode); + return PTR_ERR(fd); + } + + dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); + + jffs2_free_raw_dirent(rd); + + /* Link the fd into the inode's list, obsoleting an old + one if necessary. */ + jffs2_add_fd_to_list(c, fd, &dir_f->dents); + + up(&dir_f->sem); + jffs2_complete_reservation(c); + + d_instantiate(dentry, inode); + + return 0; +} + +static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, + struct inode *new_dir_i, struct dentry *new_dentry) +{ + int ret; + struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); + struct jffs2_inode_info *victim_f = NULL; + uint8_t type; + + /* The VFS will check for us and prevent trying to rename a + * file over a directory and vice versa, but if it's a directory, + * the VFS can't check whether the victim is empty. The filesystem + * needs to do that for itself. + */ + if (new_dentry->d_inode) { + victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); + if (S_ISDIR(new_dentry->d_inode->i_mode)) { + struct jffs2_full_dirent *fd; + + down(&victim_f->sem); + for (fd = victim_f->dents; fd; fd = fd->next) { + if (fd->ino) { + up(&victim_f->sem); + return -ENOTEMPTY; + } + } + up(&victim_f->sem); + } + } + + /* XXX: We probably ought to alloc enough space for + both nodes at the same time. Writing the new link, + then getting -ENOSPC, is quite bad :) + */ + + /* Make a hard link */ + + /* XXX: This is ugly */ + type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; + if (!type) type = DT_REG; + + ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), + old_dentry->d_inode->i_ino, type, + new_dentry->d_name.name, new_dentry->d_name.len); + + if (ret) + return ret; + + if (victim_f) { + /* There was a victim. Kill it off nicely */ + new_dentry->d_inode->i_nlink--; + /* Don't oops if the victim was a dirent pointing to an + inode which didn't exist. */ + if (victim_f->inocache) { + down(&victim_f->sem); + victim_f->inocache->nlink--; + up(&victim_f->sem); + } + } + + /* If it was a directory we moved, and there was no victim, + increase i_nlink on its new parent */ + if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) + new_dir_i->i_nlink++; + + /* Unlink the original */ + ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), + old_dentry->d_name.name, old_dentry->d_name.len, NULL); + + /* We don't touch inode->i_nlink */ + + if (ret) { + /* Oh shit. We really ought to make a single node which can do both atomically */ + struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); + down(&f->sem); + old_dentry->d_inode->i_nlink++; + if (f->inocache) + f->inocache->nlink++; + up(&f->sem); + + printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); + /* Might as well let the VFS know */ + d_instantiate(new_dentry, old_dentry->d_inode); + atomic_inc(&old_dentry->d_inode->i_count); + return ret; + } + + if (S_ISDIR(old_dentry->d_inode->i_mode)) + old_dir_i->i_nlink--; + + return 0; +} + |
