diff options
Diffstat (limited to 'fs/xiafs/namei.c')
| -rw-r--r-- | fs/xiafs/namei.c | 854 |
1 files changed, 0 insertions, 854 deletions
diff --git a/fs/xiafs/namei.c b/fs/xiafs/namei.c deleted file mode 100644 index b23c4bf71..000000000 --- a/fs/xiafs/namei.c +++ /dev/null @@ -1,854 +0,0 @@ -/* - * Linux/fs/xiafs/namei.c - * - * Copyright (C) Q. Frank Xia, 1993. - * - * Based on Linus' minix/namei.c - * Copyright (C) Linus Torvalds, 1991, 1992. - * - * This software may be redistributed per Linux Copyright. - */ - -#include <linux/sched.h> -#include <linux/xia_fs.h> -#include <linux/kernel.h> -#include <linux/string.h> -#include <linux/stat.h> -#include <linux/fcntl.h> -#include <linux/errno.h> - -#include <asm/uaccess.h> - -#include "xiafs_mac.h" - -#define RNDUP4(x) ((3+(u_long)(x)) & ~3) -/* - * ok, we cannot use strncmp, as the name is not in our data space. - * Thus we'll have to use xiafs_match. No big problem. Match also makes - * some sanity tests. - * - * NOTE! unlike strncmp, xiafs_match returns 1 for success, 0 for failure. - */ -static int xiafs_match(int len, const char * name, struct xiafs_direct * dep) -{ - int i; - - if (!dep || !dep->d_ino || len > _XIAFS_NAME_LEN) - return 0; - /* "" means "." ---> so paths like "/usr/lib//libc.a" work */ - if (!len && (dep->d_name[0]=='.') && (dep->d_name[1]=='\0')) - return 1; - if (len != dep->d_name_len) - return 0; - for (i=0; i < len; i++) - if (*name++ != dep->d_name[i]) - return 0; - return 1; -} - -/* - * xiafs_find_entry() - * - * finds an entry in the specified directory with the wanted name. It - * returns the cache buffer in which the entry was found, and the entry - * itself (as a parameter - res_dir). It does NOT read the inode of the - * entry - you'll have to do that yourself if you want to. - */ -static struct buffer_head * -xiafs_find_entry(struct inode * inode, const char * name, int namelen, - struct xiafs_direct ** res_dir, struct xiafs_direct ** res_pre) -{ - int i, zones, pos; - struct buffer_head * bh; - struct xiafs_direct * dep, * dep_pre; - - *res_dir = NULL; - if (!inode) - return NULL; - if (namelen > _XIAFS_NAME_LEN) - return NULL; - - if (inode->i_size & (XIAFS_ZSIZE(inode->i_sb) - 1)) { - printk("XIA-FS: bad dir size (%s %d)\n", WHERE_ERR); - return NULL; - } - zones=inode->i_size >> XIAFS_ZSIZE_BITS(inode->i_sb); - for (i=0; i < zones; i++ ) { - bh = xiafs_bread(inode, i, 0); - if (!bh) - continue; - dep_pre=dep=(struct xiafs_direct *)bh->b_data; - if (!i && (dep->d_rec_len != 12 || !dep->d_ino || - dep->d_name_len != 1 || strcmp(dep->d_name, "."))) { - printk("XIA-FS: bad directory (%s %d)\n", WHERE_ERR); - brelse(bh); - return NULL; - } - pos = 0; - while ( pos < XIAFS_ZSIZE(inode->i_sb) ) { - if (dep->d_ino > inode->i_sb->u.xiafs_sb.s_ninodes || - dep->d_rec_len < 12 || - dep->d_rec_len+(char *)dep > bh->b_data+XIAFS_ZSIZE(inode->i_sb) || - dep->d_name_len + 8 > dep->d_rec_len || dep->d_name_len <= 0 || - dep->d_name[dep->d_name_len] ) { - brelse(bh); - return NULL; - } - if (xiafs_match(namelen, name, dep)) { - *res_dir=dep; - if (res_pre) - *res_pre=dep_pre; - return bh; - } - pos += dep->d_rec_len; - dep_pre=dep; - dep=(struct xiafs_direct *)(bh->b_data + pos); - } - brelse(bh); - if (pos > XIAFS_ZSIZE(inode->i_sb)) { - printk("XIA-FS: bad directory (%s %d)\n", WHERE_ERR); - return NULL; - } - } - return NULL; -} - -int xiafs_lookup(struct inode * dir, const char * name, int len, - struct inode ** result) -{ - int ino; - struct xiafs_direct * dep; - struct buffer_head * bh; - - *result = NULL; - if (!dir) - return -ENOENT; - if (!S_ISDIR(dir->i_mode)) { - iput(dir); - return -ENOENT; - } - if (!(bh = xiafs_find_entry(dir, name, len, &dep, NULL))) { - iput(dir); - return -ENOENT; - } - ino = dep->d_ino; - brelse(bh); - if (!(*result = iget(dir->i_sb, ino))) { - iput(dir); - return -EACCES; - } - iput(dir); - return 0; -} - -/* - * xiafs_add_entry() - * - * adds a file entry to the specified directory, using the same - * semantics as xiafs_find_entry(). It returns NULL if it failed. - * - * NOTE!! The inode part of 'de' is left at 0 - which means you - * may not sleep between calling this and putting something into - * the entry, as someone else might have used it while you slept. - */ -static struct buffer_head * xiafs_add_entry(struct inode * dir, - const char * name, int namelen, struct xiafs_direct ** res_dir, - struct xiafs_direct ** res_pre) -{ - int i, pos, offset; - struct buffer_head * bh; - struct xiafs_direct * de, * de_pre; - - *res_dir = NULL; - if (!dir || !namelen || namelen > _XIAFS_NAME_LEN) - return NULL; - - if (dir->i_size & (XIAFS_ZSIZE(dir->i_sb) - 1)) { - printk("XIA-FS: bad dir size (%s %d)\n", WHERE_ERR); - return NULL; - } - pos=0; - for ( ; ; ) { - bh = xiafs_bread(dir, pos >> XIAFS_ZSIZE_BITS(dir->i_sb), pos ? 1:0); - if (!bh) - return NULL; - de_pre=de=(struct xiafs_direct *)bh->b_data; - if (!pos) { - if (de->d_rec_len != 12 || !de->d_ino || de->d_name_len != 1 || - strcmp(de->d_name, ".")) { - printk("XIA-FS: bad directory (%s %d)\n", WHERE_ERR); - brelse(bh); - return NULL; - } - offset = 12; - de_pre=de=(struct xiafs_direct *)(bh->b_data+12); - } else - offset = 0; - while (offset < XIAFS_ZSIZE(dir->i_sb)) { - if (pos >= dir->i_size) { - de->d_ino=0; - de->d_name_len=0; - de->d_name[0]=0; - de->d_rec_len=XIAFS_ZSIZE(dir->i_sb); - dir->i_size += XIAFS_ZSIZE(dir->i_sb); - dir->i_dirt = 1; - } else { - if (de->d_ino > dir->i_sb->u.xiafs_sb.s_ninodes || - de->d_rec_len < 12 || - (char *)de+de->d_rec_len > bh->b_data+XIAFS_ZSIZE(dir->i_sb) || - de->d_name_len + 8 > de->d_rec_len || - de->d_name[de->d_name_len]) { - printk("XIA-FS: bad directory entry (%s %d)\n", WHERE_ERR); - brelse(bh); - return NULL; - } - if (de->d_ino && - RNDUP4(de->d_name_len)+RNDUP4(namelen)+16<=de->d_rec_len) { - i=RNDUP4(de->d_name_len)+8; - de_pre=de; - de=(struct xiafs_direct *)(i+(u_char *)de_pre); - de->d_ino=0; - de->d_rec_len=de_pre->d_rec_len-i; - de_pre->d_rec_len=i; - } - } - if (!de->d_ino && RNDUP4(namelen)+8 <= de->d_rec_len) { - /* - * XXX all times should be set by caller upon successful - * completion. - */ - dir->i_ctime = dir->i_mtime = CURRENT_TIME; - dir->i_dirt = 1; - memcpy(de->d_name, name, namelen); - de->d_name[namelen]=0; - de->d_name_len=namelen; - mark_buffer_dirty(bh, 1); - *res_dir = de; - if (res_pre) - *res_pre = de_pre; - return bh; - } - offset+=de->d_rec_len; - de_pre=de; - de=(struct xiafs_direct *)(bh->b_data+offset); - } - brelse(bh); - if (offset > XIAFS_ZSIZE(dir->i_sb)) { - printk("XIA-FS: bad directory (%s %d)\n", WHERE_ERR); - return NULL; - } - pos+=XIAFS_ZSIZE(dir->i_sb); - } - return NULL; -} - -int xiafs_create(struct inode * dir, const char * name, int len, int mode, - struct inode ** result) -{ - struct inode * inode; - struct buffer_head * bh; - struct xiafs_direct * de; - - *result = NULL; - if (!dir) - return -ENOENT; - inode = xiafs_new_inode(dir); - if (!inode) { - iput(dir); - return -ENOSPC; - } - inode->i_op = &xiafs_file_inode_operations; - inode->i_mode = mode; - inode->i_dirt = 1; - bh = xiafs_add_entry(dir, name, len, &de, NULL); - if (!bh) { - inode->i_nlink--; - inode->i_dirt = 1; - iput(inode); - iput(dir); - return -ENOSPC; - } - de->d_ino = inode->i_ino; - mark_buffer_dirty(bh, 1); - brelse(bh); - iput(dir); - *result = inode; - return 0; -} - -int xiafs_mknod(struct inode *dir, const char *name, int len, int mode, int rdev) -{ - struct inode * inode; - struct buffer_head * bh; - struct xiafs_direct * de; - - if (!dir) - return -ENOENT; - bh = xiafs_find_entry(dir,name,len,&de, NULL); - if (bh) { - brelse(bh); - iput(dir); - return -EEXIST; - } - inode = xiafs_new_inode(dir); - if (!inode) { - iput(dir); - return -ENOSPC; - } - inode->i_uid = current->fsuid; - inode->i_mode = mode; - inode->i_op = NULL; - if (S_ISREG(inode->i_mode)) - inode->i_op = &xiafs_file_inode_operations; - else if (S_ISDIR(inode->i_mode)) { - inode->i_op = &xiafs_dir_inode_operations; - if (dir->i_mode & S_ISGID) - inode->i_mode |= S_ISGID; - } - else if (S_ISLNK(inode->i_mode)) - inode->i_op = &xiafs_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); - if (S_ISBLK(mode) || S_ISCHR(mode)) - inode->i_rdev = to_kdev_t(rdev); - inode->i_atime = inode->i_ctime = inode->i_atime = CURRENT_TIME; - inode->i_dirt = 1; - bh = xiafs_add_entry(dir, name, len, &de, NULL); - if (!bh) { - inode->i_nlink--; - inode->i_dirt = 1; - iput(inode); - iput(dir); - return -ENOSPC; - } - de->d_ino = inode->i_ino; - mark_buffer_dirty(bh, 1); - brelse(bh); - iput(dir); - iput(inode); - return 0; -} - -int xiafs_mkdir(struct inode * dir, const char * name, int len, int mode) -{ - struct inode * inode; - struct buffer_head * bh, *dir_block; - struct xiafs_direct * de; - - bh = xiafs_find_entry(dir,name,len,&de, NULL); - if (bh) { - brelse(bh); - iput(dir); - return -EEXIST; - } - if (dir->i_nlink > 64000) { - iput(dir); - return -EMLINK; - } - inode = xiafs_new_inode(dir); - if (!inode) { - iput(dir); - return -ENOSPC; - } - inode->i_op = &xiafs_dir_inode_operations; - inode->i_size = XIAFS_ZSIZE(dir->i_sb); - inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME; - inode->i_dirt = 1; - dir_block = xiafs_bread(inode,0,1); - if (!dir_block) { - iput(dir); - inode->i_nlink--; - inode->i_dirt = 1; - iput(inode); - return -ENOSPC; - } - de = (struct xiafs_direct *) dir_block->b_data; - de->d_ino=inode->i_ino; - strcpy(de->d_name,"."); - de->d_name_len=1; - de->d_rec_len=12; - de =(struct xiafs_direct *)(12 + dir_block->b_data); - de->d_ino = dir->i_ino; - strcpy(de->d_name,".."); - de->d_name_len=2; - de->d_rec_len=XIAFS_ZSIZE(dir->i_sb)-12; - inode->i_nlink = 2; - mark_buffer_dirty(dir_block, 1); - brelse(dir_block); - inode->i_mode = S_IFDIR | (mode & S_IRWXUGO & ~current->fs->umask); - if (dir->i_mode & S_ISGID) - inode->i_mode |= S_ISGID; - inode->i_dirt = 1; - bh = xiafs_add_entry(dir, name, len, &de, NULL); - if (!bh) { - iput(dir); - inode->i_nlink=0; - iput(inode); - return -ENOSPC; - } - de->d_ino = inode->i_ino; - mark_buffer_dirty(bh, 1); - dir->i_nlink++; - dir->i_dirt = 1; - iput(dir); - iput(inode); - brelse(bh); - return 0; -} - -/* - * routine to check that the specified directory is empty (for rmdir) - */ -static int empty_dir(struct inode * inode) -{ - int i, zones, offset; - struct buffer_head * bh; - struct xiafs_direct * de; - - if (inode->i_size & (XIAFS_ZSIZE(inode->i_sb)-1) ) { - printk("XIA-FS: bad directory (%s %d)\n", WHERE_ERR); - return 1; - } - - zones=inode->i_size >> XIAFS_ZSIZE_BITS(inode->i_sb); - for (i=0; i < zones; i++) { - bh = xiafs_bread(inode, i, 0); - if (!i) { - if (!bh) { - printk("XIA-FS: bad directory (%s %d)\n", WHERE_ERR); - return 1; - } - de=(struct xiafs_direct *)bh->b_data; - if (de->d_ino != inode->i_ino || strcmp(".", de->d_name) || - de->d_rec_len != 12 ) { - printk("XIA-FS: bad directory (%s %d)\n", WHERE_ERR); - brelse(bh); - return 1; - } - de=(struct xiafs_direct *)(12 + bh->b_data); - if (!de->d_ino || strcmp("..", de->d_name)) { - printk("XIA-FS: bad directory (%s %d)\n", WHERE_ERR); - brelse(bh); - return 1; - } - offset=de->d_rec_len+12; - } - else - offset = 0; - if (!bh) - continue; - while (offset < XIAFS_ZSIZE(inode->i_sb)) { - de=(struct xiafs_direct *)(bh->b_data+offset); - if (de->d_ino > inode->i_sb->u.xiafs_sb.s_ninodes || - de->d_rec_len < 12 || - (char *)de+de->d_rec_len > bh->b_data+XIAFS_ZSIZE(inode->i_sb) || - de->d_name_len + 8 > de->d_rec_len || - de->d_name[de->d_name_len]) { - printk("XIA-FS: bad directory (%s %d)\n", WHERE_ERR); - brelse(bh); - return 1; - } - if (de->d_ino) { - brelse(bh); - return 0; - } - offset+=de->d_rec_len; - } - brelse(bh); - } - return 1; -} - -static void xiafs_rm_entry(struct xiafs_direct *de, struct xiafs_direct * de_pre) -{ - if (de==de_pre) { - de->d_ino=0; - return; - } - while (de_pre->d_rec_len+(u_char *)de_pre < (u_char *)de) { - if (de_pre->d_rec_len < 12) { - printk("XIA-FS: bad directory entry (%s %d)\n", WHERE_ERR); - return; - } - de_pre=(struct xiafs_direct *)(de_pre->d_rec_len+(u_char *)de_pre); - } - if (de_pre->d_rec_len+(u_char *)de_pre > (u_char *)de) { - printk("XIA-FS: bad directory entry (%s %d)\n", WHERE_ERR); - return; - } - de_pre->d_rec_len+=de->d_rec_len; -} - -int xiafs_rmdir(struct inode * dir, const char * name, int len) -{ - int retval; - struct inode * inode; - struct buffer_head * bh; - struct xiafs_direct * de, * de_pre; - - inode = NULL; - bh = xiafs_find_entry(dir, name, len, &de, &de_pre); - retval = -ENOENT; - if (!bh) - goto end_rmdir; - retval = -EPERM; - if (!(inode = iget(dir->i_sb, de->d_ino))) - goto end_rmdir; - if ((dir->i_mode & S_ISVTX) && !fsuser() && - current->fsuid != inode->i_uid && - current->fsuid != dir->i_uid) - goto end_rmdir; - if (inode->i_dev != dir->i_dev) - goto end_rmdir; - if (inode == dir) /* we may not delete ".", but "../dir" is ok */ - goto end_rmdir; - if (!S_ISDIR(inode->i_mode)) { - retval = -ENOTDIR; - goto end_rmdir; - } - if (!empty_dir(inode)) { - retval = -ENOTEMPTY; - goto end_rmdir; - } - if (inode->i_count > 1) { - retval = -EBUSY; - goto end_rmdir; - } - if (inode->i_nlink != 2) - printk("XIA-FS: empty directory has nlink!=2 (%s %d)\n", WHERE_ERR); - xiafs_rm_entry(de, de_pre); - mark_buffer_dirty(bh, 1); - inode->i_nlink=0; - inode->i_dirt=1; - dir->i_nlink--; - inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME; - dir->i_dirt=1; - retval = 0; -end_rmdir: - iput(dir); - iput(inode); - brelse(bh); - return retval; -} - -int xiafs_unlink(struct inode * dir, const char * name, int len) -{ - int retval; - struct inode * inode; - struct buffer_head * bh; - struct xiafs_direct * de, * de_pre; - -repeat: - retval = -ENOENT; - inode = NULL; - bh = xiafs_find_entry(dir, name, len, &de, &de_pre); - if (!bh) - goto end_unlink; - if (!(inode = iget(dir->i_sb, de->d_ino))) - goto end_unlink; - retval = -EPERM; - if (S_ISDIR(inode->i_mode)) - goto end_unlink; - if (de->d_ino != inode->i_ino) { - iput(inode); - brelse(bh); - current->counter = 0; - schedule(); - goto repeat; - } - if ((dir->i_mode & S_ISVTX) && !fsuser() && - current->fsuid != inode->i_uid && - current->fsuid != dir->i_uid) - goto end_unlink; - if (!inode->i_nlink) { - printk("XIA-FS: Deleting nonexistent file (%s %d)\n", WHERE_ERR); - inode->i_nlink=1; - } - xiafs_rm_entry(de, de_pre); - mark_buffer_dirty(bh, 1); - inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME; - dir->i_dirt = 1; - inode->i_nlink--; - inode->i_dirt = 1; - retval = 0; -end_unlink: - brelse(bh); - iput(inode); - iput(dir); - return retval; -} - -int xiafs_symlink(struct inode * dir, const char * name, - int len, const char * symname) -{ - struct xiafs_direct * de; - struct inode * inode = NULL; - struct buffer_head * bh = NULL, * name_block = NULL; - int i; - char c; - - bh = xiafs_find_entry(dir,name,len, &de, NULL); - if (bh) { - brelse(bh); - iput(dir); - return -EEXIST; - } - if (!(inode = xiafs_new_inode(dir))) { - iput(dir); - return -ENOSPC; - } - inode->i_mode = S_IFLNK | S_IRWXUGO; - inode->i_op = &xiafs_symlink_inode_operations; - name_block = xiafs_bread(inode,0,1); - if (!name_block) { - iput(dir); - inode->i_nlink--; - inode->i_dirt = 1; - iput(inode); - return -ENOSPC; - } - for (i = 0; i < BLOCK_SIZE-1 && (c=*symname++); i++) - name_block->b_data[i] = c; - name_block->b_data[i] = 0; - mark_buffer_dirty(name_block, 1); - brelse(name_block); - inode->i_size = i; - inode->i_dirt = 1; - bh = xiafs_add_entry(dir, name, len, &de, NULL); - if (!bh) { - inode->i_nlink--; - inode->i_dirt = 1; - iput(inode); - iput(dir); - return -ENOSPC; - } - de->d_ino = inode->i_ino; - mark_buffer_dirty(bh, 1); - brelse(bh); - iput(dir); - iput(inode); - return 0; -} - -int xiafs_link(struct inode * oldinode, struct inode * dir, - const char * name, int len) -{ - struct xiafs_direct * de; - struct buffer_head * bh; - - if (S_ISDIR(oldinode->i_mode)) { - iput(oldinode); - iput(dir); - return -EPERM; - } - if (oldinode->i_nlink > 64000) { - iput(oldinode); - iput(dir); - return -EMLINK; - } - bh = xiafs_find_entry(dir, name, len, &de, NULL); - if (bh) { - brelse(bh); - iput(dir); - iput(oldinode); - return -EEXIST; - } - bh = xiafs_add_entry(dir, name, len, &de, NULL); - if (!bh) { - iput(dir); - iput(oldinode); - return -ENOSPC; - } - de->d_ino = oldinode->i_ino; - mark_buffer_dirty(bh, 1); - brelse(bh); - iput(dir); - oldinode->i_nlink++; - oldinode->i_ctime = CURRENT_TIME; - oldinode->i_dirt = 1; - iput(oldinode); - return 0; -} - -static int subdir(struct inode * new_inode, struct inode * old_inode) -{ - int ino; - int result; - - new_inode->i_count++; - result = 0; - for (;;) { - if (new_inode == old_inode) { - result = 1; - break; - } - if (new_inode->i_dev != old_inode->i_dev) - break; - ino = new_inode->i_ino; - if (xiafs_lookup(new_inode,"..",2,&new_inode)) - break; - if (new_inode->i_ino == ino) - break; - } - iput(new_inode); - return result; -} - -#define PARENT_INO(buffer) \ - (((struct xiafs_direct *) ((u_char *)(buffer) + 12))->d_ino) - -/* - * rename uses retry to avoid race-conditions: at least they should be minimal. - * it tries to allocate all the blocks, then sanity-checks, and if the sanity- - * checks fail, it tries to restart itself again. Very practical - no changes - * are done until we know everything works ok.. and then all the changes can be - * done in one fell swoop when we have claimed all the buffers needed. - * - * Anybody can rename anything with this: the permission checks are left to the - * higher-level routines. - */ -static int do_xiafs_rename(struct inode * old_dir, const char * old_name, - int old_len, struct inode * new_dir, - const char * new_name, int new_len, - int must_be_dir) -{ - struct inode * old_inode, * new_inode; - struct buffer_head * old_bh, * new_bh, * dir_bh; - struct xiafs_direct * old_de, * old_de_pre, * new_de, * new_de_pre; - int retval; - -try_again: - old_inode = new_inode = NULL; - old_bh = new_bh = dir_bh = NULL; - old_bh = xiafs_find_entry(old_dir, old_name, old_len, &old_de, &old_de_pre); - retval = -ENOENT; - if (!old_bh) - goto end_rename; - old_inode = __iget(old_dir->i_sb, old_de->d_ino, 0); /* don't cross mnt-points */ - if (!old_inode) - goto end_rename; - if (must_be_dir && !S_ISDIR(old_inode->i_mode)) - goto end_rename; - retval = -EPERM; - if ((old_dir->i_mode & S_ISVTX) && - current->fsuid != old_inode->i_uid && - current->fsuid != old_dir->i_uid && !fsuser()) - goto end_rename; - new_bh = xiafs_find_entry(new_dir, new_name, new_len, &new_de, NULL); - if (new_bh) { - new_inode = __iget(new_dir->i_sb, new_de->d_ino, 0); - if (!new_inode) { - brelse(new_bh); - new_bh = NULL; - } - } - if (new_inode == old_inode) { - retval = 0; - goto end_rename; - } - if (new_inode && S_ISDIR(new_inode->i_mode)) { - retval = -EEXIST; - goto end_rename; - } - retval = -EPERM; - if (new_inode && (new_dir->i_mode & S_ISVTX) && - current->fsuid != new_inode->i_uid && - current->fsuid != new_dir->i_uid && !fsuser()) - goto end_rename; - if (S_ISDIR(old_inode->i_mode)) { - retval = -EEXIST; - if (new_bh) - goto end_rename; - if ((retval = permission(old_inode, MAY_WRITE)) != 0) - goto end_rename; - retval = -EINVAL; - if (subdir(new_dir, old_inode)) - goto end_rename; - retval = -EIO; - dir_bh = xiafs_bread(old_inode,0,0); - if (!dir_bh) - goto end_rename; - if (PARENT_INO(dir_bh->b_data) != old_dir->i_ino) - goto end_rename; - retval = -EMLINK; - if (new_dir->i_nlink > 64000) - goto end_rename; - } - if (!new_bh) - new_bh = xiafs_add_entry(new_dir, new_name, new_len, &new_de, &new_de_pre); - retval = -ENOSPC; - if (!new_bh) - goto end_rename; - /* sanity checking */ - if ( (new_inode && (new_de->d_ino != new_inode->i_ino)) - || (new_de->d_ino && !new_inode) - || (old_de->d_ino != old_inode->i_ino)) { - xiafs_rm_entry(new_de, new_de_pre); - brelse(old_bh); - brelse(new_bh); - brelse(dir_bh); - iput(old_inode); - iput(new_inode); - current->counter=0; - schedule(); - goto try_again; - } - xiafs_rm_entry(old_de, old_de_pre); - new_de->d_ino = old_inode->i_ino; - if (new_inode) { - new_inode->i_nlink--; - new_inode->i_dirt = 1; - } - mark_buffer_dirty(old_bh, 1); - mark_buffer_dirty(new_bh, 1); - if (dir_bh) { - PARENT_INO(dir_bh->b_data) = new_dir->i_ino; - mark_buffer_dirty(dir_bh, 1); - old_dir->i_nlink--; - new_dir->i_nlink++; - old_dir->i_dirt = 1; - new_dir->i_dirt = 1; - } - retval = 0; -end_rename: - brelse(dir_bh); - brelse(old_bh); - brelse(new_bh); - iput(old_inode); - iput(new_inode); - iput(old_dir); - iput(new_dir); - return retval; -} - -/* - * Ok, rename also locks out other renames, as they can change the parent of - * a directory, and we don't want any races. Other races are checked for by - * "do_rename()", which restarts if there are inconsistencies. - * - * Note that there is no race between different filesystems: it's only within - * the same device that races occur: many renames can happen at once, as long - * as they are on different partitions. - */ -int xiafs_rename(struct inode * old_dir, const char * old_name, int old_len, - struct inode * new_dir, const char * new_name, int new_len, - int must_be_dir) -{ - static struct wait_queue * wait = NULL; - static int lock = 0; - int result; - - while (lock) - sleep_on(&wait); - lock = 1; - result = do_xiafs_rename(old_dir, old_name, old_len, - new_dir, new_name, new_len, - must_be_dir); - lock = 0; - wake_up(&wait); - return result; -} |