+++ /dev/null
-/*
- * linux/fs/obdfs/namei.c
- *
- * This code is issued under the GNU General Public License.
- * See the file COPYING in this distribution
- *
- * Copyright (C) 1992, 1993, 1994, 1995
- * Remy Card (card@masi.ibp.fr)
- * Laboratoire MASI - Institut Blaise Pascal
- * Universite Pierre et Marie Curie (Paris VI)
- *
- * from
- *
- * linux/fs/ext2/namei.c
- *
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * Big-endian to little-endian byte-swapping/bitmaps by
- * David S. Miller (davem@caip.rutgers.edu), 1995
- * Directory entry file type support and forward compatibility hooks
- * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
- *
- * Changes for use in OBDFS
- * Copyright (c) 1999, Seagate Technology Inc.
- * Copyright (C) 2001, Cluster File Systems, Inc.
- * Rewritten based on recent ext2 page cache use.
- *
- */
-
-#include <linux/fs.h>
-#include <linux/locks.h>
-#include <linux/quotaops.h>
-
-#define DEBUG_SUBSYSTEM S_OBDFS
-
-#include <linux/obdfs.h>
-#include <linux/lustre_lite.h>
-extern struct address_space_operations obdfs_aops;
-
-/* from super.c */
-extern void obdfs_change_inode(struct inode *inode);
-extern int obdfs_setattr(struct dentry *de, struct iattr *attr);
-
-/* from dir.c */
-extern int ext2_add_link (struct dentry *dentry, struct inode *inode);
-obd_id obdfs_inode_by_name(struct inode * dir, struct dentry *dentry, int *typ);
-int ext2_make_empty(struct inode *inode, struct inode *parent);
-struct ext2_dir_entry_2 * ext2_find_entry (struct inode * dir,
- struct dentry *dentry, struct page ** res_page);
-int ext2_delete_entry (struct ext2_dir_entry_2 * dir, struct page * page );
-int ext2_empty_dir (struct inode * inode);
-struct ext2_dir_entry_2 * ext2_dotdot (struct inode *dir, struct page **p);
-void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
- struct page *page, struct inode *inode);
-
-/*
- * Couple of helper functions - make the code slightly cleaner.
- */
-static inline void ext2_inc_count(struct inode *inode)
-{
- inode->i_nlink++;
- obdfs_change_inode(inode);
-}
-
-/* postpone the disk update until the inode really goes away */
-static inline void ext2_dec_count(struct inode *inode)
-{
- inode->i_nlink--;
- if (inode->i_nlink > 0)
- obdfs_change_inode(inode);
-}
-
-static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
-{
- int err;
- err = ext2_add_link(dentry, inode);
- if (!err) {
- d_instantiate(dentry, inode);
- return 0;
- }
- ext2_dec_count(inode);
- iput(inode);
- return err;
-}
-
-/* methods */
-static struct dentry *obdfs_lookup(struct inode * dir, struct dentry *dentry)
-{
- struct obdo *oa;
- struct inode * inode = NULL;
- int type;
- obd_id ino;
-
- ENTRY;
- if (dentry->d_name.len > EXT2_NAME_LEN)
- return ERR_PTR(-ENAMETOOLONG);
-
- ino = obdfs_inode_by_name(dir, dentry, &type);
- if (!ino)
- goto negative;
-
- oa = obdo_fromid(IID(dir), ino, type,
- (__u32)(OBD_MD_FLNOTOBD | OBD_MD_FLBLOCKS));
- if ( IS_ERR(oa) ) {
- CERROR("obdo_fromid failed\n");
- EXIT;
- return ERR_PTR(-EACCES);
- }
-
- inode = iget4(dir->i_sb, (ino_t)ino, NULL, oa);
- obdo_free(oa);
-
- if (!inode)
- return ERR_PTR(-EACCES);
-
- negative:
- d_add(dentry, inode);
- return NULL;
-}
-
-
-/*
- * NOTE! unlike strncmp, ext2_match returns 1 for success, 0 for failure.
- *
- * `len <= EXT2_NAME_LEN' is guaranteed by caller.
- * `de != NULL' is guaranteed by caller.
- */
-static inline int ext2_match (int len, const char * const name,
- struct ext2_dir_entry_2 * de)
-{
- if (len != de->name_len)
- return 0;
- if (!de->inode)
- return 0;
- return !memcmp(name, de->name, len);
-}
-
-static struct inode *obdfs_new_inode(struct inode *dir, int mode)
-{
- struct obdo *oa;
- struct inode *inode;
- int err;
-
- ENTRY;
- oa = obdo_alloc();
- if (!oa) {
- EXIT;
- return ERR_PTR(-ENOMEM);
- }
-
- /* Send a hint to the create method on the type of file to create */
- oa->o_mode = mode;
- oa->o_valid = OBD_MD_FLTYPE | OBD_MD_FLMODE;
- CDEBUG(D_INODE, "\n");
- err = obd_create(IID(dir), oa, NULL);
- CDEBUG(D_INODE, "\n");
-
- if ( err ) {
- CERROR("new_inode - fatal: err %d\n", err);
- obdo_free(oa);
- EXIT;
- return ERR_PTR(err);
- }
- CDEBUG(D_INODE, "obdo mode %o\n", oa->o_mode);
-
- inode = iget4(dir->i_sb, (ino_t)oa->o_id, NULL, oa);
- CDEBUG(D_INODE, "\n");
-
- if (!inode) {
- CERROR("new_inode -fatal: %ld\n", (long)oa->o_id);
- obd_destroy(IID(dir), oa, NULL);
- obdo_free(oa);
- EXIT;
- return ERR_PTR(-EIO);
- }
- obdo_free(oa);
-
- if (!list_empty(&inode->i_dentry)) {
- CERROR("new_inode -fatal: aliases %ld, ct %d lnk %d\n",
- (long)oa->o_id,
- atomic_read(&inode->i_count),
- inode->i_nlink);
- obd_destroy(IID(dir), oa, NULL);
- iput(inode);
- EXIT;
- return ERR_PTR(-EIO);
- }
-
- EXIT;
- return inode;
-} /* obdfs_new_inode */
-
-
-/*
- * By the time this is called, we already have created
- * the directory cache entry for the new file, but it
- * is so far negative - it has no inode.
- *
- * If the create succeeds, we fill in the inode information
- * with d_instantiate().
- */
-static int obdfs_create (struct inode * dir, struct dentry * dentry, int mode)
-{
- struct inode * inode = obdfs_new_inode (dir, mode);
- int err = PTR_ERR(inode);
- if (!IS_ERR(inode)) {
- inode->i_op = &obdfs_file_inode_operations;
- inode->i_fop = &obdfs_file_operations;
- inode->i_mapping->a_ops = &obdfs_aops;
- err = ext2_add_nondir(dentry, inode);
- }
- return err;
-} /* obdfs_create */
-
-
-static int obdfs_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
-{
- struct inode * inode = obdfs_new_inode (dir, mode);
- int err = PTR_ERR(inode);
- if (!IS_ERR(inode)) {
- init_special_inode(inode, mode, rdev);
- obdfs_change_inode(inode);
- err = ext2_add_nondir(dentry, inode);
- }
- return err;
-}
-
-static int obdfs_symlink (struct inode * dir, struct dentry * dentry,
- const char * symname)
-{
- struct super_block * sb = dir->i_sb;
- int err = -ENAMETOOLONG;
- unsigned l = strlen(symname)+1;
- struct inode * inode;
- struct obdfs_inode_info *oinfo;
-
- if (l > sb->s_blocksize)
- goto out;
-
- inode = obdfs_new_inode (dir, S_IFLNK | S_IRWXUGO);
- err = PTR_ERR(inode);
- if (IS_ERR(inode))
- goto out;
-
- oinfo = obdfs_i2info(inode);
- if (l >= sizeof(oinfo->oi_inline)) {
- /* slow symlink */
- inode->i_op = &page_symlink_inode_operations;
- inode->i_mapping->a_ops = &obdfs_aops;
- err = block_symlink(inode, symname, l);
- if (err)
- goto out_fail;
- } else {
- /* fast symlink */
- inode->i_op = &obdfs_fast_symlink_inode_operations;
- memcpy(oinfo->oi_inline, symname, l);
- inode->i_size = l-1;
- }
- obdfs_change_inode(inode);
-
- err = ext2_add_nondir(dentry, inode);
-out:
- return err;
-
-out_fail:
- ext2_dec_count(inode);
- iput (inode);
- goto out;
-}
-
-
-
-static int obdfs_link (struct dentry * old_dentry, struct inode * dir,
- struct dentry *dentry)
-{
- struct inode *inode = old_dentry->d_inode;
-
- if (S_ISDIR(inode->i_mode))
- return -EPERM;
-
- if (inode->i_nlink >= EXT2_LINK_MAX)
- return -EMLINK;
-
- inode->i_ctime = CURRENT_TIME;
- ext2_inc_count(inode);
- atomic_inc(&inode->i_count);
-
- return ext2_add_nondir(dentry, inode);
-}
-
-
-static int obdfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
-{
- struct inode * inode;
- int err = -EMLINK;
- ENTRY;
-
- if (dir->i_nlink >= EXT2_LINK_MAX)
- goto out;
-
- ext2_inc_count(dir);
-
- inode = obdfs_new_inode (dir, S_IFDIR | mode);
- err = PTR_ERR(inode);
- if (IS_ERR(inode))
- goto out_dir;
-
- inode->i_op = &obdfs_dir_inode_operations;
- inode->i_fop = &obdfs_dir_operations;
- inode->i_mapping->a_ops = &obdfs_aops;
-
- ext2_inc_count(inode);
-
- err = ext2_make_empty(inode, dir);
- if (err)
- goto out_fail;
-
- err = ext2_add_link(dentry, inode);
- if (err)
- goto out_fail;
-
- d_instantiate(dentry, inode);
-out:
- EXIT;
- return err;
-
-out_fail:
- ext2_dec_count(inode);
- ext2_dec_count(inode);
- iput(inode);
- EXIT;
-out_dir:
- ext2_dec_count(dir);
- EXIT;
- goto out;
-}
-
-static int obdfs_unlink(struct inode * dir, struct dentry *dentry)
-{
- struct inode * inode = dentry->d_inode;
- struct ext2_dir_entry_2 * de;
- struct page * page;
- int err = -ENOENT;
-
- de = ext2_find_entry (dir, dentry, &page);
- if (!de)
- goto out;
-
- err = ext2_delete_entry (de, page);
- if (err)
- goto out;
-
- inode->i_ctime = dir->i_ctime;
- ext2_dec_count(inode);
- err = 0;
-out:
- return err;
-}
-
-
-static int obdfs_rmdir (struct inode * dir, struct dentry *dentry)
-{
- struct inode * inode = dentry->d_inode;
- int err = -ENOTEMPTY;
-
- if (ext2_empty_dir(inode)) {
- err = obdfs_unlink(dir, dentry);
- if (!err) {
- inode->i_size = 0;
- ext2_dec_count(inode);
- ext2_dec_count(dir);
- }
- }
- return err;
-}
-
-static int obdfs_rename (struct inode * old_dir, struct dentry * old_dentry,
- struct inode * new_dir, struct dentry * new_dentry )
-{
- struct inode * old_inode = old_dentry->d_inode;
- struct inode * new_inode = new_dentry->d_inode;
- struct page * dir_page = NULL;
- struct ext2_dir_entry_2 * dir_de = NULL;
- struct page * old_page;
- struct ext2_dir_entry_2 * old_de;
- int err = -ENOENT;
-
- old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
- if (!old_de)
- goto out;
-
- if (S_ISDIR(old_inode->i_mode)) {
- err = -EIO;
- dir_de = ext2_dotdot(old_inode, &dir_page);
- if (!dir_de)
- goto out_old;
- }
-
- if (new_inode) {
- struct page *new_page;
- struct ext2_dir_entry_2 *new_de;
-
- err = -ENOTEMPTY;
- if (dir_de && !ext2_empty_dir (new_inode))
- goto out_dir;
-
- err = -ENOENT;
- new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
- if (!new_de)
- goto out_dir;
- ext2_inc_count(old_inode);
- ext2_set_link(new_dir, new_de, new_page, old_inode);
- new_inode->i_ctime = CURRENT_TIME;
- if (dir_de)
- new_inode->i_nlink--;
- ext2_dec_count(new_inode);
- } else {
- if (dir_de) {
- err = -EMLINK;
- if (new_dir->i_nlink >= EXT2_LINK_MAX)
- goto out_dir;
- }
- ext2_inc_count(old_inode);
- err = ext2_add_link(new_dentry, old_inode);
- if (err) {
- ext2_dec_count(old_inode);
- goto out_dir;
- }
- if (dir_de)
- ext2_inc_count(new_dir);
- }
-
- ext2_delete_entry (old_de, old_page);
- ext2_dec_count(old_inode);
-
- if (dir_de) {
- ext2_set_link(old_inode, dir_de, dir_page, new_dir);
- ext2_dec_count(old_dir);
- }
- return 0;
-
-
-out_dir:
- if (dir_de) {
- kunmap(dir_page);
- page_cache_release(dir_page);
- }
-out_old:
- kunmap(old_page);
- page_cache_release(old_page);
-out:
- return err;
-}
-
-struct inode_operations obdfs_dir_inode_operations = {
- create: obdfs_create,
- lookup: obdfs_lookup,
- link: obdfs_link,
- unlink: obdfs_unlink,
- symlink: obdfs_symlink,
- mkdir: obdfs_mkdir,
- rmdir: obdfs_rmdir,
- mknod: obdfs_mknod,
- rename: obdfs_rename,
- setattr: obdfs_setattr
-};
git://git.whamcloud.com / fs / lustre-release.git / blobdiff