/*
* 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
* 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
+ * 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 <asm/uaccess.h>
-
-#include <linux/errno.h>
#include <linux/fs.h>
-#include <linux/ext2_fs.h>
-#include <linux/fcntl.h>
-#include <linux/sched.h>
-#include <linux/stat.h>
-#include <linux/string.h>
#include <linux/locks.h>
#include <linux/quotaops.h>
-#include <linux/iobuf.h>
-#include <linux/obd_support.h>
-#include <linux/obdfs.h>
+#define DEBUG_SUBSYSTEM S_OBDFS
-/*
- * define how far ahead to read directories while searching them.
- */
-#define NAMEI_RA_CHUNKS 2
-#define NAMEI_RA_BLOCKS 4
-#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
-#define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b))
+#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);
+ino_t 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);
/*
- * 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.
+ * Couple of helper functions - make the code slightly cleaner.
*/
-static inline int ext2_match (int len, const char * const name,
- struct ext2_dir_entry_2 * de)
+static inline void ext2_inc_count(struct inode *inode)
{
- if (len != de->name_len)
- return 0;
- if (!de->inode)
- return 0;
- return !memcmp(name, de->name, len);
+ inode->i_nlink++;
+ obdfs_change_inode(inode);
}
-/*
- * obdfs_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 page * obdfs_find_entry (struct inode * dir,
- const char * const name, int namelen,
- struct ext2_dir_entry_2 ** res_dir,
- int lock)
-{
- struct super_block * sb;
- unsigned long offset;
- struct page * page;
- ENTRY;
- CDEBUG(D_INODE, "find entry for %*s\n", namelen, name);
-
- *res_dir = NULL;
- sb = dir->i_sb;
-
- if (namelen > EXT2_NAME_LEN)
- return NULL;
-
- CDEBUG(D_INODE, "dirsize is %Ld\n", dir->i_size);
-
- page = 0;
- offset = 0;
- while ( offset < dir->i_size ) {
- struct ext2_dir_entry_2 * de;
- char * dlimit;
-
- page = obdfs_getpage(dir, offset, 0, lock);
-
- if ( !page ) {
- CDEBUG(D_INODE, "No page, offset %lx\n", offset);
- return NULL;
- }
-
- de = (struct ext2_dir_entry_2 *) page_address(page);
- dlimit = (char *)page_address(page) + PAGE_SIZE;
- while ((char *) de < dlimit) {
- /* this code is executed quadratically often */
- /* do minimal checking `by hand' */
- int de_len;
- /* CDEBUG(D_INODE, "Entry %p len %d, page at %#lx - %#lx , offset %lx\n",
- de, le16_to_cpu(de->rec_len), page_address(page),
- page_address(page) + PAGE_SIZE, offset); */
-
- if ((char *) de + namelen <= dlimit &&
- ext2_match (namelen, name, de)) {
- /* found a match -
- just to be sure, do a full check */
- if (!obdfs_check_dir_entry("ext2_find_entry",
- dir, de, page, offset))
- goto failure;
- *res_dir = de;
- EXIT;
- return page;
- }
- /* prevent looping on a bad block */
- de_len = le16_to_cpu(de->rec_len);
- if (de_len <= 0) {
- printk("Bad entry at %p len %d\n", de, de_len);
- goto failure;
- }
- offset += de_len;
- de = (struct ext2_dir_entry_2 *)
- ((char *) de + de_len);
- /* CDEBUG(D_INODE, "Next while %lx\n", offset); */
- }
- if ( lock )
- UnlockPage(page);
- page_cache_release(page);
- page = NULL;
- CDEBUG(D_INODE, "Next for %lx\n", offset);
- }
-
-failure:
- CDEBUG(D_INODE, "Negative case, page %p, offset %ld\n", page, offset);
- if (page) {
- if (lock)
- UnlockPage(page);
- page_cache_release(page);
- }
- EXIT;
- return NULL;
-} /* obdfs_find_entry */
-
-struct dentry *obdfs_lookup(struct inode *dir, struct dentry *dentry)
+/* postpone the disk update until the inode really goes away */
+static inline void ext2_dec_count(struct inode *inode)
{
- struct inode *inode;
- struct ext2_dir_entry_2 *de;
- struct page *page;
- ENTRY;
-
- if (dentry->d_name.len > EXT2_NAME_LEN)
- return ERR_PTR(-ENAMETOOLONG);
-
- page = obdfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
- &de, LOCKED);
- inode = NULL;
- if ( !page )
- CDEBUG(D_INODE, "No page - negative entry.\n");
- if ( page && !de ) {
- CDEBUG(D_INODE, "Danger: PAGE but de.\n");
- return ERR_PTR(-ENOENT);
- }
- if (page) {
- unsigned long ino = le32_to_cpu(de->inode);
- UnlockPage(page);
- page_cache_release(page);
- inode = iget(dir->i_sb, ino);
-
- if (!inode) {
- CDEBUG(D_INODE, "No inode.\n");
- EXIT;
- return ERR_PTR(-EACCES);
- }
- }
- d_add(dentry, inode);
- EXIT;
- return NULL;
-} /* obdfs_lookup */
-
-
-/*
- * obdfs_add_entry()
- *
- * adds a file entry to the specified directory, using the same
- * semantics as ext2_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.
-
- * returns a locked and held page upon success
- */
-
-/* XXX I believe these pages should in fact NOT be locked */
+ inode->i_nlink--;
+ if (inode->i_nlink > 0)
+ obdfs_change_inode(inode);
+}
-static struct page *obdfs_add_entry (struct inode * dir,
- const char * name, int namelen,
- struct ext2_dir_entry_2 ** res_dir,
- int *err)
+static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
{
- unsigned long offset;
- unsigned short rec_len;
- struct page *page;
- struct ext2_dir_entry_2 * de, * de1;
- struct super_block * sb;
-
- ENTRY;
- *err = -EINVAL;
- *res_dir = NULL;
- if (!dir || !dir->i_nlink) {
- EXIT;
- return NULL;
- }
- sb = dir->i_sb;
-
- if (!namelen) {
- EXIT;
- return NULL;
- }
- /*
- * Is this a busy deleted directory? Can't create new files if so
- */
- if (dir->i_size == 0)
- {
- EXIT;
- *err = -ENOENT;
- return NULL;
- }
- page = obdfs_getpage(dir, 0, 0, LOCKED);
- if (!page) {
- EXIT;
- return NULL;
- }
- rec_len = EXT2_DIR_REC_LEN(namelen);
- CDEBUG(D_INODE, "reclen: %d\n", rec_len);
- PDEBUG(page, "starting search");
- offset = 0;
- de = (struct ext2_dir_entry_2 *) page_address(page);
- *err = -ENOSPC;
- while (1) {
- CDEBUG(D_INODE, "Considering entry at %p, (page at %#lx - %#lx), offset %ld\n",
- de, page_address(page), page_address(page) + PAGE_SIZE, offset);
- if ((char *)de >= PAGE_SIZE + (char *)page_address(page)) {
- UnlockPage(page);
- page_cache_release(page);
- page = obdfs_getpage(dir, offset, 1, LOCKED);
- if (!page) {
- EXIT;
- return NULL;
- }
- PDEBUG(page, "new directory page");
- if (dir->i_size <= offset) {
- if (dir->i_size == 0) {
- *err = -ENOENT;
- EXIT;
- return NULL;
- }
-
- CDEBUG(D_INODE, "creating next block\n");
-
- de = (struct ext2_dir_entry_2 *) page_address(page);
- de->inode = 0;
- de->rec_len = le16_to_cpu(PAGE_SIZE);
- dir->i_size = offset + PAGE_SIZE;
- dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
- mark_inode_dirty(dir);
- } else {
-
- ext2_debug ("skipping to next block\n");
-
- de = (struct ext2_dir_entry_2 *) page_address(page);
- }
- }
- CDEBUG(D_INODE, "\n");
- if (!obdfs_check_dir_entry ("ext2_add_entry", dir, de, page,
- offset)) {
- *err = -ENOENT;
- UnlockPage(page);
- page_cache_release(page);
- EXIT;
- return NULL;
- }
- CDEBUG(D_INODE, "\n");
- if (ext2_match (namelen, name, de)) {
- *err = -EEXIST;
- UnlockPage(page);
- page_cache_release(page);
- EXIT;
- return NULL;
- }
- CDEBUG(D_INODE, "Testing for enough space at de %p\n", de);
- if ( (le32_to_cpu(de->inode) == 0 && le16_to_cpu(de->rec_len) >= rec_len) ||
- (le16_to_cpu(de->rec_len) >= EXT2_DIR_REC_LEN(de->name_len) + rec_len)) {
- offset += le16_to_cpu(de->rec_len);
- CDEBUG(D_INODE, "Found enough space de %p, offset %#lx\n", de, offset);
- if (le32_to_cpu(de->inode)) {
- CDEBUG(D_INODE, "Inserting new in %p\n", de);
- de1 = (struct ext2_dir_entry_2 *) ((char *) de +
- EXT2_DIR_REC_LEN(de->name_len));
- CDEBUG(D_INODE, "-- de1 at %p\n", de1);
- de1->rec_len = cpu_to_le16(le16_to_cpu(de->rec_len) -
- EXT2_DIR_REC_LEN(de->name_len));
- de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(de->name_len));
- de = de1;
- }
- CDEBUG(D_INODE, "Reclen adjusted; copy %d bytes to %p, page at %#lx EOP at %#lx\n", namelen, de->name, page_address(page), page_address(page) + PAGE_SIZE);
- de->inode = 0;
- de->name_len = namelen;
- de->file_type = 0;
- memcpy (de->name, name, namelen);
- CDEBUG(D_INODE, "Copy done\n");
- /*
- * XXX shouldn't update any times until successful
- * completion of syscall, but too many callers depend
- * on this.
- *
- * XXX similarly, too many callers depend on
- * ext2_new_inode() setting the times, but error
- * recovery deletes the inode, so the worst that can
- * happen is that the times are slightly out of date
- * and/or different from the directory change time.
- */
- dir->i_mtime = dir->i_ctime = CURRENT_TIME;
- dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
- mark_inode_dirty(dir);
- dir->i_version = ++event;
- *res_dir = de;
- *err = 0;
- PDEBUG(page, "add_entry");
- CDEBUG(D_INODE, "Regular exit from add_entry");
- EXIT;
- return page;
- }
- CDEBUG(D_INODE, "\n");
- offset += le16_to_cpu(de->rec_len);
- de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
-
- }
- CDEBUG(D_INODE, "\n");
-
- UnlockPage(page);
- page_cache_release(page);
- PDEBUG(page, "add_entry");
- EXIT;
- return NULL;
-} /* obdfs_add_entry */
+ int err;
+ err = ext2_add_link(dentry, inode);
+ if (!err) {
+ d_instantiate(dentry, inode);
+ return 0;
+ }
+ ext2_dec_count(inode);
+ iput(inode);
+ return err;
+}
-/*
- * obdfs_delete_entry deletes a directory entry by merging it with the
- * previous entry
- */
-static int obdfs_delete_entry (struct ext2_dir_entry_2 * dir,
- struct page * page)
+/* methods */
+static struct dentry *obdfs_lookup(struct inode * dir, struct dentry *dentry)
{
- struct ext2_dir_entry_2 * de, * pde;
- int i;
-
- i = 0;
- pde = NULL;
- de = (struct ext2_dir_entry_2 *) page_address(page);
- while (i < PAGE_SIZE) {
- if (!obdfs_check_dir_entry ("ext2_delete_entry", NULL,
- de, page, i))
- return -EIO;
- if (de == dir) {
- if (pde)
- pde->rec_len =
- cpu_to_le16(le16_to_cpu(pde->rec_len) +
- le16_to_cpu(dir->rec_len));
- else
- dir->inode = 0;
- return 0;
- }
- i += le16_to_cpu(de->rec_len);
- pde = de;
- de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
- }
- return -ENOENT;
-} /* obdfs_delete_entry */
-
-
-static inline void ext2_set_de_type(struct super_block *sb,
- struct ext2_dir_entry_2 *de,
- umode_t mode) {
- if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_FILETYPE))
- return;
- if (S_ISCHR(mode))
- de->file_type = EXT2_FT_CHRDEV;
- else if (S_ISBLK(mode))
- de->file_type = EXT2_FT_BLKDEV;
- else if (S_ISFIFO(mode))
- de->file_type = EXT2_FT_FIFO;
- else if (S_ISLNK(mode))
- de->file_type = EXT2_FT_SYMLINK;
- else if (S_ISREG(mode))
- de->file_type = EXT2_FT_REG_FILE;
- else if (S_ISDIR(mode))
- de->file_type = EXT2_FT_DIR;
+ struct obdo *oa;
+ struct inode * inode = NULL;
+ int type;
+ ino_t 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,
+ 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, NULL, oa);
+ obdo_free(oa);
+
+ if (!inode)
+ return ERR_PTR(-EACCES);
+
+ negative:
+ d_add(dentry, inode);
+ return NULL;
}
/*
- * Display all dentries holding the specified inode.
+ * 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.
*/
-#if 0
-static void show_dentry(struct list_head * dlist, int subdirs)
+static inline int ext2_match (int len, const char * const name,
+ struct ext2_dir_entry_2 * de)
{
- struct list_head *tmp = dlist;
-
- while ((tmp = tmp->next) != dlist) {
- struct dentry * dentry;
- const char * unhashed = "";
-
- if ( subdirs )
- dentry = list_entry(tmp, struct dentry, d_child);
- else
- dentry = list_entry(tmp, struct dentry, d_alias);
-
- if (list_empty(&dentry->d_hash))
- unhashed = "(unhashed)";
-
- if ( dentry->d_inode )
- printk("show_dentry: %s/%s, d_count=%d%s (ino %ld, dev %d, ct %d)\n",
- dentry->d_parent->d_name.name,
- dentry->d_name.name, dentry->d_count,
- unhashed, dentry->d_inode->i_ino,
- dentry->d_inode->i_dev,
- dentry->d_inode->i_count);
- else
- printk("show_dentry: %s/%s, d_count=%d%s \n",
- dentry->d_parent->d_name.name,
- dentry->d_name.name, dentry->d_count,
- unhashed);
- }
-} /* show_dentry */
-#endif
-
+ 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_FLMODE;
-
- err = IOPS(dir, create)(IID(dir), oa);
-
- if ( err ) {
- obdo_free(oa);
- EXIT;
- return ERR_PTR(err);
- }
-
- inode = iget(dir->i_sb, (ino_t)oa->o_id);
-
- if (!inode) {
- IOPS(dir, destroy)(IID(dir), oa);
- obdo_free(oa);
- EXIT;
- return ERR_PTR(-EIO);
- }
-
- if (!list_empty(&inode->i_dentry)) {
- CDEBUG(D_INODE, "New inode (%ld) has aliases!\n", inode->i_ino);
- IOPS(dir, destroy)(IID(dir), oa);
- obdo_free(oa);
- iput(inode);
- EXIT;
- return ERR_PTR(-EIO);
- }
- obdo_free(oa);
- INIT_LIST_HEAD(&OBDFS_LIST(inode));
-
- EXIT;
- return inode;
+ 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_FLMODE;
+ CDEBUG(D_INODE, "\n");
+ err = obd_create(IID(dir), oa);
+ 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);
+ 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);
+ iput(inode);
+ EXIT;
+ return ERR_PTR(-EIO);
+ }
+
+ EXIT;
+ return inode;
} /* obdfs_new_inode */
* If the create succeeds, we fill in the inode information
* with d_instantiate().
*/
-int obdfs_create (struct inode * dir, struct dentry * dentry, int mode)
+static int obdfs_create (struct inode * dir, struct dentry * dentry, int mode)
{
- struct inode * inode;
- struct page *page;
- struct ext2_dir_entry_2 * de;
- int err = -EIO;
-
- ENTRY;
- inode = obdfs_new_inode(dir, mode);
- if ( IS_ERR(inode) ) {
- EXIT;
- return PTR_ERR(inode);
- }
-
- inode->i_op = &obdfs_file_inode_operations;
- mark_inode_dirty(inode);
- page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
- if (!page) {
- inode->i_nlink--;
- mark_inode_dirty(inode);
- iput (inode);
- EXIT;
- return err;
- }
- de->inode = cpu_to_le32(inode->i_ino);
- ext2_set_de_type(dir->i_sb, de, S_IFREG);
- dir->i_version = ++event;
-
- err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
- UnlockPage(page);
-
- page_cache_release(page);
- d_instantiate(dentry, inode);
- EXIT;
- return err;
+ 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 */
-int obdfs_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
+
+static int obdfs_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
{
- struct inode * inode;
- struct page *page;
- struct ext2_dir_entry_2 * de;
- int err;
+ 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;
+}
- ENTRY;
- inode = obdfs_new_inode(dir, mode);
- if ( IS_ERR(inode) ) {
- EXIT;
- return PTR_ERR(inode);
- }
-
- inode->i_uid = current->fsuid;
- init_special_inode(inode, mode, rdev);
- page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
- if (!page)
- goto out_no_entry;
- de->inode = cpu_to_le32(inode->i_ino);
- dir->i_version = ++event;
- ext2_set_de_type(dir->i_sb, de, inode->i_mode);
- mark_inode_dirty(inode);
-
- err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
- UnlockPage(page);
-
- d_instantiate(dentry, inode);
- page_cache_release(page);
- err = 0;
+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;
+ return err;
+
+out_fail:
+ ext2_dec_count(inode);
+ iput (inode);
+ goto out;
+}
+
-out_no_entry:
- inode->i_nlink--;
- mark_inode_dirty(inode);
- iput(inode);
- goto out;
-} /* obdfs_mknod */
-int obdfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
+static int obdfs_link (struct dentry * old_dentry, struct inode * dir,
+ struct dentry *dentry)
{
- struct inode * inode;
- struct page *page, *inode_page;
- struct ext2_dir_entry_2 * de;
- int err;
-
- ENTRY;
-
- err = -EMLINK;
- if (dir->i_nlink >= EXT2_LINK_MAX)
- goto out;
-
- mode |= S_IFDIR;
- if (dir->i_mode & S_ISGID)
- mode |= S_ISGID;
-
- inode = obdfs_new_inode(dir, mode);
- if ( IS_ERR(inode) ) {
- EXIT;
- return PTR_ERR(inode);
- }
-
- inode->i_op = &obdfs_dir_inode_operations;
- inode->i_blocks = 0;
- inode_page = obdfs_getpage(inode, 0, 1, LOCKED);
- if (!inode_page) {
- inode->i_nlink--; /* is this nlink == 0? */
- mark_inode_dirty(inode);
- iput (inode);
- return err;
- }
-
- /* create . and .. */
- de = (struct ext2_dir_entry_2 *) page_address(inode_page);
- de->inode = cpu_to_le32(inode->i_ino);
- de->name_len = 1;
- de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(de->name_len));
- strcpy (de->name, ".");
- ext2_set_de_type(dir->i_sb, de, S_IFDIR);
-
- de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
- de->inode = cpu_to_le32(dir->i_ino);
- de->rec_len = cpu_to_le16(PAGE_SIZE - EXT2_DIR_REC_LEN(1));
- de->name_len = 2;
- strcpy (de->name, "..");
- ext2_set_de_type(dir->i_sb, de, S_IFDIR);
-
- /* XXX handle err */
- err = obdfs_do_writepage(inode, inode_page, IS_SYNC(inode));
- inode->i_blocks = PAGE_SIZE/inode->i_sb->s_blocksize;
- inode->i_size = PAGE_SIZE;
- UnlockPage(inode_page);
- page_cache_release(inode_page);
-
- inode->i_nlink = 2;
- mark_inode_dirty(inode);
-
- /* now deal with the parent */
- page = obdfs_add_entry(dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
- if (!page) {
- goto out_no_entry;
- }
-
- de->inode = cpu_to_le32(inode->i_ino);
- ext2_set_de_type(dir->i_sb, de, S_IFDIR);
- dir->i_version = ++event;
-
- dir->i_nlink++;
- dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
- mark_inode_dirty(dir);
- err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
- /* XXX handle err? */
-
- UnlockPage(page);
-
- page_cache_release(page);
- d_instantiate(dentry, inode);
-out:
- EXIT;
- return err;
+ struct inode *inode = old_dentry->d_inode;
-out_no_entry:
- inode->i_nlink = 0;
- mark_inode_dirty(inode);
- iput (inode);
- EXIT;
- goto out;
-} /* obdfs_mkdir */
+ if (S_ISDIR(inode->i_mode))
+ return -EPERM;
+ if (inode->i_nlink >= EXT2_LINK_MAX)
+ return -EMLINK;
-/*
- * routine to check that the specified directory is empty (for rmdir)
- */
-static int empty_dir (struct inode * inode)
-{
- unsigned long offset;
- struct page *page;
- struct ext2_dir_entry_2 * de, * de1;
- struct super_block * sb;
-
- sb = inode->i_sb;
- if (inode->i_size < EXT2_DIR_REC_LEN(1) + EXT2_DIR_REC_LEN(2) ||
- !(page = obdfs_getpage (inode, 0, 0, LOCKED))) {
- ext2_warning (inode->i_sb, "empty_dir",
- "bad directory (dir #%lu) - no data block",
- inode->i_ino);
- return 1;
- }
- de = (struct ext2_dir_entry_2 *) page_address(page);
- de1 = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
- if (le32_to_cpu(de->inode) != inode->i_ino || !le32_to_cpu(de1->inode) ||
- strcmp (".", de->name) || strcmp ("..", de1->name)) {
- ext2_warning (inode->i_sb, "empty_dir",
- "bad directory (dir #%lu) - no `.' or `..'",
- inode->i_ino);
- page_cache_release(page);
- return 1;
- }
- offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len);
- de = (struct ext2_dir_entry_2 *) ((char *) de1 + le16_to_cpu(de1->rec_len));
- while (offset < inode->i_size ) {
- if (!page || (void *) de >= (void *) (page_address(page) + PAGE_SIZE)) {
- if (page) {
- UnlockPage(page);
- page_cache_release(page);
- }
- page = obdfs_getpage(inode, offset, 0, LOCKED);
- if (!page) {
-#if 0
- ext2_error (sb, "empty_dir",
- "directory #%lu contains a hole at offset %lu",
- inode->i_ino, offset);
-#endif
- offset += sb->s_blocksize;
- continue;
- }
- de = (struct ext2_dir_entry_2 *) page_address(page);
- }
- if (!obdfs_check_dir_entry ("empty_dir", inode, de, page,
- offset)) {
- UnlockPage(page);
- page_cache_release(page);
- return 1;
- }
- if (le32_to_cpu(de->inode)) {
- UnlockPage(page);
- page_cache_release(page);
- return 0;
- }
- offset += le16_to_cpu(de->rec_len);
- de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
- }
- UnlockPage(page);
- page_cache_release(page);
- return 1;
-} /* empty_dir */
-
-int obdfs_rmdir (struct inode * dir, struct dentry *dentry)
-{
- int retval;
- struct inode * inode;
- struct page *page;
- struct ext2_dir_entry_2 * de;
- int err;
-
- ENTRY;
-
- retval = -ENOENT;
- page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
- if (!page)
- goto end_rmdir;
-
- inode = dentry->d_inode;
- DQUOT_INIT(inode);
-
- retval = -EIO;
- if (le32_to_cpu(de->inode) != inode->i_ino)
- goto end_rmdir;
-
- retval = -ENOTEMPTY;
- if (!empty_dir (inode))
- goto end_rmdir;
-
- retval = obdfs_delete_entry (de, page);
- dir->i_version = ++event;
- if (retval)
- goto end_rmdir;
- err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
- /* XXX handle err? */
- UnlockPage(page);
-
- if (inode->i_nlink != 2)
- ext2_warning (inode->i_sb, "ext2_rmdir",
- "empty directory has nlink!=2 (%d)",
- inode->i_nlink);
- inode->i_version = ++event;
- inode->i_nlink = 0;
- inode->i_size = 0;
- mark_inode_dirty(inode);
- dir->i_nlink--;
- inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
- dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
- mark_inode_dirty(dir);
- d_delete(dentry);
-
-end_rmdir:
- if ( page )
- page_cache_release(page);
- EXIT;
- return retval;
-} /* obdfs_rmdir */
-
-int obdfs_unlink(struct inode * dir, struct dentry *dentry)
-{
- int retval;
- struct inode * inode;
- struct page *page;
- struct ext2_dir_entry_2 * de;
- int err;
+ inode->i_ctime = CURRENT_TIME;
+ ext2_inc_count(inode);
+ atomic_inc(&inode->i_count);
- ENTRY;
+ return ext2_add_nondir(dentry, inode);
+}
- retval = -ENOENT;
- page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
- if (!page)
- goto end_unlink;
-
- inode = dentry->d_inode;
- DQUOT_INIT(inode);
-
- retval = -EIO;
- if (le32_to_cpu(de->inode) != inode->i_ino)
- goto end_unlink;
-
- if (!inode->i_nlink) {
- ext2_warning (inode->i_sb, "ext2_unlink",
- "Deleting nonexistent file (%lu), %d",
- inode->i_ino, inode->i_nlink);
- inode->i_nlink = 1;
- }
- retval = obdfs_delete_entry (de, page);
- if (retval)
- goto end_unlink;
- dir->i_version = ++event;
- err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
- /* XXX handle err? */
- UnlockPage(page);
-
- dir->i_ctime = dir->i_mtime = CURRENT_TIME;
- dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
- mark_inode_dirty(dir);
- inode->i_nlink--;
- mark_inode_dirty(inode);
- inode->i_ctime = dir->i_ctime;
- retval = 0;
- d_delete(dentry); /* This also frees the inode */
-
-end_unlink:
- if (page)
- page_cache_release(page);
- EXIT;
- return retval;
-} /* obdfs_unlink */
-
-int obdfs_symlink (struct inode * dir, struct dentry *dentry,
- const char * symname)
-{
- struct ext2_dir_entry_2 * de;
- struct inode * inode;
- struct obdfs_inode_info *oinfo;
- struct page* page = NULL, * name_page = NULL;
- char * link;
- int i, l, err = -EIO;
- char c;
- ENTRY;
- inode = obdfs_new_inode(dir, S_IFLNK | S_IRWXUGO);
- if ( IS_ERR(inode) ) {
- EXIT;
- return PTR_ERR(inode);
- }
-
- inode->i_op = &obdfs_symlink_inode_operations;
- for (l = 0; l < inode->i_sb->s_blocksize - 1 && symname [l]; l++)
- ;
-
- oinfo = OBDFS_INFO(inode);
-
- if (l >= sizeof(oinfo->oi_inline)) {
- CDEBUG(D_INODE, "l=%d, normal symlink\n", l);
-
- name_page = obdfs_getpage(inode, 0, 1, LOCKED);
- if (!name_page) {
- inode->i_nlink--;
- mark_inode_dirty(inode);
- iput (inode);
- EXIT;
- return err;
- }
- link = (char *)page_address(name_page);
- } else {
- link = oinfo->oi_inline;
- oinfo->oi_flags |= OBD_FL_INLINEDATA;
-
- CDEBUG(D_INODE, "l=%d, fast symlink\n", l);
- }
- i = 0;
- while (i < inode->i_sb->s_blocksize - 1 && (c = *(symname++)))
- link[i++] = c;
- link[i] = 0;
- if (name_page) {
- err = obdfs_do_writepage(inode, name_page, IS_SYNC(inode));
- /* XXX handle err */
- PDEBUG(name_page, "symlink");
- UnlockPage(name_page);
- page_cache_release(name_page);
- }
- inode->i_size = i;
- mark_inode_dirty(inode);
-
- page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len,
- &de, &err);
- if (!page)
- goto out_no_entry;
- de->inode = cpu_to_le32(inode->i_ino);
- ext2_set_de_type(dir->i_sb, de, S_IFLNK);
- dir->i_version = ++event;
- err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
- UnlockPage(page);
-
- d_instantiate(dentry, inode);
-out:
- EXIT;
- return err;
-
-out_no_entry:
- inode->i_nlink--;
- mark_inode_dirty(inode);
- iput (inode);
- goto out;
-} /* obdfs_symlink */
-
-int obdfs_link (struct dentry * old_dentry,
- struct inode * dir, struct dentry *dentry)
+static int obdfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
{
- struct inode *inode = old_dentry->d_inode;
- struct ext2_dir_entry_2 * de;
- struct page *page;
- int err;
-
+ struct inode * inode;
+ int err = -EMLINK;
ENTRY;
- if (S_ISDIR(inode->i_mode))
- return -EPERM;
+ if (dir->i_nlink >= EXT2_LINK_MAX)
+ goto out;
- if (inode->i_nlink >= EXT2_LINK_MAX)
- return -EMLINK;
+ ext2_inc_count(dir);
- page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
- if (!page)
- return err;
+ inode = obdfs_new_inode (dir, S_IFDIR | mode);
+ err = PTR_ERR(inode);
+ if (IS_ERR(inode))
+ goto out_dir;
- de->inode = cpu_to_le32(inode->i_ino);
- ext2_set_de_type(dir->i_sb, de, inode->i_mode);
- dir->i_version = ++event;
+ inode->i_op = &obdfs_dir_inode_operations;
+ inode->i_fop = &obdfs_dir_operations;
+ inode->i_mapping->a_ops = &obdfs_aops;
- err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
- UnlockPage(page);
+ ext2_inc_count(inode);
- page_cache_release(page);
- inode->i_nlink++;
- inode->i_ctime = CURRENT_TIME;
- mark_inode_dirty(inode);
- inode->i_count++;
- d_instantiate(dentry, inode);
- return err;
-} /* obdfs_link */
+ err = ext2_make_empty(inode, dir);
+ if (err)
+ goto out_fail;
-#define PARENT_INO(buffer) \
- ((struct ext2_dir_entry_2 *) ((char *) buffer + \
- le16_to_cpu(((struct ext2_dir_entry_2 *) buffer)->rec_len)))->inode
+ err = ext2_add_link(dentry, inode);
+ if (err)
+ goto out_fail;
-/*
- * Anybody can rename anything with this: the permission checks are left to the
- * higher-level routines.
- */
-int obdfs_rename (struct inode * old_dir, struct dentry *old_dentry,
- struct inode * new_dir, struct dentry *new_dentry)
+ 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 * old_inode, * new_inode;
- struct page * old_page, * new_page, * dir_page;
- struct ext2_dir_entry_2 * old_de, * new_de;
- int err;
+ 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;
+}
- ENTRY;
+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;
+}
- new_page = dir_page = NULL;
-
- /* does the old entry exist? - if not get out */
- old_page = obdfs_find_entry (old_dir, old_dentry->d_name.name, old_dentry->d_name.len, &old_de, NOLOCK);
- PDEBUG(old_page, "rename - old page");
- /*
- * Check for inode number is _not_ due to possible IO errors.
- * We might rmdir the source, keep it as pwd of some process
- * and merrily kill the link to whatever was created under the
- * same name. Goodbye sticky bit ;-<
- */
- old_inode = old_dentry->d_inode;
- err = -ENOENT;
- if (!old_page || le32_to_cpu(old_de->inode) != old_inode->i_ino)
- goto end_rename;
-
- /* find new inode */
- new_inode = new_dentry->d_inode;
- new_page = obdfs_find_entry (new_dir, new_dentry->d_name.name,
- new_dentry->d_name.len, &new_de, NOLOCK);
- PDEBUG(new_page, "rename - new page ");
- if (new_page) {
- if (!new_inode) {
- page_cache_release(new_page);
- new_page = NULL;
- } else {
- DQUOT_INIT(new_inode);
- }
- }
- /* in this case we to check more ... */
- if (S_ISDIR(old_inode->i_mode)) {
- /* can only rename into empty new directory */
- if (new_inode) {
- err = -ENOTEMPTY;
- if (!empty_dir (new_inode))
- goto end_rename;
- }
- err = -EIO;
- dir_page= obdfs_getpage (old_inode, 0, 0, LOCKED);
- PDEBUG(dir_page, "rename dir page");
-
- if (!dir_page)
- goto end_rename;
- if (le32_to_cpu(PARENT_INO(page_address(dir_page))) != old_dir->i_ino)
- goto end_rename;
- err = -EMLINK;
- if (!new_inode && new_dir!=old_dir &&
- new_dir->i_nlink >= EXT2_LINK_MAX)
- goto end_rename;
- }
- /* create the target dir entry */
- if (!new_page) {
- new_page = obdfs_add_entry (new_dir, new_dentry->d_name.name,
- new_dentry->d_name.len, &new_de,
- &err);
- PDEBUG(new_page, "rename new page");
- if (!new_page)
- goto end_rename;
- }
- new_dir->i_version = ++event;
-
- /*
- * remove the old entry
- */
- new_de->inode = le32_to_cpu(old_inode->i_ino);
- if (EXT2_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
- EXT2_FEATURE_INCOMPAT_FILETYPE))
- new_de->file_type = old_de->file_type;
-
- obdfs_delete_entry (old_de, old_page);
-
- old_dir->i_version = ++event;
- if (new_inode) {
- new_inode->i_nlink--;
- new_inode->i_ctime = CURRENT_TIME;
- mark_inode_dirty(new_inode);
- }
- old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
- old_dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
- mark_inode_dirty(old_dir);
- if (dir_page) {
- PARENT_INO(page_address(dir_page)) = le32_to_cpu(new_dir->i_ino);
- /* XXX handle err */
- err = obdfs_do_writepage(old_inode, dir_page, IS_SYNC(old_inode));
- old_dir->i_nlink--;
- mark_inode_dirty(old_dir);
- if (new_inode) {
- new_inode->i_nlink--;
- mark_inode_dirty(new_inode);
- } else {
- new_dir->i_nlink++;
- new_dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
- mark_inode_dirty(new_dir);
- }
- }
- if ( old_page != new_page ) {
- unsigned long index = old_page->index;
- /* lock the old_page and release unlocked copy */
- CDEBUG(D_INODE, "old_page at %p\n", old_page);
- page_cache_release(old_page);
- old_page = obdfs_getpage(old_dir, index >> PAGE_SHIFT, 0, LOCKED);
- CDEBUG(D_INODE, "old_page at %p\n", old_page);
- /* XXX handle err */
- err = obdfs_do_writepage(old_dir, old_page, IS_SYNC(old_dir));
- }
-
- err = obdfs_do_writepage(new_dir, new_page, IS_SYNC(new_dir));
-
-end_rename:
- if (old_page && PageLocked(old_page) )
- UnlockPage(old_page);
- if (old_page)
- page_cache_release(old_page);
- if (new_page && PageLocked(new_page) )
- UnlockPage(new_page);
- if (new_page)
- page_cache_release(new_page);
- if (dir_page && PageLocked(dir_page) )
- UnlockPage(dir_page);
- if (dir_page)
- page_cache_release(dir_page);
-
-
- return err;
-} /* obdfs_rename */
+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