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linux/fs/ocfs2/namei.c
Tiger Yang d38eb8db6a ocfs2: implement i_op->permission 
Implement .permission() in ocfs2_file_iops, ocfs2_special_file_iops and
ocfs2_dir_iops.

This helps us avoid some multi-node races with mode change and vfs
operations.

Signed-off-by: Tiger Yang <tiger.yang@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
2006-12-01 18:29:14 -08:00

2316 lines
55 KiB
C
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/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* namei.c
*
* Create and rename file, directory, symlinks
*
* Copyright (C) 2002, 2004 Oracle. All rights reserved.
*
* Portions of this code from linux/fs/ext3/dir.c
*
* 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/minix/dir.c
*
* Copyright (C) 1991, 1992 Linux Torvalds
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#define MLOG_MASK_PREFIX ML_NAMEI
#include <cluster/masklog.h>
#include "ocfs2.h"
#include "alloc.h"
#include "dcache.h"
#include "dir.h"
#include "dlmglue.h"
#include "extent_map.h"
#include "file.h"
#include "inode.h"
#include "journal.h"
#include "namei.h"
#include "suballoc.h"
#include "super.h"
#include "symlink.h"
#include "sysfile.h"
#include "uptodate.h"
#include "vote.h"
#include "buffer_head_io.h"
#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))
static int inline ocfs2_search_dirblock(struct buffer_head *bh,
struct inode *dir,
const char *name, int namelen,
unsigned long offset,
struct ocfs2_dir_entry **res_dir);
static int ocfs2_delete_entry(handle_t *handle,
struct inode *dir,
struct ocfs2_dir_entry *de_del,
struct buffer_head *bh);
static int __ocfs2_add_entry(handle_t *handle,
struct inode *dir,
const char *name, int namelen,
struct inode *inode, u64 blkno,
struct buffer_head *parent_fe_bh,
struct buffer_head *insert_bh);
static int ocfs2_mknod_locked(struct ocfs2_super *osb,
struct inode *dir,
struct dentry *dentry, int mode,
dev_t dev,
struct buffer_head **new_fe_bh,
struct buffer_head *parent_fe_bh,
handle_t *handle,
struct inode **ret_inode,
struct ocfs2_alloc_context *inode_ac);
static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
handle_t *handle,
struct inode *parent,
struct inode *inode,
struct buffer_head *fe_bh,
struct ocfs2_alloc_context *data_ac);
static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
struct inode **ret_orphan_dir,
struct inode *inode,
char *name,
struct buffer_head **de_bh);
static int ocfs2_orphan_add(struct ocfs2_super *osb,
handle_t *handle,
struct inode *inode,
struct ocfs2_dinode *fe,
char *name,
struct buffer_head *de_bh,
struct inode *orphan_dir_inode);
static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
handle_t *handle,
struct inode *inode,
const char *symname);
static inline int ocfs2_add_entry(handle_t *handle,
struct dentry *dentry,
struct inode *inode, u64 blkno,
struct buffer_head *parent_fe_bh,
struct buffer_head *insert_bh)
{
return __ocfs2_add_entry(handle, dentry->d_parent->d_inode,
dentry->d_name.name, dentry->d_name.len,
inode, blkno, parent_fe_bh, insert_bh);
}
/* An orphan dir name is an 8 byte value, printed as a hex string */
#define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
int status;
u64 blkno;
struct buffer_head *dirent_bh = NULL;
struct inode *inode = NULL;
struct dentry *ret;
struct ocfs2_dir_entry *dirent;
struct ocfs2_inode_info *oi;
mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
dentry->d_name.len, dentry->d_name.name);
if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
ret = ERR_PTR(-ENAMETOOLONG);
goto bail;
}
mlog(0, "find name %.*s in directory %llu\n", dentry->d_name.len,
dentry->d_name.name, (unsigned long long)OCFS2_I(dir)->ip_blkno);
status = ocfs2_meta_lock(dir, NULL, 0);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
ret = ERR_PTR(status);
goto bail;
}
status = ocfs2_find_files_on_disk(dentry->d_name.name,
dentry->d_name.len, &blkno,
dir, &dirent_bh, &dirent);
if (status < 0)
goto bail_add;
inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0);
if (IS_ERR(inode)) {
mlog(ML_ERROR, "Unable to create inode %llu\n",
(unsigned long long)blkno);
ret = ERR_PTR(-EACCES);
goto bail_unlock;
}
oi = OCFS2_I(inode);
/* Clear any orphaned state... If we were able to look up the
* inode from a directory, it certainly can't be orphaned. We
* might have the bad state from a node which intended to
* orphan this inode but crashed before it could commit the
* unlink. */
spin_lock(&oi->ip_lock);
oi->ip_flags &= ~OCFS2_INODE_MAYBE_ORPHANED;
oi->ip_orphaned_slot = OCFS2_INVALID_SLOT;
spin_unlock(&oi->ip_lock);
bail_add:
dentry->d_op = &ocfs2_dentry_ops;
ret = d_splice_alias(inode, dentry);
if (inode) {
/*
* If d_splice_alias() finds a DCACHE_DISCONNECTED
* dentry, it will d_move() it on top of ourse. The
* return value will indicate this however, so in
* those cases, we switch them around for the locking
* code.
*
* NOTE: This dentry already has ->d_op set from
* ocfs2_get_parent() and ocfs2_get_dentry()
*/
if (ret)
dentry = ret;
status = ocfs2_dentry_attach_lock(dentry, inode,
OCFS2_I(dir)->ip_blkno);
if (status) {
mlog_errno(status);
ret = ERR_PTR(status);
goto bail_unlock;
}
}
bail_unlock:
/* Don't drop the cluster lock until *after* the d_add --
* unlink on another node will message us to remove that
* dentry under this lock so otherwise we can race this with
* the vote thread and have a stale dentry. */
ocfs2_meta_unlock(dir, 0);
bail:
if (dirent_bh)
brelse(dirent_bh);
mlog_exit_ptr(ret);
return ret;
}
static int ocfs2_fill_new_dir(struct ocfs2_super *osb,
handle_t *handle,
struct inode *parent,
struct inode *inode,
struct buffer_head *fe_bh,
struct ocfs2_alloc_context *data_ac)
{
int status;
struct buffer_head *new_bh = NULL;
struct ocfs2_dir_entry *de = NULL;
mlog_entry_void();
status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
data_ac, NULL, &new_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
ocfs2_set_new_buffer_uptodate(inode, new_bh);
status = ocfs2_journal_access(handle, inode, new_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (status < 0) {
mlog_errno(status);
goto bail;
}
memset(new_bh->b_data, 0, osb->sb->s_blocksize);
de = (struct ocfs2_dir_entry *) new_bh->b_data;
de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
de->name_len = 1;
de->rec_len =
cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
strcpy(de->name, ".");
ocfs2_set_de_type(de, S_IFDIR);
de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len));
de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno);
de->rec_len = cpu_to_le16(inode->i_sb->s_blocksize -
OCFS2_DIR_REC_LEN(1));
de->name_len = 2;
strcpy(de->name, "..");
ocfs2_set_de_type(de, S_IFDIR);
status = ocfs2_journal_dirty(handle, new_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
i_size_write(inode, inode->i_sb->s_blocksize);
inode->i_nlink = 2;
inode->i_blocks = ocfs2_align_bytes_to_sectors(inode->i_sb->s_blocksize);
status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
status = 0;
bail:
if (new_bh)
brelse(new_bh);
mlog_exit(status);
return status;
}
static int ocfs2_mknod(struct inode *dir,
struct dentry *dentry,
int mode,
dev_t dev)
{
int status = 0;
struct buffer_head *parent_fe_bh = NULL;
handle_t *handle = NULL;
struct ocfs2_super *osb;
struct ocfs2_dinode *dirfe;
struct buffer_head *new_fe_bh = NULL;
struct buffer_head *de_bh = NULL;
struct inode *inode = NULL;
struct ocfs2_alloc_context *inode_ac = NULL;
struct ocfs2_alloc_context *data_ac = NULL;
mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
(unsigned long)dev, dentry->d_name.len,
dentry->d_name.name);
/* get our super block */
osb = OCFS2_SB(dir->i_sb);
status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
return status;
}
if (S_ISDIR(mode) && (dir->i_nlink >= OCFS2_LINK_MAX)) {
status = -EMLINK;
goto leave;
}
dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
if (!dirfe->i_links_count) {
/* can't make a file in a deleted directory. */
status = -ENOENT;
goto leave;
}
status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
dentry->d_name.len);
if (status)
goto leave;
/* get a spot inside the dir. */
status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
dentry->d_name.name,
dentry->d_name.len, &de_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
/* reserve an inode spot */
status = ocfs2_reserve_new_inode(osb, &inode_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
goto leave;
}
/* are we making a directory? If so, reserve a cluster for his
* 1st extent. */
if (S_ISDIR(mode)) {
status = ocfs2_reserve_clusters(osb, 1, &data_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
goto leave;
}
}
handle = ocfs2_start_trans(osb, OCFS2_MKNOD_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status);
goto leave;
}
/* do the real work now. */
status = ocfs2_mknod_locked(osb, dir, dentry, mode, dev,
&new_fe_bh, parent_fe_bh, handle,
&inode, inode_ac);
if (status < 0) {
mlog_errno(status);
goto leave;
}
if (S_ISDIR(mode)) {
status = ocfs2_fill_new_dir(osb, handle, dir, inode,
new_fe_bh, data_ac);
if (status < 0) {
mlog_errno(status);
goto leave;
}
status = ocfs2_journal_access(handle, dir, parent_fe_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto leave;
}
le16_add_cpu(&dirfe->i_links_count, 1);
status = ocfs2_journal_dirty(handle, parent_fe_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
inc_nlink(dir);
}
status = ocfs2_add_entry(handle, dentry, inode,
OCFS2_I(inode)->ip_blkno, parent_fe_bh,
de_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
status = ocfs2_dentry_attach_lock(dentry, inode,
OCFS2_I(dir)->ip_blkno);
if (status) {
mlog_errno(status);
goto leave;
}
insert_inode_hash(inode);
dentry->d_op = &ocfs2_dentry_ops;
d_instantiate(dentry, inode);
status = 0;
leave:
if (handle)
ocfs2_commit_trans(osb, handle);
ocfs2_meta_unlock(dir, 1);
if (status == -ENOSPC)
mlog(0, "Disk is full\n");
if (new_fe_bh)
brelse(new_fe_bh);
if (de_bh)
brelse(de_bh);
if (parent_fe_bh)
brelse(parent_fe_bh);
if ((status < 0) && inode)
iput(inode);
if (inode_ac)
ocfs2_free_alloc_context(inode_ac);
if (data_ac)
ocfs2_free_alloc_context(data_ac);
mlog_exit(status);
return status;
}
static int ocfs2_mknod_locked(struct ocfs2_super *osb,
struct inode *dir,
struct dentry *dentry, int mode,
dev_t dev,
struct buffer_head **new_fe_bh,
struct buffer_head *parent_fe_bh,
handle_t *handle,
struct inode **ret_inode,
struct ocfs2_alloc_context *inode_ac)
{
int status = 0;
struct ocfs2_dinode *fe = NULL;
struct ocfs2_extent_list *fel;
u64 fe_blkno = 0;
u16 suballoc_bit;
struct inode *inode = NULL;
mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
(unsigned long)dev, dentry->d_name.len,
dentry->d_name.name);
*new_fe_bh = NULL;
*ret_inode = NULL;
status = ocfs2_claim_new_inode(osb, handle, inode_ac, &suballoc_bit,
&fe_blkno);
if (status < 0) {
mlog_errno(status);
goto leave;
}
inode = new_inode(dir->i_sb);
if (IS_ERR(inode)) {
status = PTR_ERR(inode);
mlog(ML_ERROR, "new_inode failed!\n");
goto leave;
}
/* populate as many fields early on as possible - many of
* these are used by the support functions here and in
* callers. */
inode->i_ino = ino_from_blkno(osb->sb, fe_blkno);
OCFS2_I(inode)->ip_blkno = fe_blkno;
if (S_ISDIR(mode))
inode->i_nlink = 2;
else
inode->i_nlink = 1;
inode->i_mode = mode;
spin_lock(&osb->osb_lock);
inode->i_generation = osb->s_next_generation++;
spin_unlock(&osb->osb_lock);
*new_fe_bh = sb_getblk(osb->sb, fe_blkno);
if (!*new_fe_bh) {
status = -EIO;
mlog_errno(status);
goto leave;
}
ocfs2_set_new_buffer_uptodate(inode, *new_fe_bh);
status = ocfs2_journal_access(handle, inode, *new_fe_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (status < 0) {
mlog_errno(status);
goto leave;
}
fe = (struct ocfs2_dinode *) (*new_fe_bh)->b_data;
memset(fe, 0, osb->sb->s_blocksize);
fe->i_generation = cpu_to_le32(inode->i_generation);
fe->i_fs_generation = cpu_to_le32(osb->fs_generation);
fe->i_blkno = cpu_to_le64(fe_blkno);
fe->i_suballoc_bit = cpu_to_le16(suballoc_bit);
fe->i_suballoc_slot = cpu_to_le16(osb->slot_num);
fe->i_uid = cpu_to_le32(current->fsuid);
if (dir->i_mode & S_ISGID) {
fe->i_gid = cpu_to_le32(dir->i_gid);
if (S_ISDIR(mode))
mode |= S_ISGID;
} else
fe->i_gid = cpu_to_le32(current->fsgid);
fe->i_mode = cpu_to_le16(mode);
if (S_ISCHR(mode) || S_ISBLK(mode))
fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
fe->i_links_count = cpu_to_le16(inode->i_nlink);
fe->i_last_eb_blk = 0;
strcpy(fe->i_signature, OCFS2_INODE_SIGNATURE);
le32_add_cpu(&fe->i_flags, OCFS2_VALID_FL);
fe->i_atime = fe->i_ctime = fe->i_mtime =
cpu_to_le64(CURRENT_TIME.tv_sec);
fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
cpu_to_le32(CURRENT_TIME.tv_nsec);
fe->i_dtime = 0;
fel = &fe->id2.i_list;
fel->l_tree_depth = 0;
fel->l_next_free_rec = 0;
fel->l_count = cpu_to_le16(ocfs2_extent_recs_per_inode(osb->sb));
status = ocfs2_journal_dirty(handle, *new_fe_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
if (ocfs2_populate_inode(inode, fe, 1) < 0) {
mlog(ML_ERROR, "populate inode failed! bh->b_blocknr=%llu, "
"i_blkno=%llu, i_ino=%lu\n",
(unsigned long long) (*new_fe_bh)->b_blocknr,
(unsigned long long)fe->i_blkno, inode->i_ino);
BUG();
}
ocfs2_inode_set_new(osb, inode);
status = ocfs2_create_new_inode_locks(inode);
if (status < 0)
mlog_errno(status);
status = 0; /* error in ocfs2_create_new_inode_locks is not
* critical */
*ret_inode = inode;
leave:
if (status < 0) {
if (*new_fe_bh) {
brelse(*new_fe_bh);
*new_fe_bh = NULL;
}
if (inode)
iput(inode);
}
mlog_exit(status);
return status;
}
static int ocfs2_mkdir(struct inode *dir,
struct dentry *dentry,
int mode)
{
int ret;
mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
dentry->d_name.len, dentry->d_name.name);
ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
mlog_exit(ret);
return ret;
}
static int ocfs2_create(struct inode *dir,
struct dentry *dentry,
int mode,
struct nameidata *nd)
{
int ret;
mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry, mode,
dentry->d_name.len, dentry->d_name.name);
ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
mlog_exit(ret);
return ret;
}
static int ocfs2_link(struct dentry *old_dentry,
struct inode *dir,
struct dentry *dentry)
{
handle_t *handle;
struct inode *inode = old_dentry->d_inode;
int err;
struct buffer_head *fe_bh = NULL;
struct buffer_head *parent_fe_bh = NULL;
struct buffer_head *de_bh = NULL;
struct ocfs2_dinode *fe = NULL;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
old_dentry->d_name.len, old_dentry->d_name.name,
dentry->d_name.len, dentry->d_name.name);
if (S_ISDIR(inode->i_mode))
return -EPERM;
err = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
if (err < 0) {
if (err != -ENOENT)
mlog_errno(err);
return err;
}
if (!dir->i_nlink) {
err = -ENOENT;
goto out;
}
err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
dentry->d_name.len);
if (err)
goto out;
err = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
dentry->d_name.name,
dentry->d_name.len, &de_bh);
if (err < 0) {
mlog_errno(err);
goto out;
}
err = ocfs2_meta_lock(inode, &fe_bh, 1);
if (err < 0) {
if (err != -ENOENT)
mlog_errno(err);
goto out;
}
fe = (struct ocfs2_dinode *) fe_bh->b_data;
if (le16_to_cpu(fe->i_links_count) >= OCFS2_LINK_MAX) {
err = -EMLINK;
goto out_unlock_inode;
}
handle = ocfs2_start_trans(osb, OCFS2_LINK_CREDITS);
if (IS_ERR(handle)) {
err = PTR_ERR(handle);
handle = NULL;
mlog_errno(err);
goto out_unlock_inode;
}
err = ocfs2_journal_access(handle, inode, fe_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (err < 0) {
mlog_errno(err);
goto out_commit;
}
inc_nlink(inode);
inode->i_ctime = CURRENT_TIME;
fe->i_links_count = cpu_to_le16(inode->i_nlink);
fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
err = ocfs2_journal_dirty(handle, fe_bh);
if (err < 0) {
le16_add_cpu(&fe->i_links_count, -1);
drop_nlink(inode);
mlog_errno(err);
goto out_commit;
}
err = ocfs2_add_entry(handle, dentry, inode,
OCFS2_I(inode)->ip_blkno,
parent_fe_bh, de_bh);
if (err) {
le16_add_cpu(&fe->i_links_count, -1);
drop_nlink(inode);
mlog_errno(err);
goto out_commit;
}
err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
if (err) {
mlog_errno(err);
goto out_commit;
}
atomic_inc(&inode->i_count);
dentry->d_op = &ocfs2_dentry_ops;
d_instantiate(dentry, inode);
out_commit:
ocfs2_commit_trans(osb, handle);
out_unlock_inode:
ocfs2_meta_unlock(inode, 1);
out:
ocfs2_meta_unlock(dir, 1);
if (de_bh)
brelse(de_bh);
if (fe_bh)
brelse(fe_bh);
if (parent_fe_bh)
brelse(parent_fe_bh);
mlog_exit(err);
return err;
}
/*
* Takes and drops an exclusive lock on the given dentry. This will
* force other nodes to drop it.
*/
static int ocfs2_remote_dentry_delete(struct dentry *dentry)
{
int ret;
ret = ocfs2_dentry_lock(dentry, 1);
if (ret)
mlog_errno(ret);
else
ocfs2_dentry_unlock(dentry, 1);
return ret;
}
static inline int inode_is_unlinkable(struct inode *inode)
{
if (S_ISDIR(inode->i_mode)) {
if (inode->i_nlink == 2)
return 1;
return 0;
}
if (inode->i_nlink == 1)
return 1;
return 0;
}
static int ocfs2_unlink(struct inode *dir,
struct dentry *dentry)
{
int status;
int child_locked = 0;
struct inode *inode = dentry->d_inode;
struct inode *orphan_dir = NULL;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
u64 blkno;
struct ocfs2_dinode *fe = NULL;
struct buffer_head *fe_bh = NULL;
struct buffer_head *parent_node_bh = NULL;
handle_t *handle = NULL;
struct ocfs2_dir_entry *dirent = NULL;
struct buffer_head *dirent_bh = NULL;
char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
struct buffer_head *orphan_entry_bh = NULL;
mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
dentry->d_name.len, dentry->d_name.name);
BUG_ON(dentry->d_parent->d_inode != dir);
mlog(0, "ino = %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
if (inode == osb->root_inode) {
mlog(0, "Cannot delete the root directory\n");
return -EPERM;
}
status = ocfs2_meta_lock(dir, &parent_node_bh, 1);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
return status;
}
status = ocfs2_find_files_on_disk(dentry->d_name.name,
dentry->d_name.len, &blkno,
dir, &dirent_bh, &dirent);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
goto leave;
}
if (OCFS2_I(inode)->ip_blkno != blkno) {
status = -ENOENT;
mlog(0, "ip_blkno %llu != dirent blkno %llu ip_flags = %x\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno,
(unsigned long long)blkno, OCFS2_I(inode)->ip_flags);
goto leave;
}
status = ocfs2_meta_lock(inode, &fe_bh, 1);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
goto leave;
}
child_locked = 1;
if (S_ISDIR(inode->i_mode)) {
if (!ocfs2_empty_dir(inode)) {
status = -ENOTEMPTY;
goto leave;
} else if (inode->i_nlink != 2) {
status = -ENOTEMPTY;
goto leave;
}
}
status = ocfs2_remote_dentry_delete(dentry);
if (status < 0) {
/* This vote should succeed under all normal
* circumstances. */
mlog_errno(status);
goto leave;
}
if (inode_is_unlinkable(inode)) {
status = ocfs2_prepare_orphan_dir(osb, &orphan_dir, inode,
orphan_name,
&orphan_entry_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
}
handle = ocfs2_start_trans(osb, OCFS2_UNLINK_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status);
goto leave;
}
status = ocfs2_journal_access(handle, inode, fe_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto leave;
}
fe = (struct ocfs2_dinode *) fe_bh->b_data;
if (inode_is_unlinkable(inode)) {
status = ocfs2_orphan_add(osb, handle, inode, fe, orphan_name,
orphan_entry_bh, orphan_dir);
if (status < 0) {
mlog_errno(status);
goto leave;
}
}
/* delete the name from the parent dir */
status = ocfs2_delete_entry(handle, dir, dirent, dirent_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
if (S_ISDIR(inode->i_mode))
drop_nlink(inode);
drop_nlink(inode);
fe->i_links_count = cpu_to_le16(inode->i_nlink);
status = ocfs2_journal_dirty(handle, fe_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
if (S_ISDIR(inode->i_mode)) {
drop_nlink(dir);
status = ocfs2_mark_inode_dirty(handle, dir,
parent_node_bh);
if (status < 0) {
mlog_errno(status);
inc_nlink(dir);
}
}
leave:
if (handle)
ocfs2_commit_trans(osb, handle);
if (child_locked)
ocfs2_meta_unlock(inode, 1);
ocfs2_meta_unlock(dir, 1);
if (orphan_dir) {
/* This was locked for us in ocfs2_prepare_orphan_dir() */
ocfs2_meta_unlock(orphan_dir, 1);
mutex_unlock(&orphan_dir->i_mutex);
iput(orphan_dir);
}
if (fe_bh)
brelse(fe_bh);
if (dirent_bh)
brelse(dirent_bh);
if (parent_node_bh)
brelse(parent_node_bh);
if (orphan_entry_bh)
brelse(orphan_entry_bh);
mlog_exit(status);
return status;
}
/*
* The only place this should be used is rename!
* if they have the same id, then the 1st one is the only one locked.
*/
static int ocfs2_double_lock(struct ocfs2_super *osb,
struct buffer_head **bh1,
struct inode *inode1,
struct buffer_head **bh2,
struct inode *inode2)
{
int status;
struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
struct buffer_head **tmpbh;
struct inode *tmpinode;
mlog_entry("(inode1 = %llu, inode2 = %llu)\n",
(unsigned long long)oi1->ip_blkno,
(unsigned long long)oi2->ip_blkno);
if (*bh1)
*bh1 = NULL;
if (*bh2)
*bh2 = NULL;
/* we always want to lock the one with the lower lockid first. */
if (oi1->ip_blkno != oi2->ip_blkno) {
if (oi1->ip_blkno < oi2->ip_blkno) {
/* switch id1 and id2 around */
mlog(0, "switching them around...\n");
tmpbh = bh2;
bh2 = bh1;
bh1 = tmpbh;
tmpinode = inode2;
inode2 = inode1;
inode1 = tmpinode;
}
/* lock id2 */
status = ocfs2_meta_lock(inode2, bh2, 1);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
goto bail;
}
}
/* lock id1 */
status = ocfs2_meta_lock(inode1, bh1, 1);
if (status < 0) {
/*
* An error return must mean that no cluster locks
* were held on function exit.
*/
if (oi1->ip_blkno != oi2->ip_blkno)
ocfs2_meta_unlock(inode2, 1);
if (status != -ENOENT)
mlog_errno(status);
}
bail:
mlog_exit(status);
return status;
}
static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2)
{
ocfs2_meta_unlock(inode1, 1);
if (inode1 != inode2)
ocfs2_meta_unlock(inode2, 1);
}
#define PARENT_INO(buffer) \
((struct ocfs2_dir_entry *) \
((char *)buffer + \
le16_to_cpu(((struct ocfs2_dir_entry *)buffer)->rec_len)))->inode
static int ocfs2_rename(struct inode *old_dir,
struct dentry *old_dentry,
struct inode *new_dir,
struct dentry *new_dentry)
{
int status = 0, rename_lock = 0, parents_locked = 0;
int old_child_locked = 0, new_child_locked = 0;
struct inode *old_inode = old_dentry->d_inode;
struct inode *new_inode = new_dentry->d_inode;
struct inode *orphan_dir = NULL;
struct ocfs2_dinode *newfe = NULL;
char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
struct buffer_head *orphan_entry_bh = NULL;
struct buffer_head *newfe_bh = NULL;
struct buffer_head *insert_entry_bh = NULL;
struct ocfs2_super *osb = NULL;
u64 newfe_blkno;
handle_t *handle = NULL;
struct buffer_head *old_dir_bh = NULL;
struct buffer_head *new_dir_bh = NULL;
struct ocfs2_dir_entry *old_de = NULL, *new_de = NULL; // dirent for old_dentry
// and new_dentry
struct buffer_head *new_de_bh = NULL, *old_de_bh = NULL; // bhs for above
struct buffer_head *old_inode_de_bh = NULL; // if old_dentry is a dir,
// this is the 1st dirent bh
nlink_t old_dir_nlink = old_dir->i_nlink, new_dir_nlink = new_dir->i_nlink;
/* At some point it might be nice to break this function up a
* bit. */
mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p, from='%.*s' to='%.*s')\n",
old_dir, old_dentry, new_dir, new_dentry,
old_dentry->d_name.len, old_dentry->d_name.name,
new_dentry->d_name.len, new_dentry->d_name.name);
osb = OCFS2_SB(old_dir->i_sb);
if (new_inode) {
if (!igrab(new_inode))
BUG();
}
/* Assume a directory heirarchy thusly:
* a/b/c
* a/d
* a,b,c, and d are all directories.
*
* from cwd of 'a' on both nodes:
* node1: mv b/c d
* node2: mv d b/c
*
* And that's why, just like the VFS, we need a file system
* rename lock. */
if (old_dentry != new_dentry) {
status = ocfs2_rename_lock(osb);
if (status < 0) {
mlog_errno(status);
goto bail;
}
rename_lock = 1;
}
/* if old and new are the same, this'll just do one lock. */
status = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
&new_dir_bh, new_dir);
if (status < 0) {
mlog_errno(status);
goto bail;
}
parents_locked = 1;
/* make sure both dirs have bhs
* get an extra ref on old_dir_bh if old==new */
if (!new_dir_bh) {
if (old_dir_bh) {
new_dir_bh = old_dir_bh;
get_bh(new_dir_bh);
} else {
mlog(ML_ERROR, "no old_dir_bh!\n");
status = -EIO;
goto bail;
}
}
/*
* Though we don't require an inode meta data update if
* old_inode is not a directory, we lock anyway here to ensure
* the vote thread on other nodes won't have to concurrently
* downconvert the inode and the dentry locks.
*/
status = ocfs2_meta_lock(old_inode, NULL, 1);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
goto bail;
}
old_child_locked = 1;
status = ocfs2_remote_dentry_delete(old_dentry);
if (status < 0) {
mlog_errno(status);
goto bail;
}
if (S_ISDIR(old_inode->i_mode)) {
status = -EIO;
old_inode_de_bh = ocfs2_bread(old_inode, 0, &status, 0);
if (!old_inode_de_bh)
goto bail;
status = -EIO;
if (le64_to_cpu(PARENT_INO(old_inode_de_bh->b_data)) !=
OCFS2_I(old_dir)->ip_blkno)
goto bail;
status = -EMLINK;
if (!new_inode && new_dir!=old_dir &&
new_dir->i_nlink >= OCFS2_LINK_MAX)
goto bail;
}
status = -ENOENT;
old_de_bh = ocfs2_find_entry(old_dentry->d_name.name,
old_dentry->d_name.len,
old_dir, &old_de);
if (!old_de_bh)
goto bail;
/*
* 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 ;-<
*/
if (le64_to_cpu(old_de->inode) != OCFS2_I(old_inode)->ip_blkno)
goto bail;
/* check if the target already exists (in which case we need
* to delete it */
status = ocfs2_find_files_on_disk(new_dentry->d_name.name,
new_dentry->d_name.len,
&newfe_blkno, new_dir, &new_de_bh,
&new_de);
/* The only error we allow here is -ENOENT because the new
* file not existing is perfectly valid. */
if ((status < 0) && (status != -ENOENT)) {
/* If we cannot find the file specified we should just */
/* return the error... */
mlog_errno(status);
goto bail;
}
if (!new_de && new_inode)
mlog(ML_ERROR, "inode %lu does not exist in it's parent "
"directory!", new_inode->i_ino);
/* In case we need to overwrite an existing file, we blow it
* away first */
if (new_de) {
/* VFS didn't think there existed an inode here, but
* someone else in the cluster must have raced our
* rename to create one. Today we error cleanly, in
* the future we should consider calling iget to build
* a new struct inode for this entry. */
if (!new_inode) {
status = -EACCES;
mlog(0, "We found an inode for name %.*s but VFS "
"didn't give us one.\n", new_dentry->d_name.len,
new_dentry->d_name.name);
goto bail;
}
if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
status = -EACCES;
mlog(0, "Inode %llu and dir %llu disagree. flags = %x\n",
(unsigned long long)OCFS2_I(new_inode)->ip_blkno,
(unsigned long long)newfe_blkno,
OCFS2_I(new_inode)->ip_flags);
goto bail;
}
status = ocfs2_meta_lock(new_inode, &newfe_bh, 1);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
goto bail;
}
new_child_locked = 1;
status = ocfs2_remote_dentry_delete(new_dentry);
if (status < 0) {
mlog_errno(status);
goto bail;
}
newfe = (struct ocfs2_dinode *) newfe_bh->b_data;
mlog(0, "aha rename over existing... new_de=%p new_blkno=%llu "
"newfebh=%p bhblocknr=%llu\n", new_de,
(unsigned long long)newfe_blkno, newfe_bh, newfe_bh ?
(unsigned long long)newfe_bh->b_blocknr : 0ULL);
if (S_ISDIR(new_inode->i_mode) || (new_inode->i_nlink == 1)) {
status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
new_inode,
orphan_name,
&orphan_entry_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
}
} else {
BUG_ON(new_dentry->d_parent->d_inode != new_dir);
status = ocfs2_check_dir_for_entry(new_dir,
new_dentry->d_name.name,
new_dentry->d_name.len);
if (status)
goto bail;
status = ocfs2_prepare_dir_for_insert(osb, new_dir, new_dir_bh,
new_dentry->d_name.name,
new_dentry->d_name.len,
&insert_entry_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
}
handle = ocfs2_start_trans(osb, OCFS2_RENAME_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status);
goto bail;
}
if (new_de) {
if (S_ISDIR(new_inode->i_mode)) {
if (!ocfs2_empty_dir(new_inode) ||
new_inode->i_nlink != 2) {
status = -ENOTEMPTY;
goto bail;
}
}
status = ocfs2_journal_access(handle, new_inode, newfe_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto bail;
}
if (S_ISDIR(new_inode->i_mode) ||
(newfe->i_links_count == cpu_to_le16(1))){
status = ocfs2_orphan_add(osb, handle, new_inode,
newfe, orphan_name,
orphan_entry_bh, orphan_dir);
if (status < 0) {
mlog_errno(status);
goto bail;
}
}
/* change the dirent to point to the correct inode */
status = ocfs2_journal_access(handle, new_dir, new_de_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto bail;
}
new_de->inode = cpu_to_le64(OCFS2_I(old_inode)->ip_blkno);
new_de->file_type = old_de->file_type;
new_dir->i_version++;
status = ocfs2_journal_dirty(handle, new_de_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
if (S_ISDIR(new_inode->i_mode))
newfe->i_links_count = 0;
else
le16_add_cpu(&newfe->i_links_count, -1);
status = ocfs2_journal_dirty(handle, newfe_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
} else {
/* if the name was not found in new_dir, add it now */
status = ocfs2_add_entry(handle, new_dentry, old_inode,
OCFS2_I(old_inode)->ip_blkno,
new_dir_bh, insert_entry_bh);
}
old_inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(old_inode);
/* now that the name has been added to new_dir, remove the old name */
status = ocfs2_delete_entry(handle, old_dir, old_de, old_de_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
if (new_inode) {
new_inode->i_nlink--;
new_inode->i_ctime = CURRENT_TIME;
}
old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
if (old_inode_de_bh) {
status = ocfs2_journal_access(handle, old_inode,
old_inode_de_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
PARENT_INO(old_inode_de_bh->b_data) =
cpu_to_le64(OCFS2_I(new_dir)->ip_blkno);
status = ocfs2_journal_dirty(handle, old_inode_de_bh);
old_dir->i_nlink--;
if (new_inode) {
new_inode->i_nlink--;
} else {
inc_nlink(new_dir);
mark_inode_dirty(new_dir);
}
}
mark_inode_dirty(old_dir);
if (new_inode)
mark_inode_dirty(new_inode);
if (old_dir != new_dir)
if (new_dir_nlink != new_dir->i_nlink) {
if (!new_dir_bh) {
mlog(ML_ERROR, "need to change nlink for new "
"dir %llu from %d to %d but bh is NULL\n",
(unsigned long long)OCFS2_I(new_dir)->ip_blkno,
(int)new_dir_nlink, new_dir->i_nlink);
} else {
struct ocfs2_dinode *fe;
status = ocfs2_journal_access(handle,
new_dir,
new_dir_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
fe = (struct ocfs2_dinode *) new_dir_bh->b_data;
fe->i_links_count = cpu_to_le16(new_dir->i_nlink);
status = ocfs2_journal_dirty(handle, new_dir_bh);
}
}
if (old_dir_nlink != old_dir->i_nlink) {
if (!old_dir_bh) {
mlog(ML_ERROR, "need to change nlink for old dir "
"%llu from %d to %d but bh is NULL!\n",
(unsigned long long)OCFS2_I(old_dir)->ip_blkno,
(int)old_dir_nlink, old_dir->i_nlink);
} else {
struct ocfs2_dinode *fe;
status = ocfs2_journal_access(handle, old_dir,
old_dir_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
fe->i_links_count = cpu_to_le16(old_dir->i_nlink);
status = ocfs2_journal_dirty(handle, old_dir_bh);
}
}
ocfs2_dentry_move(old_dentry, new_dentry, old_dir, new_dir);
status = 0;
bail:
if (rename_lock)
ocfs2_rename_unlock(osb);
if (handle)
ocfs2_commit_trans(osb, handle);
if (parents_locked)
ocfs2_double_unlock(old_dir, new_dir);
if (old_child_locked)
ocfs2_meta_unlock(old_inode, 1);
if (new_child_locked)
ocfs2_meta_unlock(new_inode, 1);
if (orphan_dir) {
/* This was locked for us in ocfs2_prepare_orphan_dir() */
ocfs2_meta_unlock(orphan_dir, 1);
mutex_unlock(&orphan_dir->i_mutex);
iput(orphan_dir);
}
if (new_inode)
sync_mapping_buffers(old_inode->i_mapping);
if (new_inode)
iput(new_inode);
if (newfe_bh)
brelse(newfe_bh);
if (old_dir_bh)
brelse(old_dir_bh);
if (new_dir_bh)
brelse(new_dir_bh);
if (new_de_bh)
brelse(new_de_bh);
if (old_de_bh)
brelse(old_de_bh);
if (old_inode_de_bh)
brelse(old_inode_de_bh);
if (orphan_entry_bh)
brelse(orphan_entry_bh);
if (insert_entry_bh)
brelse(insert_entry_bh);
mlog_exit(status);
return status;
}
/*
* we expect i_size = strlen(symname). Copy symname into the file
* data, including the null terminator.
*/
static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
handle_t *handle,
struct inode *inode,
const char *symname)
{
struct buffer_head **bhs = NULL;
const char *c;
struct super_block *sb = osb->sb;
u64 p_blkno;
int p_blocks;
int virtual, blocks, status, i, bytes_left;
bytes_left = i_size_read(inode) + 1;
/* we can't trust i_blocks because we're actually going to
* write i_size + 1 bytes. */
blocks = (bytes_left + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
mlog_entry("i_blocks = %llu, i_size = %llu, blocks = %d\n",
(unsigned long long)inode->i_blocks,
i_size_read(inode), blocks);
/* Sanity check -- make sure we're going to fit. */
if (bytes_left >
ocfs2_clusters_to_bytes(sb, OCFS2_I(inode)->ip_clusters)) {
status = -EIO;
mlog_errno(status);
goto bail;
}
bhs = kcalloc(blocks, sizeof(struct buffer_head *), GFP_KERNEL);
if (!bhs) {
status = -ENOMEM;
mlog_errno(status);
goto bail;
}
status = ocfs2_extent_map_get_blocks(inode, 0, 1, &p_blkno,
&p_blocks);
if (status < 0) {
mlog_errno(status);
goto bail;
}
/* links can never be larger than one cluster so we know this
* is all going to be contiguous, but do a sanity check
* anyway. */
if ((p_blocks << sb->s_blocksize_bits) < bytes_left) {
status = -EIO;
mlog_errno(status);
goto bail;
}
virtual = 0;
while(bytes_left > 0) {
c = &symname[virtual * sb->s_blocksize];
bhs[virtual] = sb_getblk(sb, p_blkno);
if (!bhs[virtual]) {
status = -ENOMEM;
mlog_errno(status);
goto bail;
}
ocfs2_set_new_buffer_uptodate(inode, bhs[virtual]);
status = ocfs2_journal_access(handle, inode, bhs[virtual],
OCFS2_JOURNAL_ACCESS_CREATE);
if (status < 0) {
mlog_errno(status);
goto bail;
}
memset(bhs[virtual]->b_data, 0, sb->s_blocksize);
memcpy(bhs[virtual]->b_data, c,
(bytes_left > sb->s_blocksize) ? sb->s_blocksize :
bytes_left);
status = ocfs2_journal_dirty(handle, bhs[virtual]);
if (status < 0) {
mlog_errno(status);
goto bail;
}
virtual++;
p_blkno++;
bytes_left -= sb->s_blocksize;
}
status = 0;
bail:
if (bhs) {
for(i = 0; i < blocks; i++)
if (bhs[i])
brelse(bhs[i]);
kfree(bhs);
}
mlog_exit(status);
return status;
}
static int ocfs2_symlink(struct inode *dir,
struct dentry *dentry,
const char *symname)
{
int status, l, credits;
u64 newsize;
struct ocfs2_super *osb = NULL;
struct inode *inode = NULL;
struct super_block *sb;
struct buffer_head *new_fe_bh = NULL;
struct buffer_head *de_bh = NULL;
struct buffer_head *parent_fe_bh = NULL;
struct ocfs2_dinode *fe = NULL;
struct ocfs2_dinode *dirfe;
handle_t *handle = NULL;
struct ocfs2_alloc_context *inode_ac = NULL;
struct ocfs2_alloc_context *data_ac = NULL;
mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
dentry, symname, dentry->d_name.len, dentry->d_name.name);
sb = dir->i_sb;
osb = OCFS2_SB(sb);
l = strlen(symname) + 1;
credits = ocfs2_calc_symlink_credits(sb);
/* lock the parent directory */
status = ocfs2_meta_lock(dir, &parent_fe_bh, 1);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
return status;
}
dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
if (!dirfe->i_links_count) {
/* can't make a file in a deleted directory. */
status = -ENOENT;
goto bail;
}
status = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
dentry->d_name.len);
if (status)
goto bail;
status = ocfs2_prepare_dir_for_insert(osb, dir, parent_fe_bh,
dentry->d_name.name,
dentry->d_name.len, &de_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
status = ocfs2_reserve_new_inode(osb, &inode_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
goto bail;
}
/* don't reserve bitmap space for fast symlinks. */
if (l > ocfs2_fast_symlink_chars(sb)) {
status = ocfs2_reserve_clusters(osb, 1, &data_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
goto bail;
}
}
handle = ocfs2_start_trans(osb, credits);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status);
goto bail;
}
status = ocfs2_mknod_locked(osb, dir, dentry,
S_IFLNK | S_IRWXUGO, 0,
&new_fe_bh, parent_fe_bh, handle,
&inode, inode_ac);
if (status < 0) {
mlog_errno(status);
goto bail;
}
fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
inode->i_rdev = 0;
newsize = l - 1;
if (l > ocfs2_fast_symlink_chars(sb)) {
inode->i_op = &ocfs2_symlink_inode_operations;
status = ocfs2_do_extend_allocation(osb, inode, 1, new_fe_bh,
handle, data_ac, NULL,
NULL);
if (status < 0) {
if (status != -ENOSPC && status != -EINTR) {
mlog(ML_ERROR,
"Failed to extend file to %llu\n",
(unsigned long long)newsize);
mlog_errno(status);
status = -ENOSPC;
}
goto bail;
}
i_size_write(inode, newsize);
inode->i_blocks = ocfs2_align_bytes_to_sectors(newsize);
} else {
inode->i_op = &ocfs2_fast_symlink_inode_operations;
memcpy((char *) fe->id2.i_symlink, symname, l);
i_size_write(inode, newsize);
inode->i_blocks = 0;
}
status = ocfs2_mark_inode_dirty(handle, inode, new_fe_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
if (!ocfs2_inode_is_fast_symlink(inode)) {
status = ocfs2_create_symlink_data(osb, handle, inode,
symname);
if (status < 0) {
mlog_errno(status);
goto bail;
}
}
status = ocfs2_add_entry(handle, dentry, inode,
le64_to_cpu(fe->i_blkno), parent_fe_bh,
de_bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
if (status) {
mlog_errno(status);
goto bail;
}
insert_inode_hash(inode);
dentry->d_op = &ocfs2_dentry_ops;
d_instantiate(dentry, inode);
bail:
if (handle)
ocfs2_commit_trans(osb, handle);
ocfs2_meta_unlock(dir, 1);
if (new_fe_bh)
brelse(new_fe_bh);
if (parent_fe_bh)
brelse(parent_fe_bh);
if (de_bh)
brelse(de_bh);
if (inode_ac)
ocfs2_free_alloc_context(inode_ac);
if (data_ac)
ocfs2_free_alloc_context(data_ac);
if ((status < 0) && inode)
iput(inode);
mlog_exit(status);
return status;
}
int ocfs2_check_dir_entry(struct inode * dir,
struct ocfs2_dir_entry * de,
struct buffer_head * bh,
unsigned long offset)
{
const char *error_msg = NULL;
const int rlen = le16_to_cpu(de->rec_len);
if (rlen < OCFS2_DIR_REC_LEN(1))
error_msg = "rec_len is smaller than minimal";
else if (rlen % 4 != 0)
error_msg = "rec_len % 4 != 0";
else if (rlen < OCFS2_DIR_REC_LEN(de->name_len))
error_msg = "rec_len is too small for name_len";
else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
error_msg = "directory entry across blocks";
if (error_msg != NULL)
mlog(ML_ERROR, "bad entry in directory #%llu: %s - "
"offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg,
offset, (unsigned long long)le64_to_cpu(de->inode), rlen,
de->name_len);
return error_msg == NULL ? 1 : 0;
}
/* we don't always have a dentry for what we want to add, so people
* like orphan dir can call this instead.
*
* If you pass me insert_bh, I'll skip the search of the other dir
* blocks and put the record in there.
*/
static int __ocfs2_add_entry(handle_t *handle,
struct inode *dir,
const char *name, int namelen,
struct inode *inode, u64 blkno,
struct buffer_head *parent_fe_bh,
struct buffer_head *insert_bh)
{
unsigned long offset;
unsigned short rec_len;
struct ocfs2_dir_entry *de, *de1;
struct super_block *sb;
int retval, status;
mlog_entry_void();
sb = dir->i_sb;
if (!namelen)
return -EINVAL;
rec_len = OCFS2_DIR_REC_LEN(namelen);
offset = 0;
de = (struct ocfs2_dir_entry *) insert_bh->b_data;
while (1) {
BUG_ON((char *)de >= sb->s_blocksize + insert_bh->b_data);
/* These checks should've already been passed by the
* prepare function, but I guess we can leave them
* here anyway. */
if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
retval = -ENOENT;
goto bail;
}
if (ocfs2_match(namelen, name, de)) {
retval = -EEXIST;
goto bail;
}
if (((le64_to_cpu(de->inode) == 0) &&
(le16_to_cpu(de->rec_len) >= rec_len)) ||
(le16_to_cpu(de->rec_len) >=
(OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) {
status = ocfs2_journal_access(handle, dir, insert_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
/* By now the buffer is marked for journaling */
offset += le16_to_cpu(de->rec_len);
if (le64_to_cpu(de->inode)) {
de1 = (struct ocfs2_dir_entry *)((char *) de +
OCFS2_DIR_REC_LEN(de->name_len));
de1->rec_len =
cpu_to_le16(le16_to_cpu(de->rec_len) -
OCFS2_DIR_REC_LEN(de->name_len));
de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
de = de1;
}
de->file_type = OCFS2_FT_UNKNOWN;
if (blkno) {
de->inode = cpu_to_le64(blkno);
ocfs2_set_de_type(de, inode->i_mode);
} else
de->inode = 0;
de->name_len = namelen;
memcpy(de->name, name, namelen);
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
dir->i_version++;
status = ocfs2_journal_dirty(handle, insert_bh);
retval = 0;
goto bail;
}
offset += le16_to_cpu(de->rec_len);
de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
}
/* when you think about it, the assert above should prevent us
* from ever getting here. */
retval = -ENOSPC;
bail:
mlog_exit(retval);
return retval;
}
/*
* ocfs2_delete_entry deletes a directory entry by merging it with the
* previous entry
*/
static int ocfs2_delete_entry(handle_t *handle,
struct inode *dir,
struct ocfs2_dir_entry *de_del,
struct buffer_head *bh)
{
struct ocfs2_dir_entry *de, *pde;
int i, status = -ENOENT;
mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
i = 0;
pde = NULL;
de = (struct ocfs2_dir_entry *) bh->b_data;
while (i < bh->b_size) {
if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
status = -EIO;
mlog_errno(status);
goto bail;
}
if (de == de_del) {
status = ocfs2_journal_access(handle, dir, bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
status = -EIO;
mlog_errno(status);
goto bail;
}
if (pde)
pde->rec_len =
cpu_to_le16(le16_to_cpu(pde->rec_len) +
le16_to_cpu(de->rec_len));
else
de->inode = 0;
dir->i_version++;
status = ocfs2_journal_dirty(handle, bh);
goto bail;
}
i += le16_to_cpu(de->rec_len);
pde = de;
de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
}
bail:
mlog_exit(status);
return status;
}
/*
* Returns 0 if not found, -1 on failure, and 1 on success
*/
static int inline ocfs2_search_dirblock(struct buffer_head *bh,
struct inode *dir,
const char *name, int namelen,
unsigned long offset,
struct ocfs2_dir_entry **res_dir)
{
struct ocfs2_dir_entry *de;
char *dlimit, *de_buf;
int de_len;
int ret = 0;
mlog_entry_void();
de_buf = bh->b_data;
dlimit = de_buf + dir->i_sb->s_blocksize;
while (de_buf < dlimit) {
/* this code is executed quadratically often */
/* do minimal checking `by hand' */
de = (struct ocfs2_dir_entry *) de_buf;
if (de_buf + namelen <= dlimit &&
ocfs2_match(namelen, name, de)) {
/* found a match - just to be sure, do a full check */
if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
ret = -1;
goto bail;
}
*res_dir = de;
ret = 1;
goto bail;
}
/* prevent looping on a bad block */
de_len = le16_to_cpu(de->rec_len);
if (de_len <= 0) {
ret = -1;
goto bail;
}
de_buf += de_len;
offset += de_len;
}
bail:
mlog_exit(ret);
return ret;
}
struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
struct inode *dir,
struct ocfs2_dir_entry **res_dir)
{
struct super_block *sb;
struct buffer_head *bh_use[NAMEI_RA_SIZE];
struct buffer_head *bh, *ret = NULL;
unsigned long start, block, b;
int ra_max = 0; /* Number of bh's in the readahead
buffer, bh_use[] */
int ra_ptr = 0; /* Current index into readahead
buffer */
int num = 0;
int nblocks, i, err;
mlog_entry_void();
*res_dir = NULL;
sb = dir->i_sb;
nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
start = OCFS2_I(dir)->ip_dir_start_lookup;
if (start >= nblocks)
start = 0;
block = start;
restart:
do {
/*
* We deal with the read-ahead logic here.
*/
if (ra_ptr >= ra_max) {
/* Refill the readahead buffer */
ra_ptr = 0;
b = block;
for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
/*
* Terminate if we reach the end of the
* directory and must wrap, or if our
* search has finished at this block.
*/
if (b >= nblocks || (num && block == start)) {
bh_use[ra_max] = NULL;
break;
}
num++;
bh = ocfs2_bread(dir, b++, &err, 1);
bh_use[ra_max] = bh;
}
}
if ((bh = bh_use[ra_ptr++]) == NULL)
goto next;
wait_on_buffer(bh);
if (!buffer_uptodate(bh)) {
/* read error, skip block & hope for the best */
ocfs2_error(dir->i_sb, "reading directory %llu, "
"offset %lu\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno,
block);
brelse(bh);
goto next;
}
i = ocfs2_search_dirblock(bh, dir, name, namelen,
block << sb->s_blocksize_bits,
res_dir);
if (i == 1) {
OCFS2_I(dir)->ip_dir_start_lookup = block;
ret = bh;
goto cleanup_and_exit;
} else {
brelse(bh);
if (i < 0)
goto cleanup_and_exit;
}
next:
if (++block >= nblocks)
block = 0;
} while (block != start);
/*
* If the directory has grown while we were searching, then
* search the last part of the directory before giving up.
*/
block = nblocks;
nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
if (block < nblocks) {
start = 0;
goto restart;
}
cleanup_and_exit:
/* Clean up the read-ahead blocks */
for (; ra_ptr < ra_max; ra_ptr++)
brelse(bh_use[ra_ptr]);
mlog_exit_ptr(ret);
return ret;
}
static int ocfs2_blkno_stringify(u64 blkno, char *name)
{
int status, namelen;
mlog_entry_void();
namelen = snprintf(name, OCFS2_ORPHAN_NAMELEN + 1, "%016llx",
(long long)blkno);
if (namelen <= 0) {
if (namelen)
status = namelen;
else
status = -EINVAL;
mlog_errno(status);
goto bail;
}
if (namelen != OCFS2_ORPHAN_NAMELEN) {
status = -EINVAL;
mlog_errno(status);
goto bail;
}
mlog(0, "built filename '%s' for orphan dir (len=%d)\n", name,
namelen);
status = 0;
bail:
mlog_exit(status);
return status;
}
static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
struct inode **ret_orphan_dir,
struct inode *inode,
char *name,
struct buffer_head **de_bh)
{
struct inode *orphan_dir_inode;
struct buffer_head *orphan_dir_bh = NULL;
int status = 0;
status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
if (status < 0) {
mlog_errno(status);
return status;
}
orphan_dir_inode = ocfs2_get_system_file_inode(osb,
ORPHAN_DIR_SYSTEM_INODE,
osb->slot_num);
if (!orphan_dir_inode) {
status = -ENOENT;
mlog_errno(status);
return status;
}
mutex_lock(&orphan_dir_inode->i_mutex);
status = ocfs2_meta_lock(orphan_dir_inode, &orphan_dir_bh, 1);
if (status < 0) {
mlog_errno(status);
goto leave;
}
status = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
orphan_dir_bh, name,
OCFS2_ORPHAN_NAMELEN, de_bh);
if (status < 0) {
ocfs2_meta_unlock(orphan_dir_inode, 1);
mlog_errno(status);
goto leave;
}
*ret_orphan_dir = orphan_dir_inode;
leave:
if (status) {
mutex_unlock(&orphan_dir_inode->i_mutex);
iput(orphan_dir_inode);
}
if (orphan_dir_bh)
brelse(orphan_dir_bh);
mlog_exit(status);
return status;
}
static int ocfs2_orphan_add(struct ocfs2_super *osb,
handle_t *handle,
struct inode *inode,
struct ocfs2_dinode *fe,
char *name,
struct buffer_head *de_bh,
struct inode *orphan_dir_inode)
{
struct buffer_head *orphan_dir_bh = NULL;
int status = 0;
struct ocfs2_dinode *orphan_fe;
mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
status = ocfs2_read_block(osb,
OCFS2_I(orphan_dir_inode)->ip_blkno,
&orphan_dir_bh, OCFS2_BH_CACHED,
orphan_dir_inode);
if (status < 0) {
mlog_errno(status);
goto leave;
}
status = ocfs2_journal_access(handle, orphan_dir_inode, orphan_dir_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto leave;
}
/* we're a cluster, and nlink can change on disk from
* underneath us... */
orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
if (S_ISDIR(inode->i_mode))
le16_add_cpu(&orphan_fe->i_links_count, 1);
orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
status = ocfs2_journal_dirty(handle, orphan_dir_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
status = __ocfs2_add_entry(handle, orphan_dir_inode, name,
OCFS2_ORPHAN_NAMELEN, inode,
OCFS2_I(inode)->ip_blkno,
orphan_dir_bh, de_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
/* Record which orphan dir our inode now resides
* in. delete_inode will use this to determine which orphan
* dir to lock. */
spin_lock(&OCFS2_I(inode)->ip_lock);
OCFS2_I(inode)->ip_orphaned_slot = osb->slot_num;
spin_unlock(&OCFS2_I(inode)->ip_lock);
mlog(0, "Inode %llu orphaned in slot %d\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
leave:
if (orphan_dir_bh)
brelse(orphan_dir_bh);
mlog_exit(status);
return status;
}
/* unlike orphan_add, we expect the orphan dir to already be locked here. */
int ocfs2_orphan_del(struct ocfs2_super *osb,
handle_t *handle,
struct inode *orphan_dir_inode,
struct inode *inode,
struct buffer_head *orphan_dir_bh)
{
char name[OCFS2_ORPHAN_NAMELEN + 1];
struct ocfs2_dinode *orphan_fe;
int status = 0;
struct buffer_head *target_de_bh = NULL;
struct ocfs2_dir_entry *target_de = NULL;
mlog_entry_void();
status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
if (status < 0) {
mlog_errno(status);
goto leave;
}
mlog(0, "removing '%s' from orphan dir %llu (namelen=%d)\n",
name, (unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
OCFS2_ORPHAN_NAMELEN);
/* find it's spot in the orphan directory */
target_de_bh = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN,
orphan_dir_inode, &target_de);
if (!target_de_bh) {
status = -ENOENT;
mlog_errno(status);
goto leave;
}
/* remove it from the orphan directory */
status = ocfs2_delete_entry(handle, orphan_dir_inode, target_de,
target_de_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
status = ocfs2_journal_access(handle,orphan_dir_inode, orphan_dir_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto leave;
}
/* do the i_nlink dance! :) */
orphan_fe = (struct ocfs2_dinode *) orphan_dir_bh->b_data;
if (S_ISDIR(inode->i_mode))
le16_add_cpu(&orphan_fe->i_links_count, -1);
orphan_dir_inode->i_nlink = le16_to_cpu(orphan_fe->i_links_count);
status = ocfs2_journal_dirty(handle, orphan_dir_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
leave:
if (target_de_bh)
brelse(target_de_bh);
mlog_exit(status);
return status;
}
struct inode_operations ocfs2_dir_iops = {
.create = ocfs2_create,
.lookup = ocfs2_lookup,
.link = ocfs2_link,
.unlink = ocfs2_unlink,
.rmdir = ocfs2_unlink,
.symlink = ocfs2_symlink,
.mkdir = ocfs2_mkdir,
.mknod = ocfs2_mknod,
.rename = ocfs2_rename,
.setattr = ocfs2_setattr,
.getattr = ocfs2_getattr,
.permission = ocfs2_permission,
};
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