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linux/fs/ocfs2/namei.c
Mark Fasheh a9743fcdc0 ocfs2: Add directory entry later in ocfs2_symlink() and ocfs2_mknod() 
If we get a failure during creation of an inode we'll allow the orphan code
to remove the inode, which is correct. However, we need to ensure that we
don't get any errors after the call to ocfs2_add_entry(), otherwise we could
leave a dangling directory reference. The solution is simple - in both
cases, all I had to do was move ocfs2_dentry_attach_lock() above the
ocfs2_add_entry() call.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
2010-04-23 11:42:22 -07:00

2368 lines
56 KiB
C
Raw Blame History

/* -*- 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>
#include <linux/quotaops.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 "xattr.h"
#include "acl.h"
#include "buffer_head_io.h"
static int ocfs2_mknod_locked(struct ocfs2_super *osb,
struct inode *dir,
struct inode *inode,
dev_t dev,
struct buffer_head **new_fe_bh,
struct buffer_head *parent_fe_bh,
handle_t *handle,
struct ocfs2_alloc_context *inode_ac);
static int ocfs2_prepare_orphan_dir(struct ocfs2_super *osb,
struct inode **ret_orphan_dir,
u64 blkno,
char *name,
struct ocfs2_dir_lookup_result *lookup);
static int ocfs2_orphan_add(struct ocfs2_super *osb,
handle_t *handle,
struct inode *inode,
struct buffer_head *fe_bh,
char *name,
struct ocfs2_dir_lookup_result *lookup,
struct inode *orphan_dir_inode);
static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
handle_t *handle,
struct inode *inode,
const char *symname);
/* 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 inode *inode = NULL;
struct dentry *ret;
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_inode_lock_nested(dir, NULL, 0, OI_LS_PARENT);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
ret = ERR_PTR(status);
goto bail;
}
status = ocfs2_lookup_ino_from_name(dir, dentry->d_name.name,
dentry->d_name.len, &blkno);
if (status < 0)
goto bail_add;
inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0);
if (IS_ERR(inode)) {
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;
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 downconvert thread and have a stale dentry. */
ocfs2_inode_unlock(dir, 0);
bail:
mlog_exit_ptr(ret);
return ret;
}
static struct inode *ocfs2_get_init_inode(struct inode *dir, int mode)
{
struct inode *inode;
inode = new_inode(dir->i_sb);
if (!inode) {
mlog(ML_ERROR, "new_inode failed!\n");
return NULL;
}
/* populate as many fields early on as possible - many of
* these are used by the support functions here and in
* callers. */
if (S_ISDIR(mode))
inode->i_nlink = 2;
else
inode->i_nlink = 1;
inode->i_uid = current_fsuid();
if (dir->i_mode & S_ISGID) {
inode->i_gid = dir->i_gid;
if (S_ISDIR(mode))
mode |= S_ISGID;
} else
inode->i_gid = current_fsgid();
inode->i_mode = mode;
dquot_initialize(inode);
return inode;
}
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 inode *inode = NULL;
struct ocfs2_alloc_context *inode_ac = NULL;
struct ocfs2_alloc_context *data_ac = NULL;
struct ocfs2_alloc_context *meta_ac = NULL;
int want_clusters = 0;
int want_meta = 0;
int xattr_credits = 0;
struct ocfs2_security_xattr_info si = {
.enable = 1,
};
int did_quota_inode = 0;
struct ocfs2_dir_lookup_result lookup = { 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);
dquot_initialize(dir);
/* get our super block */
osb = OCFS2_SB(dir->i_sb);
status = ocfs2_inode_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(osb))) {
status = -EMLINK;
goto leave;
}
dirfe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
if (!ocfs2_read_links_count(dirfe)) {
/* 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, &lookup);
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;
}
inode = ocfs2_get_init_inode(dir, mode);
if (!inode) {
status = -ENOMEM;
mlog_errno(status);
goto leave;
}
/* get security xattr */
status = ocfs2_init_security_get(inode, dir, &si);
if (status) {
if (status == -EOPNOTSUPP)
si.enable = 0;
else {
mlog_errno(status);
goto leave;
}
}
/* calculate meta data/clusters for setting security and acl xattr */
status = ocfs2_calc_xattr_init(dir, parent_fe_bh, mode,
&si, &want_clusters,
&xattr_credits, &want_meta);
if (status < 0) {
mlog_errno(status);
goto leave;
}
/* Reserve a cluster if creating an extent based directory. */
if (S_ISDIR(mode) && !ocfs2_supports_inline_data(osb)) {
want_clusters += 1;
/* Dir indexing requires extra space as well */
if (ocfs2_supports_indexed_dirs(osb))
want_meta++;
}
status = ocfs2_reserve_new_metadata_blocks(osb, want_meta, &meta_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
goto leave;
}
status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
goto leave;
}
handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb,
S_ISDIR(mode),
xattr_credits));
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status);
goto leave;
}
status = dquot_alloc_inode(inode);
if (status)
goto leave;
did_quota_inode = 1;
mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry,
inode->i_mode, (unsigned long)dev, dentry->d_name.len,
dentry->d_name.name);
/* do the real work now. */
status = ocfs2_mknod_locked(osb, dir, inode, dev,
&new_fe_bh, parent_fe_bh, handle,
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, meta_ac);
if (status < 0) {
mlog_errno(status);
goto leave;
}
status = ocfs2_journal_access_di(handle, INODE_CACHE(dir),
parent_fe_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto leave;
}
ocfs2_add_links_count(dirfe, 1);
status = ocfs2_journal_dirty(handle, parent_fe_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
inc_nlink(dir);
}
status = ocfs2_init_acl(handle, inode, dir, new_fe_bh, parent_fe_bh,
meta_ac, data_ac);
if (status < 0) {
mlog_errno(status);
goto leave;
}
if (si.enable) {
status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
meta_ac, data_ac);
if (status < 0) {
mlog_errno(status);
goto leave;
}
}
/*
* Do this before adding the entry to the directory. We add
* also set d_op after success so that ->d_iput() will cleanup
* the dentry lock even if ocfs2_add_entry() fails below.
*/
status = ocfs2_dentry_attach_lock(dentry, inode,
OCFS2_I(dir)->ip_blkno);
if (status) {
mlog_errno(status);
goto leave;
}
dentry->d_op = &ocfs2_dentry_ops;
status = ocfs2_add_entry(handle, dentry, inode,
OCFS2_I(inode)->ip_blkno, parent_fe_bh,
&lookup);
if (status < 0) {
mlog_errno(status);
goto leave;
}
insert_inode_hash(inode);
d_instantiate(dentry, inode);
status = 0;
leave:
if (status < 0 && did_quota_inode)
dquot_free_inode(inode);
if (handle)
ocfs2_commit_trans(osb, handle);
ocfs2_inode_unlock(dir, 1);
if (status == -ENOSPC)
mlog(0, "Disk is full\n");
brelse(new_fe_bh);
brelse(parent_fe_bh);
kfree(si.name);
kfree(si.value);
ocfs2_free_dir_lookup_result(&lookup);
if (inode_ac)
ocfs2_free_alloc_context(inode_ac);
if (data_ac)
ocfs2_free_alloc_context(data_ac);
if (meta_ac)
ocfs2_free_alloc_context(meta_ac);
/*
* We should call iput after the i_mutex of the bitmap been
* unlocked in ocfs2_free_alloc_context, or the
* ocfs2_delete_inode will mutex_lock again.
*/
if ((status < 0) && inode) {
OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
clear_nlink(inode);
iput(inode);
}
mlog_exit(status);
return status;
}
static int ocfs2_mknod_locked(struct ocfs2_super *osb,
struct inode *dir,
struct inode *inode,
dev_t dev,
struct buffer_head **new_fe_bh,
struct buffer_head *parent_fe_bh,
handle_t *handle,
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;
u16 feat;
*new_fe_bh = NULL;
status = ocfs2_claim_new_inode(osb, handle, dir, parent_fe_bh,
inode_ac, &suballoc_bit, &fe_blkno);
if (status < 0) {
mlog_errno(status);
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;
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_CACHE(inode), *new_fe_bh);
status = ocfs2_journal_access_di(handle, INODE_CACHE(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(inode_ac->ac_alloc_slot);
fe->i_uid = cpu_to_le32(inode->i_uid);
fe->i_gid = cpu_to_le32(inode->i_gid);
fe->i_mode = cpu_to_le16(inode->i_mode);
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
fe->id1.dev1.i_rdev = cpu_to_le64(huge_encode_dev(dev));
ocfs2_set_links_count(fe, 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;
/*
* If supported, directories start with inline data. If inline
* isn't supported, but indexing is, we start them as indexed.
*/
feat = le16_to_cpu(fe->i_dyn_features);
if (S_ISDIR(inode->i_mode) && ocfs2_supports_inline_data(osb)) {
fe->i_dyn_features = cpu_to_le16(feat | OCFS2_INLINE_DATA_FL);
fe->id2.i_data.id_count = cpu_to_le16(
ocfs2_max_inline_data_with_xattr(osb->sb, fe));
} else {
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;
}
ocfs2_populate_inode(inode, fe, 1);
ocfs2_ci_set_new(osb, INODE_CACHE(inode));
if (!ocfs2_mount_local(osb)) {
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 */
leave:
if (status < 0) {
if (*new_fe_bh) {
brelse(*new_fe_bh);
*new_fe_bh = NULL;
}
}
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 ocfs2_dinode *fe = NULL;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
struct ocfs2_dir_lookup_result lookup = { NULL, };
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;
dquot_initialize(dir);
err = ocfs2_inode_lock_nested(dir, &parent_fe_bh, 1, OI_LS_PARENT);
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, &lookup);
if (err < 0) {
mlog_errno(err);
goto out;
}
err = ocfs2_inode_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 (ocfs2_read_links_count(fe) >= ocfs2_link_max(osb)) {
err = -EMLINK;
goto out_unlock_inode;
}
handle = ocfs2_start_trans(osb, ocfs2_link_credits(osb->sb));
if (IS_ERR(handle)) {
err = PTR_ERR(handle);
handle = NULL;
mlog_errno(err);
goto out_unlock_inode;
}
err = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (err < 0) {
mlog_errno(err);
goto out_commit;
}
inc_nlink(inode);
inode->i_ctime = CURRENT_TIME;
ocfs2_set_links_count(fe, 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) {
ocfs2_add_links_count(fe, -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, &lookup);
if (err) {
ocfs2_add_links_count(fe, -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_inode_unlock(inode, 1);
out:
ocfs2_inode_unlock(dir, 1);
brelse(fe_bh);
brelse(parent_fe_bh);
ocfs2_free_dir_lookup_result(&lookup);
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;
char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
struct ocfs2_dir_lookup_result lookup = { NULL, };
struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
mlog_entry("(0x%p, 0x%p, '%.*s')\n", dir, dentry,
dentry->d_name.len, dentry->d_name.name);
dquot_initialize(dir);
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_inode_lock_nested(dir, &parent_node_bh, 1,
OI_LS_PARENT);
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,
&lookup);
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_inode_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 (inode->i_nlink != 2 || !ocfs2_empty_dir(inode)) {
status = -ENOTEMPTY;
goto leave;
}
}
status = ocfs2_remote_dentry_delete(dentry);
if (status < 0) {
/* This remote delete should succeed under all normal
* circumstances. */
mlog_errno(status);
goto leave;
}
if (inode_is_unlinkable(inode)) {
status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
OCFS2_I(inode)->ip_blkno,
orphan_name, &orphan_insert);
if (status < 0) {
mlog_errno(status);
goto leave;
}
}
handle = ocfs2_start_trans(osb, ocfs2_unlink_credits(osb->sb));
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status);
goto leave;
}
status = ocfs2_journal_access_di(handle, INODE_CACHE(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_bh, orphan_name,
&orphan_insert, orphan_dir);
if (status < 0) {
mlog_errno(status);
goto leave;
}
}
/* delete the name from the parent dir */
status = ocfs2_delete_entry(handle, dir, &lookup);
if (status < 0) {
mlog_errno(status);
goto leave;
}
if (S_ISDIR(inode->i_mode))
drop_nlink(inode);
drop_nlink(inode);
ocfs2_set_links_count(fe, inode->i_nlink);
status = ocfs2_journal_dirty(handle, fe_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
dir->i_ctime = dir->i_mtime = CURRENT_TIME;
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);
if (S_ISDIR(inode->i_mode))
inc_nlink(dir);
}
leave:
if (handle)
ocfs2_commit_trans(osb, handle);
if (child_locked)
ocfs2_inode_unlock(inode, 1);
ocfs2_inode_unlock(dir, 1);
if (orphan_dir) {
/* This was locked for us in ocfs2_prepare_orphan_dir() */
ocfs2_inode_unlock(orphan_dir, 1);
mutex_unlock(&orphan_dir->i_mutex);
iput(orphan_dir);
}
brelse(fe_bh);
brelse(parent_node_bh);
ocfs2_free_dir_lookup_result(&orphan_insert);
ocfs2_free_dir_lookup_result(&lookup);
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_inode_lock_nested(inode2, bh2, 1,
OI_LS_RENAME1);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
goto bail;
}
}
/* lock id1 */
status = ocfs2_inode_lock_nested(inode1, bh1, 1, OI_LS_RENAME2);
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_inode_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_inode_unlock(inode1, 1);
if (inode1 != inode2)
ocfs2_inode_unlock(inode2, 1);
}
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, target_exists = 0;
int old_child_locked = 0, new_child_locked = 0, update_dot_dot = 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 *newfe_bh = NULL;
struct buffer_head *old_inode_bh = NULL;
struct ocfs2_super *osb = NULL;
u64 newfe_blkno, old_de_ino;
handle_t *handle = NULL;
struct buffer_head *old_dir_bh = NULL;
struct buffer_head *new_dir_bh = NULL;
nlink_t old_dir_nlink = old_dir->i_nlink;
struct ocfs2_dinode *old_di;
struct ocfs2_dir_lookup_result old_inode_dot_dot_res = { NULL, };
struct ocfs2_dir_lookup_result target_lookup_res = { NULL, };
struct ocfs2_dir_lookup_result old_entry_lookup = { NULL, };
struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
struct ocfs2_dir_lookup_result target_insert = { NULL, };
/* 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);
dquot_initialize(old_dir);
dquot_initialize(new_dir);
osb = OCFS2_SB(old_dir->i_sb);
if (new_inode) {
if (!igrab(new_inode))
BUG();
}
/* Assume a directory hierarchy 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_dir != new_dir && S_ISDIR(old_inode->i_mode)) {
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;
}
}
/*
* Aside from allowing a meta data update, the locking here
* also ensures that the downconvert thread on other nodes
* won't have to concurrently downconvert the inode and the
* dentry locks.
*/
status = ocfs2_inode_lock_nested(old_inode, &old_inode_bh, 1,
OI_LS_PARENT);
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)) {
u64 old_inode_parent;
update_dot_dot = 1;
status = ocfs2_find_files_on_disk("..", 2, &old_inode_parent,
old_inode,
&old_inode_dot_dot_res);
if (status) {
status = -EIO;
goto bail;
}
if (old_inode_parent != OCFS2_I(old_dir)->ip_blkno) {
status = -EIO;
goto bail;
}
if (!new_inode && new_dir != old_dir &&
new_dir->i_nlink >= ocfs2_link_max(osb)) {
status = -EMLINK;
goto bail;
}
}
status = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
old_dentry->d_name.len,
&old_de_ino);
if (status) {
status = -ENOENT;
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 (old_de_ino != OCFS2_I(old_inode)->ip_blkno) {
status = -ENOENT;
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,
&target_lookup_res);
/* 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 (status == 0)
target_exists = 1;
if (!target_exists && new_inode) {
/*
* Target was unlinked by another node while we were
* waiting to get to ocfs2_rename(). There isn't
* anything we can do here to help the situation, so
* bubble up the appropriate error.
*/
status = -ENOENT;
goto bail;
}
/* In case we need to overwrite an existing file, we blow it
* away first */
if (target_exists) {
/* 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_inode_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_blkno=%llu "
"newfebh=%p bhblocknr=%llu\n",
(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,
OCFS2_I(new_inode)->ip_blkno,
orphan_name, &orphan_insert);
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,
&target_insert);
if (status < 0) {
mlog_errno(status);
goto bail;
}
}
handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status);
goto bail;
}
if (target_exists) {
if (S_ISDIR(new_inode->i_mode)) {
if (new_inode->i_nlink != 2 ||
!ocfs2_empty_dir(new_inode)) {
status = -ENOTEMPTY;
goto bail;
}
}
status = ocfs2_journal_access_di(handle, INODE_CACHE(new_inode),
newfe_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto bail;
}
if (S_ISDIR(new_inode->i_mode) ||
(ocfs2_read_links_count(newfe) == 1)) {
status = ocfs2_orphan_add(osb, handle, new_inode,
newfe_bh, orphan_name,
&orphan_insert, orphan_dir);
if (status < 0) {
mlog_errno(status);
goto bail;
}
}
/* change the dirent to point to the correct inode */
status = ocfs2_update_entry(new_dir, handle, &target_lookup_res,
old_inode);
if (status < 0) {
mlog_errno(status);
goto bail;
}
new_dir->i_version++;
if (S_ISDIR(new_inode->i_mode))
ocfs2_set_links_count(newfe, 0);
else
ocfs2_add_links_count(newfe, -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, &target_insert);
}
old_inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(old_inode);
status = ocfs2_journal_access_di(handle, INODE_CACHE(old_inode),
old_inode_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status >= 0) {
old_di = (struct ocfs2_dinode *) old_inode_bh->b_data;
old_di->i_ctime = cpu_to_le64(old_inode->i_ctime.tv_sec);
old_di->i_ctime_nsec = cpu_to_le32(old_inode->i_ctime.tv_nsec);
status = ocfs2_journal_dirty(handle, old_inode_bh);
if (status < 0)
mlog_errno(status);
} else
mlog_errno(status);
/*
* Now that the name has been added to new_dir, remove the old name.
*
* We don't keep any directory entry context around until now
* because the insert might have changed the type of directory
* we're dealing with.
*/
status = ocfs2_find_entry(old_dentry->d_name.name,
old_dentry->d_name.len, old_dir,
&old_entry_lookup);
if (status)
goto bail;
status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup);
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 (update_dot_dot) {
status = ocfs2_update_entry(old_inode, handle,
&old_inode_dot_dot_res, new_dir);
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);
ocfs2_mark_inode_dirty(handle, old_dir, old_dir_bh);
if (new_inode) {
mark_inode_dirty(new_inode);
ocfs2_mark_inode_dirty(handle, new_inode, newfe_bh);
}
if (old_dir != new_dir) {
/* Keep the same times on both directories.*/
new_dir->i_ctime = new_dir->i_mtime = old_dir->i_ctime;
/*
* This will also pick up the i_nlink change from the
* block above.
*/
ocfs2_mark_inode_dirty(handle, new_dir, 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_di(handle,
INODE_CACHE(old_dir),
old_dir_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
ocfs2_set_links_count(fe, 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_inode_unlock(old_inode, 1);
if (new_child_locked)
ocfs2_inode_unlock(new_inode, 1);
if (orphan_dir) {
/* This was locked for us in ocfs2_prepare_orphan_dir() */
ocfs2_inode_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);
ocfs2_free_dir_lookup_result(&target_lookup_res);
ocfs2_free_dir_lookup_result(&old_entry_lookup);
ocfs2_free_dir_lookup_result(&old_inode_dot_dot_res);
ocfs2_free_dir_lookup_result(&orphan_insert);
ocfs2_free_dir_lookup_result(&target_insert);
brelse(newfe_bh);
brelse(old_inode_bh);
brelse(old_dir_bh);
brelse(new_dir_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, 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, &p_blkno, &p_blocks,
NULL);
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_CACHE(inode),
bhs[virtual]);
status = ocfs2_journal_access(handle, INODE_CACHE(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++)
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 *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;
struct ocfs2_alloc_context *xattr_ac = NULL;
int want_clusters = 0;
int xattr_credits = 0;
struct ocfs2_security_xattr_info si = {
.enable = 1,
};
int did_quota = 0, did_quota_inode = 0;
struct ocfs2_dir_lookup_result lookup = { NULL, };
mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
dentry, symname, dentry->d_name.len, dentry->d_name.name);
dquot_initialize(dir);
sb = dir->i_sb;
osb = OCFS2_SB(sb);
l = strlen(symname) + 1;
credits = ocfs2_calc_symlink_credits(sb);
/* lock the parent directory */
status = ocfs2_inode_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 (!ocfs2_read_links_count(dirfe)) {
/* 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, &lookup);
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;
}
inode = ocfs2_get_init_inode(dir, S_IFLNK | S_IRWXUGO);
if (!inode) {
status = -ENOMEM;
mlog_errno(status);
goto bail;
}
/* get security xattr */
status = ocfs2_init_security_get(inode, dir, &si);
if (status) {
if (status == -EOPNOTSUPP)
si.enable = 0;
else {
mlog_errno(status);
goto bail;
}
}
/* calculate meta data/clusters for setting security xattr */
if (si.enable) {
status = ocfs2_calc_security_init(dir, &si, &want_clusters,
&xattr_credits, &xattr_ac);
if (status < 0) {
mlog_errno(status);
goto bail;
}
}
/* don't reserve bitmap space for fast symlinks. */
if (l > ocfs2_fast_symlink_chars(sb))
want_clusters += 1;
status = ocfs2_reserve_clusters(osb, want_clusters, &data_ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
goto bail;
}
handle = ocfs2_start_trans(osb, credits + xattr_credits);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status);
goto bail;
}
status = dquot_alloc_inode(inode);
if (status)
goto bail;
did_quota_inode = 1;
mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", dir, dentry,
inode->i_mode, dentry->d_name.len,
dentry->d_name.name);
status = ocfs2_mknod_locked(osb, dir, inode,
0, &new_fe_bh, parent_fe_bh, handle,
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)) {
u32 offset = 0;
inode->i_op = &ocfs2_symlink_inode_operations;
status = dquot_alloc_space_nodirty(inode,
ocfs2_clusters_to_bytes(osb->sb, 1));
if (status)
goto bail;
did_quota = 1;
status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
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_inode_sector_count(inode);
} 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;
}
}
if (si.enable) {
status = ocfs2_init_security_set(handle, inode, new_fe_bh, &si,
xattr_ac, data_ac);
if (status < 0) {
mlog_errno(status);
goto bail;
}
}
/*
* Do this before adding the entry to the directory. We add
* also set d_op after success so that ->d_iput() will cleanup
* the dentry lock even if ocfs2_add_entry() fails below.
*/
status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
if (status) {
mlog_errno(status);
goto bail;
}
dentry->d_op = &ocfs2_dentry_ops;
status = ocfs2_add_entry(handle, dentry, inode,
le64_to_cpu(fe->i_blkno), parent_fe_bh,
&lookup);
if (status < 0) {
mlog_errno(status);
goto bail;
}
insert_inode_hash(inode);
d_instantiate(dentry, inode);
bail:
if (status < 0 && did_quota)
dquot_free_space_nodirty(inode,
ocfs2_clusters_to_bytes(osb->sb, 1));
if (status < 0 && did_quota_inode)
dquot_free_inode(inode);
if (handle)
ocfs2_commit_trans(osb, handle);
ocfs2_inode_unlock(dir, 1);
brelse(new_fe_bh);
brelse(parent_fe_bh);
kfree(si.name);
kfree(si.value);
ocfs2_free_dir_lookup_result(&lookup);
if (inode_ac)
ocfs2_free_alloc_context(inode_ac);
if (data_ac)
ocfs2_free_alloc_context(data_ac);
if (xattr_ac)
ocfs2_free_alloc_context(xattr_ac);
if ((status < 0) && inode) {
OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SKIP_ORPHAN_DIR;
clear_nlink(inode);
iput(inode);
}
mlog_exit(status);
return status;
}
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,
u64 blkno,
char *name,
struct ocfs2_dir_lookup_result *lookup)
{
struct inode *orphan_dir_inode;
struct buffer_head *orphan_dir_bh = NULL;
int status = 0;
status = ocfs2_blkno_stringify(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_inode_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, lookup);
if (status < 0) {
ocfs2_inode_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);
}
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 buffer_head *fe_bh,
char *name,
struct ocfs2_dir_lookup_result *lookup,
struct inode *orphan_dir_inode)
{
struct buffer_head *orphan_dir_bh = NULL;
int status = 0;
struct ocfs2_dinode *orphan_fe;
struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
status = ocfs2_read_inode_block(orphan_dir_inode, &orphan_dir_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
status = ocfs2_journal_access_di(handle,
INODE_CACHE(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))
ocfs2_add_links_count(orphan_fe, 1);
orphan_dir_inode->i_nlink = ocfs2_read_links_count(orphan_fe);
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, lookup);
if (status < 0) {
mlog_errno(status);
goto leave;
}
/*
* We're going to journal the change of i_flags and i_orphaned_slot.
* It's safe anyway, though some callers may duplicate the journaling.
* Journaling within the func just make the logic look more
* straightforward.
*/
status = ocfs2_journal_access_di(handle,
INODE_CACHE(inode),
fe_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto leave;
}
le32_add_cpu(&fe->i_flags, OCFS2_ORPHANED_FL);
OCFS2_I(inode)->ip_flags &= ~OCFS2_INODE_SKIP_ORPHAN_DIR;
/* Record which orphan dir our inode now resides
* in. delete_inode will use this to determine which orphan
* dir to lock. */
fe->i_orphaned_slot = cpu_to_le16(osb->slot_num);
ocfs2_journal_dirty(handle, fe_bh);
mlog(0, "Inode %llu orphaned in slot %d\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno, osb->slot_num);
leave:
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 ocfs2_dir_lookup_result lookup = { 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 */
status = ocfs2_find_entry(name, OCFS2_ORPHAN_NAMELEN, orphan_dir_inode,
&lookup);
if (status) {
mlog_errno(status);
goto leave;
}
/* remove it from the orphan directory */
status = ocfs2_delete_entry(handle, orphan_dir_inode, &lookup);
if (status < 0) {
mlog_errno(status);
goto leave;
}
status = ocfs2_journal_access_di(handle,
INODE_CACHE(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))
ocfs2_add_links_count(orphan_fe, -1);
orphan_dir_inode->i_nlink = ocfs2_read_links_count(orphan_fe);
status = ocfs2_journal_dirty(handle, orphan_dir_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
leave:
ocfs2_free_dir_lookup_result(&lookup);
mlog_exit(status);
return status;
}
int ocfs2_create_inode_in_orphan(struct inode *dir,
int mode,
struct inode **new_inode)
{
int status, did_quota_inode = 0;
struct inode *inode = NULL;
struct inode *orphan_dir = NULL;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
struct ocfs2_dinode *di = NULL;
handle_t *handle = NULL;
char orphan_name[OCFS2_ORPHAN_NAMELEN + 1];
struct buffer_head *parent_di_bh = NULL;
struct buffer_head *new_di_bh = NULL;
struct ocfs2_alloc_context *inode_ac = NULL;
struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
return status;
}
/*
* We give the orphan dir the root blkno to fake an orphan name,
* and allocate enough space for our insertion.
*/
status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
osb->root_blkno,
orphan_name, &orphan_insert);
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;
}
inode = ocfs2_get_init_inode(dir, mode);
if (!inode) {
status = -ENOMEM;
mlog_errno(status);
goto leave;
}
handle = ocfs2_start_trans(osb, ocfs2_mknod_credits(osb->sb, 0, 0));
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status);
goto leave;
}
status = dquot_alloc_inode(inode);
if (status)
goto leave;
did_quota_inode = 1;
inode->i_nlink = 0;
/* do the real work now. */
status = ocfs2_mknod_locked(osb, dir, inode,
0, &new_di_bh, parent_di_bh, handle,
inode_ac);
if (status < 0) {
mlog_errno(status);
goto leave;
}
status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, orphan_name);
if (status < 0) {
mlog_errno(status);
goto leave;
}
di = (struct ocfs2_dinode *)new_di_bh->b_data;
status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name,
&orphan_insert, orphan_dir);
if (status < 0) {
mlog_errno(status);
goto leave;
}
/* get open lock so that only nodes can't remove it from orphan dir. */
status = ocfs2_open_lock(inode);
if (status < 0)
mlog_errno(status);
insert_inode_hash(inode);
leave:
if (status < 0 && did_quota_inode)
dquot_free_inode(inode);
if (handle)
ocfs2_commit_trans(osb, handle);
if (orphan_dir) {
/* This was locked for us in ocfs2_prepare_orphan_dir() */
ocfs2_inode_unlock(orphan_dir, 1);
mutex_unlock(&orphan_dir->i_mutex);
iput(orphan_dir);
}
if (status == -ENOSPC)
mlog(0, "Disk is full\n");
if ((status < 0) && inode) {
clear_nlink(inode);
iput(inode);
}
if (inode_ac)
ocfs2_free_alloc_context(inode_ac);
brelse(new_di_bh);
if (!status)
*new_inode = inode;
ocfs2_free_dir_lookup_result(&orphan_insert);
ocfs2_inode_unlock(dir, 1);
brelse(parent_di_bh);
return status;
}
int ocfs2_mv_orphaned_inode_to_new(struct inode *dir,
struct inode *inode,
struct dentry *dentry)
{
int status = 0;
struct buffer_head *parent_di_bh = NULL;
handle_t *handle = NULL;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
struct ocfs2_dinode *dir_di, *di;
struct inode *orphan_dir_inode = NULL;
struct buffer_head *orphan_dir_bh = NULL;
struct buffer_head *di_bh = NULL;
struct ocfs2_dir_lookup_result lookup = { NULL, };
mlog_entry("(0x%p, 0x%p, %.*s')\n", dir, dentry,
dentry->d_name.len, dentry->d_name.name);
status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
return status;
}
dir_di = (struct ocfs2_dinode *) parent_di_bh->b_data;
if (!dir_di->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_di_bh,
dentry->d_name.name,
dentry->d_name.len, &lookup);
if (status < 0) {
mlog_errno(status);
goto leave;
}
orphan_dir_inode = ocfs2_get_system_file_inode(osb,
ORPHAN_DIR_SYSTEM_INODE,
osb->slot_num);
if (!orphan_dir_inode) {
status = -EEXIST;
mlog_errno(status);
goto leave;
}
mutex_lock(&orphan_dir_inode->i_mutex);
status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
if (status < 0) {
mlog_errno(status);
mutex_unlock(&orphan_dir_inode->i_mutex);
iput(orphan_dir_inode);
goto leave;
}
status = ocfs2_read_inode_block(inode, &di_bh);
if (status < 0) {
mlog_errno(status);
goto orphan_unlock;
}
handle = ocfs2_start_trans(osb, ocfs2_rename_credits(osb->sb));
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status);
goto orphan_unlock;
}
status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto out_commit;
}
status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
orphan_dir_bh);
if (status < 0) {
mlog_errno(status);
goto out_commit;
}
di = (struct ocfs2_dinode *)di_bh->b_data;
le32_add_cpu(&di->i_flags, -OCFS2_ORPHANED_FL);
di->i_orphaned_slot = 0;
inode->i_nlink = 1;
ocfs2_set_links_count(di, inode->i_nlink);
ocfs2_journal_dirty(handle, di_bh);
status = ocfs2_add_entry(handle, dentry, inode,
OCFS2_I(inode)->ip_blkno, parent_di_bh,
&lookup);
if (status < 0) {
mlog_errno(status);
goto out_commit;
}
status = ocfs2_dentry_attach_lock(dentry, inode,
OCFS2_I(dir)->ip_blkno);
if (status) {
mlog_errno(status);
goto out_commit;
}
dentry->d_op = &ocfs2_dentry_ops;
d_instantiate(dentry, inode);
status = 0;
out_commit:
ocfs2_commit_trans(osb, handle);
orphan_unlock:
ocfs2_inode_unlock(orphan_dir_inode, 1);
mutex_unlock(&orphan_dir_inode->i_mutex);
iput(orphan_dir_inode);
leave:
ocfs2_inode_unlock(dir, 1);
brelse(di_bh);
brelse(parent_di_bh);
brelse(orphan_dir_bh);
ocfs2_free_dir_lookup_result(&lookup);
mlog_exit(status);
return status;
}
const 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,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = ocfs2_listxattr,
.removexattr = generic_removexattr,
.fiemap = ocfs2_fiemap,
};
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