microsoft
/
WSL2-Linux-Kernel
зеркало из https://github.com/microsoft/WSL2-Linux-Kernel.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
WSL2-Linux-Kernel/fs/ocfs2/namei.c

2502 строки
60 KiB
C
Исходник Ответственный История

/* -*- 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>
#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 "ocfs2_trace.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;
trace_ocfs2_lookup(dir, dentry, dentry->d_name.len,
dentry->d_name.name,
(unsigned long long)OCFS2_I(dir)->ip_blkno, 0);
if (dentry->d_name.len > OCFS2_MAX_FILENAME_LEN) {
ret = ERR_PTR(-ENAMETOOLONG);
goto bail;
}
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:
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;
}
} else
ocfs2_dentry_attach_gen(dentry);
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:
trace_ocfs2_lookup_ret(ret);
return ret;
}
static struct inode *ocfs2_get_init_inode(struct inode *dir, umode_t 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))
set_nlink(inode, 2);
inode_init_owner(inode, dir, mode);
dquot_initialize(inode);
return inode;
}
static int ocfs2_mknod(struct inode *dir,
struct dentry *dentry,
umode_t 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, };
sigset_t oldset;
int did_block_signals = 0;
trace_ocfs2_mknod(dir, dentry, dentry->d_name.len, dentry->d_name.name,
(unsigned long long)OCFS2_I(dir)->ip_blkno,
(unsigned long)dev, mode);
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, &dentry->d_name, &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;
}
/* Starting to change things, restart is no longer possible. */
ocfs2_block_signals(&oldset);
did_block_signals = 1;
status = dquot_alloc_inode(inode);
if (status)
goto leave;
did_quota_inode = 1;
/* 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);
ocfs2_journal_dirty(handle, parent_fe_bh);
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;
}
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 (did_block_signals)
ocfs2_unblock_signals(&oldset);
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);
}
if (status)
mlog_errno(status);
return status;
}
static int __ocfs2_mknod_locked(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,
u64 fe_blkno, u64 suballoc_loc, u16 suballoc_bit)
{
int status = 0;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
struct ocfs2_dinode *fe = NULL;
struct ocfs2_extent_list *fel;
u16 feat;
*new_fe_bh = NULL;
/* 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_loc = cpu_to_le64(suballoc_loc);
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));
}
ocfs2_journal_dirty(handle, *new_fe_bh);
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;
}
}
if (status)
mlog_errno(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;
u64 suballoc_loc, fe_blkno = 0;
u16 suballoc_bit;
*new_fe_bh = NULL;
status = ocfs2_claim_new_inode(handle, dir, parent_fe_bh,
inode_ac, &suballoc_loc,
&suballoc_bit, &fe_blkno);
if (status < 0) {
mlog_errno(status);
return status;
}
return __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh,
parent_fe_bh, handle, inode_ac,
fe_blkno, suballoc_loc, suballoc_bit);
}
static int ocfs2_mkdir(struct inode *dir,
struct dentry *dentry,
umode_t mode)
{
int ret;
trace_ocfs2_mkdir(dir, dentry, dentry->d_name.len, dentry->d_name.name,
OCFS2_I(dir)->ip_blkno, mode);
ret = ocfs2_mknod(dir, dentry, mode | S_IFDIR, 0);
if (ret)
mlog_errno(ret);
return ret;
}
static int ocfs2_create(struct inode *dir,
struct dentry *dentry,
umode_t mode,
struct nameidata *nd)
{
int ret;
trace_ocfs2_create(dir, dentry, dentry->d_name.len, dentry->d_name.name,
(unsigned long long)OCFS2_I(dir)->ip_blkno, mode);
ret = ocfs2_mknod(dir, dentry, mode | S_IFREG, 0);
if (ret)
mlog_errno(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, };
sigset_t oldset;
trace_ocfs2_link((unsigned long long)OCFS2_I(inode)->ip_blkno,
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;
}
/* Starting to change things, restart is no longer possible. */
ocfs2_block_signals(&oldset);
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);
ocfs2_journal_dirty(handle, fe_bh);
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;
}
ihold(inode);
d_instantiate(dentry, inode);
out_commit:
ocfs2_commit_trans(osb, handle);
ocfs2_unblock_signals(&oldset);
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);
if (err)
mlog_errno(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, };
trace_ocfs2_unlink(dir, dentry, dentry->d_name.len,
dentry->d_name.name,
(unsigned long long)OCFS2_I(dir)->ip_blkno,
(unsigned long long)OCFS2_I(inode)->ip_blkno);
dquot_initialize(dir);
BUG_ON(dentry->d_parent->d_inode != dir);
if (inode == osb->root_inode)
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;
trace_ocfs2_unlink_noent(
(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);
ocfs2_journal_dirty(handle, fe_bh);
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);
if (status)
mlog_errno(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;
trace_ocfs2_double_lock((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 */
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);
brelse(*bh2);
*bh2 = NULL;
}
if (status != -ENOENT)
mlog_errno(status);
}
trace_ocfs2_double_lock_end(
(unsigned long long)OCFS2_I(inode1)->ip_blkno,
(unsigned long long)OCFS2_I(inode2)->ip_blkno);
bail:
if (status)
mlog_errno(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;
u32 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. */
trace_ocfs2_rename(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;
trace_ocfs2_rename_target_exists(new_dentry->d_name.len,
new_dentry->d_name.name);
goto bail;
}
if (OCFS2_I(new_inode)->ip_blkno != newfe_blkno) {
status = -EACCES;
trace_ocfs2_rename_disagree(
(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;
trace_ocfs2_rename_over_existing(
(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);
ocfs2_journal_dirty(handle, newfe_bh);
} 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);
ocfs2_journal_dirty(handle, old_inode_bh);
} 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) {
drop_nlink(new_inode);
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);
drop_nlink(old_dir);
if (new_inode) {
drop_nlink(new_inode);
} 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);
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);
if (status)
mlog_errno(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;
trace_ocfs2_create_symlink_data((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);
ocfs2_journal_dirty(handle, bhs[virtual]);
virtual++;
p_blkno++;
bytes_left -= sb->s_blocksize;
}
status = 0;
bail:
if (bhs) {
for(i = 0; i < blocks; i++)
brelse(bhs[i]);
kfree(bhs);
}
if (status)
mlog_errno(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, };
sigset_t oldset;
int did_block_signals = 0;
trace_ocfs2_symlink_begin(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, &dentry->d_name, &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;
}
/* Starting to change things, restart is no longer possible. */
ocfs2_block_signals(&oldset);
did_block_signals = 1;
status = dquot_alloc_inode(inode);
if (status)
goto bail;
did_quota_inode = 1;
trace_ocfs2_symlink_create(dir, dentry, dentry->d_name.len,
dentry->d_name.name,
(unsigned long long)OCFS2_I(dir)->ip_blkno,
inode->i_mode);
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;
inode->i_op = &ocfs2_symlink_inode_operations;
if (l > ocfs2_fast_symlink_chars(sb)) {
u32 offset = 0;
status = dquot_alloc_space_nodirty(inode,
ocfs2_clusters_to_bytes(osb->sb, 1));
if (status)
goto bail;
did_quota = 1;
inode->i_mapping->a_ops = &ocfs2_aops;
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_mapping->a_ops = &ocfs2_fast_symlink_aops;
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;
}
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);
if (did_block_signals)
ocfs2_unblock_signals(&oldset);
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);
}
if (status)
mlog_errno(status);
return status;
}
static int ocfs2_blkno_stringify(u64 blkno, char *name)
{
int status, namelen;
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;
}
trace_ocfs2_blkno_stringify(blkno, name, namelen);
status = 0;
bail:
if (status < 0)
mlog_errno(status);
return status;
}
static int ocfs2_lookup_lock_orphan_dir(struct ocfs2_super *osb,
struct inode **ret_orphan_dir,
struct buffer_head **ret_orphan_dir_bh)
{
struct inode *orphan_dir_inode;
struct buffer_head *orphan_dir_bh = NULL;
int ret = 0;
orphan_dir_inode = ocfs2_get_system_file_inode(osb,
ORPHAN_DIR_SYSTEM_INODE,
osb->slot_num);
if (!orphan_dir_inode) {
ret = -ENOENT;
mlog_errno(ret);
return ret;
}
mutex_lock(&orphan_dir_inode->i_mutex);
ret = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
if (ret < 0) {
mutex_unlock(&orphan_dir_inode->i_mutex);
iput(orphan_dir_inode);
mlog_errno(ret);
return ret;
}
*ret_orphan_dir = orphan_dir_inode;
*ret_orphan_dir_bh = orphan_dir_bh;
return 0;
}
static int __ocfs2_prepare_orphan_dir(struct inode *orphan_dir_inode,
struct buffer_head *orphan_dir_bh,
u64 blkno,
char *name,
struct ocfs2_dir_lookup_result *lookup)
{
int ret;
struct ocfs2_super *osb = OCFS2_SB(orphan_dir_inode->i_sb);
ret = ocfs2_blkno_stringify(blkno, name);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
ret = ocfs2_prepare_dir_for_insert(osb, orphan_dir_inode,
orphan_dir_bh, name,
OCFS2_ORPHAN_NAMELEN, lookup);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
return 0;
}
/**
* ocfs2_prepare_orphan_dir() - Prepare an orphan directory for
* insertion of an orphan.
* @osb: ocfs2 file system
* @ret_orphan_dir: Orphan dir inode - returned locked!
* @blkno: Actual block number of the inode to be inserted into orphan dir.
* @lookup: dir lookup result, to be passed back into functions like
* ocfs2_orphan_add
*
* Returns zero on success and the ret_orphan_dir, name and lookup
* fields will be populated.
*
* Returns non-zero on failure.
*/
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 = NULL;
struct buffer_head *orphan_dir_bh = NULL;
int ret = 0;
ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir_inode,
&orphan_dir_bh);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
ret = __ocfs2_prepare_orphan_dir(orphan_dir_inode, orphan_dir_bh,
blkno, name, lookup);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
*ret_orphan_dir = orphan_dir_inode;
out:
brelse(orphan_dir_bh);
if (ret) {
ocfs2_inode_unlock(orphan_dir_inode, 1);
mutex_unlock(&orphan_dir_inode->i_mutex);
iput(orphan_dir_inode);
}
if (ret)
mlog_errno(ret);
return ret;
}
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;
trace_ocfs2_orphan_add_begin(
(unsigned long long)OCFS2_I(inode)->ip_blkno);
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);
set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
ocfs2_journal_dirty(handle, orphan_dir_bh);
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);
trace_ocfs2_orphan_add_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
osb->slot_num);
leave:
brelse(orphan_dir_bh);
if (status)
mlog_errno(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, };
status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno, name);
if (status < 0) {
mlog_errno(status);
goto leave;
}
trace_ocfs2_orphan_del(
(unsigned long long)OCFS2_I(orphan_dir_inode)->ip_blkno,
name, 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);
set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
ocfs2_journal_dirty(handle, orphan_dir_bh);
leave:
ocfs2_free_dir_lookup_result(&lookup);
if (status)
mlog_errno(status);
return status;
}
/**
* ocfs2_prep_new_orphaned_file() - Prepare the orphan dir to receive a newly
* allocated file. This is different from the typical 'add to orphan dir'
* operation in that the inode does not yet exist. This is a problem because
* the orphan dir stringifies the inode block number to come up with it's
* dirent. Obviously if the inode does not yet exist we have a chicken and egg
* problem. This function works around it by calling deeper into the orphan
* and suballoc code than other callers. Use this only by necessity.
* @dir: The directory which this inode will ultimately wind up under - not the
* orphan dir!
* @dir_bh: buffer_head the @dir inode block
* @orphan_name: string of length (CFS2_ORPHAN_NAMELEN + 1). Will be filled
* with the string to be used for orphan dirent. Pass back to the orphan dir
* code.
* @ret_orphan_dir: orphan dir inode returned to be passed back into orphan
* dir code.
* @ret_di_blkno: block number where the new inode will be allocated.
* @orphan_insert: Dir insert context to be passed back into orphan dir code.
* @ret_inode_ac: Inode alloc context to be passed back to the allocator.
*
* Returns zero on success and the ret_orphan_dir, name and lookup
* fields will be populated.
*
* Returns non-zero on failure.
*/
static int ocfs2_prep_new_orphaned_file(struct inode *dir,
struct buffer_head *dir_bh,
char *orphan_name,
struct inode **ret_orphan_dir,
u64 *ret_di_blkno,
struct ocfs2_dir_lookup_result *orphan_insert,
struct ocfs2_alloc_context **ret_inode_ac)
{
int ret;
u64 di_blkno;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
struct inode *orphan_dir = NULL;
struct buffer_head *orphan_dir_bh = NULL;
struct ocfs2_alloc_context *inode_ac = NULL;
ret = ocfs2_lookup_lock_orphan_dir(osb, &orphan_dir, &orphan_dir_bh);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
/* reserve an inode spot */
ret = ocfs2_reserve_new_inode(osb, &inode_ac);
if (ret < 0) {
if (ret != -ENOSPC)
mlog_errno(ret);
goto out;
}
ret = ocfs2_find_new_inode_loc(dir, dir_bh, inode_ac,
&di_blkno);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = __ocfs2_prepare_orphan_dir(orphan_dir, orphan_dir_bh,
di_blkno, orphan_name, orphan_insert);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
out:
if (ret == 0) {
*ret_orphan_dir = orphan_dir;
*ret_di_blkno = di_blkno;
*ret_inode_ac = inode_ac;
/*
* orphan_name and orphan_insert are already up to
* date via prepare_orphan_dir
*/
} else {
/* Unroll reserve_new_inode* */
if (inode_ac)
ocfs2_free_alloc_context(inode_ac);
/* Unroll orphan dir locking */
mutex_unlock(&orphan_dir->i_mutex);
ocfs2_inode_unlock(orphan_dir, 1);
iput(orphan_dir);
}
brelse(orphan_dir_bh);
return 0;
}
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, };
u64 uninitialized_var(di_blkno), suballoc_loc;
u16 suballoc_bit;
status = ocfs2_inode_lock(dir, &parent_di_bh, 1);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
return status;
}
status = ocfs2_prep_new_orphaned_file(dir, parent_di_bh,
orphan_name, &orphan_dir,
&di_blkno, &orphan_insert, &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;
status = ocfs2_claim_new_inode_at_loc(handle, dir, inode_ac,
&suballoc_loc,
&suballoc_bit, di_blkno);
if (status < 0) {
mlog_errno(status);
goto leave;
}
clear_nlink(inode);
/* do the real work now. */
status = __ocfs2_mknod_locked(dir, inode,
0, &new_di_bh, parent_di_bh, handle,
inode_ac, di_blkno, suballoc_loc,
suballoc_bit);
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 < 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, };
trace_ocfs2_mv_orphaned_inode_to_new(dir, dentry,
dentry->d_name.len, dentry->d_name.name,
(unsigned long long)OCFS2_I(dir)->ip_blkno,
(unsigned long long)OCFS2_I(inode)->ip_blkno);
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;
set_nlink(inode, 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;
}
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);
if (status)
mlog_errno(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,
.get_acl = ocfs2_iop_get_acl,
};
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку