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linux/fs/ocfs2/namei.c
Linus Torvalds 6a518afcc2 fs.acl.rework.v6.2 
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Merge tag 'fs.acl.rework.v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping

Pull VFS acl updates from Christian Brauner:
 "This contains the work that builds a dedicated vfs posix acl api.

  The origins of this work trace back to v5.19 but it took quite a while
  to understand the various filesystem specific implementations in
  sufficient detail and also come up with an acceptable solution.

  As we discussed and seen multiple times the current state of how posix
  acls are handled isn't nice and comes with a lot of problems: The
  current way of handling posix acls via the generic xattr api is error
  prone, hard to maintain, and type unsafe for the vfs until we call
  into the filesystem's dedicated get and set inode operations.

  It is already the case that posix acls are special-cased to death all
  the way through the vfs. There are an uncounted number of hacks that
  operate on the uapi posix acl struct instead of the dedicated vfs
  struct posix_acl. And the vfs must be involved in order to interpret
  and fixup posix acls before storing them to the backing store, caching
  them, reporting them to userspace, or for permission checking.

  Currently a range of hacks and duct tape exist to make this work. As
  with most things this is really no ones fault it's just something that
  happened over time. But the code is hard to understand and difficult
  to maintain and one is constantly at risk of introducing bugs and
  regressions when having to touch it.

  Instead of continuing to hack posix acls through the xattr handlers
  this series builds a dedicated posix acl api solely around the get and
  set inode operations.

  Going forward, the vfs_get_acl(), vfs_remove_acl(), and vfs_set_acl()
  helpers must be used in order to interact with posix acls. They
  operate directly on the vfs internal struct posix_acl instead of
  abusing the uapi posix acl struct as we currently do. In the end this
  removes all of the hackiness, makes the codepaths easier to maintain,
  and gets us type safety.

  This series passes the LTP and xfstests suites without any
  regressions. For xfstests the following combinations were tested:
   - xfs
   - ext4
   - btrfs
   - overlayfs
   - overlayfs on top of idmapped mounts
   - orangefs
   - (limited) cifs

  There's more simplifications for posix acls that we can make in the
  future if the basic api has made it.

  A few implementation details:

   - The series makes sure to retain exactly the same security and
     integrity module permission checks. Especially for the integrity
     modules this api is a win because right now they convert the uapi
     posix acl struct passed to them via a void pointer into the vfs
     struct posix_acl format to perform permission checking on the mode.

     There's a new dedicated security hook for setting posix acls which
     passes the vfs struct posix_acl not a void pointer. Basing checking
     on the posix acl stored in the uapi format is really unreliable.
     The vfs currently hacks around directly in the uapi struct storing
     values that frankly the security and integrity modules can't
     correctly interpret as evidenced by bugs we reported and fixed in
     this area. It's not necessarily even their fault it's just that the
     format we provide to them is sub optimal.

   - Some filesystems like 9p and cifs need access to the dentry in
     order to get and set posix acls which is why they either only
     partially or not even at all implement get and set inode
     operations. For example, cifs allows setxattr() and getxattr()
     operations but doesn't allow permission checking based on posix
     acls because it can't implement a get acl inode operation.

     Thus, this patch series updates the set acl inode operation to take
     a dentry instead of an inode argument. However, for the get acl
     inode operation we can't do this as the old get acl method is
     called in e.g., generic_permission() and inode_permission(). These
     helpers in turn are called in various filesystem's permission inode
     operation. So passing a dentry argument to the old get acl inode
     operation would amount to passing a dentry to the permission inode
     operation which we shouldn't and probably can't do.

     So instead of extending the existing inode operation Christoph
     suggested to add a new one. He also requested to ensure that the
     get and set acl inode operation taking a dentry are consistently
     named. So for this version the old get acl operation is renamed to
     ->get_inode_acl() and a new ->get_acl() inode operation taking a
     dentry is added. With this we can give both 9p and cifs get and set
     acl inode operations and in turn remove their complex custom posix
     xattr handlers.

     In the future I hope to get rid of the inode method duplication but
     it isn't like we have never had this situation. Readdir is just one
     example. And frankly, the overall gain in type safety and the more
     pleasant api wise are simply too big of a benefit to not accept
     this duplication for a while.

   - We've done a full audit of every codepaths using variant of the
     current generic xattr api to get and set posix acls and
     surprisingly it isn't that many places. There's of course always a
     chance that we might have missed some and if so I'm sure we'll find
     them soon enough.

     The crucial codepaths to be converted are obviously stacking
     filesystems such as ecryptfs and overlayfs.

     For a list of all callers currently using generic xattr api helpers
     see [2] including comments whether they support posix acls or not.

   - The old vfs generic posix acl infrastructure doesn't obey the
     create and replace semantics promised on the setxattr(2) manpage.
     This patch series doesn't address this. It really is something we
     should revisit later though.

  The patches are roughly organized as follows:

   (1) Change existing set acl inode operation to take a dentry
       argument (Intended to be a non-functional change)

   (2) Rename existing get acl method (Intended to be a non-functional
       change)

   (3) Implement get and set acl inode operations for filesystems that
       couldn't implement one before because of the missing dentry.
       That's mostly 9p and cifs (Intended to be a non-functional
       change)

   (4) Build posix acl api, i.e., add vfs_get_acl(), vfs_remove_acl(),
       and vfs_set_acl() including security and integrity hooks
       (Intended to be a non-functional change)

   (5) Implement get and set acl inode operations for stacking
       filesystems (Intended to be a non-functional change)

   (6) Switch posix acl handling in stacking filesystems to new posix
       acl api now that all filesystems it can stack upon support it.

   (7) Switch vfs to new posix acl api (semantical change)

   (8) Remove all now unused helpers

   (9) Additional regression fixes reported after we merged this into
       linux-next

  Thanks to Seth for a lot of good discussion around this and
  encouragement and input from Christoph"

* tag 'fs.acl.rework.v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping: (36 commits)
  posix_acl: Fix the type of sentinel in get_acl
  orangefs: fix mode handling
  ovl: call posix_acl_release() after error checking
  evm: remove dead code in evm_inode_set_acl()
  cifs: check whether acl is valid early
  acl: make vfs_posix_acl_to_xattr() static
  acl: remove a slew of now unused helpers
  9p: use stub posix acl handlers
  cifs: use stub posix acl handlers
  ovl: use stub posix acl handlers
  ecryptfs: use stub posix acl handlers
  evm: remove evm_xattr_acl_change()
  xattr: use posix acl api
  ovl: use posix acl api
  ovl: implement set acl method
  ovl: implement get acl method
  ecryptfs: implement set acl method
  ecryptfs: implement get acl method
  ksmbd: use vfs_remove_acl()
  acl: add vfs_remove_acl()
  ...
2022-12-12 18:46:39 -08:00

2923 lines
70 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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
*/
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/quotaops.h>
#include <linux/iversion.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 "ioctl.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,
bool dio);
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,
bool dio);
static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
handle_t *handle,
struct inode *inode,
const char *symname);
static int ocfs2_double_lock(struct ocfs2_super *osb,
struct buffer_head **bh1,
struct inode *inode1,
struct buffer_head **bh2,
struct inode *inode2,
int rename);
static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2);
/* 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,
unsigned int flags)
{
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 (!IS_ERR_OR_NULL(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;
int status;
inode = new_inode(dir->i_sb);
if (!inode) {
mlog(ML_ERROR, "new_inode failed!\n");
return ERR_PTR(-ENOMEM);
}
/* 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);
mode = mode_strip_sgid(&init_user_ns, dir, mode);
inode_init_owner(&init_user_ns, inode, dir, mode);
status = dquot_initialize(inode);
if (status)
return ERR_PTR(status);
return inode;
}
static void ocfs2_cleanup_add_entry_failure(struct ocfs2_super *osb,
struct dentry *dentry, struct inode *inode)
{
struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
ocfs2_simple_drop_lockres(osb, &dl->dl_lockres);
ocfs2_lock_res_free(&dl->dl_lockres);
BUG_ON(dl->dl_count != 1);
spin_lock(&dentry_attach_lock);
dentry->d_fsdata = NULL;
spin_unlock(&dentry_attach_lock);
kfree(dl);
iput(inode);
}
static int ocfs2_mknod(struct user_namespace *mnt_userns,
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 ocfs2_dinode *fe = NULL;
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;
struct ocfs2_dentry_lock *dl = NULL;
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);
status = dquot_initialize(dir);
if (status) {
mlog_errno(status);
return status;
}
/* 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 (IS_ERR(inode)) {
status = PTR_ERR(inode);
inode = NULL;
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;
}
fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
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 roll_back;
}
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 roll_back;
}
}
/*
* 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 roll_back;
}
dl = dentry->d_fsdata;
status = ocfs2_add_entry(handle, dentry, inode,
OCFS2_I(inode)->ip_blkno, parent_fe_bh,
&lookup);
if (status < 0) {
mlog_errno(status);
goto roll_back;
}
insert_inode_hash(inode);
d_instantiate(dentry, inode);
status = 0;
roll_back:
if (status < 0 && S_ISDIR(mode)) {
ocfs2_add_links_count(dirfe, -1);
drop_nlink(dir);
}
leave:
if (status < 0 && did_quota_inode)
dquot_free_inode(inode);
if (handle) {
if (status < 0 && fe)
ocfs2_set_links_count(fe, 0);
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.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_rwsem of the bitmap been
* unlocked in ocfs2_free_alloc_context, or the
* ocfs2_delete_inode will mutex_lock again.
*/
if ((status < 0) && inode) {
if (dl)
ocfs2_cleanup_add_entry_failure(osb, dentry, 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;
struct ocfs2_inode_info *oi = OCFS2_I(inode);
struct timespec64 ts;
*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);
oi->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 = -ENOMEM;
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(i_uid_read(inode));
fe->i_gid = cpu_to_le32(i_gid_read(inode));
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);
fe->i_flags |= cpu_to_le32(OCFS2_VALID_FL);
ktime_get_real_ts64(&ts);
fe->i_atime = fe->i_ctime = fe->i_mtime =
cpu_to_le64(ts.tv_sec);
fe->i_mtime_nsec = fe->i_ctime_nsec = fe->i_atime_nsec =
cpu_to_le32(ts.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);
}
ocfs2_update_inode_fsync_trans(handle, inode, 1);
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 user_namespace *mnt_userns,
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(&init_user_ns, dir, dentry, mode | S_IFDIR, 0);
if (ret)
mlog_errno(ret);
return ret;
}
static int ocfs2_create(struct user_namespace *mnt_userns,
struct inode *dir,
struct dentry *dentry,
umode_t mode,
bool excl)
{
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(&init_user_ns, 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 = d_inode(old_dentry);
struct inode *old_dir = d_inode(old_dentry->d_parent);
int err;
struct buffer_head *fe_bh = NULL;
struct buffer_head *old_dir_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;
u64 old_de_ino;
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;
err = dquot_initialize(dir);
if (err) {
mlog_errno(err);
return err;
}
err = ocfs2_double_lock(osb, &old_dir_bh, old_dir,
&parent_fe_bh, dir, 0);
if (err < 0) {
if (err != -ENOENT)
mlog_errno(err);
return err;
}
/* make sure both dirs have bhs
* get an extra ref on old_dir_bh if old==new */
if (!parent_fe_bh) {
if (old_dir_bh) {
parent_fe_bh = old_dir_bh;
get_bh(parent_fe_bh);
} else {
mlog(ML_ERROR, "%s: no old_dir_bh!\n", osb->uuid_str);
err = -EIO;
goto out;
}
}
if (!dir->i_nlink) {
err = -ENOENT;
goto out;
}
err = ocfs2_lookup_ino_from_name(old_dir, old_dentry->d_name.name,
old_dentry->d_name.len, &old_de_ino);
if (err) {
err = -ENOENT;
goto out;
}
/*
* Check whether another node removed the source inode while we
* were in the vfs.
*/
if (old_de_ino != OCFS2_I(inode)->ip_blkno) {
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(inode);
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_double_unlock(old_dir, dir);
brelse(fe_bh);
brelse(parent_fe_bh);
brelse(old_dir_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 ocfs2_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;
bool is_unlinkable = false;
struct inode *inode = d_inode(dentry);
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);
status = dquot_initialize(dir);
if (status) {
mlog_errno(status);
return status;
}
BUG_ON(d_inode(dentry->d_parent) != 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 (ocfs2_inode_is_unlinkable(inode)) {
status = ocfs2_prepare_orphan_dir(osb, &orphan_dir,
OCFS2_I(inode)->ip_blkno,
orphan_name, &orphan_insert,
false);
if (status < 0) {
mlog_errno(status);
goto leave;
}
is_unlinkable = true;
}
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;
/* 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(dir);
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);
goto leave;
}
if (is_unlinkable) {
status = ocfs2_orphan_add(osb, handle, inode, fe_bh,
orphan_name, &orphan_insert, orphan_dir, false);
if (status < 0)
mlog_errno(status);
}
leave:
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);
inode_unlock(orphan_dir);
iput(orphan_dir);
}
if (child_locked)
ocfs2_inode_unlock(inode, 1);
ocfs2_inode_unlock(dir, 1);
brelse(fe_bh);
brelse(parent_node_bh);
ocfs2_free_dir_lookup_result(&orphan_insert);
ocfs2_free_dir_lookup_result(&lookup);
if (status && (status != -ENOTEMPTY) && (status != -ENOENT))
mlog_errno(status);
return status;
}
static int ocfs2_check_if_ancestor(struct ocfs2_super *osb,
u64 src_inode_no, u64 dest_inode_no)
{
int ret = 0, i = 0;
u64 parent_inode_no = 0;
u64 child_inode_no = src_inode_no;
struct inode *child_inode;
#define MAX_LOOKUP_TIMES 32
while (1) {
child_inode = ocfs2_iget(osb, child_inode_no, 0, 0);
if (IS_ERR(child_inode)) {
ret = PTR_ERR(child_inode);
break;
}
ret = ocfs2_inode_lock(child_inode, NULL, 0);
if (ret < 0) {
iput(child_inode);
if (ret != -ENOENT)
mlog_errno(ret);
break;
}
ret = ocfs2_lookup_ino_from_name(child_inode, "..", 2,
&parent_inode_no);
ocfs2_inode_unlock(child_inode, 0);
iput(child_inode);
if (ret < 0) {
ret = -ENOENT;
break;
}
if (parent_inode_no == dest_inode_no) {
ret = 1;
break;
}
if (parent_inode_no == osb->root_inode->i_ino) {
ret = 0;
break;
}
child_inode_no = parent_inode_no;
if (++i >= MAX_LOOKUP_TIMES) {
mlog_ratelimited(ML_NOTICE, "max lookup times reached, "
"filesystem may have nested directories, "
"src inode: %llu, dest inode: %llu.\n",
(unsigned long long)src_inode_no,
(unsigned long long)dest_inode_no);
ret = 0;
break;
}
}
return ret;
}
/*
* The only place this should be used is rename and link!
* 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 rename)
{
int status;
int inode1_is_ancestor, inode2_is_ancestor;
struct ocfs2_inode_info *oi1 = OCFS2_I(inode1);
struct ocfs2_inode_info *oi2 = OCFS2_I(inode2);
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.
* and if they are nested, we lock ancestor first */
if (oi1->ip_blkno != oi2->ip_blkno) {
inode1_is_ancestor = ocfs2_check_if_ancestor(osb, oi2->ip_blkno,
oi1->ip_blkno);
if (inode1_is_ancestor < 0) {
status = inode1_is_ancestor;
goto bail;
}
inode2_is_ancestor = ocfs2_check_if_ancestor(osb, oi1->ip_blkno,
oi2->ip_blkno);
if (inode2_is_ancestor < 0) {
status = inode2_is_ancestor;
goto bail;
}
if ((inode1_is_ancestor == 1) ||
(oi1->ip_blkno < oi2->ip_blkno &&
inode2_is_ancestor == 0)) {
/* switch id1 and id2 around */
swap(bh2, bh1);
swap(inode2, inode1);
}
/* lock id2 */
status = ocfs2_inode_lock_nested(inode2, bh2, 1,
rename == 1 ? OI_LS_RENAME1 : OI_LS_PARENT);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
goto bail;
}
}
/* lock id1 */
status = ocfs2_inode_lock_nested(inode1, bh1, 1,
rename == 1 ? OI_LS_RENAME2 : OI_LS_PARENT);
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)oi1->ip_blkno,
(unsigned long long)oi2->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 user_namespace *mnt_userns,
struct inode *old_dir,
struct dentry *old_dentry,
struct inode *new_dir,
struct dentry *new_dentry,
unsigned int flags)
{
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 = d_inode(old_dentry);
struct inode *new_inode = d_inode(new_dentry);
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, };
bool should_add_orphan = false;
if (flags)
return -EINVAL;
/* 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);
status = dquot_initialize(old_dir);
if (status) {
mlog_errno(status);
goto bail;
}
status = dquot_initialize(new_dir);
if (status) {
mlog_errno(status);
goto bail;
}
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;
/* here we cannot guarantee the inodes haven't just been
* changed, so check if they are nested again */
status = ocfs2_check_if_ancestor(osb, new_dir->i_ino,
old_inode->i_ino);
if (status < 0) {
mlog_errno(status);
goto bail;
} else if (status == 1) {
status = -EPERM;
trace_ocfs2_rename_not_permitted(
(unsigned long long)old_inode->i_ino,
(unsigned long long)new_dir->i_ino);
goto bail;
}
}
/* 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, 1);
if (status < 0) {
mlog_errno(status);
goto bail;
}
parents_locked = 1;
if (!new_dir->i_nlink) {
status = -EACCES;
goto bail;
}
/* 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,
false);
if (status < 0) {
mlog_errno(status);
goto bail;
}
should_add_orphan = true;
}
} else {
BUG_ON(d_inode(new_dentry->d_parent) != 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;
}
/* 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;
}
inode_inc_iversion(new_dir);
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);
if (should_add_orphan) {
status = ocfs2_orphan_add(osb, handle, new_inode,
newfe_bh, orphan_name,
&orphan_insert, orphan_dir, false);
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(old_inode);
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) {
if (!is_journal_aborted(osb->journal->j_journal)) {
ocfs2_error(osb->sb, "new entry %.*s is added, but old entry %.*s "
"is not deleted.",
new_dentry->d_name.len, new_dentry->d_name.name,
old_dentry->d_name.len, old_dentry->d_name.name);
}
goto bail;
}
status = ocfs2_delete_entry(handle, old_dir, &old_entry_lookup);
if (status < 0) {
mlog_errno(status);
if (!is_journal_aborted(osb->journal->j_journal)) {
ocfs2_error(osb->sb, "new entry %.*s is added, but old entry %.*s "
"is not deleted.",
new_dentry->d_name.len, new_dentry->d_name.name,
old_dentry->d_name.len, old_dentry->d_name.name);
}
goto bail;
}
if (new_inode) {
drop_nlink(new_inode);
new_inode->i_ctime = current_time(new_inode);
}
old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
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 (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);
inode_unlock(orphan_dir);
iput(orphan_dir);
}
if (new_child_locked)
ocfs2_inode_unlock(new_inode, 1);
if (old_child_locked)
ocfs2_inode_unlock(old_inode, 1);
if (parents_locked)
ocfs2_double_unlock(old_dir, new_dir);
if (rename_lock)
ocfs2_rename_unlock(osb);
if (new_inode)
sync_mapping_buffers(old_inode->i_mapping);
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 user_namespace *mnt_userns,
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;
struct ocfs2_dentry_lock *dl = NULL;
trace_ocfs2_symlink_begin(dir, dentry, symname,
dentry->d_name.len, dentry->d_name.name);
status = dquot_initialize(dir);
if (status) {
mlog_errno(status);
goto bail;
}
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 (IS_ERR(inode)) {
status = PTR_ERR(inode);
inode = NULL;
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;
inode_nohighmem(inode);
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;
}
dl = dentry->d_fsdata;
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) {
if (status < 0 && fe)
ocfs2_set_links_count(fe, 0);
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.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) {
if (dl)
ocfs2_cleanup_add_entry_failure(osb, dentry, 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;
}
inode_lock(orphan_dir_inode);
ret = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
if (ret < 0) {
inode_unlock(orphan_dir_inode);
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,
bool dio)
{
int ret;
struct ocfs2_super *osb = OCFS2_SB(orphan_dir_inode->i_sb);
int namelen = dio ?
(OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN) :
OCFS2_ORPHAN_NAMELEN;
if (dio) {
ret = snprintf(name, OCFS2_DIO_ORPHAN_PREFIX_LEN + 1, "%s",
OCFS2_DIO_ORPHAN_PREFIX);
if (ret != OCFS2_DIO_ORPHAN_PREFIX_LEN) {
ret = -EINVAL;
mlog_errno(ret);
return ret;
}
ret = ocfs2_blkno_stringify(blkno,
name + OCFS2_DIO_ORPHAN_PREFIX_LEN);
} else
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,
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,
bool dio)
{
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, dio);
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);
inode_unlock(orphan_dir_inode);
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,
bool dio)
{
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;
int namelen = dio ?
(OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN) :
OCFS2_ORPHAN_NAMELEN;
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 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;
}
/* 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,
namelen, inode,
OCFS2_I(inode)->ip_blkno,
orphan_dir_bh, lookup);
if (status < 0) {
mlog_errno(status);
goto rollback;
}
if (dio) {
/* Update flag OCFS2_DIO_ORPHANED_FL and record the orphan
* slot.
*/
fe->i_flags |= cpu_to_le32(OCFS2_DIO_ORPHANED_FL);
fe->i_dio_orphaned_slot = cpu_to_le16(osb->slot_num);
} else {
fe->i_flags |= cpu_to_le32(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);
rollback:
if (status < 0) {
if (S_ISDIR(inode->i_mode))
ocfs2_add_links_count(orphan_fe, -1);
set_nlink(orphan_dir_inode, ocfs2_read_links_count(orphan_fe));
}
leave:
brelse(orphan_dir_bh);
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,
bool dio)
{
char name[OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN + 1];
struct ocfs2_dinode *orphan_fe;
int status = 0;
struct ocfs2_dir_lookup_result lookup = { NULL, };
if (dio) {
status = snprintf(name, OCFS2_DIO_ORPHAN_PREFIX_LEN + 1, "%s",
OCFS2_DIO_ORPHAN_PREFIX);
if (status != OCFS2_DIO_ORPHAN_PREFIX_LEN) {
status = -EINVAL;
mlog_errno(status);
return status;
}
status = ocfs2_blkno_stringify(OCFS2_I(inode)->ip_blkno,
name + OCFS2_DIO_ORPHAN_PREFIX_LEN);
} else
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, strlen(name));
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;
}
/* find it's spot in the orphan directory */
status = ocfs2_find_entry(name, strlen(name), 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;
}
/* 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,
false);
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 */
inode_unlock(orphan_dir);
ocfs2_inode_unlock(orphan_dir, 1);
iput(orphan_dir);
}
brelse(orphan_dir_bh);
return ret;
}
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);
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 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 (IS_ERR(inode)) {
status = PTR_ERR(inode);
inode = NULL;
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;
}
status = ocfs2_orphan_add(osb, handle, inode, new_di_bh, orphan_name,
&orphan_insert, orphan_dir, false);
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);
inode_unlock(orphan_dir);
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_add_inode_to_orphan(struct ocfs2_super *osb,
struct inode *inode)
{
char orphan_name[OCFS2_DIO_ORPHAN_PREFIX_LEN + OCFS2_ORPHAN_NAMELEN + 1];
struct inode *orphan_dir_inode = NULL;
struct ocfs2_dir_lookup_result orphan_insert = { NULL, };
struct buffer_head *di_bh = NULL;
int status = 0;
handle_t *handle = NULL;
struct ocfs2_dinode *di = NULL;
status = ocfs2_inode_lock(inode, &di_bh, 1);
if (status < 0) {
mlog_errno(status);
goto bail;
}
di = (struct ocfs2_dinode *) di_bh->b_data;
/*
* Another append dio crashed?
* If so, manually recover it first.
*/
if (unlikely(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL))) {
status = ocfs2_truncate_file(inode, di_bh, i_size_read(inode));
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
goto bail_unlock_inode;
}
status = ocfs2_del_inode_from_orphan(osb, inode, di_bh, 0, 0);
if (status < 0) {
mlog_errno(status);
goto bail_unlock_inode;
}
}
status = ocfs2_prepare_orphan_dir(osb, &orphan_dir_inode,
OCFS2_I(inode)->ip_blkno,
orphan_name,
&orphan_insert,
true);
if (status < 0) {
mlog_errno(status);
goto bail_unlock_inode;
}
handle = ocfs2_start_trans(osb,
OCFS2_INODE_ADD_TO_ORPHAN_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
goto bail_unlock_orphan;
}
status = ocfs2_orphan_add(osb, handle, inode, di_bh, orphan_name,
&orphan_insert, orphan_dir_inode, true);
if (status)
mlog_errno(status);
ocfs2_commit_trans(osb, handle);
bail_unlock_orphan:
ocfs2_inode_unlock(orphan_dir_inode, 1);
inode_unlock(orphan_dir_inode);
iput(orphan_dir_inode);
ocfs2_free_dir_lookup_result(&orphan_insert);
bail_unlock_inode:
ocfs2_inode_unlock(inode, 1);
brelse(di_bh);
bail:
return status;
}
int ocfs2_del_inode_from_orphan(struct ocfs2_super *osb,
struct inode *inode, struct buffer_head *di_bh,
int update_isize, loff_t end)
{
struct inode *orphan_dir_inode = NULL;
struct buffer_head *orphan_dir_bh = NULL;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
handle_t *handle = NULL;
int status = 0;
orphan_dir_inode = ocfs2_get_system_file_inode(osb,
ORPHAN_DIR_SYSTEM_INODE,
le16_to_cpu(di->i_dio_orphaned_slot));
if (!orphan_dir_inode) {
status = -ENOENT;
mlog_errno(status);
goto bail;
}
inode_lock(orphan_dir_inode);
status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
if (status < 0) {
inode_unlock(orphan_dir_inode);
iput(orphan_dir_inode);
mlog_errno(status);
goto bail;
}
handle = ocfs2_start_trans(osb,
OCFS2_INODE_DEL_FROM_ORPHAN_CREDITS);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
goto bail_unlock_orphan;
}
BUG_ON(!(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL)));
status = ocfs2_orphan_del(osb, handle, orphan_dir_inode,
inode, orphan_dir_bh, true);
if (status < 0) {
mlog_errno(status);
goto bail_commit;
}
status = ocfs2_journal_access_di(handle,
INODE_CACHE(inode),
di_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto bail_commit;
}
di->i_flags &= ~cpu_to_le32(OCFS2_DIO_ORPHANED_FL);
di->i_dio_orphaned_slot = 0;
if (update_isize) {
status = ocfs2_set_inode_size(handle, inode, di_bh, end);
if (status)
mlog_errno(status);
} else
ocfs2_journal_dirty(handle, di_bh);
bail_commit:
ocfs2_commit_trans(osb, handle);
bail_unlock_orphan:
ocfs2_inode_unlock(orphan_dir_inode, 1);
inode_unlock(orphan_dir_inode);
brelse(orphan_dir_bh);
iput(orphan_dir_inode);
bail:
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 = -ENOENT;
mlog_errno(status);
goto leave;
}
inode_lock(orphan_dir_inode);
status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
if (status < 0) {
mlog_errno(status);
inode_unlock(orphan_dir_inode);
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, false);
if (status < 0) {
mlog_errno(status);
goto out_commit;
}
di = (struct ocfs2_dinode *)di_bh->b_data;
di->i_flags &= ~cpu_to_le32(OCFS2_ORPHANED_FL);
di->i_orphaned_slot = 0;
set_nlink(inode, 1);
ocfs2_set_links_count(di, inode->i_nlink);
ocfs2_update_inode_fsync_trans(handle, inode, 1);
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);
inode_unlock(orphan_dir_inode);
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,
.listxattr = ocfs2_listxattr,
.fiemap = ocfs2_fiemap,
.get_inode_acl = ocfs2_iop_get_acl,
.set_acl = ocfs2_iop_set_acl,
.fileattr_get = ocfs2_fileattr_get,
.fileattr_set = ocfs2_fileattr_set,
};
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