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d4e9c4c3bf
linux-next/fs/gfs2/inode.c
Steven Whitehouse d4e9c4c3bf [GFS2] Add an additional argument to gfs2_trans_add_bh() 
This adds an extra argument to gfs2_trans_add_bh() to indicate whether the
bh being added to the transaction is metadata or data. Its currently unused
since all existing callers set it to 1 (metadata) but following patches will
make use of it.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-01-18 11:19:28 +00:00

1819 lines
38 KiB
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/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License v.2.
*/
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/posix_acl.h>
#include <linux/sort.h>
#include <asm/semaphore.h>
#include "gfs2.h"
#include "acl.h"
#include "bmap.h"
#include "dir.h"
#include "eattr.h"
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "log.h"
#include "meta_io.h"
#include "ops_address.h"
#include "ops_file.h"
#include "ops_inode.h"
#include "quota.h"
#include "rgrp.h"
#include "trans.h"
#include "unlinked.h"
/**
* inode_attr_in - Copy attributes from the dinode into the VFS inode
* @ip: The GFS2 inode (with embedded disk inode data)
* @inode: The Linux VFS inode
*
*/
static void inode_attr_in(struct gfs2_inode *ip, struct inode *inode)
{
inode->i_ino = ip->i_num.no_formal_ino;
switch (ip->i_di.di_mode & S_IFMT) {
case S_IFBLK:
case S_IFCHR:
inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor);
break;
default:
inode->i_rdev = 0;
break;
};
inode->i_mode = ip->i_di.di_mode;
inode->i_nlink = ip->i_di.di_nlink;
inode->i_uid = ip->i_di.di_uid;
inode->i_gid = ip->i_di.di_gid;
i_size_write(inode, ip->i_di.di_size);
inode->i_atime.tv_sec = ip->i_di.di_atime;
inode->i_mtime.tv_sec = ip->i_di.di_mtime;
inode->i_ctime.tv_sec = ip->i_di.di_ctime;
inode->i_atime.tv_nsec = 0;
inode->i_mtime.tv_nsec = 0;
inode->i_ctime.tv_nsec = 0;
inode->i_blksize = PAGE_SIZE;
inode->i_blocks = ip->i_di.di_blocks <<
(ip->i_sbd->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE)
inode->i_flags |= S_IMMUTABLE;
else
inode->i_flags &= ~S_IMMUTABLE;
if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY)
inode->i_flags |= S_APPEND;
else
inode->i_flags &= ~S_APPEND;
}
/**
* gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode
* @ip: The GFS2 inode (with embedded disk inode data)
*
*/
void gfs2_inode_attr_in(struct gfs2_inode *ip)
{
struct inode *inode;
inode = gfs2_ip2v_lookup(ip);
if (inode) {
inode_attr_in(ip, inode);
iput(inode);
}
}
/**
* gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
* @ip: The GFS2 inode
*
* Only copy out the attributes that we want the VFS layer
* to be able to modify.
*/
void gfs2_inode_attr_out(struct gfs2_inode *ip)
{
struct inode *inode = ip->i_vnode;
gfs2_assert_withdraw(ip->i_sbd,
(ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT));
ip->i_di.di_mode = inode->i_mode;
ip->i_di.di_uid = inode->i_uid;
ip->i_di.di_gid = inode->i_gid;
ip->i_di.di_atime = inode->i_atime.tv_sec;
ip->i_di.di_mtime = inode->i_mtime.tv_sec;
ip->i_di.di_ctime = inode->i_ctime.tv_sec;
}
/**
* gfs2_ip2v_lookup - Get the struct inode for a struct gfs2_inode
* @ip: the struct gfs2_inode to get the struct inode for
*
* Returns: A VFS inode, or NULL if none
*/
struct inode *gfs2_ip2v_lookup(struct gfs2_inode *ip)
{
struct inode *inode = NULL;
gfs2_assert_warn(ip->i_sbd, test_bit(GIF_MIN_INIT, &ip->i_flags));
spin_lock(&ip->i_spin);
if (ip->i_vnode)
inode = igrab(ip->i_vnode);
spin_unlock(&ip->i_spin);
return inode;
}
/**
* gfs2_ip2v - Get/Create a struct inode for a struct gfs2_inode
* @ip: the struct gfs2_inode to get the struct inode for
*
* Returns: A VFS inode, or NULL if no mem
*/
struct inode *gfs2_ip2v(struct gfs2_inode *ip)
{
struct inode *inode, *tmp;
inode = gfs2_ip2v_lookup(ip);
if (inode)
return inode;
tmp = new_inode(ip->i_sbd->sd_vfs);
if (!tmp)
return NULL;
inode_attr_in(ip, tmp);
if (S_ISREG(ip->i_di.di_mode)) {
tmp->i_op = &gfs2_file_iops;
tmp->i_fop = &gfs2_file_fops;
tmp->i_mapping->a_ops = &gfs2_file_aops;
} else if (S_ISDIR(ip->i_di.di_mode)) {
tmp->i_op = &gfs2_dir_iops;
tmp->i_fop = &gfs2_dir_fops;
} else if (S_ISLNK(ip->i_di.di_mode)) {
tmp->i_op = &gfs2_symlink_iops;
} else {
tmp->i_op = &gfs2_dev_iops;
init_special_inode(tmp, tmp->i_mode, tmp->i_rdev);
}
set_v2ip(tmp, NULL);
for (;;) {
spin_lock(&ip->i_spin);
if (!ip->i_vnode)
break;
inode = igrab(ip->i_vnode);
spin_unlock(&ip->i_spin);
if (inode) {
iput(tmp);
return inode;
}
yield();
}
inode = tmp;
gfs2_inode_hold(ip);
ip->i_vnode = inode;
set_v2ip(inode, ip);
spin_unlock(&ip->i_spin);
insert_inode_hash(inode);
return inode;
}
static int iget_test(struct inode *inode, void *opaque)
{
struct gfs2_inode *ip = get_v2ip(inode);
struct gfs2_inum *inum = (struct gfs2_inum *)opaque;
if (ip && ip->i_num.no_addr == inum->no_addr)
return 1;
return 0;
}
struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum)
{
return ilookup5(sb, (unsigned long)inum->no_formal_ino,
iget_test, inum);
}
void gfs2_inode_min_init(struct gfs2_inode *ip, unsigned int type)
{
spin_lock(&ip->i_spin);
if (!test_and_set_bit(GIF_MIN_INIT, &ip->i_flags)) {
ip->i_di.di_nlink = 1;
ip->i_di.di_mode = DT2IF(type);
}
spin_unlock(&ip->i_spin);
}
/**
* gfs2_inode_refresh - Refresh the incore copy of the dinode
* @ip: The GFS2 inode
*
* Returns: errno
*/
int gfs2_inode_refresh(struct gfs2_inode *ip)
{
struct buffer_head *dibh;
int error;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
return error;
if (gfs2_metatype_check(ip->i_sbd, dibh, GFS2_METATYPE_DI)) {
brelse(dibh);
return -EIO;
}
spin_lock(&ip->i_spin);
gfs2_dinode_in(&ip->i_di, dibh->b_data);
set_bit(GIF_MIN_INIT, &ip->i_flags);
spin_unlock(&ip->i_spin);
brelse(dibh);
if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) {
if (gfs2_consist_inode(ip))
gfs2_dinode_print(&ip->i_di);
return -EIO;
}
if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino)
return -ESTALE;
ip->i_vn = ip->i_gl->gl_vn;
return 0;
}
/**
* inode_create - create a struct gfs2_inode
* @i_gl: The glock covering the inode
* @inum: The inode number
* @io_gl: the iopen glock to acquire/hold (using holder in new gfs2_inode)
* @io_state: the state the iopen glock should be acquired in
* @ipp: pointer to put the returned inode in
*
* Returns: errno
*/
static int inode_create(struct gfs2_glock *i_gl, struct gfs2_inum *inum,
struct gfs2_glock *io_gl, unsigned int io_state,
struct gfs2_inode **ipp)
{
struct gfs2_sbd *sdp = i_gl->gl_sbd;
struct gfs2_inode *ip;
int error = 0;
ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
if (!ip)
return -ENOMEM;
memset(ip, 0, sizeof(struct gfs2_inode));
ip->i_num = *inum;
atomic_set(&ip->i_count, 1);
ip->i_vn = i_gl->gl_vn - 1;
ip->i_gl = i_gl;
ip->i_sbd = sdp;
spin_lock_init(&ip->i_spin);
init_rwsem(&ip->i_rw_mutex);
ip->i_greedy = gfs2_tune_get(sdp, gt_greedy_default);
error = gfs2_glock_nq_init(io_gl,
io_state, GL_LOCAL_EXCL | GL_EXACT,
&ip->i_iopen_gh);
if (error)
goto fail;
ip->i_iopen_gh.gh_owner = NULL;
spin_lock(&io_gl->gl_spin);
gfs2_glock_hold(i_gl);
set_gl2gl(io_gl, i_gl);
spin_unlock(&io_gl->gl_spin);
gfs2_glock_hold(i_gl);
set_gl2ip(i_gl, ip);
atomic_inc(&sdp->sd_inode_count);
*ipp = ip;
return 0;
fail:
gfs2_meta_cache_flush(ip);
kmem_cache_free(gfs2_inode_cachep, ip);
*ipp = NULL;
return error;
}
/**
* gfs2_inode_get - Create or get a reference on an inode
* @i_gl: The glock covering the inode
* @inum: The inode number
* @create:
* @ipp: pointer to put the returned inode in
*
* Returns: errno
*/
int gfs2_inode_get(struct gfs2_glock *i_gl, struct gfs2_inum *inum, int create,
struct gfs2_inode **ipp)
{
struct gfs2_sbd *sdp = i_gl->gl_sbd;
struct gfs2_glock *io_gl;
int error = 0;
gfs2_glmutex_lock(i_gl);
*ipp = get_gl2ip(i_gl);
if (*ipp) {
error = -ESTALE;
if ((*ipp)->i_num.no_formal_ino != inum->no_formal_ino)
goto out;
atomic_inc(&(*ipp)->i_count);
error = 0;
goto out;
}
if (!create)
goto out;
error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops,
CREATE, &io_gl);
if (!error) {
error = inode_create(i_gl, inum, io_gl, LM_ST_SHARED, ipp);
gfs2_glock_put(io_gl);
}
out:
gfs2_glmutex_unlock(i_gl);
return error;
}
void gfs2_inode_hold(struct gfs2_inode *ip)
{
gfs2_assert(ip->i_sbd, atomic_read(&ip->i_count) > 0);
atomic_inc(&ip->i_count);
}
void gfs2_inode_put(struct gfs2_inode *ip)
{
gfs2_assert(ip->i_sbd, atomic_read(&ip->i_count) > 0);
atomic_dec(&ip->i_count);
}
void gfs2_inode_destroy(struct gfs2_inode *ip)
{
struct gfs2_sbd *sdp = ip->i_sbd;
struct gfs2_glock *io_gl = ip->i_iopen_gh.gh_gl;
struct gfs2_glock *i_gl = ip->i_gl;
gfs2_assert_warn(sdp, !atomic_read(&ip->i_count));
gfs2_assert(sdp, get_gl2gl(io_gl) == i_gl);
spin_lock(&io_gl->gl_spin);
set_gl2gl(io_gl, NULL);
gfs2_glock_put(i_gl);
spin_unlock(&io_gl->gl_spin);
gfs2_glock_dq_uninit(&ip->i_iopen_gh);
gfs2_meta_cache_flush(ip);
kmem_cache_free(gfs2_inode_cachep, ip);
set_gl2ip(i_gl, NULL);
gfs2_glock_put(i_gl);
atomic_dec(&sdp->sd_inode_count);
}
static int dinode_dealloc(struct gfs2_inode *ip, struct gfs2_unlinked *ul)
{
struct gfs2_sbd *sdp = ip->i_sbd;
struct gfs2_alloc *al;
struct gfs2_rgrpd *rgd;
int error;
if (ip->i_di.di_blocks != 1) {
if (gfs2_consist_inode(ip))
gfs2_dinode_print(&ip->i_di);
return -EIO;
}
al = gfs2_alloc_get(ip);
error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
goto out;
error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
if (error)
goto out_qs;
rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
if (!rgd) {
gfs2_consist_inode(ip);
error = -EIO;
goto out_rindex_relse;
}
error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
&al->al_rgd_gh);
if (error)
goto out_rindex_relse;
error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_UNLINKED +
RES_STATFS + RES_QUOTA, 1);
if (error)
goto out_rg_gunlock;
gfs2_trans_add_gl(ip->i_gl);
gfs2_free_di(rgd, ip);
error = gfs2_unlinked_ondisk_rm(sdp, ul);
gfs2_trans_end(sdp);
clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
out_rg_gunlock:
gfs2_glock_dq_uninit(&al->al_rgd_gh);
out_rindex_relse:
gfs2_glock_dq_uninit(&al->al_ri_gh);
out_qs:
gfs2_quota_unhold(ip);
out:
gfs2_alloc_put(ip);
return error;
}
/**
* inode_dealloc - Deallocate all on-disk blocks for an inode (dinode)
* @sdp: the filesystem
* @inum: the inode number to deallocate
* @io_gh: a holder for the iopen glock for this inode
*
* Returns: errno
*/
static int inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul,
struct gfs2_holder *io_gh)
{
struct gfs2_inode *ip;
struct gfs2_holder i_gh;
int error;
error = gfs2_glock_nq_num(sdp,
ul->ul_ut.ut_inum.no_addr, &gfs2_inode_glops,
LM_ST_EXCLUSIVE, 0, &i_gh);
if (error)
return error;
/* We reacquire the iopen lock here to avoid a race with the NFS server
calling gfs2_read_inode() with the inode number of a inode we're in
the process of deallocating. And we can't keep our hold on the lock
from inode_dealloc_init() for deadlock reasons. */
gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY, io_gh);
error = gfs2_glock_nq(io_gh);
switch (error) {
case 0:
break;
case GLR_TRYFAILED:
error = 1;
default:
goto out;
}
gfs2_assert_warn(sdp, !get_gl2ip(i_gh.gh_gl));
error = inode_create(i_gh.gh_gl, &ul->ul_ut.ut_inum, io_gh->gh_gl,
LM_ST_EXCLUSIVE, &ip);
gfs2_glock_dq(io_gh);
if (error)
goto out;
error = gfs2_inode_refresh(ip);
if (error)
goto out_iput;
if (ip->i_di.di_nlink) {
if (gfs2_consist_inode(ip))
gfs2_dinode_print(&ip->i_di);
error = -EIO;
goto out_iput;
}
if (S_ISDIR(ip->i_di.di_mode) &&
(ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
error = gfs2_dir_exhash_dealloc(ip);
if (error)
goto out_iput;
}
if (ip->i_di.di_eattr) {
error = gfs2_ea_dealloc(ip);
if (error)
goto out_iput;
}
if (!gfs2_is_stuffed(ip)) {
error = gfs2_file_dealloc(ip);
if (error)
goto out_iput;
}
error = dinode_dealloc(ip, ul);
if (error)
goto out_iput;
out_iput:
gfs2_glmutex_lock(i_gh.gh_gl);
gfs2_inode_put(ip);
gfs2_inode_destroy(ip);
gfs2_glmutex_unlock(i_gh.gh_gl);
out:
gfs2_glock_dq_uninit(&i_gh);
return error;
}
/**
* try_inode_dealloc - Try to deallocate an inode and all its blocks
* @sdp: the filesystem
*
* Returns: 0 on success, -errno on error, 1 on busy (inode open)
*/
static int try_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul)
{
struct gfs2_holder io_gh;
int error = 0;
gfs2_try_toss_inode(sdp, &ul->ul_ut.ut_inum);
error = gfs2_glock_nq_num(sdp,
ul->ul_ut.ut_inum.no_addr, &gfs2_iopen_glops,
LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB, &io_gh);
switch (error) {
case 0:
break;
case GLR_TRYFAILED:
return 1;
default:
return error;
}
gfs2_glock_dq(&io_gh);
error = inode_dealloc(sdp, ul, &io_gh);
gfs2_holder_uninit(&io_gh);
return error;
}
static int inode_dealloc_uninit(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul)
{
struct gfs2_rgrpd *rgd;
struct gfs2_holder ri_gh, rgd_gh;
int error;
error = gfs2_rindex_hold(sdp, &ri_gh);
if (error)
return error;
rgd = gfs2_blk2rgrpd(sdp, ul->ul_ut.ut_inum.no_addr);
if (!rgd) {
gfs2_consist(sdp);
error = -EIO;
goto out;
}
error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rgd_gh);
if (error)
goto out;
error = gfs2_trans_begin(sdp,
RES_RG_BIT + RES_UNLINKED + RES_STATFS,
0);
if (error)
goto out_gunlock;
gfs2_free_uninit_di(rgd, ul->ul_ut.ut_inum.no_addr);
gfs2_unlinked_ondisk_rm(sdp, ul);
gfs2_trans_end(sdp);
out_gunlock:
gfs2_glock_dq_uninit(&rgd_gh);
out:
gfs2_glock_dq_uninit(&ri_gh);
return error;
}
int gfs2_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul)
{
if (ul->ul_ut.ut_flags & GFS2_UTF_UNINIT)
return inode_dealloc_uninit(sdp, ul);
else
return try_inode_dealloc(sdp, ul);
}
/**
* gfs2_change_nlink - Change nlink count on inode
* @ip: The GFS2 inode
* @diff: The change in the nlink count required
*
* Returns: errno
*/
int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
{
struct buffer_head *dibh;
uint32_t nlink;
int error;
nlink = ip->i_di.di_nlink + diff;
/* If we are reducing the nlink count, but the new value ends up being
bigger than the old one, we must have underflowed. */
if (diff < 0 && nlink > ip->i_di.di_nlink) {
if (gfs2_consist_inode(ip))
gfs2_dinode_print(&ip->i_di);
return -EIO;
}
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
return error;
ip->i_di.di_nlink = nlink;
ip->i_di.di_ctime = get_seconds();
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
gfs2_dinode_out(&ip->i_di, dibh->b_data);
brelse(dibh);
return 0;
}
/**
* gfs2_lookupi - Look up a filename in a directory and return its inode
* @d_gh: An initialized holder for the directory glock
* @name: The name of the inode to look for
* @is_root: If 1, ignore the caller's permissions
* @i_gh: An uninitialized holder for the new inode glock
*
* There will always be a vnode (Linux VFS inode) for the d_gh inode unless
* @is_root is true.
*
* Returns: errno
*/
int gfs2_lookupi(struct gfs2_inode *dip, struct qstr *name, int is_root,
struct gfs2_inode **ipp)
{
struct gfs2_sbd *sdp = dip->i_sbd;
struct gfs2_holder d_gh;
struct gfs2_inum inum;
unsigned int type;
struct gfs2_glock *gl;
int error;
if (!name->len || name->len > GFS2_FNAMESIZE)
return -ENAMETOOLONG;
if (gfs2_filecmp(name, ".", 1) ||
(gfs2_filecmp(name, "..", 2) && dip == sdp->sd_root_dir)) {
gfs2_inode_hold(dip);
*ipp = dip;
return 0;
}
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
if (error)
return error;
if (!is_root) {
error = gfs2_repermission(dip->i_vnode, MAY_EXEC, NULL);
if (error)
goto out;
}
error = gfs2_dir_search(dip, name, &inum, &type);
if (error)
goto out;
error = gfs2_glock_get(sdp, inum.no_addr, &gfs2_inode_glops,
CREATE, &gl);
if (error)
goto out;
error = gfs2_inode_get(gl, &inum, CREATE, ipp);
if (!error)
gfs2_inode_min_init(*ipp, type);
gfs2_glock_put(gl);
out:
gfs2_glock_dq_uninit(&d_gh);
return error;
}
static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino)
{
struct gfs2_inode *ip = sdp->sd_ir_inode;
struct buffer_head *bh;
struct gfs2_inum_range ir;
int error;
error = gfs2_trans_begin(sdp, RES_DINODE, 0);
if (error)
return error;
down(&sdp->sd_inum_mutex);
error = gfs2_meta_inode_buffer(ip, &bh);
if (error) {
up(&sdp->sd_inum_mutex);
gfs2_trans_end(sdp);
return error;
}
gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
if (ir.ir_length) {
*formal_ino = ir.ir_start++;
ir.ir_length--;
gfs2_trans_add_bh(ip->i_gl, bh, 1);
gfs2_inum_range_out(&ir,
bh->b_data + sizeof(struct gfs2_dinode));
brelse(bh);
up(&sdp->sd_inum_mutex);
gfs2_trans_end(sdp);
return 0;
}
brelse(bh);
up(&sdp->sd_inum_mutex);
gfs2_trans_end(sdp);
return 1;
}
static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino)
{
struct gfs2_inode *ip = sdp->sd_ir_inode;
struct gfs2_inode *m_ip = sdp->sd_inum_inode;
struct gfs2_holder gh;
struct buffer_head *bh;
struct gfs2_inum_range ir;
int error;
error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
if (error)
return error;
error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
if (error)
goto out;
down(&sdp->sd_inum_mutex);
error = gfs2_meta_inode_buffer(ip, &bh);
if (error)
goto out_end_trans;
gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
if (!ir.ir_length) {
struct buffer_head *m_bh;
uint64_t x, y;
error = gfs2_meta_inode_buffer(m_ip, &m_bh);
if (error)
goto out_brelse;
x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode));
x = y = be64_to_cpu(x);
ir.ir_start = x;
ir.ir_length = GFS2_INUM_QUANTUM;
x += GFS2_INUM_QUANTUM;
if (x < y)
gfs2_consist_inode(m_ip);
x = cpu_to_be64(x);
gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
*(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x;
brelse(m_bh);
}
*formal_ino = ir.ir_start++;
ir.ir_length--;
gfs2_trans_add_bh(ip->i_gl, bh, 1);
gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
out_brelse:
brelse(bh);
out_end_trans:
up(&sdp->sd_inum_mutex);
gfs2_trans_end(sdp);
out:
gfs2_glock_dq_uninit(&gh);
return error;
}
static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum)
{
int error;
error = pick_formal_ino_1(sdp, inum);
if (error <= 0)
return error;
error = pick_formal_ino_2(sdp, inum);
return error;
}
/**
* create_ok - OK to create a new on-disk inode here?
* @dip: Directory in which dinode is to be created
* @name: Name of new dinode
* @mode:
*
* Returns: errno
*/
static int create_ok(struct gfs2_inode *dip, struct qstr *name,
unsigned int mode)
{
int error;
error = gfs2_repermission(dip->i_vnode, MAY_WRITE | MAY_EXEC, NULL);
if (error)
return error;
/* Don't create entries in an unlinked directory */
if (!dip->i_di.di_nlink)
return -EPERM;
error = gfs2_dir_search(dip, name, NULL, NULL);
switch (error) {
case -ENOENT:
error = 0;
break;
case 0:
return -EEXIST;
default:
return error;
}
if (dip->i_di.di_entries == (uint32_t)-1)
return -EFBIG;
if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1)
return -EMLINK;
return 0;
}
static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
unsigned int *uid, unsigned int *gid)
{
if (dip->i_sbd->sd_args.ar_suiddir &&
(dip->i_di.di_mode & S_ISUID) &&
dip->i_di.di_uid) {
if (S_ISDIR(*mode))
*mode |= S_ISUID;
else if (dip->i_di.di_uid != current->fsuid)
*mode &= ~07111;
*uid = dip->i_di.di_uid;
} else
*uid = current->fsuid;
if (dip->i_di.di_mode & S_ISGID) {
if (S_ISDIR(*mode))
*mode |= S_ISGID;
*gid = dip->i_di.di_gid;
} else
*gid = current->fsgid;
}
static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_unlinked *ul)
{
struct gfs2_sbd *sdp = dip->i_sbd;
int error;
gfs2_alloc_get(dip);
dip->i_alloc.al_requested = RES_DINODE;
error = gfs2_inplace_reserve(dip);
if (error)
goto out;
error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_UNLINKED +
RES_STATFS, 0);
if (error)
goto out_ipreserv;
ul->ul_ut.ut_inum.no_addr = gfs2_alloc_di(dip);
ul->ul_ut.ut_flags = GFS2_UTF_UNINIT;
error = gfs2_unlinked_ondisk_add(sdp, ul);
gfs2_trans_end(sdp);
out_ipreserv:
gfs2_inplace_release(dip);
out:
gfs2_alloc_put(dip);
return error;
}
/**
* init_dinode - Fill in a new dinode structure
* @dip: the directory this inode is being created in
* @gl: The glock covering the new inode
* @inum: the inode number
* @mode: the file permissions
* @uid:
* @gid:
*
*/
static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
struct gfs2_inum *inum, unsigned int mode,
unsigned int uid, unsigned int gid)
{
struct gfs2_sbd *sdp = dip->i_sbd;
struct gfs2_dinode *di;
struct buffer_head *dibh;
dibh = gfs2_meta_new(gl, inum->no_addr);
gfs2_trans_add_bh(gl, dibh, 1);
gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
di = (struct gfs2_dinode *)dibh->b_data;
di->di_num = *inum;
di->di_mode = cpu_to_be32(mode);
di->di_uid = cpu_to_be32(uid);
di->di_gid = cpu_to_be32(gid);
di->di_nlink = cpu_to_be32(0);
di->di_size = cpu_to_be64(0);
di->di_blocks = cpu_to_be64(1);
di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
di->di_major = di->di_minor = cpu_to_be32(0);
di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
di->__pad[0] = di->__pad[1] = 0;
di->di_flags = cpu_to_be32(0);
if (S_ISREG(mode)) {
if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
gfs2_tune_get(sdp, gt_new_files_jdata))
di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
gfs2_tune_get(sdp, gt_new_files_directio))
di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
} else if (S_ISDIR(mode)) {
di->di_flags |= cpu_to_be32(dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO);
di->di_flags |= cpu_to_be32(dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA);
}
di->__pad1 = 0;
di->di_height = cpu_to_be32(0);
di->__pad2 = 0;
di->__pad3 = 0;
di->di_depth = cpu_to_be16(0);
di->di_entries = cpu_to_be32(0);
memset(&di->__pad4, 0, sizeof(di->__pad4));
di->di_eattr = cpu_to_be64(0);
memset(&di->di_reserved, 0, sizeof(di->di_reserved));
brelse(dibh);
}
static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
unsigned int mode, struct gfs2_unlinked *ul)
{
struct gfs2_sbd *sdp = dip->i_sbd;
unsigned int uid, gid;
int error;
munge_mode_uid_gid(dip, &mode, &uid, &gid);
gfs2_alloc_get(dip);
error = gfs2_quota_lock(dip, uid, gid);
if (error)
goto out;
error = gfs2_quota_check(dip, uid, gid);
if (error)
goto out_quota;
error = gfs2_trans_begin(sdp, RES_DINODE + RES_UNLINKED +
RES_QUOTA, 0);
if (error)
goto out_quota;
ul->ul_ut.ut_flags = 0;
error = gfs2_unlinked_ondisk_munge(sdp, ul);
init_dinode(dip, gl, &ul->ul_ut.ut_inum,
mode, uid, gid);
gfs2_quota_change(dip, +1, uid, gid);
gfs2_trans_end(sdp);
out_quota:
gfs2_quota_unlock(dip);
out:
gfs2_alloc_put(dip);
return error;
}
static int link_dinode(struct gfs2_inode *dip, struct qstr *name,
struct gfs2_inode *ip, struct gfs2_unlinked *ul)
{
struct gfs2_sbd *sdp = dip->i_sbd;
struct gfs2_alloc *al;
int alloc_required;
struct buffer_head *dibh;
int error;
al = gfs2_alloc_get(dip);
error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
goto fail;
error = gfs2_diradd_alloc_required(dip, name, &alloc_required);
if (alloc_required) {
error = gfs2_quota_check(dip, dip->i_di.di_uid,
dip->i_di.di_gid);
if (error)
goto fail_quota_locks;
al->al_requested = sdp->sd_max_dirres;
error = gfs2_inplace_reserve(dip);
if (error)
goto fail_quota_locks;
error = gfs2_trans_begin(sdp,
sdp->sd_max_dirres +
al->al_rgd->rd_ri.ri_length +
2 * RES_DINODE + RES_UNLINKED +
RES_STATFS + RES_QUOTA, 0);
if (error)
goto fail_ipreserv;
} else {
error = gfs2_trans_begin(sdp,
RES_LEAF +
2 * RES_DINODE +
RES_UNLINKED, 0);
if (error)
goto fail_quota_locks;
}
error = gfs2_dir_add(dip, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
if (error)
goto fail_end_trans;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
goto fail_end_trans;
ip->i_di.di_nlink = 1;
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
gfs2_dinode_out(&ip->i_di, dibh->b_data);
brelse(dibh);
error = gfs2_unlinked_ondisk_rm(sdp, ul);
if (error)
goto fail_end_trans;
return 0;
fail_end_trans:
gfs2_trans_end(sdp);
fail_ipreserv:
if (dip->i_alloc.al_rgd)
gfs2_inplace_release(dip);
fail_quota_locks:
gfs2_quota_unlock(dip);
fail:
gfs2_alloc_put(dip);
return error;
}
/**
* gfs2_createi - Create a new inode
* @ghs: An array of two holders
* @name: The name of the new file
* @mode: the permissions on the new inode
*
* @ghs[0] is an initialized holder for the directory
* @ghs[1] is the holder for the inode lock
*
* If the return value is 0, the glocks on both the directory and the new
* file are held. A transaction has been started and an inplace reservation
* is held, as well.
*
* Returns: errno
*/
int gfs2_createi(struct gfs2_holder *ghs, struct qstr *name, unsigned int mode)
{
struct gfs2_inode *dip = get_gl2ip(ghs->gh_gl);
struct gfs2_sbd *sdp = dip->i_sbd;
struct gfs2_unlinked *ul;
struct gfs2_inode *ip;
int error;
if (!name->len || name->len > GFS2_FNAMESIZE)
return -ENAMETOOLONG;
error = gfs2_unlinked_get(sdp, &ul);
if (error)
return error;
gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
error = gfs2_glock_nq(ghs);
if (error)
goto fail;
error = create_ok(dip, name, mode);
if (error)
goto fail_gunlock;
error = pick_formal_ino(sdp, &ul->ul_ut.ut_inum.no_formal_ino);
if (error)
goto fail_gunlock;
error = alloc_dinode(dip, ul);
if (error)
goto fail_gunlock;
if (ul->ul_ut.ut_inum.no_addr < dip->i_num.no_addr) {
gfs2_glock_dq(ghs);
error = gfs2_glock_nq_num(sdp,
ul->ul_ut.ut_inum.no_addr,
&gfs2_inode_glops,
LM_ST_EXCLUSIVE, GL_SKIP,
ghs + 1);
if (error) {
gfs2_unlinked_put(sdp, ul);
return error;
}
gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
error = gfs2_glock_nq(ghs);
if (error) {
gfs2_glock_dq_uninit(ghs + 1);
gfs2_unlinked_put(sdp, ul);
return error;
}
error = create_ok(dip, name, mode);
if (error)
goto fail_gunlock2;
} else {
error = gfs2_glock_nq_num(sdp,
ul->ul_ut.ut_inum.no_addr,
&gfs2_inode_glops,
LM_ST_EXCLUSIVE, GL_SKIP,
ghs + 1);
if (error)
goto fail_gunlock;
}
error = make_dinode(dip, ghs[1].gh_gl, mode, ul);
if (error)
goto fail_gunlock2;
error = gfs2_inode_get(ghs[1].gh_gl, &ul->ul_ut.ut_inum, CREATE, &ip);
if (error)
goto fail_gunlock2;
error = gfs2_inode_refresh(ip);
if (error)
goto fail_iput;
error = gfs2_acl_create(dip, ip);
if (error)
goto fail_iput;
error = link_dinode(dip, name, ip, ul);
if (error)
goto fail_iput;
gfs2_unlinked_put(sdp, ul);
return 0;
fail_iput:
gfs2_inode_put(ip);
fail_gunlock2:
gfs2_glock_dq_uninit(ghs + 1);
fail_gunlock:
gfs2_glock_dq(ghs);
fail:
gfs2_unlinked_put(sdp, ul);
return error;
}
/**
* gfs2_unlinki - Unlink a file
* @dip: The inode of the directory
* @name: The name of the file to be unlinked
* @ip: The inode of the file to be removed
*
* Assumes Glocks on both dip and ip are held.
*
* Returns: errno
*/
int gfs2_unlinki(struct gfs2_inode *dip, struct qstr *name,
struct gfs2_inode *ip, struct gfs2_unlinked *ul)
{
struct gfs2_sbd *sdp = dip->i_sbd;
int error;
error = gfs2_dir_del(dip, name);
if (error)
return error;
error = gfs2_change_nlink(ip, -1);
if (error)
return error;
/* If this inode is being unlinked from the directory structure,
we need to mark that in the log so that it isn't lost during
a crash. */
if (!ip->i_di.di_nlink) {
ul->ul_ut.ut_inum = ip->i_num;
error = gfs2_unlinked_ondisk_add(sdp, ul);
if (!error)
set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
}
return error;
}
/**
* gfs2_rmdiri - Remove a directory
* @dip: The parent directory of the directory to be removed
* @name: The name of the directory to be removed
* @ip: The GFS2 inode of the directory to be removed
*
* Assumes Glocks on dip and ip are held
*
* Returns: errno
*/
int gfs2_rmdiri(struct gfs2_inode *dip, struct qstr *name,
struct gfs2_inode *ip, struct gfs2_unlinked *ul)
{
struct gfs2_sbd *sdp = dip->i_sbd;
struct qstr dotname;
int error;
if (ip->i_di.di_entries != 2) {
if (gfs2_consist_inode(ip))
gfs2_dinode_print(&ip->i_di);
return -EIO;
}
error = gfs2_dir_del(dip, name);
if (error)
return error;
error = gfs2_change_nlink(dip, -1);
if (error)
return error;
dotname.len = 1;
dotname.name = ".";
error = gfs2_dir_del(ip, &dotname);
if (error)
return error;
dotname.len = 2;
dotname.name = "..";
error = gfs2_dir_del(ip, &dotname);
if (error)
return error;
error = gfs2_change_nlink(ip, -2);
if (error)
return error;
/* This inode is being unlinked from the directory structure and
we need to mark that in the log so that it isn't lost during
a crash. */
ul->ul_ut.ut_inum = ip->i_num;
error = gfs2_unlinked_ondisk_add(sdp, ul);
if (!error)
set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
return error;
}
/*
* gfs2_unlink_ok - check to see that a inode is still in a directory
* @dip: the directory
* @name: the name of the file
* @ip: the inode
*
* Assumes that the lock on (at least) @dip is held.
*
* Returns: 0 if the parent/child relationship is correct, errno if it isn't
*/
int gfs2_unlink_ok(struct gfs2_inode *dip, struct qstr *name,
struct gfs2_inode *ip)
{
struct gfs2_inum inum;
unsigned int type;
int error;
if (IS_IMMUTABLE(ip->i_vnode) || IS_APPEND(ip->i_vnode))
return -EPERM;
if ((dip->i_di.di_mode & S_ISVTX) &&
dip->i_di.di_uid != current->fsuid &&
ip->i_di.di_uid != current->fsuid &&
!capable(CAP_FOWNER))
return -EPERM;
if (IS_APPEND(dip->i_vnode))
return -EPERM;
error = gfs2_repermission(dip->i_vnode, MAY_WRITE | MAY_EXEC, NULL);
if (error)
return error;
error = gfs2_dir_search(dip, name, &inum, &type);
if (error)
return error;
if (!gfs2_inum_equal(&inum, &ip->i_num))
return -ENOENT;
if (IF2DT(ip->i_di.di_mode) != type) {
gfs2_consist_inode(dip);
return -EIO;
}
return 0;
}
/*
* gfs2_ok_to_move - check if it's ok to move a directory to another directory
* @this: move this
* @to: to here
*
* Follow @to back to the root and make sure we don't encounter @this
* Assumes we already hold the rename lock.
*
* Returns: errno
*/
int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
{
struct gfs2_sbd *sdp = this->i_sbd;
struct gfs2_inode *tmp;
struct qstr dotdot;
int error = 0;
memset(&dotdot, 0, sizeof(struct qstr));
dotdot.name = "..";
dotdot.len = 2;
gfs2_inode_hold(to);
for (;;) {
if (to == this) {
error = -EINVAL;
break;
}
if (to == sdp->sd_root_dir) {
error = 0;
break;
}
error = gfs2_lookupi(to, &dotdot, 1, &tmp);
if (error)
break;
gfs2_inode_put(to);
to = tmp;
}
gfs2_inode_put(to);
return error;
}
/**
* gfs2_readlinki - return the contents of a symlink
* @ip: the symlink's inode
* @buf: a pointer to the buffer to be filled
* @len: a pointer to the length of @buf
*
* If @buf is too small, a piece of memory is kmalloc()ed and needs
* to be freed by the caller.
*
* Returns: errno
*/
int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
{
struct gfs2_holder i_gh;
struct buffer_head *dibh;
unsigned int x;
int error;
gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
error = gfs2_glock_nq_atime(&i_gh);
if (error) {
gfs2_holder_uninit(&i_gh);
return error;
}
if (!ip->i_di.di_size) {
gfs2_consist_inode(ip);
error = -EIO;
goto out;
}
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
goto out;
x = ip->i_di.di_size + 1;
if (x > *len) {
*buf = kmalloc(x, GFP_KERNEL);
if (!*buf) {
error = -ENOMEM;
goto out_brelse;
}
}
memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
*len = x;
out_brelse:
brelse(dibh);
out:
gfs2_glock_dq_uninit(&i_gh);
return error;
}
/**
* gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
* conditionally update the inode's atime
* @gh: the holder to acquire
*
* Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
* Update if the difference between the current time and the inode's current
* atime is greater than an interval specified at mount.
*
* Returns: errno
*/
int gfs2_glock_nq_atime(struct gfs2_holder *gh)
{
struct gfs2_glock *gl = gh->gh_gl;
struct gfs2_sbd *sdp = gl->gl_sbd;
struct gfs2_inode *ip = get_gl2ip(gl);
int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
unsigned int state;
int flags;
int error;
if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
return -EINVAL;
state = gh->gh_state;
flags = gh->gh_flags;
error = gfs2_glock_nq(gh);
if (error)
return error;
if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
(sdp->sd_vfs->s_flags & MS_RDONLY))
return 0;
curtime = get_seconds();
if (curtime - ip->i_di.di_atime >= quantum) {
gfs2_glock_dq(gh);
gfs2_holder_reinit(LM_ST_EXCLUSIVE,
gh->gh_flags & ~LM_FLAG_ANY,
gh);
error = gfs2_glock_nq(gh);
if (error)
return error;
/* Verify that atime hasn't been updated while we were
trying to get exclusive lock. */
curtime = get_seconds();
if (curtime - ip->i_di.di_atime >= quantum) {
struct buffer_head *dibh;
error = gfs2_trans_begin(sdp, RES_DINODE, 0);
if (error == -EROFS)
return 0;
if (error)
goto fail;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
goto fail_end_trans;
ip->i_di.di_atime = curtime;
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
gfs2_dinode_out(&ip->i_di, dibh->b_data);
brelse(dibh);
gfs2_trans_end(sdp);
}
/* If someone else has asked for the glock,
unlock and let them have it. Then reacquire
in the original state. */
if (gfs2_glock_is_blocking(gl)) {
gfs2_glock_dq(gh);
gfs2_holder_reinit(state, flags, gh);
return gfs2_glock_nq(gh);
}
}
return 0;
fail_end_trans:
gfs2_trans_end(sdp);
fail:
gfs2_glock_dq(gh);
return error;
}
/**
* glock_compare_atime - Compare two struct gfs2_glock structures for sort
* @arg_a: the first structure
* @arg_b: the second structure
*
* Returns: 1 if A > B
* -1 if A < B
* 0 if A = B
*/
static int glock_compare_atime(const void *arg_a, const void *arg_b)
{
struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a;
struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b;
struct lm_lockname *a = &gh_a->gh_gl->gl_name;
struct lm_lockname *b = &gh_b->gh_gl->gl_name;
int ret = 0;
if (a->ln_number > b->ln_number)
ret = 1;
else if (a->ln_number < b->ln_number)
ret = -1;
else {
if (gh_a->gh_state == LM_ST_SHARED &&
gh_b->gh_state == LM_ST_EXCLUSIVE)
ret = 1;
else if (gh_a->gh_state == LM_ST_SHARED &&
(gh_b->gh_flags & GL_ATIME))
ret = 1;
}
return ret;
}
/**
* gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
* atime update
* @num_gh: the number of structures
* @ghs: an array of struct gfs2_holder structures
*
* Returns: 0 on success (all glocks acquired),
* errno on failure (no glocks acquired)
*/
int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
{
struct gfs2_holder **p;
unsigned int x;
int error = 0;
if (!num_gh)
return 0;
if (num_gh == 1) {
ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
if (ghs->gh_flags & GL_ATIME)
error = gfs2_glock_nq_atime(ghs);
else
error = gfs2_glock_nq(ghs);
return error;
}
p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
if (!p)
return -ENOMEM;
for (x = 0; x < num_gh; x++)
p[x] = &ghs[x];
sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
for (x = 0; x < num_gh; x++) {
p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
if (p[x]->gh_flags & GL_ATIME)
error = gfs2_glock_nq_atime(p[x]);
else
error = gfs2_glock_nq(p[x]);
if (error) {
while (x--)
gfs2_glock_dq(p[x]);
break;
}
}
kfree(p);
return error;
}
/**
* gfs2_try_toss_vnode - See if we can toss a vnode from memory
* @ip: the inode
*
* Returns: 1 if the vnode was tossed
*/
void gfs2_try_toss_vnode(struct gfs2_inode *ip)
{
struct inode *inode;
inode = gfs2_ip2v_lookup(ip);
if (!inode)
return;
d_prune_aliases(inode);
if (S_ISDIR(ip->i_di.di_mode)) {
struct list_head *head = &inode->i_dentry;
struct dentry *d = NULL;
spin_lock(&dcache_lock);
if (list_empty(head))
spin_unlock(&dcache_lock);
else {
d = list_entry(head->next, struct dentry, d_alias);
dget_locked(d);
spin_unlock(&dcache_lock);
if (have_submounts(d))
dput(d);
else {
shrink_dcache_parent(d);
dput(d);
d_prune_aliases(inode);
}
}
}
inode->i_nlink = 0;
iput(inode);
}
static int
__gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
{
struct buffer_head *dibh;
int error;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (!error) {
error = inode_setattr(ip->i_vnode, attr);
gfs2_assert_warn(ip->i_sbd, !error);
gfs2_inode_attr_out(ip);
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
gfs2_dinode_out(&ip->i_di, dibh->b_data);
brelse(dibh);
}
return error;
}
/**
* gfs2_setattr_simple -
* @ip:
* @attr:
*
* Called with a reference on the vnode.
*
* Returns: errno
*/
int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
{
int error;
if (get_transaction)
return __gfs2_setattr_simple(ip, attr);
error = gfs2_trans_begin(ip->i_sbd, RES_DINODE, 0);
if (error)
return error;
error = __gfs2_setattr_simple(ip, attr);
gfs2_trans_end(ip->i_sbd);
return error;
}
int gfs2_repermission(struct inode *inode, int mask, struct nameidata *nd)
{
return permission(inode, mask, nd);
}
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