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kernel-ark/fs/gfs2/inode.c
Steven Whitehouse c752666c17 [GFS2] Fix bug in directory code and tidy up 
Due to a typo, the dir leaf split operation was (for the first
split in a directory) writing the new hash vaules at the
wrong offset. This is now fixed.

Also some other tidy ups are included:

 - We use GFS2's hash function for dentries (see ops_dentry.c) so that
   we don't have to keep recalculating the hash values.
 - A lot of common code is eliminated between the various directory
   lookup routines.
 - Better error checking on directory lookup (previously different
   routines checked for different errors)
 - The leaf split operation has a couple of redundant operations
   removed from it, so it should be faster.

There is still further scope for further clean ups in the directory
code, and readdir in particular could do with slimming down a bit.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-03-20 12:30:04 -05:00

1861 lines
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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 <linux/gfs2_ondisk.h>
#include <asm/semaphore.h>
#include "gfs2.h"
#include "lm_interface.h"
#include "incore.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"
#include "util.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);
}
tmp->u.generic_ip = 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;
inode->u.generic_ip = 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 = inode->u.generic_ip;
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)
{
if (!test_and_set_bit(GIF_MIN_INIT, &ip->i_flags)) {
ip->i_di.di_nlink = 1;
ip->i_di.di_mode = DT2IF(type);
}
}
/**
* 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;
}
gfs2_dinode_in(&ip->i_di, dibh->b_data);
set_bit(GIF_MIN_INIT, &ip->i_flags);
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, const 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);
io_gl->gl_object = i_gl;
spin_unlock(&io_gl->gl_spin);
gfs2_glock_hold(i_gl);
i_gl->gl_object = 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, const 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 = i_gl->gl_object;
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, io_gl->gl_object == i_gl);
spin_lock(&io_gl->gl_spin);
io_gl->gl_object = 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);
i_gl->gl_object = 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, !i_gh.gh_gl->gl_object);
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;
}
struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
{
struct qstr qstr;
qstr.name = name;
qstr.len = strlen(name);
qstr.hash = gfs2_disk_hash(qstr.name, qstr.len);
return gfs2_lookupi(dip, &qstr, 1, NULL);
}
/**
* 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
*/
struct inode *gfs2_lookupi(struct inode *dir, struct qstr *name, int is_root,
struct nameidata *nd)
{
struct super_block *sb = dir->i_sb;
struct gfs2_inode *ipp;
struct gfs2_inode *dip = dir->u.generic_ip;
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 = 0;
struct inode *inode = NULL;
if (!name->len || name->len > GFS2_FNAMESIZE)
return ERR_PTR(-ENAMETOOLONG);
if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
(name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
dir == sb->s_root->d_inode)) {
gfs2_inode_hold(dip);
ipp = dip;
goto done;
}
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
if (error)
return ERR_PTR(error);
if (!is_root) {
error = gfs2_repermission(dip->i_vnode, MAY_EXEC, NULL);
if (error)
goto out;
}
error = gfs2_dir_search(dir, 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);
done:
if (error == -ENOENT)
return NULL;
if (error == 0) {
inode = gfs2_ip2v(ipp);
gfs2_inode_put(ipp);
if (!inode)
return ERR_PTR(-ENOMEM);
return inode;
}
return ERR_PTR(error);
}
static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino)
{
struct gfs2_inode *ip = sdp->sd_ir_inode->u.generic_ip;
struct buffer_head *bh;
struct gfs2_inum_range ir;
int error;
error = gfs2_trans_begin(sdp, RES_DINODE, 0);
if (error)
return error;
mutex_lock(&sdp->sd_inum_mutex);
error = gfs2_meta_inode_buffer(ip, &bh);
if (error) {
mutex_unlock(&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);
mutex_unlock(&sdp->sd_inum_mutex);
gfs2_trans_end(sdp);
return 0;
}
brelse(bh);
mutex_unlock(&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->u.generic_ip;
struct gfs2_inode *m_ip = sdp->sd_inum_inode->u.generic_ip;
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;
mutex_lock(&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:
mutex_unlock(&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->i_vnode, 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.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
di->di_num.no_addr = cpu_to_be64(inum->no_addr);
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 = alloc_required = gfs2_diradd_alloc_required(dip->i_vnode, name);
if (alloc_required < 0)
goto fail;
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->i_vnode, 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 not NULL, 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: An inode
*/
struct inode *gfs2_createi(struct gfs2_holder *ghs, struct qstr *name,
unsigned int mode)
{
struct inode *inode;
struct gfs2_inode *dip = ghs->gh_gl->gl_object;
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 ERR_PTR(-ENAMETOOLONG);
error = gfs2_unlinked_get(sdp, &ul);
if (error)
return ERR_PTR(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 ERR_PTR(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 ERR_PTR(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);
inode = gfs2_ip2v(ip);
gfs2_inode_put(ip);
if (!inode)
return ERR_PTR(-ENOMEM);
return inode;
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 ERR_PTR(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 = ".";
dotname.hash = gfs2_disk_hash(dotname.name, dotname.len);
error = gfs2_dir_del(ip, &dotname);
if (error)
return error;
dotname.len = 2;
dotname.name = "..";
dotname.hash = gfs2_disk_hash(dotname.name, dotname.len);
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->i_vnode, 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 inode *dir = to->i_vnode;
struct super_block *sb = dir->i_sb;
struct inode *tmp;
struct qstr dotdot;
int error = 0;
memset(&dotdot, 0, sizeof(struct qstr));
dotdot.name = "..";
dotdot.len = 2;
dotdot.hash = gfs2_disk_hash(dotdot.name, dotdot.len);
igrab(dir);
for (;;) {
if (dir == this->i_vnode) {
error = -EINVAL;
break;
}
if (dir == sb->s_root->d_inode) {
error = 0;
break;
}
tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
if (IS_ERR(tmp)) {
error = PTR_ERR(tmp);
break;
}
iput(dir);
dir = tmp;
}
iput(dir);
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 = gl->gl_object;
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 (current->journal_info)
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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