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linux/fs/gfs2/ops_inode.c
Steven Whitehouse 7359a19cc7 [GFS2] Fix for root inode ref count bug 
Umount is now working correctly again. The bug was due to
not getting an extra ref count when mounting the fs. We
should have bumped it by two (once for the internal pointer
to the root inode from the super block and once for the
inode hanging off the dcache entry for root).

Also this patch tidys up the code dealing with looking up
and creating inodes. We now pass Linux inodes (with gfs2_inodes
attached) rather than the other way around and this reduces code
duplication in various places.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2006-02-13 12:27:43 +00:00

1235 lines
27 KiB
C
Raw Blame History

/*
* 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/namei.h>
#include <linux/utsname.h>
#include <linux/mm.h>
#include <linux/xattr.h>
#include <linux/posix_acl.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>
#include "gfs2.h"
#include "acl.h"
#include "bmap.h"
#include "dir.h"
#include "eaops.h"
#include "eattr.h"
#include "glock.h"
#include "inode.h"
#include "meta_io.h"
#include "ops_dentry.h"
#include "ops_inode.h"
#include "page.h"
#include "quota.h"
#include "rgrp.h"
#include "trans.h"
#include "unlinked.h"
/**
* gfs2_create - Create a file
* @dir: The directory in which to create the file
* @dentry: The dentry of the new file
* @mode: The mode of the new file
*
* Returns: errno
*/
static int gfs2_create(struct inode *dir, struct dentry *dentry,
int mode, struct nameidata *nd)
{
struct gfs2_inode *dip = get_v2ip(dir);
struct gfs2_sbd *sdp = dip->i_sbd;
struct gfs2_holder ghs[2];
struct inode *inode;
int new = 1;
int error;
atomic_inc(&sdp->sd_ops_inode);
gfs2_holder_init(dip->i_gl, 0, 0, ghs);
for (;;) {
inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode);
if (!IS_ERR(inode)) {
gfs2_trans_end(sdp);
if (dip->i_alloc.al_rgd)
gfs2_inplace_release(dip);
gfs2_quota_unlock(dip);
gfs2_alloc_put(dip);
gfs2_glock_dq_uninit_m(2, ghs);
break;
} else if (PTR_ERR(inode) != -EEXIST ||
(nd->intent.open.flags & O_EXCL)) {
gfs2_holder_uninit(ghs);
return PTR_ERR(inode);
}
error = gfs2_lookupi(dir, &dentry->d_name, 0, &inode);
if (!error) {
new = 0;
gfs2_holder_uninit(ghs);
break;
} else if (error != -ENOENT) {
gfs2_holder_uninit(ghs);
return error;
}
}
d_instantiate(dentry, inode);
if (new)
mark_inode_dirty(inode);
return 0;
}
/**
* gfs2_lookup - Look up a filename in a directory and return its inode
* @dir: The directory inode
* @dentry: The dentry of the new inode
* @nd: passed from Linux VFS, ignored by us
*
* Called by the VFS layer. Lock dir and call gfs2_lookupi()
*
* Returns: errno
*/
static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
struct gfs2_inode *dip = get_v2ip(dir);
struct gfs2_sbd *sdp = dip->i_sbd;
struct inode *inode = NULL;
int error;
atomic_inc(&sdp->sd_ops_inode);
if (!sdp->sd_args.ar_localcaching)
dentry->d_op = &gfs2_dops;
error = gfs2_lookupi(dir, &dentry->d_name, 0, &inode);
if (error && error != -ENOENT)
return ERR_PTR(error);
if (inode)
return d_splice_alias(inode, dentry);
d_add(dentry, inode);
return NULL;
}
/**
* gfs2_link - Link to a file
* @old_dentry: The inode to link
* @dir: Add link to this directory
* @dentry: The name of the link
*
* Link the inode in "old_dentry" into the directory "dir" with the
* name in "dentry".
*
* Returns: errno
*/
static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
struct dentry *dentry)
{
struct gfs2_inode *dip = get_v2ip(dir);
struct gfs2_sbd *sdp = dip->i_sbd;
struct inode *inode = old_dentry->d_inode;
struct gfs2_inode *ip = get_v2ip(inode);
struct gfs2_holder ghs[2];
int alloc_required;
int error;
atomic_inc(&sdp->sd_ops_inode);
if (S_ISDIR(ip->i_di.di_mode))
return -EPERM;
gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
error = gfs2_glock_nq_m(2, ghs);
if (error)
goto out;
error = gfs2_repermission(dir, MAY_WRITE | MAY_EXEC, NULL);
if (error)
goto out_gunlock;
error = gfs2_dir_search(dip, &dentry->d_name, NULL, NULL);
switch (error) {
case -ENOENT:
break;
case 0:
error = -EEXIST;
default:
goto out_gunlock;
}
error = -EINVAL;
if (!dip->i_di.di_nlink)
goto out_gunlock;
error = -EFBIG;
if (dip->i_di.di_entries == (uint32_t)-1)
goto out_gunlock;
error = -EPERM;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
goto out_gunlock;
error = -EINVAL;
if (!ip->i_di.di_nlink)
goto out_gunlock;
error = -EMLINK;
if (ip->i_di.di_nlink == (uint32_t)-1)
goto out_gunlock;
error = gfs2_diradd_alloc_required(dip, &dentry->d_name,
&alloc_required);
if (error)
goto out_gunlock;
if (alloc_required) {
struct gfs2_alloc *al = gfs2_alloc_get(dip);
error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
goto out_alloc;
error = gfs2_quota_check(dip, dip->i_di.di_uid,
dip->i_di.di_gid);
if (error)
goto out_gunlock_q;
al->al_requested = sdp->sd_max_dirres;
error = gfs2_inplace_reserve(dip);
if (error)
goto out_gunlock_q;
error = gfs2_trans_begin(sdp,
sdp->sd_max_dirres +
al->al_rgd->rd_ri.ri_length +
2 * RES_DINODE + RES_STATFS +
RES_QUOTA, 0);
if (error)
goto out_ipres;
} else {
error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
if (error)
goto out_ipres;
}
error = gfs2_dir_add(dip, &dentry->d_name, &ip->i_num,
IF2DT(ip->i_di.di_mode));
if (error)
goto out_end_trans;
error = gfs2_change_nlink(ip, +1);
out_end_trans:
gfs2_trans_end(sdp);
out_ipres:
if (alloc_required)
gfs2_inplace_release(dip);
out_gunlock_q:
if (alloc_required)
gfs2_quota_unlock(dip);
out_alloc:
if (alloc_required)
gfs2_alloc_put(dip);
out_gunlock:
gfs2_glock_dq_m(2, ghs);
out:
gfs2_holder_uninit(ghs);
gfs2_holder_uninit(ghs + 1);
if (!error) {
atomic_inc(&inode->i_count);
d_instantiate(dentry, inode);
mark_inode_dirty(inode);
}
return error;
}
/**
* gfs2_unlink - Unlink a file
* @dir: The inode of the directory containing the file to unlink
* @dentry: The file itself
*
* Unlink a file. Call gfs2_unlinki()
*
* Returns: errno
*/
static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
{
struct gfs2_inode *dip = get_v2ip(dir);
struct gfs2_sbd *sdp = dip->i_sbd;
struct gfs2_inode *ip = get_v2ip(dentry->d_inode);
struct gfs2_unlinked *ul;
struct gfs2_holder ghs[2];
int error;
atomic_inc(&sdp->sd_ops_inode);
error = gfs2_unlinked_get(sdp, &ul);
if (error)
return error;
gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
error = gfs2_glock_nq_m(2, ghs);
if (error)
goto out;
error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
if (error)
goto out_gunlock;
error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF +
RES_UNLINKED, 0);
if (error)
goto out_gunlock;
error = gfs2_unlinki(dip, &dentry->d_name, ip,ul);
gfs2_trans_end(sdp);
out_gunlock:
gfs2_glock_dq_m(2, ghs);
out:
gfs2_holder_uninit(ghs);
gfs2_holder_uninit(ghs + 1);
gfs2_unlinked_put(sdp, ul);
return error;
}
/**
* gfs2_symlink - Create a symlink
* @dir: The directory to create the symlink in
* @dentry: The dentry to put the symlink in
* @symname: The thing which the link points to
*
* Returns: errno
*/
static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
const char *symname)
{
struct gfs2_inode *dip = get_v2ip(dir), *ip;
struct gfs2_sbd *sdp = dip->i_sbd;
struct gfs2_holder ghs[2];
struct inode *inode;
struct buffer_head *dibh;
int size;
int error;
atomic_inc(&sdp->sd_ops_inode);
/* Must be stuffed with a null terminator for gfs2_follow_link() */
size = strlen(symname);
if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
return -ENAMETOOLONG;
gfs2_holder_init(dip->i_gl, 0, 0, ghs);
inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO);
if (IS_ERR(inode)) {
gfs2_holder_uninit(ghs);
return PTR_ERR(inode);
}
ip = get_gl2ip(ghs[1].gh_gl);
ip->i_di.di_size = size;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (!gfs2_assert_withdraw(sdp, !error)) {
gfs2_dinode_out(&ip->i_di, dibh->b_data);
memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
size);
brelse(dibh);
}
gfs2_trans_end(sdp);
if (dip->i_alloc.al_rgd)
gfs2_inplace_release(dip);
gfs2_quota_unlock(dip);
gfs2_alloc_put(dip);
gfs2_glock_dq_uninit_m(2, ghs);
d_instantiate(dentry, inode);
mark_inode_dirty(inode);
return 0;
}
/**
* gfs2_mkdir - Make a directory
* @dir: The parent directory of the new one
* @dentry: The dentry of the new directory
* @mode: The mode of the new directory
*
* Returns: errno
*/
static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
struct gfs2_inode *dip = get_v2ip(dir), *ip;
struct gfs2_sbd *sdp = dip->i_sbd;
struct gfs2_holder ghs[2];
struct inode *inode;
struct buffer_head *dibh;
int error;
atomic_inc(&sdp->sd_ops_inode);
gfs2_holder_init(dip->i_gl, 0, 0, ghs);
inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode);
if (IS_ERR(inode)) {
gfs2_holder_uninit(ghs);
return PTR_ERR(inode);
}
ip = get_gl2ip(ghs[1].gh_gl);
ip->i_di.di_nlink = 2;
ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
ip->i_di.di_flags |= GFS2_DIF_JDATA;
ip->i_di.di_payload_format = GFS2_FORMAT_DE;
ip->i_di.di_entries = 2;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (!gfs2_assert_withdraw(sdp, !error)) {
struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
struct gfs2_dirent *dent;
gfs2_dirent_alloc(ip, dibh, 1, &dent);
dent->de_inum = di->di_num; /* already GFS2 endian */
dent->de_hash = gfs2_disk_hash(".", 1);
dent->de_hash = cpu_to_be32(dent->de_hash);
dent->de_type = DT_DIR;
memcpy((char *) (dent + 1), ".", 1);
di->di_entries = cpu_to_be32(1);
gfs2_dirent_alloc(ip, dibh, 2, &dent);
gfs2_inum_out(&dip->i_num, (char *) &dent->de_inum);
dent->de_hash = gfs2_disk_hash("..", 2);
dent->de_hash = cpu_to_be32(dent->de_hash);
dent->de_type = DT_DIR;
memcpy((char *) (dent + 1), "..", 2);
gfs2_dinode_out(&ip->i_di, (char *)di);
brelse(dibh);
}
error = gfs2_change_nlink(dip, +1);
gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
gfs2_trans_end(sdp);
if (dip->i_alloc.al_rgd)
gfs2_inplace_release(dip);
gfs2_quota_unlock(dip);
gfs2_alloc_put(dip);
gfs2_glock_dq_uninit_m(2, ghs);
d_instantiate(dentry, inode);
mark_inode_dirty(inode);
return 0;
}
/**
* gfs2_rmdir - Remove a directory
* @dir: The parent directory of the directory to be removed
* @dentry: The dentry of the directory to remove
*
* Remove a directory. Call gfs2_rmdiri()
*
* Returns: errno
*/
static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
{
struct gfs2_inode *dip = get_v2ip(dir);
struct gfs2_sbd *sdp = dip->i_sbd;
struct gfs2_inode *ip = get_v2ip(dentry->d_inode);
struct gfs2_unlinked *ul;
struct gfs2_holder ghs[2];
int error;
atomic_inc(&sdp->sd_ops_inode);
error = gfs2_unlinked_get(sdp, &ul);
if (error)
return error;
gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
error = gfs2_glock_nq_m(2, ghs);
if (error)
goto out;
error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
if (error)
goto out_gunlock;
if (ip->i_di.di_entries < 2) {
if (gfs2_consist_inode(ip))
gfs2_dinode_print(&ip->i_di);
error = -EIO;
goto out_gunlock;
}
if (ip->i_di.di_entries > 2) {
error = -ENOTEMPTY;
goto out_gunlock;
}
error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF +
RES_UNLINKED, 0);
if (error)
goto out_gunlock;
error = gfs2_rmdiri(dip, &dentry->d_name, ip, ul);
gfs2_trans_end(sdp);
out_gunlock:
gfs2_glock_dq_m(2, ghs);
out:
gfs2_holder_uninit(ghs);
gfs2_holder_uninit(ghs + 1);
gfs2_unlinked_put(sdp, ul);
return error;
}
/**
* gfs2_mknod - Make a special file
* @dir: The directory in which the special file will reside
* @dentry: The dentry of the special file
* @mode: The mode of the special file
* @rdev: The device specification of the special file
*
*/
static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
dev_t dev)
{
struct gfs2_inode *dip = get_v2ip(dir), *ip;
struct gfs2_sbd *sdp = dip->i_sbd;
struct gfs2_holder ghs[2];
struct inode *inode;
struct buffer_head *dibh;
uint32_t major = 0, minor = 0;
int error;
atomic_inc(&sdp->sd_ops_inode);
switch (mode & S_IFMT) {
case S_IFBLK:
case S_IFCHR:
major = MAJOR(dev);
minor = MINOR(dev);
break;
case S_IFIFO:
case S_IFSOCK:
break;
default:
return -EOPNOTSUPP;
};
gfs2_holder_init(dip->i_gl, 0, 0, ghs);
inode = gfs2_createi(ghs, &dentry->d_name, mode);
if (IS_ERR(inode)) {
gfs2_holder_uninit(ghs);
return PTR_ERR(inode);
}
ip = get_gl2ip(ghs[1].gh_gl);
ip->i_di.di_major = major;
ip->i_di.di_minor = minor;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (!gfs2_assert_withdraw(sdp, !error)) {
gfs2_dinode_out(&ip->i_di, dibh->b_data);
brelse(dibh);
}
gfs2_trans_end(sdp);
if (dip->i_alloc.al_rgd)
gfs2_inplace_release(dip);
gfs2_quota_unlock(dip);
gfs2_alloc_put(dip);
gfs2_glock_dq_uninit_m(2, ghs);
d_instantiate(dentry, inode);
mark_inode_dirty(inode);
return 0;
}
/**
* gfs2_rename - Rename a file
* @odir: Parent directory of old file name
* @odentry: The old dentry of the file
* @ndir: Parent directory of new file name
* @ndentry: The new dentry of the file
*
* Returns: errno
*/
static int gfs2_rename(struct inode *odir, struct dentry *odentry,
struct inode *ndir, struct dentry *ndentry)
{
struct gfs2_inode *odip = get_v2ip(odir);
struct gfs2_inode *ndip = get_v2ip(ndir);
struct gfs2_inode *ip = get_v2ip(odentry->d_inode);
struct gfs2_inode *nip = NULL;
struct gfs2_sbd *sdp = odip->i_sbd;
struct gfs2_unlinked *ul;
struct gfs2_holder ghs[4], r_gh;
unsigned int num_gh;
int dir_rename = 0;
int alloc_required;
unsigned int x;
int error;
atomic_inc(&sdp->sd_ops_inode);
if (ndentry->d_inode) {
nip = get_v2ip(ndentry->d_inode);
if (ip == nip)
return 0;
}
error = gfs2_unlinked_get(sdp, &ul);
if (error)
return error;
/* Make sure we aren't trying to move a dirctory into it's subdir */
if (S_ISDIR(ip->i_di.di_mode) && odip != ndip) {
dir_rename = 1;
error = gfs2_glock_nq_init(sdp->sd_rename_gl,
LM_ST_EXCLUSIVE, 0,
&r_gh);
if (error)
goto out;
error = gfs2_ok_to_move(ip, ndip);
if (error)
goto out_gunlock_r;
}
gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
num_gh = 3;
if (nip)
gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
error = gfs2_glock_nq_m(num_gh, ghs);
if (error)
goto out_uninit;
/* Check out the old directory */
error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
if (error)
goto out_gunlock;
/* Check out the new directory */
if (nip) {
error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
if (error)
goto out_gunlock;
if (S_ISDIR(nip->i_di.di_mode)) {
if (nip->i_di.di_entries < 2) {
if (gfs2_consist_inode(nip))
gfs2_dinode_print(&nip->i_di);
error = -EIO;
goto out_gunlock;
}
if (nip->i_di.di_entries > 2) {
error = -ENOTEMPTY;
goto out_gunlock;
}
}
} else {
error = gfs2_repermission(ndir, MAY_WRITE | MAY_EXEC, NULL);
if (error)
goto out_gunlock;
error = gfs2_dir_search(ndip, &ndentry->d_name, NULL, NULL);
switch (error) {
case -ENOENT:
error = 0;
break;
case 0:
error = -EEXIST;
default:
goto out_gunlock;
};
if (odip != ndip) {
if (!ndip->i_di.di_nlink) {
error = -EINVAL;
goto out_gunlock;
}
if (ndip->i_di.di_entries == (uint32_t)-1) {
error = -EFBIG;
goto out_gunlock;
}
if (S_ISDIR(ip->i_di.di_mode) &&
ndip->i_di.di_nlink == (uint32_t)-1) {
error = -EMLINK;
goto out_gunlock;
}
}
}
/* Check out the dir to be renamed */
if (dir_rename) {
error = gfs2_repermission(odentry->d_inode, MAY_WRITE, NULL);
if (error)
goto out_gunlock;
}
error = gfs2_diradd_alloc_required(ndip, &ndentry->d_name,
&alloc_required);
if (error)
goto out_gunlock;
if (alloc_required) {
struct gfs2_alloc *al = gfs2_alloc_get(ndip);
error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
goto out_alloc;
error = gfs2_quota_check(ndip, ndip->i_di.di_uid,
ndip->i_di.di_gid);
if (error)
goto out_gunlock_q;
al->al_requested = sdp->sd_max_dirres;
error = gfs2_inplace_reserve(ndip);
if (error)
goto out_gunlock_q;
error = gfs2_trans_begin(sdp,
sdp->sd_max_dirres +
al->al_rgd->rd_ri.ri_length +
4 * RES_DINODE + 4 * RES_LEAF +
RES_UNLINKED + RES_STATFS +
RES_QUOTA, 0);
if (error)
goto out_ipreserv;
} else {
error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
5 * RES_LEAF +
RES_UNLINKED, 0);
if (error)
goto out_gunlock;
}
/* Remove the target file, if it exists */
if (nip) {
if (S_ISDIR(nip->i_di.di_mode))
error = gfs2_rmdiri(ndip, &ndentry->d_name, nip, ul);
else
error = gfs2_unlinki(ndip, &ndentry->d_name, nip, ul);
if (error)
goto out_end_trans;
}
if (dir_rename) {
struct qstr name;
name.len = 2;
name.name = "..";
error = gfs2_change_nlink(ndip, +1);
if (error)
goto out_end_trans;
error = gfs2_change_nlink(odip, -1);
if (error)
goto out_end_trans;
error = gfs2_dir_mvino(ip, &name, &ndip->i_num, DT_DIR);
if (error)
goto out_end_trans;
} else {
struct buffer_head *dibh;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
goto out_end_trans;
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);
}
error = gfs2_dir_del(odip, &odentry->d_name);
if (error)
goto out_end_trans;
error = gfs2_dir_add(ndip, &ndentry->d_name, &ip->i_num,
IF2DT(ip->i_di.di_mode));
if (error)
goto out_end_trans;
out_end_trans:
gfs2_trans_end(sdp);
out_ipreserv:
if (alloc_required)
gfs2_inplace_release(ndip);
out_gunlock_q:
if (alloc_required)
gfs2_quota_unlock(ndip);
out_alloc:
if (alloc_required)
gfs2_alloc_put(ndip);
out_gunlock:
gfs2_glock_dq_m(num_gh, ghs);
out_uninit:
for (x = 0; x < num_gh; x++)
gfs2_holder_uninit(ghs + x);
out_gunlock_r:
if (dir_rename)
gfs2_glock_dq_uninit(&r_gh);
out:
gfs2_unlinked_put(sdp, ul);
return error;
}
/**
* gfs2_readlink - Read the value of a symlink
* @dentry: the symlink
* @buf: the buffer to read the symlink data into
* @size: the size of the buffer
*
* Returns: errno
*/
static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
int user_size)
{
struct gfs2_inode *ip = get_v2ip(dentry->d_inode);
char array[GFS2_FAST_NAME_SIZE], *buf = array;
unsigned int len = GFS2_FAST_NAME_SIZE;
int error;
atomic_inc(&ip->i_sbd->sd_ops_inode);
error = gfs2_readlinki(ip, &buf, &len);
if (error)
return error;
if (user_size > len - 1)
user_size = len - 1;
if (copy_to_user(user_buf, buf, user_size))
error = -EFAULT;
else
error = user_size;
if (buf != array)
kfree(buf);
return error;
}
/**
* gfs2_follow_link - Follow a symbolic link
* @dentry: The dentry of the link
* @nd: Data that we pass to vfs_follow_link()
*
* This can handle symlinks of any size. It is optimised for symlinks
* under GFS2_FAST_NAME_SIZE.
*
* Returns: 0 on success or error code
*/
static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct gfs2_inode *ip = get_v2ip(dentry->d_inode);
char array[GFS2_FAST_NAME_SIZE], *buf = array;
unsigned int len = GFS2_FAST_NAME_SIZE;
int error;
atomic_inc(&ip->i_sbd->sd_ops_inode);
error = gfs2_readlinki(ip, &buf, &len);
if (!error) {
error = vfs_follow_link(nd, buf);
if (buf != array)
kfree(buf);
}
return ERR_PTR(error);
}
/**
* gfs2_permission -
* @inode:
* @mask:
* @nd: passed from Linux VFS, ignored by us
*
* Returns: errno
*/
static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
{
struct gfs2_inode *ip = get_v2ip(inode);
struct gfs2_holder i_gh;
int error;
atomic_inc(&ip->i_sbd->sd_ops_inode);
if (ip->i_vn == ip->i_gl->gl_vn)
return generic_permission(inode, mask, gfs2_check_acl);
error = gfs2_glock_nq_init(ip->i_gl,
LM_ST_SHARED, LM_FLAG_ANY,
&i_gh);
if (!error) {
error = generic_permission(inode, mask, gfs2_check_acl_locked);
gfs2_glock_dq_uninit(&i_gh);
}
return error;
}
static int setattr_size(struct inode *inode, struct iattr *attr)
{
struct gfs2_inode *ip = get_v2ip(inode);
int error;
if (attr->ia_size != ip->i_di.di_size) {
error = vmtruncate(inode, attr->ia_size);
if (error)
return error;
}
error = gfs2_truncatei(ip, attr->ia_size);
if (error)
return error;
return error;
}
static int setattr_chown(struct inode *inode, struct iattr *attr)
{
struct gfs2_inode *ip = get_v2ip(inode);
struct gfs2_sbd *sdp = ip->i_sbd;
struct buffer_head *dibh;
uint32_t ouid, ogid, nuid, ngid;
int error;
ouid = ip->i_di.di_uid;
ogid = ip->i_di.di_gid;
nuid = attr->ia_uid;
ngid = attr->ia_gid;
if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
ouid = nuid = NO_QUOTA_CHANGE;
if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
ogid = ngid = NO_QUOTA_CHANGE;
gfs2_alloc_get(ip);
error = gfs2_quota_lock(ip, nuid, ngid);
if (error)
goto out_alloc;
if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
error = gfs2_quota_check(ip, nuid, ngid);
if (error)
goto out_gunlock_q;
}
error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
if (error)
goto out_gunlock_q;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
goto out_end_trans;
error = inode_setattr(inode, attr);
gfs2_assert_warn(sdp, !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);
if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
gfs2_quota_change(ip, -ip->i_di.di_blocks,
ouid, ogid);
gfs2_quota_change(ip, ip->i_di.di_blocks,
nuid, ngid);
}
out_end_trans:
gfs2_trans_end(sdp);
out_gunlock_q:
gfs2_quota_unlock(ip);
out_alloc:
gfs2_alloc_put(ip);
return error;
}
/**
* gfs2_setattr - Change attributes on an inode
* @dentry: The dentry which is changing
* @attr: The structure describing the change
*
* The VFS layer wants to change one or more of an inodes attributes. Write
* that change out to disk.
*
* Returns: errno
*/
static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
struct gfs2_inode *ip = get_v2ip(inode);
struct gfs2_holder i_gh;
int error;
atomic_inc(&ip->i_sbd->sd_ops_inode);
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
if (error)
return error;
error = -EPERM;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
goto out;
error = inode_change_ok(inode, attr);
if (error)
goto out;
if (attr->ia_valid & ATTR_SIZE)
error = setattr_size(inode, attr);
else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
error = setattr_chown(inode, attr);
else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
error = gfs2_acl_chmod(ip, attr);
else
error = gfs2_setattr_simple(ip, attr);
out:
gfs2_glock_dq_uninit(&i_gh);
if (!error)
mark_inode_dirty(inode);
return error;
}
/**
* gfs2_getattr - Read out an inode's attributes
* @mnt: ?
* @dentry: The dentry to stat
* @stat: The inode's stats
*
* Returns: errno
*/
static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat)
{
struct inode *inode = dentry->d_inode;
struct gfs2_inode *ip = get_v2ip(inode);
struct gfs2_holder gh;
int error;
atomic_inc(&ip->i_sbd->sd_ops_inode);
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
if (!error) {
generic_fillattr(inode, stat);
gfs2_glock_dq_uninit(&gh);
}
return error;
}
static int gfs2_setxattr(struct dentry *dentry, const char *name,
const void *data, size_t size, int flags)
{
struct gfs2_inode *ip = get_v2ip(dentry->d_inode);
struct gfs2_ea_request er;
atomic_inc(&ip->i_sbd->sd_ops_inode);
memset(&er, 0, sizeof(struct gfs2_ea_request));
er.er_type = gfs2_ea_name2type(name, &er.er_name);
if (er.er_type == GFS2_EATYPE_UNUSED)
return -EOPNOTSUPP;
er.er_data = (char *)data;
er.er_name_len = strlen(er.er_name);
er.er_data_len = size;
er.er_flags = flags;
gfs2_assert_warn(ip->i_sbd, !(er.er_flags & GFS2_ERF_MODE));
return gfs2_ea_set(ip, &er);
}
static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
void *data, size_t size)
{
struct gfs2_ea_request er;
atomic_inc(&get_v2sdp(dentry->d_inode->i_sb)->sd_ops_inode);
memset(&er, 0, sizeof(struct gfs2_ea_request));
er.er_type = gfs2_ea_name2type(name, &er.er_name);
if (er.er_type == GFS2_EATYPE_UNUSED)
return -EOPNOTSUPP;
er.er_data = data;
er.er_name_len = strlen(er.er_name);
er.er_data_len = size;
return gfs2_ea_get(get_v2ip(dentry->d_inode), &er);
}
static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
struct gfs2_ea_request er;
atomic_inc(&get_v2sdp(dentry->d_inode->i_sb)->sd_ops_inode);
memset(&er, 0, sizeof(struct gfs2_ea_request));
er.er_data = (size) ? buffer : NULL;
er.er_data_len = size;
return gfs2_ea_list(get_v2ip(dentry->d_inode), &er);
}
static int gfs2_removexattr(struct dentry *dentry, const char *name)
{
struct gfs2_ea_request er;
atomic_inc(&get_v2sdp(dentry->d_inode->i_sb)->sd_ops_inode);
memset(&er, 0, sizeof(struct gfs2_ea_request));
er.er_type = gfs2_ea_name2type(name, &er.er_name);
if (er.er_type == GFS2_EATYPE_UNUSED)
return -EOPNOTSUPP;
er.er_name_len = strlen(er.er_name);
return gfs2_ea_remove(get_v2ip(dentry->d_inode), &er);
}
struct inode_operations gfs2_file_iops = {
.permission = gfs2_permission,
.setattr = gfs2_setattr,
.getattr = gfs2_getattr,
.setxattr = gfs2_setxattr,
.getxattr = gfs2_getxattr,
.listxattr = gfs2_listxattr,
.removexattr = gfs2_removexattr,
};
struct inode_operations gfs2_dev_iops = {
.permission = gfs2_permission,
.setattr = gfs2_setattr,
.getattr = gfs2_getattr,
.setxattr = gfs2_setxattr,
.getxattr = gfs2_getxattr,
.listxattr = gfs2_listxattr,
.removexattr = gfs2_removexattr,
};
struct inode_operations gfs2_dir_iops = {
.create = gfs2_create,
.lookup = gfs2_lookup,
.link = gfs2_link,
.unlink = gfs2_unlink,
.symlink = gfs2_symlink,
.mkdir = gfs2_mkdir,
.rmdir = gfs2_rmdir,
.mknod = gfs2_mknod,
.rename = gfs2_rename,
.permission = gfs2_permission,
.setattr = gfs2_setattr,
.getattr = gfs2_getattr,
.setxattr = gfs2_setxattr,
.getxattr = gfs2_getxattr,
.listxattr = gfs2_listxattr,
.removexattr = gfs2_removexattr,
};
struct inode_operations gfs2_symlink_iops = {
.readlink = gfs2_readlink,
.follow_link = gfs2_follow_link,
.permission = gfs2_permission,
.setattr = gfs2_setattr,
.getattr = gfs2_getattr,
.setxattr = gfs2_setxattr,
.getxattr = gfs2_getxattr,
.listxattr = gfs2_listxattr,
.removexattr = gfs2_removexattr,
};
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