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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/fs/gfs2/inode.c

1254 строки
28 KiB
C
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/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2006 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 version 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 <linux/crc32.h>
#include <linux/lm_interface.h>
#include <linux/security.h>
#include "gfs2.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 "util.h"
static int iget_test(struct inode *inode, void *opaque)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_inum_host *inum = opaque;
if (ip->i_num.no_addr == inum->no_addr)
return 1;
return 0;
}
static int iget_set(struct inode *inode, void *opaque)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_inum_host *inum = opaque;
ip->i_num = *inum;
inode->i_ino = inum->no_addr;
return 0;
}
struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum)
{
return ilookup5(sb, (unsigned long)inum->no_formal_ino,
iget_test, inum);
}
static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum)
{
return iget5_locked(sb, (unsigned long)inum->no_formal_ino,
iget_test, iget_set, inum);
}
/**
* gfs2_inode_lookup - Lookup an inode
* @sb: The super block
* @inum: The inode number
* @type: The type of the inode
*
* Returns: A VFS inode, or an error
*/
struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type)
{
struct inode *inode = gfs2_iget(sb, inum);
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_glock *io_gl;
int error;
if (!inode)
return ERR_PTR(-ENOBUFS);
if (inode->i_state & I_NEW) {
struct gfs2_sbd *sdp = GFS2_SB(inode);
umode_t mode = DT2IF(type);
inode->i_private = ip;
inode->i_mode = mode;
if (S_ISREG(mode)) {
inode->i_op = &gfs2_file_iops;
inode->i_fop = &gfs2_file_fops;
inode->i_mapping->a_ops = &gfs2_file_aops;
} else if (S_ISDIR(mode)) {
inode->i_op = &gfs2_dir_iops;
inode->i_fop = &gfs2_dir_fops;
} else if (S_ISLNK(mode)) {
inode->i_op = &gfs2_symlink_iops;
} else {
inode->i_op = &gfs2_dev_iops;
}
error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
if (unlikely(error))
goto fail;
ip->i_gl->gl_object = ip;
error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
if (unlikely(error))
goto fail_put;
set_bit(GIF_INVALID, &ip->i_flags);
error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
if (unlikely(error))
goto fail_iopen;
gfs2_glock_put(io_gl);
unlock_new_inode(inode);
}
return inode;
fail_iopen:
gfs2_glock_put(io_gl);
fail_put:
ip->i_gl->gl_object = NULL;
gfs2_glock_put(ip->i_gl);
fail:
iput(inode);
return ERR_PTR(error);
}
static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
{
struct gfs2_dinode_host *di = &ip->i_di;
const struct gfs2_dinode *str = buf;
if (ip->i_num.no_addr != be64_to_cpu(str->di_num.no_addr)) {
if (gfs2_consist_inode(ip))
gfs2_dinode_print(ip);
return -EIO;
}
if (ip->i_num.no_formal_ino != be64_to_cpu(str->di_num.no_formal_ino))
return -ESTALE;
ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
ip->i_inode.i_rdev = 0;
switch (ip->i_inode.i_mode & S_IFMT) {
case S_IFBLK:
case S_IFCHR:
ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
be32_to_cpu(str->di_minor));
break;
};
ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
/*
* We will need to review setting the nlink count here in the
* light of the forthcoming ro bind mount work. This is a reminder
* to do that.
*/
ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink);
di->di_size = be64_to_cpu(str->di_size);
i_size_write(&ip->i_inode, di->di_size);
di->di_blocks = be64_to_cpu(str->di_blocks);
gfs2_set_inode_blocks(&ip->i_inode);
ip->i_inode.i_atime.tv_sec = be64_to_cpu(str->di_atime);
ip->i_inode.i_atime.tv_nsec = 0;
ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
ip->i_inode.i_mtime.tv_nsec = 0;
ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
ip->i_inode.i_ctime.tv_nsec = 0;
di->di_goal_meta = be64_to_cpu(str->di_goal_meta);
di->di_goal_data = be64_to_cpu(str->di_goal_data);
di->di_generation = be64_to_cpu(str->di_generation);
di->di_flags = be32_to_cpu(str->di_flags);
gfs2_set_inode_flags(&ip->i_inode);
di->di_height = be16_to_cpu(str->di_height);
di->di_depth = be16_to_cpu(str->di_depth);
di->di_entries = be32_to_cpu(str->di_entries);
di->di_eattr = be64_to_cpu(str->di_eattr);
return 0;
}
/**
* 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(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
brelse(dibh);
return -EIO;
}
error = gfs2_dinode_in(ip, dibh->b_data);
brelse(dibh);
clear_bit(GIF_INVALID, &ip->i_flags);
return error;
}
int gfs2_dinode_dealloc(struct gfs2_inode *ip)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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);
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_STATFS + RES_QUOTA, 1);
if (error)
goto out_rg_gunlock;
gfs2_trans_add_gl(ip->i_gl);
gfs2_free_di(rgd, ip);
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;
}
/**
* 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;
u32 nlink;
int error;
BUG_ON(diff != 1 && diff != -1);
nlink = ip->i_inode.i_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_inode.i_nlink) {
if (gfs2_consist_inode(ip))
gfs2_dinode_print(ip);
return -EIO;
}
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
return error;
if (diff > 0)
inc_nlink(&ip->i_inode);
else
drop_nlink(&ip->i_inode);
ip->i_inode.i_ctime = CURRENT_TIME_SEC;
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
gfs2_dinode_out(ip, dibh->b_data);
brelse(dibh);
mark_inode_dirty(&ip->i_inode);
if (ip->i_inode.i_nlink == 0)
gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
return error;
}
struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
{
struct qstr qstr;
struct inode *inode;
gfs2_str2qstr(&qstr, name);
inode = gfs2_lookupi(dip, &qstr, 1, NULL);
/* gfs2_lookupi has inconsistent callers: vfs
* related routines expect NULL for no entry found,
* gfs2_lookup_simple callers expect ENOENT
* and do not check for NULL.
*/
if (inode == NULL)
return ERR_PTR(-ENOENT);
else
return inode;
}
/**
* 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
*
* This can be called via the VFS filldir function when NFS is doing
* a readdirplus and the inode which its intending to stat isn't
* already in cache. In this case we must not take the directory glock
* again, since the readdir call will have already taken that lock.
*
* Returns: errno
*/
struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
int is_root, struct nameidata *nd)
{
struct super_block *sb = dir->i_sb;
struct gfs2_inode *dip = GFS2_I(dir);
struct gfs2_holder d_gh;
struct gfs2_inum_host inum;
unsigned int type;
int error;
struct inode *inode = NULL;
int unlock = 0;
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)) {
igrab(dir);
return dir;
}
if (gfs2_glock_is_locked_by_me(dip->i_gl) == 0) {
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
if (error)
return ERR_PTR(error);
unlock = 1;
}
if (!is_root) {
error = permission(dir, MAY_EXEC, NULL);
if (error)
goto out;
}
error = gfs2_dir_search(dir, name, &inum, &type);
if (error)
goto out;
inode = gfs2_inode_lookup(sb, &inum, type);
out:
if (unlock)
gfs2_glock_dq_uninit(&d_gh);
if (error == -ENOENT)
return NULL;
return inode ? inode : ERR_PTR(error);
}
static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
{
struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
struct buffer_head *bh;
struct gfs2_inum_range_host 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, u64 *formal_ino)
{
struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
struct gfs2_holder gh;
struct buffer_head *bh;
struct gfs2_inum_range_host 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;
u64 x, y;
__be64 z;
error = gfs2_meta_inode_buffer(m_ip, &m_bh);
if (error)
goto out_brelse;
z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
x = y = be64_to_cpu(z);
ir.ir_start = x;
ir.ir_length = GFS2_INUM_QUANTUM;
x += GFS2_INUM_QUANTUM;
if (x < y)
gfs2_consist_inode(m_ip);
z = cpu_to_be64(x);
gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
*(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z;
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, u64 *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, const struct qstr *name,
unsigned int mode)
{
int error;
error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
if (error)
return error;
/* Don't create entries in an unlinked directory */
if (!dip->i_inode.i_nlink)
return -EPERM;
error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
switch (error) {
case -ENOENT:
error = 0;
break;
case 0:
return -EEXIST;
default:
return error;
}
if (dip->i_di.di_entries == (u32)-1)
return -EFBIG;
if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-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 (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
(dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
if (S_ISDIR(*mode))
*mode |= S_ISUID;
else if (dip->i_inode.i_uid != current->fsuid)
*mode &= ~07111;
*uid = dip->i_inode.i_uid;
} else
*uid = current->fsuid;
if (dip->i_inode.i_mode & S_ISGID) {
if (S_ISDIR(*mode))
*mode |= S_ISGID;
*gid = dip->i_inode.i_gid;
} else
*gid = current->fsgid;
}
static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum,
u64 *generation)
{
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
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_STATFS, 0);
if (error)
goto out_ipreserv;
inum->no_addr = gfs2_alloc_di(dip, generation);
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,
const struct gfs2_inum_host *inum, unsigned int mode,
unsigned int uid, unsigned int gid,
const u64 *generation, dev_t dev)
{
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
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 = 0;
di->di_size = 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 = cpu_to_be32(MAJOR(dev));
di->di_minor = cpu_to_be32(MINOR(dev));
di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
di->di_generation = cpu_to_be64(*generation);
di->di_flags = 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_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
di->di_height = 0;
di->__pad2 = 0;
di->__pad3 = 0;
di->di_depth = 0;
di->di_entries = 0;
memset(&di->__pad4, 0, sizeof(di->__pad4));
di->di_eattr = 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, const struct gfs2_inum_host *inum,
const u64 *generation, dev_t dev)
{
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
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_QUOTA, 0);
if (error)
goto out_quota;
init_dinode(dip, gl, inum, mode, uid, gid, generation, dev);
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, const struct qstr *name,
struct gfs2_inode *ip)
{
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
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_inode, name);
if (alloc_required < 0)
goto fail;
if (alloc_required) {
error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_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_STATFS + RES_QUOTA, 0);
if (error)
goto fail_ipreserv;
} else {
error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
if (error)
goto fail_quota_locks;
}
error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_inode.i_mode));
if (error)
goto fail_end_trans;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
goto fail_end_trans;
ip->i_inode.i_nlink = 1;
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
gfs2_dinode_out(ip, dibh->b_data);
brelse(dibh);
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;
}
static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip)
{
int err;
size_t len;
void *value;
char *name;
struct gfs2_ea_request er;
err = security_inode_init_security(&ip->i_inode, &dip->i_inode,
&name, &value, &len);
if (err) {
if (err == -EOPNOTSUPP)
return 0;
return err;
}
memset(&er, 0, sizeof(struct gfs2_ea_request));
er.er_type = GFS2_EATYPE_SECURITY;
er.er_name = name;
er.er_data = value;
er.er_name_len = strlen(name);
er.er_data_len = len;
err = gfs2_ea_set_i(ip, &er);
kfree(value);
kfree(name);
return err;
}
/**
* 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, const struct qstr *name,
unsigned int mode, dev_t dev)
{
struct inode *inode;
struct gfs2_inode *dip = ghs->gh_gl->gl_object;
struct inode *dir = &dip->i_inode;
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
struct gfs2_inum_host inum;
int error;
u64 generation;
if (!name->len || name->len > GFS2_FNAMESIZE)
return ERR_PTR(-ENAMETOOLONG);
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, &inum.no_formal_ino);
if (error)
goto fail_gunlock;
error = alloc_dinode(dip, &inum, &generation);
if (error)
goto fail_gunlock;
error = gfs2_glock_nq_num(sdp, 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, &inum, &generation, dev);
if (error)
goto fail_gunlock2;
inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
if (IS_ERR(inode))
goto fail_gunlock2;
error = gfs2_inode_refresh(GFS2_I(inode));
if (error)
goto fail_iput;
error = gfs2_acl_create(dip, GFS2_I(inode));
if (error)
goto fail_iput;
error = gfs2_security_init(dip, GFS2_I(inode));
if (error)
goto fail_iput;
error = link_dinode(dip, name, GFS2_I(inode));
if (error)
goto fail_iput;
if (!inode)
return ERR_PTR(-ENOMEM);
return inode;
fail_iput:
iput(inode);
fail_gunlock2:
gfs2_glock_dq_uninit(ghs + 1);
fail_gunlock:
gfs2_glock_dq(ghs);
fail:
return ERR_PTR(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, const struct qstr *name,
struct gfs2_inode *ip)
{
struct qstr dotname;
int error;
if (ip->i_di.di_entries != 2) {
if (gfs2_consist_inode(ip))
gfs2_dinode_print(ip);
return -EIO;
}
error = gfs2_dir_del(dip, name);
if (error)
return error;
error = gfs2_change_nlink(dip, -1);
if (error)
return error;
gfs2_str2qstr(&dotname, ".");
error = gfs2_dir_del(ip, &dotname);
if (error)
return error;
gfs2_str2qstr(&dotname, "..");
error = gfs2_dir_del(ip, &dotname);
if (error)
return error;
/* It looks odd, but it really should be done twice */
error = gfs2_change_nlink(ip, -1);
if (error)
return error;
error = gfs2_change_nlink(ip, -1);
if (error)
return error;
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, const struct qstr *name,
struct gfs2_inode *ip)
{
struct gfs2_inum_host inum;
unsigned int type;
int error;
if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
return -EPERM;
if ((dip->i_inode.i_mode & S_ISVTX) &&
dip->i_inode.i_uid != current->fsuid &&
ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER))
return -EPERM;
if (IS_APPEND(&dip->i_inode))
return -EPERM;
error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
if (error)
return error;
error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
if (error)
return error;
if (!gfs2_inum_equal(&inum, &ip->i_num))
return -ENOENT;
if (IF2DT(ip->i_inode.i_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_inode;
struct super_block *sb = dir->i_sb;
struct inode *tmp;
struct qstr dotdot;
int error = 0;
gfs2_str2qstr(&dotdot, "..");
igrab(dir);
for (;;) {
if (dir == &this->i_inode) {
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;
s64 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_inode.i_atime.tv_sec >= 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_inode.i_atime.tv_sec >= quantum) {
struct buffer_head *dibh;
struct gfs2_dinode *di;
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_inode.i_atime.tv_sec = curtime;
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
di = (struct gfs2_dinode *)dibh->b_data;
di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
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;
}
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_inode, attr);
gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
gfs2_dinode_out(ip, 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(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
if (error)
return error;
error = __gfs2_setattr_simple(ip, attr);
gfs2_trans_end(GFS2_SB(&ip->i_inode));
return error;
}
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