mirrors/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2025-11-04 02:30:34 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions
linux/fs/gfs2/inode.c
Andreas Gruenbacher d75b9fa053 gfs2: Switch to may_setattr in gfs2_setattr 
The permission check in gfs2_setattr is an old and outdated version of
may_setattr().  Switch to the updated version.

Fixes fstest generic/079.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2021-08-13 00:41:05 -04:00

2193 lines
52 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
*/
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/namei.h>
#include <linux/mm.h>
#include <linux/cred.h>
#include <linux/xattr.h>
#include <linux/posix_acl.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
#include <linux/iomap.h>
#include <linux/security.h>
#include <linux/fiemap.h>
#include <linux/uaccess.h>
#include "gfs2.h"
#include "incore.h"
#include "acl.h"
#include "bmap.h"
#include "dir.h"
#include "xattr.h"
#include "glock.h"
#include "inode.h"
#include "meta_io.h"
#include "quota.h"
#include "rgrp.h"
#include "trans.h"
#include "util.h"
#include "super.h"
#include "glops.h"
static const struct inode_operations gfs2_file_iops;
static const struct inode_operations gfs2_dir_iops;
static const struct inode_operations gfs2_symlink_iops;
static int iget_test(struct inode *inode, void *opaque)
{
u64 no_addr = *(u64 *)opaque;
return GFS2_I(inode)->i_no_addr == no_addr;
}
static int iget_set(struct inode *inode, void *opaque)
{
u64 no_addr = *(u64 *)opaque;
GFS2_I(inode)->i_no_addr = no_addr;
inode->i_ino = no_addr;
return 0;
}
static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
{
struct inode *inode;
repeat:
inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
if (!inode)
return inode;
if (is_bad_inode(inode)) {
iput(inode);
goto repeat;
}
return inode;
}
/**
* gfs2_set_iop - Sets inode operations
* @inode: The inode with correct i_mode filled in
*
* GFS2 lookup code fills in vfs inode contents based on info obtained
* from directory entry inside gfs2_inode_lookup().
*/
static void gfs2_set_iop(struct inode *inode)
{
struct gfs2_sbd *sdp = GFS2_SB(inode);
umode_t mode = inode->i_mode;
if (S_ISREG(mode)) {
inode->i_op = &gfs2_file_iops;
if (gfs2_localflocks(sdp))
inode->i_fop = &gfs2_file_fops_nolock;
else
inode->i_fop = &gfs2_file_fops;
} else if (S_ISDIR(mode)) {
inode->i_op = &gfs2_dir_iops;
if (gfs2_localflocks(sdp))
inode->i_fop = &gfs2_dir_fops_nolock;
else
inode->i_fop = &gfs2_dir_fops;
} else if (S_ISLNK(mode)) {
inode->i_op = &gfs2_symlink_iops;
} else {
inode->i_op = &gfs2_file_iops;
init_special_inode(inode, inode->i_mode, inode->i_rdev);
}
}
/**
* gfs2_inode_lookup - Lookup an inode
* @sb: The super block
* @type: The type of the inode
* @no_addr: The inode number
* @no_formal_ino: The inode generation number
* @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
* GFS2_BLKST_FREE to indicate not to verify)
*
* If @type is DT_UNKNOWN, the inode type is fetched from disk.
*
* If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
* placeholder because it doesn't otherwise make sense), the on-disk block type
* is verified to be @blktype.
*
* When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE)
* if it detects that @no_formal_ino doesn't match the actual inode generation
* number. However, it doesn't always know unless @type is DT_UNKNOWN.
*
* Returns: A VFS inode, or an error
*/
struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
u64 no_addr, u64 no_formal_ino,
unsigned int blktype)
{
struct inode *inode;
struct gfs2_inode *ip;
struct gfs2_glock *io_gl = NULL;
struct gfs2_holder i_gh;
int error;
gfs2_holder_mark_uninitialized(&i_gh);
inode = gfs2_iget(sb, no_addr);
if (!inode)
return ERR_PTR(-ENOMEM);
ip = GFS2_I(inode);
if (inode->i_state & I_NEW) {
struct gfs2_sbd *sdp = GFS2_SB(inode);
error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
if (unlikely(error))
goto fail;
flush_delayed_work(&ip->i_gl->gl_work);
error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
if (unlikely(error))
goto fail;
if (blktype != GFS2_BLKST_UNLINKED)
gfs2_cancel_delete_work(io_gl);
if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
/*
* The GL_SKIP flag indicates to skip reading the inode
* block. We read the inode with gfs2_inode_refresh
* after possibly checking the block type.
*/
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
GL_SKIP, &i_gh);
if (error)
goto fail;
error = -ESTALE;
if (no_formal_ino &&
gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
goto fail;
if (blktype != GFS2_BLKST_FREE) {
error = gfs2_check_blk_type(sdp, no_addr,
blktype);
if (error)
goto fail;
}
}
glock_set_object(ip->i_gl, ip);
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;
glock_set_object(ip->i_iopen_gh.gh_gl, ip);
gfs2_glock_put(io_gl);
io_gl = NULL;
/* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
inode->i_atime.tv_nsec = 0;
if (type == DT_UNKNOWN) {
/* Inode glock must be locked already */
error = gfs2_inode_refresh(GFS2_I(inode));
if (error)
goto fail;
} else {
ip->i_no_formal_ino = no_formal_ino;
inode->i_mode = DT2IF(type);
}
if (gfs2_holder_initialized(&i_gh))
gfs2_glock_dq_uninit(&i_gh);
gfs2_set_iop(inode);
}
if (no_formal_ino && ip->i_no_formal_ino &&
no_formal_ino != ip->i_no_formal_ino) {
error = -ESTALE;
if (inode->i_state & I_NEW)
goto fail;
iput(inode);
return ERR_PTR(error);
}
if (inode->i_state & I_NEW)
unlock_new_inode(inode);
return inode;
fail:
if (io_gl)
gfs2_glock_put(io_gl);
if (gfs2_holder_initialized(&i_gh))
gfs2_glock_dq_uninit(&i_gh);
iget_failed(inode);
return ERR_PTR(error);
}
/**
* gfs2_lookup_by_inum - look up an inode by inode number
* @sdp: The super block
* @no_addr: The inode number
* @no_formal_ino: The inode generation number (0 for any)
* @blktype: Requested block type (see gfs2_inode_lookup)
*/
struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
u64 no_formal_ino, unsigned int blktype)
{
struct super_block *sb = sdp->sd_vfs;
struct inode *inode;
int error;
inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
blktype);
if (IS_ERR(inode))
return inode;
if (no_formal_ino) {
error = -EIO;
if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
goto fail_iput;
}
return inode;
fail_iput:
iput(inode);
return ERR_PTR(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);
/* 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
* @dir: The inode of the directory containing the inode to look-up
* @name: The name of the inode to look for
* @is_root: If 1, ignore the caller's permissions
*
* 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 super_block *sb = dir->i_sb;
struct gfs2_inode *dip = GFS2_I(dir);
struct gfs2_holder d_gh;
int error = 0;
struct inode *inode = NULL;
gfs2_holder_mark_uninitialized(&d_gh);
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 == d_inode(sb->s_root))) {
igrab(dir);
return dir;
}
if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
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_permission(&init_user_ns, dir, MAY_EXEC);
if (error)
goto out;
}
inode = gfs2_dir_search(dir, name, false);
if (IS_ERR(inode))
error = PTR_ERR(inode);
out:
if (gfs2_holder_initialized(&d_gh))
gfs2_glock_dq_uninit(&d_gh);
if (error == -ENOENT)
return NULL;
return inode ? inode : ERR_PTR(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,
umode_t mode)
{
int error;
error = gfs2_permission(&init_user_ns, &dip->i_inode,
MAY_WRITE | MAY_EXEC);
if (error)
return error;
/* Don't create entries in an unlinked directory */
if (!dip->i_inode.i_nlink)
return -ENOENT;
if (dip->i_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(const struct gfs2_inode *dip,
struct inode *inode)
{
if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
(dip->i_inode.i_mode & S_ISUID) &&
!uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
if (S_ISDIR(inode->i_mode))
inode->i_mode |= S_ISUID;
else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
inode->i_mode &= ~07111;
inode->i_uid = dip->i_inode.i_uid;
} else
inode->i_uid = current_fsuid();
if (dip->i_inode.i_mode & S_ISGID) {
if (S_ISDIR(inode->i_mode))
inode->i_mode |= S_ISGID;
inode->i_gid = dip->i_inode.i_gid;
} else
inode->i_gid = current_fsgid();
}
static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
int error;
error = gfs2_quota_lock_check(ip, &ap);
if (error)
goto out;
error = gfs2_inplace_reserve(ip, &ap);
if (error)
goto out_quota;
error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
if (error)
goto out_ipreserv;
error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
ip->i_no_formal_ino = ip->i_generation;
ip->i_inode.i_ino = ip->i_no_addr;
ip->i_goal = ip->i_no_addr;
gfs2_trans_end(sdp);
out_ipreserv:
gfs2_inplace_release(ip);
out_quota:
gfs2_quota_unlock(ip);
out:
return error;
}
static void gfs2_init_dir(struct buffer_head *dibh,
const struct gfs2_inode *parent)
{
struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
dent->de_inum = di->di_num; /* already GFS2 endian */
dent->de_type = cpu_to_be16(DT_DIR);
dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
gfs2_inum_out(parent, dent);
dent->de_type = cpu_to_be16(DT_DIR);
}
/**
* gfs2_init_xattr - Initialise an xattr block for a new inode
* @ip: The inode in question
*
* This sets up an empty xattr block for a new inode, ready to
* take any ACLs, LSM xattrs, etc.
*/
static void gfs2_init_xattr(struct gfs2_inode *ip)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct buffer_head *bh;
struct gfs2_ea_header *ea;
bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
gfs2_trans_add_meta(ip->i_gl, bh);
gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
ea = GFS2_EA_BH2FIRST(bh);
ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
ea->ea_type = GFS2_EATYPE_UNUSED;
ea->ea_flags = GFS2_EAFLAG_LAST;
brelse(bh);
}
/**
* init_dinode - Fill in a new dinode structure
* @dip: The directory this inode is being created in
* @ip: The inode
* @symname: The symlink destination (if a symlink)
*
*/
static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
const char *symname)
{
struct gfs2_dinode *di;
struct buffer_head *dibh;
dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
gfs2_trans_add_meta(ip->i_gl, dibh);
di = (struct gfs2_dinode *)dibh->b_data;
gfs2_dinode_out(ip, di);
di->di_major = cpu_to_be32(imajor(&ip->i_inode));
di->di_minor = cpu_to_be32(iminor(&ip->i_inode));
di->__pad1 = 0;
di->__pad2 = 0;
di->__pad3 = 0;
memset(&di->__pad4, 0, sizeof(di->__pad4));
memset(&di->di_reserved, 0, sizeof(di->di_reserved));
gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
switch(ip->i_inode.i_mode & S_IFMT) {
case S_IFDIR:
gfs2_init_dir(dibh, dip);
break;
case S_IFLNK:
memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
break;
}
set_buffer_uptodate(dibh);
brelse(dibh);
}
/**
* gfs2_trans_da_blks - Calculate number of blocks to link inode
* @dip: The directory we are linking into
* @da: The dir add information
* @nr_inodes: The number of inodes involved
*
* This calculate the number of blocks we need to reserve in a
* transaction to link @nr_inodes into a directory. In most cases
* @nr_inodes will be 2 (the directory plus the inode being linked in)
* but in case of rename, 4 may be required.
*
* Returns: Number of blocks
*/
static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
const struct gfs2_diradd *da,
unsigned nr_inodes)
{
return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
(nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
}
static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
struct gfs2_inode *ip, struct gfs2_diradd *da)
{
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
int error;
if (da->nr_blocks) {
error = gfs2_quota_lock_check(dip, &ap);
if (error)
goto fail_quota_locks;
error = gfs2_inplace_reserve(dip, &ap);
if (error)
goto fail_quota_locks;
error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 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, da);
gfs2_trans_end(sdp);
fail_ipreserv:
gfs2_inplace_release(dip);
fail_quota_locks:
gfs2_quota_unlock(dip);
return error;
}
static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
void *fs_info)
{
const struct xattr *xattr;
int err = 0;
for (xattr = xattr_array; xattr->name != NULL; xattr++) {
err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
xattr->value_len, 0,
GFS2_EATYPE_SECURITY);
if (err < 0)
break;
}
return err;
}
/**
* gfs2_create_inode - Create a new inode
* @dir: The parent directory
* @dentry: The new dentry
* @file: If non-NULL, the file which is being opened
* @mode: The permissions on the new inode
* @dev: For device nodes, this is the device number
* @symname: For symlinks, this is the link destination
* @size: The initial size of the inode (ignored for directories)
* @excl: Force fail if inode exists
*
* Returns: 0 on success, or error code
*/
static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
struct file *file,
umode_t mode, dev_t dev, const char *symname,
unsigned int size, int excl)
{
const struct qstr *name = &dentry->d_name;
struct posix_acl *default_acl, *acl;
struct gfs2_holder ghs[2];
struct inode *inode = NULL;
struct gfs2_inode *dip = GFS2_I(dir), *ip;
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
struct gfs2_glock *io_gl;
int error, free_vfs_inode = 1;
u32 aflags = 0;
unsigned blocks = 1;
struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
if (!name->len || name->len > GFS2_FNAMESIZE)
return -ENAMETOOLONG;
error = gfs2_qa_get(dip);
if (error)
return error;
error = gfs2_rindex_update(sdp);
if (error)
goto fail;
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
if (error)
goto fail;
gfs2_holder_mark_uninitialized(ghs + 1);
error = create_ok(dip, name, mode);
if (error)
goto fail_gunlock;
inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
error = PTR_ERR(inode);
if (!IS_ERR(inode)) {
if (S_ISDIR(inode->i_mode)) {
iput(inode);
inode = ERR_PTR(-EISDIR);
goto fail_gunlock;
}
d_instantiate(dentry, inode);
error = 0;
if (file) {
if (S_ISREG(inode->i_mode))
error = finish_open(file, dentry, gfs2_open_common);
else
error = finish_no_open(file, NULL);
}
gfs2_glock_dq_uninit(ghs);
goto fail;
} else if (error != -ENOENT) {
goto fail_gunlock;
}
error = gfs2_diradd_alloc_required(dir, name, &da);
if (error < 0)
goto fail_gunlock;
inode = new_inode(sdp->sd_vfs);
error = -ENOMEM;
if (!inode)
goto fail_gunlock;
error = posix_acl_create(dir, &mode, &default_acl, &acl);
if (error)
goto fail_gunlock;
ip = GFS2_I(inode);
error = gfs2_qa_get(ip);
if (error)
goto fail_free_acls;
inode->i_mode = mode;
set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
inode->i_rdev = dev;
inode->i_size = size;
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
munge_mode_uid_gid(dip, inode);
check_and_update_goal(dip);
ip->i_goal = dip->i_goal;
ip->i_diskflags = 0;
ip->i_eattr = 0;
ip->i_height = 0;
ip->i_depth = 0;
ip->i_entries = 0;
ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
switch(mode & S_IFMT) {
case S_IFREG:
if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
gfs2_tune_get(sdp, gt_new_files_jdata))
ip->i_diskflags |= GFS2_DIF_JDATA;
gfs2_set_aops(inode);
break;
case S_IFDIR:
ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
ip->i_diskflags |= GFS2_DIF_JDATA;
ip->i_entries = 2;
break;
}
/* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
if (dip->i_diskflags & GFS2_DIF_SYSTEM)
ip->i_diskflags |= GFS2_DIF_SYSTEM;
gfs2_set_inode_flags(inode);
if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
(dip->i_diskflags & GFS2_DIF_TOPDIR))
aflags |= GFS2_AF_ORLOV;
if (default_acl || acl)
blocks++;
error = alloc_dinode(ip, aflags, &blocks);
if (error)
goto fail_free_inode;
gfs2_set_inode_blocks(inode, blocks);
error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
if (error)
goto fail_free_inode;
flush_delayed_work(&ip->i_gl->gl_work);
glock_set_object(ip->i_gl, ip);
error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
if (error)
goto fail_free_inode;
gfs2_cancel_delete_work(io_gl);
glock_set_object(io_gl, ip);
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
if (error)
goto fail_gunlock2;
error = gfs2_trans_begin(sdp, blocks, 0);
if (error)
goto fail_gunlock2;
if (blocks > 1) {
ip->i_eattr = ip->i_no_addr + 1;
gfs2_init_xattr(ip);
}
init_dinode(dip, ip, symname);
gfs2_trans_end(sdp);
error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
if (error)
goto fail_gunlock2;
gfs2_set_iop(inode);
insert_inode_hash(inode);
free_vfs_inode = 0; /* After this point, the inode is no longer
considered free. Any failures need to undo
the gfs2 structures. */
if (default_acl) {
error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
if (error)
goto fail_gunlock3;
posix_acl_release(default_acl);
default_acl = NULL;
}
if (acl) {
error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
if (error)
goto fail_gunlock3;
posix_acl_release(acl);
acl = NULL;
}
error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
&gfs2_initxattrs, NULL);
if (error)
goto fail_gunlock3;
error = link_dinode(dip, name, ip, &da);
if (error)
goto fail_gunlock3;
mark_inode_dirty(inode);
d_instantiate(dentry, inode);
/* After instantiate, errors should result in evict which will destroy
* both inode and iopen glocks properly. */
if (file) {
file->f_mode |= FMODE_CREATED;
error = finish_open(file, dentry, gfs2_open_common);
}
gfs2_glock_dq_uninit(ghs);
gfs2_qa_put(ip);
gfs2_glock_dq_uninit(ghs + 1);
gfs2_glock_put(io_gl);
gfs2_qa_put(dip);
return error;
fail_gunlock3:
glock_clear_object(io_gl, ip);
gfs2_glock_dq_uninit(&ip->i_iopen_gh);
fail_gunlock2:
glock_clear_object(io_gl, ip);
gfs2_glock_put(io_gl);
fail_free_inode:
if (ip->i_gl) {
glock_clear_object(ip->i_gl, ip);
if (free_vfs_inode) /* else evict will do the put for us */
gfs2_glock_put(ip->i_gl);
}
gfs2_rs_delete(ip, NULL);
gfs2_qa_put(ip);
fail_free_acls:
posix_acl_release(default_acl);
posix_acl_release(acl);
fail_gunlock:
gfs2_dir_no_add(&da);
gfs2_glock_dq_uninit(ghs);
if (!IS_ERR_OR_NULL(inode)) {
clear_nlink(inode);
if (!free_vfs_inode)
mark_inode_dirty(inode);
set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
&GFS2_I(inode)->i_flags);
iput(inode);
}
if (gfs2_holder_initialized(ghs + 1))
gfs2_glock_dq_uninit(ghs + 1);
fail:
gfs2_qa_put(dip);
return error;
}
/**
* gfs2_create - Create a file
* @mnt_userns: User namespace of the mount the inode was found from
* @dir: The directory in which to create the file
* @dentry: The dentry of the new file
* @mode: The mode of the new file
* @excl: Force fail if inode exists
*
* Returns: errno
*/
static int gfs2_create(struct user_namespace *mnt_userns, struct inode *dir,
struct dentry *dentry, umode_t mode, bool excl)
{
return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
}
/**
* __gfs2_lookup - Look up a filename in a directory and return its inode
* @dir: The directory inode
* @dentry: The dentry of the new inode
* @file: File to be opened
*
*
* Returns: errno
*/
static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
struct file *file)
{
struct inode *inode;
struct dentry *d;
struct gfs2_holder gh;
struct gfs2_glock *gl;
int error;
inode = gfs2_lookupi(dir, &dentry->d_name, 0);
if (inode == NULL) {
d_add(dentry, NULL);
return NULL;
}
if (IS_ERR(inode))
return ERR_CAST(inode);
gl = GFS2_I(inode)->i_gl;
error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
if (error) {
iput(inode);
return ERR_PTR(error);
}
d = d_splice_alias(inode, dentry);
if (IS_ERR(d)) {
gfs2_glock_dq_uninit(&gh);
return d;
}
if (file && S_ISREG(inode->i_mode))
error = finish_open(file, dentry, gfs2_open_common);
gfs2_glock_dq_uninit(&gh);
if (error) {
dput(d);
return ERR_PTR(error);
}
return d;
}
static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
unsigned flags)
{
return __gfs2_lookup(dir, dentry, 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 = GFS2_I(dir);
struct gfs2_sbd *sdp = GFS2_SB(dir);
struct inode *inode = d_inode(old_dentry);
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder ghs[2];
struct buffer_head *dibh;
struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
int error;
if (S_ISDIR(inode->i_mode))
return -EPERM;
error = gfs2_qa_get(dip);
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(ghs); /* parent */
if (error)
goto out_parent;
error = gfs2_glock_nq(ghs + 1); /* child */
if (error)
goto out_child;
error = -ENOENT;
if (inode->i_nlink == 0)
goto out_gunlock;
error = gfs2_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
if (error)
goto out_gunlock;
error = gfs2_dir_check(dir, &dentry->d_name, NULL);
switch (error) {
case -ENOENT:
break;
case 0:
error = -EEXIST;
goto out_gunlock;
default:
goto out_gunlock;
}
error = -EINVAL;
if (!dip->i_inode.i_nlink)
goto out_gunlock;
error = -EFBIG;
if (dip->i_entries == (u32)-1)
goto out_gunlock;
error = -EPERM;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
goto out_gunlock;
error = -EINVAL;
if (!ip->i_inode.i_nlink)
goto out_gunlock;
error = -EMLINK;
if (ip->i_inode.i_nlink == (u32)-1)
goto out_gunlock;
error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
if (error < 0)
goto out_gunlock;
if (da.nr_blocks) {
struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
error = gfs2_quota_lock_check(dip, &ap);
if (error)
goto out_gunlock;
error = gfs2_inplace_reserve(dip, &ap);
if (error)
goto out_gunlock_q;
error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 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_meta_inode_buffer(ip, &dibh);
if (error)
goto out_end_trans;
error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
if (error)
goto out_brelse;
gfs2_trans_add_meta(ip->i_gl, dibh);
inc_nlink(&ip->i_inode);
ip->i_inode.i_ctime = current_time(&ip->i_inode);
ihold(inode);
d_instantiate(dentry, inode);
mark_inode_dirty(inode);
out_brelse:
brelse(dibh);
out_end_trans:
gfs2_trans_end(sdp);
out_ipres:
if (da.nr_blocks)
gfs2_inplace_release(dip);
out_gunlock_q:
if (da.nr_blocks)
gfs2_quota_unlock(dip);
out_gunlock:
gfs2_dir_no_add(&da);
gfs2_glock_dq(ghs + 1);
out_child:
gfs2_glock_dq(ghs);
out_parent:
gfs2_qa_put(dip);
gfs2_holder_uninit(ghs);
gfs2_holder_uninit(ghs + 1);
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
*/
static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
const struct gfs2_inode *ip)
{
int error;
if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
return -EPERM;
if ((dip->i_inode.i_mode & S_ISVTX) &&
!uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
!uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
return -EPERM;
if (IS_APPEND(&dip->i_inode))
return -EPERM;
error = gfs2_permission(&init_user_ns, &dip->i_inode,
MAY_WRITE | MAY_EXEC);
if (error)
return error;
return gfs2_dir_check(&dip->i_inode, name, ip);
}
/**
* gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
* @dip: The parent directory
* @dentry: The dentry to unlink
*
* Called with all the locks and in a transaction. This will only be
* called for a directory after it has been checked to ensure it is empty.
*
* Returns: 0 on success, or an error
*/
static int gfs2_unlink_inode(struct gfs2_inode *dip,
const struct dentry *dentry)
{
struct inode *inode = d_inode(dentry);
struct gfs2_inode *ip = GFS2_I(inode);
int error;
error = gfs2_dir_del(dip, dentry);
if (error)
return error;
ip->i_entries = 0;
inode->i_ctime = current_time(inode);
if (S_ISDIR(inode->i_mode))
clear_nlink(inode);
else
drop_nlink(inode);
mark_inode_dirty(inode);
if (inode->i_nlink == 0)
gfs2_unlink_di(inode);
return 0;
}
/**
* gfs2_unlink - Unlink an inode (this does rmdir as well)
* @dir: The inode of the directory containing the inode to unlink
* @dentry: The file itself
*
* This routine uses the type of the inode as a flag to figure out
* whether this is an unlink or an rmdir.
*
* Returns: errno
*/
static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
{
struct gfs2_inode *dip = GFS2_I(dir);
struct gfs2_sbd *sdp = GFS2_SB(dir);
struct inode *inode = d_inode(dentry);
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder ghs[3];
struct gfs2_rgrpd *rgd;
int error;
error = gfs2_rindex_update(sdp);
if (error)
return error;
error = -EROFS;
gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
if (!rgd)
goto out_inodes;
gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, ghs + 2);
error = gfs2_glock_nq(ghs); /* parent */
if (error)
goto out_parent;
error = gfs2_glock_nq(ghs + 1); /* child */
if (error)
goto out_child;
error = -ENOENT;
if (inode->i_nlink == 0)
goto out_rgrp;
if (S_ISDIR(inode->i_mode)) {
error = -ENOTEMPTY;
if (ip->i_entries > 2 || inode->i_nlink > 2)
goto out_rgrp;
}
error = gfs2_glock_nq(ghs + 2); /* rgrp */
if (error)
goto out_rgrp;
error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
if (error)
goto out_gunlock;
error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
if (error)
goto out_gunlock;
error = gfs2_unlink_inode(dip, dentry);
gfs2_trans_end(sdp);
out_gunlock:
gfs2_glock_dq(ghs + 2);
out_rgrp:
gfs2_glock_dq(ghs + 1);
out_child:
gfs2_glock_dq(ghs);
out_parent:
gfs2_holder_uninit(ghs + 2);
out_inodes:
gfs2_holder_uninit(ghs + 1);
gfs2_holder_uninit(ghs);
return error;
}
/**
* gfs2_symlink - Create a symlink
* @mnt_userns: User namespace of the mount the inode was found from
* @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 user_namespace *mnt_userns, struct inode *dir,
struct dentry *dentry, const char *symname)
{
unsigned int size;
size = strlen(symname);
if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
return -ENAMETOOLONG;
return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
}
/**
* gfs2_mkdir - Make a directory
* @mnt_userns: User namespace of the mount the inode was found from
* @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 user_namespace *mnt_userns, struct inode *dir,
struct dentry *dentry, umode_t mode)
{
unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
}
/**
* gfs2_mknod - Make a special file
* @mnt_userns: User namespace of the mount the inode was found from
* @dir: The directory in which the special file will reside
* @dentry: The dentry of the special file
* @mode: The mode of the special file
* @dev: The device specification of the special file
*
*/
static int gfs2_mknod(struct user_namespace *mnt_userns, struct inode *dir,
struct dentry *dentry, umode_t mode, dev_t dev)
{
return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
}
/**
* gfs2_atomic_open - Atomically open a file
* @dir: The directory
* @dentry: The proposed new entry
* @file: The proposed new struct file
* @flags: open flags
* @mode: File mode
*
* Returns: error code or 0 for success
*/
static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
struct file *file, unsigned flags,
umode_t mode)
{
struct dentry *d;
bool excl = !!(flags & O_EXCL);
if (!d_in_lookup(dentry))
goto skip_lookup;
d = __gfs2_lookup(dir, dentry, file);
if (IS_ERR(d))
return PTR_ERR(d);
if (d != NULL)
dentry = d;
if (d_really_is_positive(dentry)) {
if (!(file->f_mode & FMODE_OPENED))
return finish_no_open(file, d);
dput(d);
return excl && (flags & O_CREAT) ? -EEXIST : 0;
}
BUG_ON(d != NULL);
skip_lookup:
if (!(flags & O_CREAT))
return -ENOENT;
return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
}
/*
* 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
*/
static 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;
int error = 0;
igrab(dir);
for (;;) {
if (dir == &this->i_inode) {
error = -EINVAL;
break;
}
if (dir == d_inode(sb->s_root)) {
error = 0;
break;
}
tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
if (!tmp) {
error = -ENOENT;
break;
}
if (IS_ERR(tmp)) {
error = PTR_ERR(tmp);
break;
}
iput(dir);
dir = tmp;
}
iput(dir);
return error;
}
/**
* update_moved_ino - Update an inode that's being moved
* @ip: The inode being moved
* @ndip: The parent directory of the new filename
* @dir_rename: True of ip is a directory
*
* Returns: errno
*/
static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
int dir_rename)
{
if (dir_rename)
return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
ip->i_inode.i_ctime = current_time(&ip->i_inode);
mark_inode_dirty_sync(&ip->i_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 = GFS2_I(odir);
struct gfs2_inode *ndip = GFS2_I(ndir);
struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
struct gfs2_inode *nip = NULL;
struct gfs2_sbd *sdp = GFS2_SB(odir);
struct gfs2_holder ghs[4], r_gh, rd_gh;
struct gfs2_rgrpd *nrgd;
unsigned int num_gh;
int dir_rename = 0;
struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
unsigned int x;
int error;
gfs2_holder_mark_uninitialized(&r_gh);
gfs2_holder_mark_uninitialized(&rd_gh);
if (d_really_is_positive(ndentry)) {
nip = GFS2_I(d_inode(ndentry));
if (ip == nip)
return 0;
}
error = gfs2_rindex_update(sdp);
if (error)
return error;
error = gfs2_qa_get(ndip);
if (error)
return error;
if (odip != ndip) {
error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
0, &r_gh);
if (error)
goto out;
if (S_ISDIR(ip->i_inode.i_mode)) {
dir_rename = 1;
/* don't move a directory into its subdir */
error = gfs2_ok_to_move(ip, ndip);
if (error)
goto out_gunlock_r;
}
}
num_gh = 1;
gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
if (odip != ndip) {
gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
ghs + num_gh);
num_gh++;
}
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
num_gh++;
if (nip) {
gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
ghs + num_gh);
num_gh++;
}
for (x = 0; x < num_gh; x++) {
error = gfs2_glock_nq(ghs + x);
if (error)
goto out_gunlock;
}
error = gfs2_glock_async_wait(num_gh, ghs);
if (error)
goto out_gunlock;
if (nip) {
/* Grab the resource group glock for unlink flag twiddling.
* This is the case where the target dinode already exists
* so we unlink before doing the rename.
*/
nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
if (!nrgd) {
error = -ENOENT;
goto out_gunlock;
}
error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE,
LM_FLAG_NODE_SCOPE, &rd_gh);
if (error)
goto out_gunlock;
}
error = -ENOENT;
if (ip->i_inode.i_nlink == 0)
goto out_gunlock;
/* 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 (nip->i_inode.i_nlink == 0) {
error = -EAGAIN;
goto out_gunlock;
}
if (S_ISDIR(nip->i_inode.i_mode)) {
if (nip->i_entries < 2) {
gfs2_consist_inode(nip);
error = -EIO;
goto out_gunlock;
}
if (nip->i_entries > 2) {
error = -ENOTEMPTY;
goto out_gunlock;
}
}
} else {
error = gfs2_permission(&init_user_ns, ndir,
MAY_WRITE | MAY_EXEC);
if (error)
goto out_gunlock;
error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
switch (error) {
case -ENOENT:
error = 0;
break;
case 0:
error = -EEXIST;
goto out_gunlock;
default:
goto out_gunlock;
}
if (odip != ndip) {
if (!ndip->i_inode.i_nlink) {
error = -ENOENT;
goto out_gunlock;
}
if (ndip->i_entries == (u32)-1) {
error = -EFBIG;
goto out_gunlock;
}
if (S_ISDIR(ip->i_inode.i_mode) &&
ndip->i_inode.i_nlink == (u32)-1) {
error = -EMLINK;
goto out_gunlock;
}
}
}
/* Check out the dir to be renamed */
if (dir_rename) {
error = gfs2_permission(&init_user_ns, d_inode(odentry),
MAY_WRITE);
if (error)
goto out_gunlock;
}
if (nip == NULL) {
error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
if (error)
goto out_gunlock;
}
if (da.nr_blocks) {
struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
error = gfs2_quota_lock_check(ndip, &ap);
if (error)
goto out_gunlock;
error = gfs2_inplace_reserve(ndip, &ap);
if (error)
goto out_gunlock_q;
error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
4 * RES_LEAF + 4, 0);
if (error)
goto out_ipreserv;
} else {
error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
5 * RES_LEAF + 4, 0);
if (error)
goto out_gunlock;
}
/* Remove the target file, if it exists */
if (nip)
error = gfs2_unlink_inode(ndip, ndentry);
error = update_moved_ino(ip, ndip, dir_rename);
if (error)
goto out_end_trans;
error = gfs2_dir_del(odip, odentry);
if (error)
goto out_end_trans;
error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
if (error)
goto out_end_trans;
out_end_trans:
gfs2_trans_end(sdp);
out_ipreserv:
if (da.nr_blocks)
gfs2_inplace_release(ndip);
out_gunlock_q:
if (da.nr_blocks)
gfs2_quota_unlock(ndip);
out_gunlock:
gfs2_dir_no_add(&da);
if (gfs2_holder_initialized(&rd_gh))
gfs2_glock_dq_uninit(&rd_gh);
while (x--) {
if (gfs2_holder_queued(ghs + x))
gfs2_glock_dq(ghs + x);
gfs2_holder_uninit(ghs + x);
}
out_gunlock_r:
if (gfs2_holder_initialized(&r_gh))
gfs2_glock_dq_uninit(&r_gh);
out:
gfs2_qa_put(ndip);
return error;
}
/**
* gfs2_exchange - exchange two files
* @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
* @flags: The rename flags
*
* Returns: errno
*/
static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
struct inode *ndir, struct dentry *ndentry,
unsigned int flags)
{
struct gfs2_inode *odip = GFS2_I(odir);
struct gfs2_inode *ndip = GFS2_I(ndir);
struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
struct gfs2_sbd *sdp = GFS2_SB(odir);
struct gfs2_holder ghs[4], r_gh;
unsigned int num_gh;
unsigned int x;
umode_t old_mode = oip->i_inode.i_mode;
umode_t new_mode = nip->i_inode.i_mode;
int error;
gfs2_holder_mark_uninitialized(&r_gh);
error = gfs2_rindex_update(sdp);
if (error)
return error;
if (odip != ndip) {
error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
0, &r_gh);
if (error)
goto out;
if (S_ISDIR(old_mode)) {
/* don't move a directory into its subdir */
error = gfs2_ok_to_move(oip, ndip);
if (error)
goto out_gunlock_r;
}
if (S_ISDIR(new_mode)) {
/* don't move a directory into its subdir */
error = gfs2_ok_to_move(nip, odip);
if (error)
goto out_gunlock_r;
}
}
num_gh = 1;
gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
if (odip != ndip) {
gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
ghs + num_gh);
num_gh++;
}
gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
num_gh++;
gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
num_gh++;
for (x = 0; x < num_gh; x++) {
error = gfs2_glock_nq(ghs + x);
if (error)
goto out_gunlock;
}
error = gfs2_glock_async_wait(num_gh, ghs);
if (error)
goto out_gunlock;
error = -ENOENT;
if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
goto out_gunlock;
error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
if (error)
goto out_gunlock;
error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
if (error)
goto out_gunlock;
if (S_ISDIR(old_mode)) {
error = gfs2_permission(&init_user_ns, odentry->d_inode,
MAY_WRITE);
if (error)
goto out_gunlock;
}
if (S_ISDIR(new_mode)) {
error = gfs2_permission(&init_user_ns, ndentry->d_inode,
MAY_WRITE);
if (error)
goto out_gunlock;
}
error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
if (error)
goto out_gunlock;
error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
if (error)
goto out_end_trans;
error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
if (error)
goto out_end_trans;
error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
IF2DT(old_mode));
if (error)
goto out_end_trans;
error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
IF2DT(new_mode));
if (error)
goto out_end_trans;
if (odip != ndip) {
if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
inc_nlink(&odip->i_inode);
drop_nlink(&ndip->i_inode);
} else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
inc_nlink(&ndip->i_inode);
drop_nlink(&odip->i_inode);
}
}
mark_inode_dirty(&ndip->i_inode);
if (odip != ndip)
mark_inode_dirty(&odip->i_inode);
out_end_trans:
gfs2_trans_end(sdp);
out_gunlock:
while (x--) {
if (gfs2_holder_queued(ghs + x))
gfs2_glock_dq(ghs + x);
gfs2_holder_uninit(ghs + x);
}
out_gunlock_r:
if (gfs2_holder_initialized(&r_gh))
gfs2_glock_dq_uninit(&r_gh);
out:
return error;
}
static int gfs2_rename2(struct user_namespace *mnt_userns, struct inode *odir,
struct dentry *odentry, struct inode *ndir,
struct dentry *ndentry, unsigned int flags)
{
flags &= ~RENAME_NOREPLACE;
if (flags & ~RENAME_EXCHANGE)
return -EINVAL;
if (flags & RENAME_EXCHANGE)
return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
return gfs2_rename(odir, odentry, ndir, ndentry);
}
/**
* gfs2_get_link - Follow a symbolic link
* @dentry: The dentry of the link
* @inode: The inode of the link
* @done: destructor for return value
*
* This can handle symlinks of any size.
*
* Returns: 0 on success or error code
*/
static const char *gfs2_get_link(struct dentry *dentry,
struct inode *inode,
struct delayed_call *done)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder i_gh;
struct buffer_head *dibh;
unsigned int size;
char *buf;
int error;
if (!dentry)
return ERR_PTR(-ECHILD);
gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
error = gfs2_glock_nq(&i_gh);
if (error) {
gfs2_holder_uninit(&i_gh);
return ERR_PTR(error);
}
size = (unsigned int)i_size_read(&ip->i_inode);
if (size == 0) {
gfs2_consist_inode(ip);
buf = ERR_PTR(-EIO);
goto out;
}
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error) {
buf = ERR_PTR(error);
goto out;
}
buf = kzalloc(size + 1, GFP_NOFS);
if (!buf)
buf = ERR_PTR(-ENOMEM);
else
memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
brelse(dibh);
out:
gfs2_glock_dq_uninit(&i_gh);
if (!IS_ERR(buf))
set_delayed_call(done, kfree_link, buf);
return buf;
}
/**
* gfs2_permission
* @mnt_userns: User namespace of the mount the inode was found from
* @inode: The inode
* @mask: The mask to be tested
*
* This may be called from the VFS directly, or from within GFS2 with the
* inode locked, so we look to see if the glock is already locked and only
* lock the glock if its not already been done.
*
* Returns: errno
*/
int gfs2_permission(struct user_namespace *mnt_userns, struct inode *inode,
int mask)
{
struct gfs2_inode *ip;
struct gfs2_holder i_gh;
int error;
gfs2_holder_mark_uninitialized(&i_gh);
ip = GFS2_I(inode);
if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
if (mask & MAY_NOT_BLOCK)
return -ECHILD;
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
if (error)
return error;
}
if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
error = -EPERM;
else
error = generic_permission(&init_user_ns, inode, mask);
if (gfs2_holder_initialized(&i_gh))
gfs2_glock_dq_uninit(&i_gh);
return error;
}
static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
{
setattr_copy(&init_user_ns, inode, attr);
mark_inode_dirty(inode);
return 0;
}
static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
{
int error;
if (current->journal_info)
return __gfs2_setattr_simple(inode, attr);
error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
if (error)
return error;
error = __gfs2_setattr_simple(inode, attr);
gfs2_trans_end(GFS2_SB(inode));
return error;
}
static int setattr_chown(struct inode *inode, struct iattr *attr)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
kuid_t ouid, nuid;
kgid_t ogid, ngid;
int error;
struct gfs2_alloc_parms ap;
ouid = inode->i_uid;
ogid = inode->i_gid;
nuid = attr->ia_uid;
ngid = attr->ia_gid;
if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
ouid = nuid = NO_UID_QUOTA_CHANGE;
if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
ogid = ngid = NO_GID_QUOTA_CHANGE;
error = gfs2_qa_get(ip);
if (error)
return error;
error = gfs2_rindex_update(sdp);
if (error)
goto out;
error = gfs2_quota_lock(ip, nuid, ngid);
if (error)
goto out;
ap.target = gfs2_get_inode_blocks(&ip->i_inode);
if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
!gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
error = gfs2_quota_check(ip, nuid, ngid, &ap);
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_setattr_simple(inode, attr);
if (error)
goto out_end_trans;
if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
!gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
gfs2_quota_change(ip, ap.target, nuid, ngid);
}
out_end_trans:
gfs2_trans_end(sdp);
out_gunlock_q:
gfs2_quota_unlock(ip);
out:
gfs2_qa_put(ip);
return error;
}
/**
* gfs2_setattr - Change attributes on an inode
* @mnt_userns: User namespace of the mount the inode was found from
* @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 user_namespace *mnt_userns,
struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = d_inode(dentry);
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder i_gh;
int error;
error = gfs2_qa_get(ip);
if (error)
return error;
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
if (error)
goto out;
error = may_setattr(&init_user_ns, inode, attr->ia_valid);
if (error)
goto error;
error = setattr_prepare(&init_user_ns, dentry, attr);
if (error)
goto error;
if (attr->ia_valid & ATTR_SIZE)
error = gfs2_setattr_size(inode, attr->ia_size);
else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
error = setattr_chown(inode, attr);
else {
error = gfs2_setattr_simple(inode, attr);
if (!error && attr->ia_valid & ATTR_MODE)
error = posix_acl_chmod(&init_user_ns, inode,
inode->i_mode);
}
error:
if (!error)
mark_inode_dirty(inode);
gfs2_glock_dq_uninit(&i_gh);
out:
gfs2_qa_put(ip);
return error;
}
/**
* gfs2_getattr - Read out an inode's attributes
* @mnt_userns: user namespace of the mount the inode was found from
* @path: Object to query
* @stat: The inode's stats
* @request_mask: Mask of STATX_xxx flags indicating the caller's interests
* @flags: AT_STATX_xxx setting
*
* This may be called from the VFS directly, or from within GFS2 with the
* inode locked, so we look to see if the glock is already locked and only
* lock the glock if its not already been done. Note that its the NFS
* readdirplus operation which causes this to be called (from filldir)
* with the glock already held.
*
* Returns: errno
*/
static int gfs2_getattr(struct user_namespace *mnt_userns,
const struct path *path, struct kstat *stat,
u32 request_mask, unsigned int flags)
{
struct inode *inode = d_inode(path->dentry);
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder gh;
u32 gfsflags;
int error;
gfs2_holder_mark_uninitialized(&gh);
if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
if (error)
return error;
}
gfsflags = ip->i_diskflags;
if (gfsflags & GFS2_DIF_APPENDONLY)
stat->attributes |= STATX_ATTR_APPEND;
if (gfsflags & GFS2_DIF_IMMUTABLE)
stat->attributes |= STATX_ATTR_IMMUTABLE;
stat->attributes_mask |= (STATX_ATTR_APPEND |
STATX_ATTR_COMPRESSED |
STATX_ATTR_ENCRYPTED |
STATX_ATTR_IMMUTABLE |
STATX_ATTR_NODUMP);
generic_fillattr(&init_user_ns, inode, stat);
if (gfs2_holder_initialized(&gh))
gfs2_glock_dq_uninit(&gh);
return 0;
}
static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
u64 start, u64 len)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder gh;
int ret;
inode_lock_shared(inode);
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
if (ret)
goto out;
ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
gfs2_glock_dq_uninit(&gh);
out:
inode_unlock_shared(inode);
return ret;
}
loff_t gfs2_seek_data(struct file *file, loff_t offset)
{
struct inode *inode = file->f_mapping->host;
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder gh;
loff_t ret;
inode_lock_shared(inode);
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
if (!ret)
ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
gfs2_glock_dq_uninit(&gh);
inode_unlock_shared(inode);
if (ret < 0)
return ret;
return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
}
loff_t gfs2_seek_hole(struct file *file, loff_t offset)
{
struct inode *inode = file->f_mapping->host;
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder gh;
loff_t ret;
inode_lock_shared(inode);
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
if (!ret)
ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
gfs2_glock_dq_uninit(&gh);
inode_unlock_shared(inode);
if (ret < 0)
return ret;
return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
}
static int gfs2_update_time(struct inode *inode, struct timespec64 *time,
int flags)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_glock *gl = ip->i_gl;
struct gfs2_holder *gh;
int error;
gh = gfs2_glock_is_locked_by_me(gl);
if (gh && !gfs2_glock_is_held_excl(gl)) {
gfs2_glock_dq(gh);
gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh);
error = gfs2_glock_nq(gh);
if (error)
return error;
}
return generic_update_time(inode, time, flags);
}
static const struct inode_operations gfs2_file_iops = {
.permission = gfs2_permission,
.setattr = gfs2_setattr,
.getattr = gfs2_getattr,
.listxattr = gfs2_listxattr,
.fiemap = gfs2_fiemap,
.get_acl = gfs2_get_acl,
.set_acl = gfs2_set_acl,
.update_time = gfs2_update_time,
.fileattr_get = gfs2_fileattr_get,
.fileattr_set = gfs2_fileattr_set,
};
static const 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_unlink,
.mknod = gfs2_mknod,
.rename = gfs2_rename2,
.permission = gfs2_permission,
.setattr = gfs2_setattr,
.getattr = gfs2_getattr,
.listxattr = gfs2_listxattr,
.fiemap = gfs2_fiemap,
.get_acl = gfs2_get_acl,
.set_acl = gfs2_set_acl,
.update_time = gfs2_update_time,
.atomic_open = gfs2_atomic_open,
.fileattr_get = gfs2_fileattr_get,
.fileattr_set = gfs2_fileattr_set,
};
static const struct inode_operations gfs2_symlink_iops = {
.get_link = gfs2_get_link,
.permission = gfs2_permission,
.setattr = gfs2_setattr,
.getattr = gfs2_getattr,
.listxattr = gfs2_listxattr,
.fiemap = gfs2_fiemap,
};
Reference in a new issue View git blame Copy permalink