mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 16:38:12 +00:00
913e99287b
Now that all of the update_time operations are prepared for it, we can drop the timespec64 argument from the update_time operation. Do that and remove it from some associated functions like inode_update_time and inode_needs_update_time. Signed-off-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: Jan Kara <jack@suse.cz> Message-Id: <20230807-mgctime-v7-8-d1dec143a704@kernel.org> Signed-off-by: Christian Brauner <brauner@kernel.org>
2205 lines
52 KiB
C
2205 lines
52 KiB
C
// 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;
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* 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_holder i_gh;
|
|
int error;
|
|
|
|
gfs2_holder_mark_uninitialized(&i_gh);
|
|
inode = iget5_locked(sb, no_addr, iget_test, iget_set, &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);
|
|
struct gfs2_glock *io_gl;
|
|
int extra_flags = 0;
|
|
|
|
error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE,
|
|
&ip->i_gl);
|
|
if (unlikely(error))
|
|
goto fail;
|
|
|
|
error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE,
|
|
&io_gl);
|
|
if (unlikely(error))
|
|
goto fail;
|
|
|
|
/*
|
|
* The only caller that sets @blktype to GFS2_BLKST_UNLINKED is
|
|
* delete_work_func(). Make sure not to cancel the delete work
|
|
* from within itself here.
|
|
*/
|
|
if (blktype == GFS2_BLKST_UNLINKED)
|
|
extra_flags |= LM_FLAG_TRY;
|
|
else
|
|
gfs2_cancel_delete_work(io_gl);
|
|
error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED,
|
|
GL_EXACT | GL_NOPID | extra_flags,
|
|
&ip->i_iopen_gh);
|
|
gfs2_glock_put(io_gl);
|
|
if (unlikely(error))
|
|
goto fail;
|
|
|
|
if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
|
|
/*
|
|
* The GL_SKIP flag indicates to skip reading the inode
|
|
* block. We read the inode when instantiating it
|
|
* 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;
|
|
}
|
|
}
|
|
|
|
set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags);
|
|
|
|
/* 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;
|
|
|
|
glock_set_object(ip->i_gl, ip);
|
|
|
|
if (type == DT_UNKNOWN) {
|
|
/* Inode glock must be locked already */
|
|
error = gfs2_instantiate(&i_gh);
|
|
if (error) {
|
|
glock_clear_object(ip->i_gl, ip);
|
|
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);
|
|
glock_set_object(ip->i_iopen_gh.gh_gl, ip);
|
|
|
|
gfs2_set_iop(inode);
|
|
unlock_new_inode(inode);
|
|
}
|
|
|
|
if (no_formal_ino && ip->i_no_formal_ino &&
|
|
no_formal_ino != ip->i_no_formal_ino) {
|
|
iput(inode);
|
|
return ERR_PTR(-ESTALE);
|
|
}
|
|
|
|
return inode;
|
|
|
|
fail:
|
|
if (error == GLR_TRYFAILED)
|
|
error = -EAGAIN;
|
|
if (gfs2_holder_initialized(&ip->i_iopen_gh))
|
|
gfs2_glock_dq_uninit(&ip->i_iopen_gh);
|
|
if (gfs2_holder_initialized(&i_gh))
|
|
gfs2_glock_dq_uninit(&i_gh);
|
|
if (ip->i_gl) {
|
|
gfs2_glock_put(ip->i_gl);
|
|
ip->i_gl = NULL;
|
|
}
|
|
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(&nop_mnt_idmap, 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(&nop_mnt_idmap, &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);
|
|
if (error)
|
|
goto out_trans_end;
|
|
|
|
ip->i_no_formal_ino = ip->i_generation;
|
|
ip->i_inode.i_ino = ip->i_no_addr;
|
|
ip->i_goal = ip->i_no_addr;
|
|
if (*dblocks > 1)
|
|
ip->i_eattr = ip->i_no_addr + 1;
|
|
|
|
out_trans_end:
|
|
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
|
|
*
|
|
* FIXME: Change to allocate the disk blocks and write them out in the same
|
|
* transaction. That way, we can no longer end up in a situation in which an
|
|
* inode is allocated, the node crashes, and the block looks like a valid
|
|
* inode. (With atomic creates in place, we will also no longer need to zero
|
|
* the link count and dirty the inode here on failure.)
|
|
*
|
|
* 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 d_gh, gh;
|
|
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;
|
|
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, &d_gh);
|
|
if (error)
|
|
goto fail;
|
|
gfs2_holder_mark_uninitialized(&gh);
|
|
|
|
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(&d_gh);
|
|
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;
|
|
ip = GFS2_I(inode);
|
|
|
|
error = posix_acl_create(dir, &mode, &default_acl, &acl);
|
|
if (error)
|
|
goto fail_gunlock;
|
|
|
|
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_set_ctime_current(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;
|
|
|
|
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);
|
|
|
|
retry:
|
|
error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr);
|
|
if (error == -EBUSY)
|
|
goto retry;
|
|
if (error)
|
|
goto fail_gunlock2;
|
|
|
|
error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID,
|
|
&ip->i_iopen_gh);
|
|
if (error)
|
|
goto fail_gunlock2;
|
|
|
|
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
|
|
if (error)
|
|
goto fail_gunlock3;
|
|
|
|
error = gfs2_trans_begin(sdp, blocks, 0);
|
|
if (error)
|
|
goto fail_gunlock3;
|
|
|
|
if (blocks > 1)
|
|
gfs2_init_xattr(ip);
|
|
init_dinode(dip, ip, symname);
|
|
gfs2_trans_end(sdp);
|
|
|
|
glock_set_object(ip->i_gl, ip);
|
|
glock_set_object(io_gl, ip);
|
|
gfs2_set_iop(inode);
|
|
|
|
if (default_acl) {
|
|
error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
|
|
if (error)
|
|
goto fail_gunlock4;
|
|
posix_acl_release(default_acl);
|
|
default_acl = NULL;
|
|
}
|
|
if (acl) {
|
|
error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
|
|
if (error)
|
|
goto fail_gunlock4;
|
|
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_gunlock4;
|
|
|
|
error = link_dinode(dip, name, ip, &da);
|
|
if (error)
|
|
goto fail_gunlock4;
|
|
|
|
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(&d_gh);
|
|
gfs2_qa_put(ip);
|
|
gfs2_glock_dq_uninit(&gh);
|
|
gfs2_glock_put(io_gl);
|
|
gfs2_qa_put(dip);
|
|
unlock_new_inode(inode);
|
|
return error;
|
|
|
|
fail_gunlock4:
|
|
glock_clear_object(ip->i_gl, ip);
|
|
glock_clear_object(io_gl, ip);
|
|
fail_gunlock3:
|
|
gfs2_glock_dq_uninit(&ip->i_iopen_gh);
|
|
fail_gunlock2:
|
|
gfs2_glock_put(io_gl);
|
|
fail_free_inode:
|
|
if (ip->i_gl) {
|
|
gfs2_glock_put(ip->i_gl);
|
|
ip->i_gl = NULL;
|
|
}
|
|
gfs2_rs_deltree(&ip->i_res);
|
|
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(&d_gh);
|
|
if (!IS_ERR_OR_NULL(inode)) {
|
|
set_bit(GIF_ALLOC_FAILED, &ip->i_flags);
|
|
clear_nlink(inode);
|
|
if (ip->i_no_addr)
|
|
mark_inode_dirty(inode);
|
|
if (inode->i_state & I_NEW)
|
|
iget_failed(inode);
|
|
else
|
|
iput(inode);
|
|
}
|
|
if (gfs2_holder_initialized(&gh))
|
|
gfs2_glock_dq_uninit(&gh);
|
|
fail:
|
|
gfs2_qa_put(dip);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_create - Create a file
|
|
* @idmap: idmap 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 mnt_idmap *idmap, 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 d_gh, gh;
|
|
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, &d_gh);
|
|
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
|
|
|
|
error = gfs2_glock_nq(&d_gh);
|
|
if (error)
|
|
goto out_parent;
|
|
|
|
error = gfs2_glock_nq(&gh);
|
|
if (error)
|
|
goto out_child;
|
|
|
|
error = -ENOENT;
|
|
if (inode->i_nlink == 0)
|
|
goto out_gunlock;
|
|
|
|
error = gfs2_permission(&nop_mnt_idmap, 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 = -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);
|
|
inode_set_ctime_current(&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(&gh);
|
|
out_child:
|
|
gfs2_glock_dq(&d_gh);
|
|
out_parent:
|
|
gfs2_qa_put(dip);
|
|
gfs2_holder_uninit(&d_gh);
|
|
gfs2_holder_uninit(&gh);
|
|
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(&nop_mnt_idmap, &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_set_ctime_current(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 d_gh, r_gh, gh;
|
|
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, &d_gh);
|
|
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
|
|
|
|
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, &r_gh);
|
|
|
|
|
|
error = gfs2_glock_nq(&d_gh);
|
|
if (error)
|
|
goto out_parent;
|
|
|
|
error = gfs2_glock_nq(&gh);
|
|
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(&r_gh); /* 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(&r_gh);
|
|
out_rgrp:
|
|
gfs2_glock_dq(&gh);
|
|
out_child:
|
|
gfs2_glock_dq(&d_gh);
|
|
out_parent:
|
|
gfs2_holder_uninit(&r_gh);
|
|
out_inodes:
|
|
gfs2_holder_uninit(&gh);
|
|
gfs2_holder_uninit(&d_gh);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* gfs2_symlink - Create a symlink
|
|
* @idmap: idmap 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 mnt_idmap *idmap, 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
|
|
* @idmap: idmap 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 mnt_idmap *idmap, 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
|
|
* @idmap: idmap 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 mnt_idmap *idmap, 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);
|
|
|
|
inode_set_ctime_current(&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(&nop_mnt_idmap, 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(&nop_mnt_idmap, 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(&nop_mnt_idmap, odentry->d_inode,
|
|
MAY_WRITE);
|
|
if (error)
|
|
goto out_gunlock;
|
|
}
|
|
if (S_ISDIR(new_mode)) {
|
|
error = gfs2_permission(&nop_mnt_idmap, 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 mnt_idmap *idmap, 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
|
|
* @idmap: idmap 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 mnt_idmap *idmap, 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(&nop_mnt_idmap, 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(&nop_mnt_idmap, 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
|
|
* @idmap: idmap 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 mnt_idmap *idmap,
|
|
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(&nop_mnt_idmap, inode, attr->ia_valid);
|
|
if (error)
|
|
goto error;
|
|
|
|
error = setattr_prepare(&nop_mnt_idmap, 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(&nop_mnt_idmap, dentry,
|
|
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
|
|
* @idmap: idmap 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 mnt_idmap *idmap,
|
|
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(&nop_mnt_idmap, request_mask, 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, 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;
|
|
}
|
|
generic_update_time(inode, flags);
|
|
return 0;
|
|
}
|
|
|
|
static const struct inode_operations gfs2_file_iops = {
|
|
.permission = gfs2_permission,
|
|
.setattr = gfs2_setattr,
|
|
.getattr = gfs2_getattr,
|
|
.listxattr = gfs2_listxattr,
|
|
.fiemap = gfs2_fiemap,
|
|
.get_inode_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_inode_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,
|
|
};
|
|
|