/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
- * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License version 2.
*/
-#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
+#include <linux/namei.h>
+#include <linux/mm.h>
+#include <linux/xattr.h>
#include <linux/posix_acl.h>
-#include <linux/sort.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
+#include <linux/fiemap.h>
#include <linux/security.h>
-#include <linux/time.h>
+#include <asm/uaccess.h>
#include "gfs2.h"
#include "incore.h"
#include "dir.h"
#include "xattr.h"
#include "glock.h"
-#include "glops.h"
#include "inode.h"
-#include "log.h"
#include "meta_io.h"
#include "quota.h"
#include "rgrp.h"
#include "trans.h"
#include "util.h"
-
-struct gfs2_inum_range_host {
- u64 ir_start;
- u64 ir_length;
-};
+#include "super.h"
+#include "glops.h"
struct gfs2_skip_data {
u64 no_addr;
return 0;
}
-struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr)
+struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
{
unsigned long hash = (unsigned long)no_addr;
struct gfs2_skip_data data;
data.no_addr = no_addr;
data.skipped = 0;
- data.non_block = 0;
+ data.non_block = non_block;
return ilookup5(sb, hash, iget_test, &data);
}
goto fail;
}
-static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
-{
- const struct gfs2_dinode *str = buf;
- struct timespec atime;
- u16 height, depth;
-
- if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
- goto corrupt;
- ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
- ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
- ip->i_inode.i_rdev = 0;
- switch (ip->i_inode.i_mode & S_IFMT) {
- case S_IFBLK:
- case S_IFCHR:
- ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
- be32_to_cpu(str->di_minor));
- break;
- };
-
- ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
- ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
- /*
- * We will need to review setting the nlink count here in the
- * light of the forthcoming ro bind mount work. This is a reminder
- * to do that.
- */
- ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink);
- i_size_write(&ip->i_inode, be64_to_cpu(str->di_size));
- gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
- atime.tv_sec = be64_to_cpu(str->di_atime);
- atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
- if (timespec_compare(&ip->i_inode.i_atime, &atime) < 0)
- ip->i_inode.i_atime = atime;
- ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
- ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
- ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
- ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
-
- ip->i_goal = be64_to_cpu(str->di_goal_meta);
- ip->i_generation = be64_to_cpu(str->di_generation);
-
- ip->i_diskflags = be32_to_cpu(str->di_flags);
- gfs2_set_inode_flags(&ip->i_inode);
- height = be16_to_cpu(str->di_height);
- if (unlikely(height > GFS2_MAX_META_HEIGHT))
- goto corrupt;
- ip->i_height = (u8)height;
-
- depth = be16_to_cpu(str->di_depth);
- if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
- goto corrupt;
- ip->i_depth = (u8)depth;
- ip->i_entries = be32_to_cpu(str->di_entries);
-
- ip->i_eattr = be64_to_cpu(str->di_eattr);
- if (S_ISREG(ip->i_inode.i_mode))
- gfs2_set_aops(&ip->i_inode);
-
- return 0;
-corrupt:
- if (gfs2_consist_inode(ip))
- gfs2_dinode_print(ip);
- return -EIO;
-}
-
-/**
- * gfs2_inode_refresh - Refresh the incore copy of the dinode
- * @ip: The GFS2 inode
- *
- * Returns: errno
- */
-
-int gfs2_inode_refresh(struct gfs2_inode *ip)
-{
- struct buffer_head *dibh;
- int error;
-
- error = gfs2_meta_inode_buffer(ip, &dibh);
- if (error)
- return error;
-
- if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
- brelse(dibh);
- return -EIO;
- }
-
- error = gfs2_dinode_in(ip, dibh->b_data);
- brelse(dibh);
- clear_bit(GIF_INVALID, &ip->i_flags);
-
- return error;
-}
-
-int gfs2_dinode_dealloc(struct gfs2_inode *ip)
-{
- struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
- struct gfs2_alloc *al;
- struct gfs2_rgrpd *rgd;
- int error;
-
- if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
- if (gfs2_consist_inode(ip))
- gfs2_dinode_print(ip);
- return -EIO;
- }
-
- al = gfs2_alloc_get(ip);
- if (!al)
- return -ENOMEM;
-
- error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
- if (error)
- goto out;
-
- error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
- if (error)
- goto out_qs;
-
- rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
- if (!rgd) {
- gfs2_consist_inode(ip);
- error = -EIO;
- goto out_rindex_relse;
- }
-
- error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
- &al->al_rgd_gh);
- if (error)
- goto out_rindex_relse;
-
- error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
- if (error)
- goto out_rg_gunlock;
-
- set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
- set_bit(GLF_LFLUSH, &ip->i_gl->gl_flags);
-
- gfs2_free_di(rgd, ip);
-
- gfs2_trans_end(sdp);
-
-out_rg_gunlock:
- gfs2_glock_dq_uninit(&al->al_rgd_gh);
-out_rindex_relse:
- gfs2_glock_dq_uninit(&al->al_ri_gh);
-out_qs:
- gfs2_quota_unhold(ip);
-out:
- gfs2_alloc_put(ip);
- return error;
-}
-
-/**
- * gfs2_change_nlink - Change nlink count on inode
- * @ip: The GFS2 inode
- * @diff: The change in the nlink count required
- *
- * Returns: errno
- */
-int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
-{
- struct buffer_head *dibh;
- u32 nlink;
- int error;
-
- BUG_ON(diff != 1 && diff != -1);
- nlink = ip->i_inode.i_nlink + diff;
-
- /* If we are reducing the nlink count, but the new value ends up being
- bigger than the old one, we must have underflowed. */
- if (diff < 0 && nlink > ip->i_inode.i_nlink) {
- if (gfs2_consist_inode(ip))
- gfs2_dinode_print(ip);
- return -EIO;
- }
-
- error = gfs2_meta_inode_buffer(ip, &dibh);
- if (error)
- return error;
-
- if (diff > 0)
- inc_nlink(&ip->i_inode);
- else
- drop_nlink(&ip->i_inode);
-
- ip->i_inode.i_ctime = CURRENT_TIME;
-
- gfs2_trans_add_bh(ip->i_gl, dibh, 1);
- gfs2_dinode_out(ip, dibh->b_data);
- brelse(dibh);
- mark_inode_dirty(&ip->i_inode);
-
- if (ip->i_inode.i_nlink == 0)
- gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
-
- return error;
-}
struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
{
/* Don't create entries in an unlinked directory */
if (!dip->i_inode.i_nlink)
- return -EPERM;
+ return -ENOENT;
error = gfs2_dir_check(&dip->i_inode, name, NULL);
switch (error) {
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);
+
+}
+
/**
* init_dinode - Fill in a new dinode structure
- * @dip: the directory this inode is being created in
+ * @dip: The directory this inode is being created in
* @gl: The glock covering the new inode
- * @inum: the inode number
- * @mode: the file permissions
- * @uid:
- * @gid:
+ * @inum: The inode number
+ * @mode: The file permissions
+ * @uid: The uid of the new inode
+ * @gid: The gid of the new inode
+ * @generation: The generation number of the new inode
+ * @dev: The device number (if a device node)
+ * @symname: The symlink destination (if a symlink)
+ * @size: The inode size (ignored for directories)
+ * @bhp: The buffer head (returned to caller)
*
*/
static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
const struct gfs2_inum_host *inum, unsigned int mode,
unsigned int uid, unsigned int gid,
- const u64 *generation, dev_t dev, struct buffer_head **bhp)
+ const u64 *generation, dev_t dev, const char *symname,
+ unsigned size, struct buffer_head **bhp)
{
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
struct gfs2_dinode *di;
di->di_uid = cpu_to_be32(uid);
di->di_gid = cpu_to_be32(gid);
di->di_nlink = 0;
- di->di_size = 0;
+ di->di_size = cpu_to_be64(size);
di->di_blocks = cpu_to_be64(1);
di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec);
di->di_major = cpu_to_be32(MAJOR(dev));
di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
di->di_generation = cpu_to_be64(*generation);
di->di_flags = 0;
-
- if (S_ISREG(mode)) {
- if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
- gfs2_tune_get(sdp, gt_new_files_jdata))
- di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
- } else if (S_ISDIR(mode)) {
- di->di_flags |= cpu_to_be32(dip->i_diskflags &
- GFS2_DIF_INHERIT_JDATA);
- }
-
di->__pad1 = 0;
di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
di->di_height = 0;
di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
memset(&di->di_reserved, 0, sizeof(di->di_reserved));
-
+
+ switch(mode & S_IFMT) {
+ case S_IFREG:
+ if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
+ gfs2_tune_get(sdp, gt_new_files_jdata))
+ di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
+ break;
+ case S_IFDIR:
+ di->di_flags |= cpu_to_be32(dip->i_diskflags &
+ GFS2_DIF_INHERIT_JDATA);
+ di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
+ di->di_size = cpu_to_be64(sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
+ di->di_entries = cpu_to_be32(2);
+ gfs2_init_dir(dibh, dip);
+ break;
+ case S_IFLNK:
+ memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, size);
+ break;
+ }
+
set_buffer_uptodate(dibh);
*bhp = dibh;
static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
unsigned int mode, const struct gfs2_inum_host *inum,
- const u64 *generation, dev_t dev, struct buffer_head **bhp)
+ const u64 *generation, dev_t dev, const char *symname,
+ unsigned int size, struct buffer_head **bhp)
{
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
unsigned int uid, gid;
if (error)
goto out_quota;
- init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, bhp);
+ init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, symname, size, bhp);
gfs2_quota_change(dip, +1, uid, gid);
gfs2_trans_end(sdp);
goto fail_quota_locks;
}
- error = gfs2_dir_add(&dip->i_inode, name, ip, IF2DT(ip->i_inode.i_mode));
+ error = gfs2_dir_add(&dip->i_inode, name, ip);
if (error)
goto fail_end_trans;
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
goto fail_end_trans;
- ip->i_inode.i_nlink = 1;
+ inc_nlink(&ip->i_inode);
+ if (S_ISDIR(ip->i_inode.i_mode))
+ inc_nlink(&ip->i_inode);
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
gfs2_dinode_out(ip, dibh->b_data);
brelse(dibh);
}
/**
- * gfs2_createi - Create a new inode
- * @ghs: An array of two holders
- * @name: The name of the new file
- * @mode: the permissions on the new inode
- *
- * @ghs[0] is an initialized holder for the directory
- * @ghs[1] is the holder for the inode lock
+ * gfs2_create_inode - Create a new inode
+ * @dir: The parent directory
+ * @dentry: The new dentry
+ * @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)
*
- * If the return value is not NULL, the glocks on both the directory and the new
- * file are held. A transaction has been started and an inplace reservation
- * is held, as well.
- *
- * Returns: An inode
+ * Returns: 0 on success, or error code
*/
-struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
- unsigned int mode, dev_t dev)
+static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
+ unsigned int mode, dev_t dev, const char *symname,
+ unsigned int size)
{
+ const struct qstr *name = &dentry->d_name;
+ struct gfs2_holder ghs[2];
struct inode *inode = NULL;
- struct gfs2_inode *dip = ghs->gh_gl->gl_object;
- struct inode *dir = &dip->i_inode;
+ struct gfs2_inode *dip = GFS2_I(dir);
struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
int error;
struct buffer_head *bh = NULL;
if (!name->len || name->len > GFS2_FNAMESIZE)
- return ERR_PTR(-ENAMETOOLONG);
+ return -ENAMETOOLONG;
- gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
- error = gfs2_glock_nq(ghs);
+ error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
if (error)
goto fail;
if (error)
goto fail_gunlock;
- error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, &bh);
+ error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh);
if (error)
goto fail_gunlock2;
if (bh)
brelse(bh);
- return inode;
+
+ gfs2_trans_end(sdp);
+ if (dip->i_alloc->al_rgd)
+ gfs2_inplace_release(dip);
+ gfs2_quota_unlock(dip);
+ gfs2_alloc_put(dip);
+ gfs2_glock_dq_uninit_m(2, ghs);
+ mark_inode_dirty(inode);
+ d_instantiate(dentry, inode);
+ return 0;
fail_gunlock2:
gfs2_glock_dq_uninit(ghs + 1);
if (inode && !IS_ERR(inode))
iput(inode);
fail_gunlock:
- gfs2_glock_dq(ghs);
+ gfs2_glock_dq_uninit(ghs);
fail:
if (bh)
brelse(bh);
- return ERR_PTR(error);
+ return error;
}
-static int __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
+/**
+ * gfs2_create - Create a file
+ * @dir: The directory in which to create the file
+ * @dentry: The dentry of the new file
+ * @mode: The mode of the new file
+ *
+ * Returns: errno
+ */
+
+static int gfs2_create(struct inode *dir, struct dentry *dentry,
+ int mode, struct nameidata *nd)
{
- struct inode *inode = &ip->i_inode;
+ struct inode *inode;
+ int ret;
+
+ for (;;) {
+ ret = gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0);
+ if (ret != -EEXIST || (nd && (nd->flags & LOOKUP_EXCL)))
+ return ret;
+
+ inode = gfs2_lookupi(dir, &dentry->d_name, 0);
+ if (inode) {
+ if (!IS_ERR(inode))
+ break;
+ return PTR_ERR(inode);
+ }
+ }
+
+ d_instantiate(dentry, inode);
+ return 0;
+}
+
+/**
+ * gfs2_lookup - Look up a filename in a directory and return its inode
+ * @dir: The directory inode
+ * @dentry: The dentry of the new inode
+ * @nd: passed from Linux VFS, ignored by us
+ *
+ * Called by the VFS layer. Lock dir and call gfs2_lookupi()
+ *
+ * Returns: errno
+ */
+
+static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
+ struct nameidata *nd)
+{
+ struct inode *inode = NULL;
+
+ inode = gfs2_lookupi(dir, &dentry->d_name, 0);
+ if (inode && IS_ERR(inode))
+ return ERR_CAST(inode);
+
+ if (inode) {
+ struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
+ struct gfs2_holder gh;
+ int error;
+ error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
+ if (error) {
+ iput(inode);
+ return ERR_PTR(error);
+ }
+ gfs2_glock_dq_uninit(&gh);
+ return d_splice_alias(inode, dentry);
+ }
+ d_add(dentry, inode);
+
+ return NULL;
+}
+
+/**
+ * gfs2_link - Link to a file
+ * @old_dentry: The inode to link
+ * @dir: Add link to this directory
+ * @dentry: The name of the link
+ *
+ * Link the inode in "old_dentry" into the directory "dir" with the
+ * name in "dentry".
+ *
+ * Returns: errno
+ */
+
+static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
+ struct dentry *dentry)
+{
+ struct gfs2_inode *dip = GFS2_I(dir);
+ struct gfs2_sbd *sdp = GFS2_SB(dir);
+ struct inode *inode = old_dentry->d_inode;
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder ghs[2];
struct buffer_head *dibh;
+ int alloc_required;
int error;
+ if (S_ISDIR(inode->i_mode))
+ return -EPERM;
+
+ gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
+ gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
+
+ error = gfs2_glock_nq(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(dir, MAY_WRITE | MAY_EXEC, 0);
+ if (error)
+ goto out_gunlock;
+
+ error = gfs2_dir_check(dir, &dentry->d_name, NULL);
+ switch (error) {
+ case -ENOENT:
+ break;
+ case 0:
+ error = -EEXIST;
+ 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;
+
+ alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
+ if (error < 0)
+ goto out_gunlock;
+ error = 0;
+
+ if (alloc_required) {
+ struct gfs2_alloc *al = gfs2_alloc_get(dip);
+ if (!al) {
+ error = -ENOMEM;
+ goto out_gunlock;
+ }
+
+ error = gfs2_quota_lock_check(dip);
+ if (error)
+ goto out_alloc;
+
+ al->al_requested = sdp->sd_max_dirres;
+
+ error = gfs2_inplace_reserve(dip);
+ if (error)
+ goto out_gunlock_q;
+
+ error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
+ gfs2_rg_blocks(al) +
+ 2 * RES_DINODE + RES_STATFS +
+ RES_QUOTA, 0);
+ if (error)
+ goto out_ipres;
+ } else {
+ error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
+ if (error)
+ goto out_ipres;
+ }
+
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
- return error;
+ goto out_end_trans;
+
+ error = gfs2_dir_add(dir, &dentry->d_name, ip);
+ if (error)
+ goto out_brelse;
- setattr_copy(inode, attr);
- mark_inode_dirty(inode);
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ inc_nlink(&ip->i_inode);
+ ip->i_inode.i_ctime = CURRENT_TIME;
gfs2_dinode_out(ip, dibh->b_data);
+ mark_inode_dirty(&ip->i_inode);
+
+out_brelse:
brelse(dibh);
- return 0;
+out_end_trans:
+ gfs2_trans_end(sdp);
+out_ipres:
+ if (alloc_required)
+ gfs2_inplace_release(dip);
+out_gunlock_q:
+ if (alloc_required)
+ gfs2_quota_unlock(dip);
+out_alloc:
+ if (alloc_required)
+ gfs2_alloc_put(dip);
+out_gunlock:
+ gfs2_glock_dq(ghs + 1);
+out_child:
+ gfs2_glock_dq(ghs);
+out_parent:
+ gfs2_holder_uninit(ghs);
+ gfs2_holder_uninit(ghs + 1);
+ if (!error) {
+ ihold(inode);
+ d_instantiate(dentry, inode);
+ mark_inode_dirty(inode);
+ }
+ return error;
}
-/**
- * gfs2_setattr_simple -
- * @ip:
- * @attr:
+/*
+ * 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
*
- * Called with a reference on the vnode.
+ * Assumes that the lock on (at least) @dip is held.
*
- * Returns: errno
+ * Returns: 0 if the parent/child relationship is correct, errno if it isn't
*/
-int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
+static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
+ const struct gfs2_inode *ip)
{
int error;
- if (current->journal_info)
- return __gfs2_setattr_simple(ip, attr);
+ if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
+ return -EPERM;
- error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
+ if ((dip->i_inode.i_mode & S_ISVTX) &&
+ dip->i_inode.i_uid != current_fsuid() &&
+ ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
+ return -EPERM;
+
+ if (IS_APPEND(&dip->i_inode))
+ return -EPERM;
+
+ error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0);
if (error)
return error;
- error = __gfs2_setattr_simple(ip, attr);
- gfs2_trans_end(GFS2_SB(&ip->i_inode));
- return error;
-}
+ error = gfs2_dir_check(&dip->i_inode, name, ip);
+ if (error)
+ return error;
-void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
-{
- struct gfs2_dinode *str = buf;
-
- str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
- str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
- str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
- str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
- str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
- str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
- str->di_uid = cpu_to_be32(ip->i_inode.i_uid);
- str->di_gid = cpu_to_be32(ip->i_inode.i_gid);
- str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
- str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
- str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
- str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
- str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
- str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
-
- str->di_goal_meta = cpu_to_be64(ip->i_goal);
- str->di_goal_data = cpu_to_be64(ip->i_goal);
- str->di_generation = cpu_to_be64(ip->i_generation);
-
- str->di_flags = cpu_to_be32(ip->i_diskflags);
- str->di_height = cpu_to_be16(ip->i_height);
- str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
- !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
- GFS2_FORMAT_DE : 0);
- str->di_depth = cpu_to_be16(ip->i_depth);
- str->di_entries = cpu_to_be32(ip->i_entries);
-
- str->di_eattr = cpu_to_be64(ip->i_eattr);
- str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
- str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
- str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
-}
-
-void gfs2_dinode_print(const struct gfs2_inode *ip)
-{
- printk(KERN_INFO " no_formal_ino = %llu\n",
- (unsigned long long)ip->i_no_formal_ino);
- printk(KERN_INFO " no_addr = %llu\n",
- (unsigned long long)ip->i_no_addr);
- printk(KERN_INFO " i_size = %llu\n",
- (unsigned long long)i_size_read(&ip->i_inode));
- printk(KERN_INFO " blocks = %llu\n",
- (unsigned long long)gfs2_get_inode_blocks(&ip->i_inode));
- printk(KERN_INFO " i_goal = %llu\n",
- (unsigned long long)ip->i_goal);
- printk(KERN_INFO " i_diskflags = 0x%.8X\n", ip->i_diskflags);
- printk(KERN_INFO " i_height = %u\n", ip->i_height);
- printk(KERN_INFO " i_depth = %u\n", ip->i_depth);
- printk(KERN_INFO " i_entries = %u\n", ip->i_entries);
- printk(KERN_INFO " i_eattr = %llu\n",
- (unsigned long long)ip->i_eattr);
+ return 0;
}
+/**
+ * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
+ * @dip: The parent directory
+ * @name: The name of the entry in the parent directory
+ * @bh: The inode buffer for the inode to be removed
+ * @inode: The inode to be removed
+ *
+ * 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 buffer_head *bh)
+{
+ struct inode *inode = dentry->d_inode;
+ 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;
+ if (S_ISDIR(inode->i_mode))
+ clear_nlink(inode);
+ else
+ drop_nlink(inode);
+ gfs2_trans_add_bh(ip->i_gl, bh, 1);
+ gfs2_dinode_out(ip, bh->b_data);
+ 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 = dentry->d_inode;
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct buffer_head *bh;
+ struct gfs2_holder ghs[3];
+ struct gfs2_rgrpd *rgd;
+ struct gfs2_holder ri_gh;
+ int error;
+
+ error = gfs2_rindex_hold(sdp, &ri_gh);
+ 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);
+
+ rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
+ gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, 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_meta_inode_buffer(ip, &bh);
+ if (error)
+ goto out_end_trans;
+
+ error = gfs2_unlink_inode(dip, dentry, bh);
+ brelse(bh);
+
+out_end_trans:
+ gfs2_trans_end(sdp);
+out_gunlock:
+ gfs2_glock_dq(ghs + 2);
+out_rgrp:
+ gfs2_holder_uninit(ghs + 2);
+ gfs2_glock_dq(ghs + 1);
+out_child:
+ gfs2_holder_uninit(ghs + 1);
+ gfs2_glock_dq(ghs);
+out_parent:
+ gfs2_holder_uninit(ghs);
+ gfs2_glock_dq_uninit(&ri_gh);
+ return error;
+}
+
+/**
+ * gfs2_symlink - Create a symlink
+ * @dir: The directory to create the symlink in
+ * @dentry: The dentry to put the symlink in
+ * @symname: The thing which the link points to
+ *
+ * Returns: errno
+ */
+
+static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
+ const char *symname)
+{
+ struct gfs2_sbd *sdp = GFS2_SB(dir);
+ unsigned int size;
+
+ size = strlen(symname);
+ if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
+ return -ENAMETOOLONG;
+
+ return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size);
+}
+
+/**
+ * gfs2_mkdir - Make a directory
+ * @dir: The parent directory of the new one
+ * @dentry: The dentry of the new directory
+ * @mode: The mode of the new directory
+ *
+ * Returns: errno
+ */
+
+static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+ return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0);
+}
+
+/**
+ * gfs2_mknod - Make a special file
+ * @dir: The directory in which the special file will reside
+ * @dentry: The dentry of the special file
+ * @mode: The mode of the special file
+ * @dev: The device specification of the special file
+ *
+ */
+
+static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
+ dev_t dev)
+{
+ return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0);
+}
+
+/*
+ * gfs2_ok_to_move - check if it's ok to move a directory to another directory
+ * @this: move this
+ * @to: to here
+ *
+ * Follow @to back to the root and make sure we don't encounter @this
+ * Assumes we already hold the rename lock.
+ *
+ * Returns: errno
+ */
+
+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 == sb->s_root->d_inode) {
+ error = 0;
+ break;
+ }
+
+ tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
+ if (IS_ERR(tmp)) {
+ error = PTR_ERR(tmp);
+ break;
+ }
+
+ iput(dir);
+ dir = tmp;
+ }
+
+ iput(dir);
+
+ return error;
+}
+
+/**
+ * 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(odentry->d_inode);
+ struct gfs2_inode *nip = NULL;
+ struct gfs2_sbd *sdp = GFS2_SB(odir);
+ struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh;
+ struct gfs2_rgrpd *nrgd;
+ unsigned int num_gh;
+ int dir_rename = 0;
+ int alloc_required = 0;
+ unsigned int x;
+ int error;
+
+ if (ndentry->d_inode) {
+ nip = GFS2_I(ndentry->d_inode);
+ if (ip == nip)
+ return 0;
+ }
+
+ error = gfs2_rindex_hold(sdp, &ri_gh);
+ 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 dirctory into it's 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, 0, ghs);
+ if (odip != ndip) {
+ gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
+ num_gh++;
+ }
+ gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
+ num_gh++;
+
+ if (nip) {
+ gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
+ num_gh++;
+ /* grab the resource lock for unlink flag twiddling
+ * this is the case of the target file already existing
+ * so we unlink before doing the rename
+ */
+ nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
+ if (nrgd)
+ gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
+ }
+
+ for (x = 0; x < num_gh; x++) {
+ error = gfs2_glock_nq(ghs + x);
+ 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(ndir, MAY_WRITE | MAY_EXEC, 0);
+ 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;
+ 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(odentry->d_inode, MAY_WRITE, 0);
+ if (error)
+ goto out_gunlock;
+ }
+
+ if (nip == NULL)
+ alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
+ error = alloc_required;
+ if (error < 0)
+ goto out_gunlock;
+ error = 0;
+
+ if (alloc_required) {
+ struct gfs2_alloc *al = gfs2_alloc_get(ndip);
+ if (!al) {
+ error = -ENOMEM;
+ goto out_gunlock;
+ }
+
+ error = gfs2_quota_lock_check(ndip);
+ if (error)
+ goto out_alloc;
+
+ al->al_requested = sdp->sd_max_dirres;
+
+ error = gfs2_inplace_reserve_ri(ndip);
+ if (error)
+ goto out_gunlock_q;
+
+ error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
+ gfs2_rg_blocks(al) +
+ 4 * RES_DINODE + 4 * RES_LEAF +
+ RES_STATFS + RES_QUOTA + 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) {
+ struct buffer_head *bh;
+ error = gfs2_meta_inode_buffer(nip, &bh);
+ if (error)
+ goto out_end_trans;
+ error = gfs2_unlink_inode(ndip, ndentry, bh);
+ brelse(bh);
+ }
+
+ if (dir_rename) {
+ error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
+ if (error)
+ goto out_end_trans;
+ } else {
+ struct buffer_head *dibh;
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto out_end_trans;
+ ip->i_inode.i_ctime = CURRENT_TIME;
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_dinode_out(ip, dibh->b_data);
+ brelse(dibh);
+ }
+
+ error = gfs2_dir_del(odip, odentry);
+ if (error)
+ goto out_end_trans;
+
+ error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
+ if (error)
+ goto out_end_trans;
+
+out_end_trans:
+ gfs2_trans_end(sdp);
+out_ipreserv:
+ if (alloc_required)
+ gfs2_inplace_release(ndip);
+out_gunlock_q:
+ if (alloc_required)
+ gfs2_quota_unlock(ndip);
+out_alloc:
+ if (alloc_required)
+ gfs2_alloc_put(ndip);
+out_gunlock:
+ while (x--) {
+ gfs2_glock_dq(ghs + x);
+ gfs2_holder_uninit(ghs + x);
+ }
+out_gunlock_r:
+ if (r_gh.gh_gl)
+ gfs2_glock_dq_uninit(&r_gh);
+out:
+ gfs2_glock_dq_uninit(&ri_gh);
+ return error;
+}
+
+/**
+ * gfs2_follow_link - Follow a symbolic link
+ * @dentry: The dentry of the link
+ * @nd: Data that we pass to vfs_follow_link()
+ *
+ * This can handle symlinks of any size.
+ *
+ * Returns: 0 on success or error code
+ */
+
+static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
+ struct gfs2_holder i_gh;
+ struct buffer_head *dibh;
+ unsigned int size;
+ char *buf;
+ int error;
+
+ 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);
+ nd_set_link(nd, ERR_PTR(error));
+ return NULL;
+ }
+
+ 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);
+ nd_set_link(nd, buf);
+ return NULL;
+}
+
+static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
+{
+ char *s = nd_get_link(nd);
+ if (!IS_ERR(s))
+ kfree(s);
+}
+
+/**
+ * gfs2_permission -
+ * @inode: The inode
+ * @mask: The mask to be tested
+ * @flags: Indicates whether this is an RCU path walk or not
+ *
+ * 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 inode *inode, int mask, unsigned int flags)
+{
+ struct gfs2_inode *ip;
+ struct gfs2_holder i_gh;
+ int error;
+ int unlock = 0;
+
+
+ ip = GFS2_I(inode);
+ if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
+ if (flags & IPERM_FLAG_RCU)
+ return -ECHILD;
+ error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
+ if (error)
+ return error;
+ unlock = 1;
+ }
+
+ if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
+ error = -EACCES;
+ else
+ error = generic_permission(inode, mask, flags, gfs2_check_acl);
+ if (unlock)
+ gfs2_glock_dq_uninit(&i_gh);
+
+ return error;
+}
+
+static int __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
+{
+ struct inode *inode = &ip->i_inode;
+ struct buffer_head *dibh;
+ int error;
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ return error;
+
+ setattr_copy(inode, attr);
+ mark_inode_dirty(inode);
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_dinode_out(ip, dibh->b_data);
+ brelse(dibh);
+ return 0;
+}
+
+/**
+ * gfs2_setattr_simple -
+ * @ip:
+ * @attr:
+ *
+ * Returns: errno
+ */
+
+int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
+{
+ int error;
+
+ if (current->journal_info)
+ return __gfs2_setattr_simple(ip, attr);
+
+ error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
+ if (error)
+ return error;
+
+ error = __gfs2_setattr_simple(ip, attr);
+ gfs2_trans_end(GFS2_SB(&ip->i_inode));
+ return error;
+}
+
+static int setattr_chown(struct inode *inode, struct iattr *attr)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ u32 ouid, ogid, nuid, ngid;
+ int error;
+
+ ouid = inode->i_uid;
+ ogid = inode->i_gid;
+ nuid = attr->ia_uid;
+ ngid = attr->ia_gid;
+
+ if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
+ ouid = nuid = NO_QUOTA_CHANGE;
+ if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
+ ogid = ngid = NO_QUOTA_CHANGE;
+
+ if (!gfs2_alloc_get(ip))
+ return -ENOMEM;
+
+ error = gfs2_quota_lock(ip, nuid, ngid);
+ if (error)
+ goto out_alloc;
+
+ if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
+ error = gfs2_quota_check(ip, nuid, ngid);
+ if (error)
+ goto out_gunlock_q;
+ }
+
+ error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
+ if (error)
+ goto out_gunlock_q;
+
+ error = gfs2_setattr_simple(ip, attr);
+ if (error)
+ goto out_end_trans;
+
+ if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
+ u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
+ gfs2_quota_change(ip, -blocks, ouid, ogid);
+ gfs2_quota_change(ip, blocks, nuid, ngid);
+ }
+
+out_end_trans:
+ gfs2_trans_end(sdp);
+out_gunlock_q:
+ gfs2_quota_unlock(ip);
+out_alloc:
+ gfs2_alloc_put(ip);
+ return error;
+}
+
+/**
+ * gfs2_setattr - Change attributes on an inode
+ * @dentry: The dentry which is changing
+ * @attr: The structure describing the change
+ *
+ * The VFS layer wants to change one or more of an inodes attributes. Write
+ * that change out to disk.
+ *
+ * Returns: errno
+ */
+
+static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
+{
+ struct inode *inode = dentry->d_inode;
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder i_gh;
+ int error;
+
+ error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
+ if (error)
+ return error;
+
+ error = -EPERM;
+ if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
+ goto out;
+
+ error = inode_change_ok(inode, attr);
+ if (error)
+ goto out;
+
+ if (attr->ia_valid & ATTR_SIZE)
+ error = gfs2_setattr_size(inode, attr->ia_size);
+ else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
+ error = setattr_chown(inode, attr);
+ else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
+ error = gfs2_acl_chmod(ip, attr);
+ else
+ error = gfs2_setattr_simple(ip, attr);
+
+out:
+ gfs2_glock_dq_uninit(&i_gh);
+ if (!error)
+ mark_inode_dirty(inode);
+ return error;
+}
+
+/**
+ * gfs2_getattr - Read out an inode's attributes
+ * @mnt: The vfsmount the inode is being accessed from
+ * @dentry: The dentry to stat
+ * @stat: The inode's stats
+ *
+ * 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 vfsmount *mnt, struct dentry *dentry,
+ struct kstat *stat)
+{
+ struct inode *inode = dentry->d_inode;
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder gh;
+ int error;
+ int unlock = 0;
+
+ 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;
+ unlock = 1;
+ }
+
+ generic_fillattr(inode, stat);
+ if (unlock)
+ gfs2_glock_dq_uninit(&gh);
+
+ return 0;
+}
+
+static int gfs2_setxattr(struct dentry *dentry, const char *name,
+ const void *data, size_t size, int flags)
+{
+ struct inode *inode = dentry->d_inode;
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder gh;
+ int ret;
+
+ gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
+ ret = gfs2_glock_nq(&gh);
+ if (ret == 0) {
+ ret = generic_setxattr(dentry, name, data, size, flags);
+ gfs2_glock_dq(&gh);
+ }
+ gfs2_holder_uninit(&gh);
+ return ret;
+}
+
+static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
+ void *data, size_t size)
+{
+ struct inode *inode = dentry->d_inode;
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder gh;
+ int ret;
+
+ gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
+ ret = gfs2_glock_nq(&gh);
+ if (ret == 0) {
+ ret = generic_getxattr(dentry, name, data, size);
+ gfs2_glock_dq(&gh);
+ }
+ gfs2_holder_uninit(&gh);
+ return ret;
+}
+
+static int gfs2_removexattr(struct dentry *dentry, const char *name)
+{
+ struct inode *inode = dentry->d_inode;
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder gh;
+ int ret;
+
+ gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
+ ret = gfs2_glock_nq(&gh);
+ if (ret == 0) {
+ ret = generic_removexattr(dentry, name);
+ gfs2_glock_dq(&gh);
+ }
+ gfs2_holder_uninit(&gh);
+ return ret;
+}
+
+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;
+
+ ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
+ if (ret)
+ return ret;
+
+ mutex_lock(&inode->i_mutex);
+
+ ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
+ if (ret)
+ goto out;
+
+ if (gfs2_is_stuffed(ip)) {
+ u64 phys = ip->i_no_addr << inode->i_blkbits;
+ u64 size = i_size_read(inode);
+ u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
+ FIEMAP_EXTENT_DATA_INLINE;
+ phys += sizeof(struct gfs2_dinode);
+ phys += start;
+ if (start + len > size)
+ len = size - start;
+ if (start < size)
+ ret = fiemap_fill_next_extent(fieinfo, start, phys,
+ len, flags);
+ if (ret == 1)
+ ret = 0;
+ } else {
+ ret = __generic_block_fiemap(inode, fieinfo, start, len,
+ gfs2_block_map);
+ }
+
+ gfs2_glock_dq_uninit(&gh);
+out:
+ mutex_unlock(&inode->i_mutex);
+ return ret;
+}
+
+const struct inode_operations gfs2_file_iops = {
+ .permission = gfs2_permission,
+ .setattr = gfs2_setattr,
+ .getattr = gfs2_getattr,
+ .setxattr = gfs2_setxattr,
+ .getxattr = gfs2_getxattr,
+ .listxattr = gfs2_listxattr,
+ .removexattr = gfs2_removexattr,
+ .fiemap = gfs2_fiemap,
+};
+
+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_rename,
+ .permission = gfs2_permission,
+ .setattr = gfs2_setattr,
+ .getattr = gfs2_getattr,
+ .setxattr = gfs2_setxattr,
+ .getxattr = gfs2_getxattr,
+ .listxattr = gfs2_listxattr,
+ .removexattr = gfs2_removexattr,
+ .fiemap = gfs2_fiemap,
+};
+
+const struct inode_operations gfs2_symlink_iops = {
+ .readlink = generic_readlink,
+ .follow_link = gfs2_follow_link,
+ .put_link = gfs2_put_link,
+ .permission = gfs2_permission,
+ .setattr = gfs2_setattr,
+ .getattr = gfs2_getattr,
+ .setxattr = gfs2_setxattr,
+ .getxattr = gfs2_getxattr,
+ .listxattr = gfs2_listxattr,
+ .removexattr = gfs2_removexattr,
+ .fiemap = gfs2_fiemap,
+};
+
projects / firefly-linux-kernel-4.4.55.git / blobdiff