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path: root/fs/gfs2/ops_inode.c
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-rw-r--r--fs/gfs2/ops_inode.c1151
1 files changed, 1151 insertions, 0 deletions
diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
new file mode 100644
index 00000000000..ef6e5ed70e9
--- /dev/null
+++ b/fs/gfs2/ops_inode.c
@@ -0,0 +1,1151 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License version 2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/namei.h>
+#include <linux/utsname.h>
+#include <linux/mm.h>
+#include <linux/xattr.h>
+#include <linux/posix_acl.h>
+#include <linux/gfs2_ondisk.h>
+#include <linux/crc32.h>
+#include <linux/lm_interface.h>
+#include <asm/uaccess.h>
+
+#include "gfs2.h"
+#include "incore.h"
+#include "acl.h"
+#include "bmap.h"
+#include "dir.h"
+#include "eaops.h"
+#include "eattr.h"
+#include "glock.h"
+#include "inode.h"
+#include "meta_io.h"
+#include "ops_dentry.h"
+#include "ops_inode.h"
+#include "quota.h"
+#include "rgrp.h"
+#include "trans.h"
+#include "util.h"
+
+/**
+ * gfs2_create - Create a file
+ * @dir: The directory in which to create the file
+ * @dentry: The dentry of the new file
+ * @mode: The mode of the new file
+ *
+ * Returns: errno
+ */
+
+static int gfs2_create(struct inode *dir, struct dentry *dentry,
+ int mode, struct nameidata *nd)
+{
+ struct gfs2_inode *dip = GFS2_I(dir);
+ struct gfs2_sbd *sdp = GFS2_SB(dir);
+ struct gfs2_holder ghs[2];
+ struct inode *inode;
+
+ gfs2_holder_init(dip->i_gl, 0, 0, ghs);
+
+ for (;;) {
+ inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode);
+ if (!IS_ERR(inode)) {
+ gfs2_trans_end(sdp);
+ if (dip->i_alloc.al_rgd)
+ gfs2_inplace_release(dip);
+ gfs2_quota_unlock(dip);
+ gfs2_alloc_put(dip);
+ gfs2_glock_dq_uninit_m(2, ghs);
+ mark_inode_dirty(inode);
+ break;
+ } else if (PTR_ERR(inode) != -EEXIST ||
+ (nd->intent.open.flags & O_EXCL)) {
+ gfs2_holder_uninit(ghs);
+ return PTR_ERR(inode);
+ }
+
+ inode = gfs2_lookupi(dir, &dentry->d_name, 0, nd);
+ if (inode) {
+ if (!IS_ERR(inode)) {
+ gfs2_holder_uninit(ghs);
+ break;
+ } else {
+ gfs2_holder_uninit(ghs);
+ 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;
+
+ dentry->d_op = &gfs2_dops;
+
+ inode = gfs2_lookupi(dir, &dentry->d_name, 0, nd);
+ if (inode && IS_ERR(inode))
+ return ERR_PTR(PTR_ERR(inode));
+
+ if (inode)
+ return d_splice_alias(inode, dentry);
+ d_add(dentry, inode);
+
+ return NULL;
+}
+
+/**
+ * gfs2_link - Link to a file
+ * @old_dentry: The inode to link
+ * @dir: Add link to this directory
+ * @dentry: The name of the link
+ *
+ * Link the inode in "old_dentry" into the directory "dir" with the
+ * name in "dentry".
+ *
+ * Returns: errno
+ */
+
+static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
+ struct dentry *dentry)
+{
+ struct gfs2_inode *dip = 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];
+ int alloc_required;
+ int error;
+
+ if (S_ISDIR(ip->i_di.di_mode))
+ return -EPERM;
+
+ gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
+ gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
+
+ error = gfs2_glock_nq_m(2, ghs);
+ if (error)
+ goto out;
+
+ error = permission(dir, MAY_WRITE | MAY_EXEC, NULL);
+ if (error)
+ goto out_gunlock;
+
+ error = gfs2_dir_search(dir, &dentry->d_name, NULL, NULL);
+ switch (error) {
+ case -ENOENT:
+ break;
+ case 0:
+ error = -EEXIST;
+ default:
+ goto out_gunlock;
+ }
+
+ error = -EINVAL;
+ if (!dip->i_di.di_nlink)
+ goto out_gunlock;
+ error = -EFBIG;
+ if (dip->i_di.di_entries == (u32)-1)
+ goto out_gunlock;
+ error = -EPERM;
+ if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
+ goto out_gunlock;
+ error = -EINVAL;
+ if (!ip->i_di.di_nlink)
+ goto out_gunlock;
+ error = -EMLINK;
+ if (ip->i_di.di_nlink == (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);
+
+ error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+ if (error)
+ goto out_alloc;
+
+ error = gfs2_quota_check(dip, dip->i_di.di_uid,
+ dip->i_di.di_gid);
+ if (error)
+ goto out_gunlock_q;
+
+ al->al_requested = sdp->sd_max_dirres;
+
+ error = gfs2_inplace_reserve(dip);
+ if (error)
+ goto out_gunlock_q;
+
+ error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
+ al->al_rgd->rd_ri.ri_length +
+ 2 * RES_DINODE + RES_STATFS +
+ RES_QUOTA, 0);
+ if (error)
+ goto out_ipres;
+ } else {
+ error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
+ if (error)
+ goto out_ipres;
+ }
+
+ error = gfs2_dir_add(dir, &dentry->d_name, &ip->i_num,
+ IF2DT(ip->i_di.di_mode));
+ if (error)
+ goto out_end_trans;
+
+ error = gfs2_change_nlink(ip, +1);
+
+out_end_trans:
+ gfs2_trans_end(sdp);
+out_ipres:
+ if (alloc_required)
+ gfs2_inplace_release(dip);
+out_gunlock_q:
+ if (alloc_required)
+ gfs2_quota_unlock(dip);
+out_alloc:
+ if (alloc_required)
+ gfs2_alloc_put(dip);
+out_gunlock:
+ gfs2_glock_dq_m(2, ghs);
+out:
+ gfs2_holder_uninit(ghs);
+ gfs2_holder_uninit(ghs + 1);
+ if (!error) {
+ atomic_inc(&inode->i_count);
+ d_instantiate(dentry, inode);
+ mark_inode_dirty(inode);
+ }
+ return error;
+}
+
+/**
+ * gfs2_unlink - Unlink a file
+ * @dir: The inode of the directory containing the file to unlink
+ * @dentry: The file itself
+ *
+ * Unlink a file. Call gfs2_unlinki()
+ *
+ * Returns: errno
+ */
+
+static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct gfs2_inode *dip = GFS2_I(dir);
+ struct gfs2_sbd *sdp = GFS2_SB(dir);
+ struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
+ struct gfs2_holder ghs[2];
+ int error;
+
+ gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
+ gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
+
+ error = gfs2_glock_nq_m(2, ghs);
+ if (error)
+ goto out;
+
+ error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
+ if (error)
+ goto out_gunlock;
+
+ error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
+ if (error)
+ goto out_gunlock;
+
+ error = gfs2_dir_del(dip, &dentry->d_name);
+ if (error)
+ goto out_end_trans;
+
+ error = gfs2_change_nlink(ip, -1);
+
+out_end_trans:
+ gfs2_trans_end(sdp);
+out_gunlock:
+ gfs2_glock_dq_m(2, ghs);
+out:
+ gfs2_holder_uninit(ghs);
+ gfs2_holder_uninit(ghs + 1);
+ return error;
+}
+
+/**
+ * gfs2_symlink - Create a symlink
+ * @dir: The directory to create the symlink in
+ * @dentry: The dentry to put the symlink in
+ * @symname: The thing which the link points to
+ *
+ * Returns: errno
+ */
+
+static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
+ const char *symname)
+{
+ struct gfs2_inode *dip = GFS2_I(dir), *ip;
+ struct gfs2_sbd *sdp = GFS2_SB(dir);
+ struct gfs2_holder ghs[2];
+ struct inode *inode;
+ struct buffer_head *dibh;
+ int size;
+ int error;
+
+ /* Must be stuffed with a null terminator for gfs2_follow_link() */
+ size = strlen(symname);
+ if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
+ return -ENAMETOOLONG;
+
+ gfs2_holder_init(dip->i_gl, 0, 0, ghs);
+
+ inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO);
+ if (IS_ERR(inode)) {
+ gfs2_holder_uninit(ghs);
+ return PTR_ERR(inode);
+ }
+
+ ip = ghs[1].gh_gl->gl_object;
+
+ ip->i_di.di_size = size;
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+
+ if (!gfs2_assert_withdraw(sdp, !error)) {
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
+ size);
+ brelse(dibh);
+ }
+
+ gfs2_trans_end(sdp);
+ if (dip->i_alloc.al_rgd)
+ gfs2_inplace_release(dip);
+ gfs2_quota_unlock(dip);
+ gfs2_alloc_put(dip);
+
+ gfs2_glock_dq_uninit_m(2, ghs);
+
+ d_instantiate(dentry, inode);
+ mark_inode_dirty(inode);
+
+ return 0;
+}
+
+/**
+ * gfs2_mkdir - Make a directory
+ * @dir: The parent directory of the new one
+ * @dentry: The dentry of the new directory
+ * @mode: The mode of the new directory
+ *
+ * Returns: errno
+ */
+
+static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+ struct gfs2_inode *dip = GFS2_I(dir), *ip;
+ struct gfs2_sbd *sdp = GFS2_SB(dir);
+ struct gfs2_holder ghs[2];
+ struct inode *inode;
+ struct buffer_head *dibh;
+ int error;
+
+ gfs2_holder_init(dip->i_gl, 0, 0, ghs);
+
+ inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode);
+ if (IS_ERR(inode)) {
+ gfs2_holder_uninit(ghs);
+ return PTR_ERR(inode);
+ }
+
+ ip = ghs[1].gh_gl->gl_object;
+
+ ip->i_di.di_nlink = 2;
+ ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
+ ip->i_di.di_flags |= GFS2_DIF_JDATA;
+ ip->i_di.di_payload_format = GFS2_FORMAT_DE;
+ ip->i_di.di_entries = 2;
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+
+ if (!gfs2_assert_withdraw(sdp, !error)) {
+ struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
+ struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
+ struct qstr str;
+
+ gfs2_str2qstr(&str, ".");
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
+ dent->de_inum = di->di_num; /* already GFS2 endian */
+ dent->de_type = cpu_to_be16(DT_DIR);
+ di->di_entries = cpu_to_be32(1);
+
+ gfs2_str2qstr(&str, "..");
+ dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
+ gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
+
+ gfs2_inum_out(&dip->i_num, &dent->de_inum);
+ dent->de_type = cpu_to_be16(DT_DIR);
+
+ gfs2_dinode_out(&ip->i_di, di);
+
+ brelse(dibh);
+ }
+
+ error = gfs2_change_nlink(dip, +1);
+ gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
+
+ gfs2_trans_end(sdp);
+ if (dip->i_alloc.al_rgd)
+ gfs2_inplace_release(dip);
+ gfs2_quota_unlock(dip);
+ gfs2_alloc_put(dip);
+
+ gfs2_glock_dq_uninit_m(2, ghs);
+
+ d_instantiate(dentry, inode);
+ mark_inode_dirty(inode);
+
+ return 0;
+}
+
+/**
+ * gfs2_rmdir - Remove a directory
+ * @dir: The parent directory of the directory to be removed
+ * @dentry: The dentry of the directory to remove
+ *
+ * Remove a directory. Call gfs2_rmdiri()
+ *
+ * Returns: errno
+ */
+
+static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ struct gfs2_inode *dip = GFS2_I(dir);
+ struct gfs2_sbd *sdp = GFS2_SB(dir);
+ struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
+ struct gfs2_holder ghs[2];
+ int error;
+
+ gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
+ gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
+
+ error = gfs2_glock_nq_m(2, ghs);
+ if (error)
+ goto out;
+
+ error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
+ if (error)
+ goto out_gunlock;
+
+ if (ip->i_di.di_entries < 2) {
+ if (gfs2_consist_inode(ip))
+ gfs2_dinode_print(&ip->i_di);
+ error = -EIO;
+ goto out_gunlock;
+ }
+ if (ip->i_di.di_entries > 2) {
+ error = -ENOTEMPTY;
+ goto out_gunlock;
+ }
+
+ error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
+ if (error)
+ goto out_gunlock;
+
+ error = gfs2_rmdiri(dip, &dentry->d_name, ip);
+
+ gfs2_trans_end(sdp);
+
+out_gunlock:
+ gfs2_glock_dq_m(2, ghs);
+out:
+ gfs2_holder_uninit(ghs);
+ gfs2_holder_uninit(ghs + 1);
+ return error;
+}
+
+/**
+ * gfs2_mknod - Make a special file
+ * @dir: The directory in which the special file will reside
+ * @dentry: The dentry of the special file
+ * @mode: The mode of the special file
+ * @rdev: The device specification of the special file
+ *
+ */
+
+static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
+ dev_t dev)
+{
+ struct gfs2_inode *dip = GFS2_I(dir), *ip;
+ struct gfs2_sbd *sdp = GFS2_SB(dir);
+ struct gfs2_holder ghs[2];
+ struct inode *inode;
+ struct buffer_head *dibh;
+ u32 major = 0, minor = 0;
+ int error;
+
+ switch (mode & S_IFMT) {
+ case S_IFBLK:
+ case S_IFCHR:
+ major = MAJOR(dev);
+ minor = MINOR(dev);
+ break;
+ case S_IFIFO:
+ case S_IFSOCK:
+ break;
+ default:
+ return -EOPNOTSUPP;
+ };
+
+ gfs2_holder_init(dip->i_gl, 0, 0, ghs);
+
+ inode = gfs2_createi(ghs, &dentry->d_name, mode);
+ if (IS_ERR(inode)) {
+ gfs2_holder_uninit(ghs);
+ return PTR_ERR(inode);
+ }
+
+ ip = ghs[1].gh_gl->gl_object;
+
+ ip->i_di.di_major = major;
+ ip->i_di.di_minor = minor;
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+
+ if (!gfs2_assert_withdraw(sdp, !error)) {
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
+ }
+
+ gfs2_trans_end(sdp);
+ if (dip->i_alloc.al_rgd)
+ gfs2_inplace_release(dip);
+ gfs2_quota_unlock(dip);
+ gfs2_alloc_put(dip);
+
+ gfs2_glock_dq_uninit_m(2, ghs);
+
+ d_instantiate(dentry, inode);
+ mark_inode_dirty(inode);
+
+ return 0;
+}
+
+/**
+ * gfs2_rename - Rename a file
+ * @odir: Parent directory of old file name
+ * @odentry: The old dentry of the file
+ * @ndir: Parent directory of new file name
+ * @ndentry: The new dentry of the file
+ *
+ * Returns: errno
+ */
+
+static int gfs2_rename(struct inode *odir, struct dentry *odentry,
+ struct inode *ndir, struct dentry *ndentry)
+{
+ struct gfs2_inode *odip = 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[4], r_gh;
+ unsigned int num_gh;
+ int dir_rename = 0;
+ int alloc_required;
+ unsigned int x;
+ int error;
+
+ if (ndentry->d_inode) {
+ nip = GFS2_I(ndentry->d_inode);
+ if (ip == nip)
+ return 0;
+ }
+
+ /* Make sure we aren't trying to move a dirctory into it's subdir */
+
+ if (S_ISDIR(ip->i_di.di_mode) && odip != ndip) {
+ dir_rename = 1;
+
+ error = gfs2_glock_nq_init(sdp->sd_rename_gl,
+ LM_ST_EXCLUSIVE, 0,
+ &r_gh);
+ if (error)
+ goto out;
+
+ error = gfs2_ok_to_move(ip, ndip);
+ if (error)
+ goto out_gunlock_r;
+ }
+
+ 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++;
+ }
+
+ error = gfs2_glock_nq_m(num_gh, ghs);
+ if (error)
+ goto out_uninit;
+
+ /* Check out the old directory */
+
+ error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
+ if (error)
+ goto out_gunlock;
+
+ /* Check out the new directory */
+
+ if (nip) {
+ error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
+ if (error)
+ goto out_gunlock;
+
+ if (S_ISDIR(nip->i_di.di_mode)) {
+ if (nip->i_di.di_entries < 2) {
+ if (gfs2_consist_inode(nip))
+ gfs2_dinode_print(&nip->i_di);
+ error = -EIO;
+ goto out_gunlock;
+ }
+ if (nip->i_di.di_entries > 2) {
+ error = -ENOTEMPTY;
+ goto out_gunlock;
+ }
+ }
+ } else {
+ error = permission(ndir, MAY_WRITE | MAY_EXEC, NULL);
+ if (error)
+ goto out_gunlock;
+
+ error = gfs2_dir_search(ndir, &ndentry->d_name, NULL, NULL);
+ switch (error) {
+ case -ENOENT:
+ error = 0;
+ break;
+ case 0:
+ error = -EEXIST;
+ default:
+ goto out_gunlock;
+ };
+
+ if (odip != ndip) {
+ if (!ndip->i_di.di_nlink) {
+ error = -EINVAL;
+ goto out_gunlock;
+ }
+ if (ndip->i_di.di_entries == (u32)-1) {
+ error = -EFBIG;
+ goto out_gunlock;
+ }
+ if (S_ISDIR(ip->i_di.di_mode) &&
+ ndip->i_di.di_nlink == (u32)-1) {
+ error = -EMLINK;
+ goto out_gunlock;
+ }
+ }
+ }
+
+ /* Check out the dir to be renamed */
+
+ if (dir_rename) {
+ error = permission(odentry->d_inode, MAY_WRITE, NULL);
+ if (error)
+ goto out_gunlock;
+ }
+
+ alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
+ if (error < 0)
+ goto out_gunlock;
+ error = 0;
+
+ if (alloc_required) {
+ struct gfs2_alloc *al = gfs2_alloc_get(ndip);
+
+ error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+ if (error)
+ goto out_alloc;
+
+ error = gfs2_quota_check(ndip, ndip->i_di.di_uid,
+ ndip->i_di.di_gid);
+ if (error)
+ goto out_gunlock_q;
+
+ al->al_requested = sdp->sd_max_dirres;
+
+ error = gfs2_inplace_reserve(ndip);
+ if (error)
+ goto out_gunlock_q;
+
+ error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
+ al->al_rgd->rd_ri.ri_length +
+ 4 * RES_DINODE + 4 * RES_LEAF +
+ RES_STATFS + RES_QUOTA, 0);
+ if (error)
+ goto out_ipreserv;
+ } else {
+ error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
+ 5 * RES_LEAF, 0);
+ if (error)
+ goto out_gunlock;
+ }
+
+ /* Remove the target file, if it exists */
+
+ if (nip) {
+ if (S_ISDIR(nip->i_di.di_mode))
+ error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
+ else {
+ error = gfs2_dir_del(ndip, &ndentry->d_name);
+ if (error)
+ goto out_end_trans;
+ error = gfs2_change_nlink(nip, -1);
+ }
+ if (error)
+ goto out_end_trans;
+ }
+
+ if (dir_rename) {
+ struct qstr name;
+ gfs2_str2qstr(&name, "..");
+
+ error = gfs2_change_nlink(ndip, +1);
+ if (error)
+ goto out_end_trans;
+ error = gfs2_change_nlink(odip, -1);
+ if (error)
+ goto out_end_trans;
+
+ error = gfs2_dir_mvino(ip, &name, &ndip->i_num, DT_DIR);
+ if (error)
+ goto out_end_trans;
+ } else {
+ struct buffer_head *dibh;
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto out_end_trans;
+ ip->i_di.di_ctime = get_seconds();
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
+ }
+
+ error = gfs2_dir_del(odip, &odentry->d_name);
+ if (error)
+ goto out_end_trans;
+
+ error = gfs2_dir_add(ndir, &ndentry->d_name, &ip->i_num,
+ IF2DT(ip->i_di.di_mode));
+ if (error)
+ goto out_end_trans;
+
+out_end_trans:
+ gfs2_trans_end(sdp);
+out_ipreserv:
+ if (alloc_required)
+ gfs2_inplace_release(ndip);
+out_gunlock_q:
+ if (alloc_required)
+ gfs2_quota_unlock(ndip);
+out_alloc:
+ if (alloc_required)
+ gfs2_alloc_put(ndip);
+out_gunlock:
+ gfs2_glock_dq_m(num_gh, ghs);
+out_uninit:
+ for (x = 0; x < num_gh; x++)
+ gfs2_holder_uninit(ghs + x);
+out_gunlock_r:
+ if (dir_rename)
+ gfs2_glock_dq_uninit(&r_gh);
+out:
+ return error;
+}
+
+/**
+ * gfs2_readlink - Read the value of a symlink
+ * @dentry: the symlink
+ * @buf: the buffer to read the symlink data into
+ * @size: the size of the buffer
+ *
+ * Returns: errno
+ */
+
+static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
+ int user_size)
+{
+ struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
+ char array[GFS2_FAST_NAME_SIZE], *buf = array;
+ unsigned int len = GFS2_FAST_NAME_SIZE;
+ int error;
+
+ error = gfs2_readlinki(ip, &buf, &len);
+ if (error)
+ return error;
+
+ if (user_size > len - 1)
+ user_size = len - 1;
+
+ if (copy_to_user(user_buf, buf, user_size))
+ error = -EFAULT;
+ else
+ error = user_size;
+
+ if (buf != array)
+ kfree(buf);
+
+ return error;
+}
+
+/**
+ * gfs2_follow_link - Follow a symbolic link
+ * @dentry: The dentry of the link
+ * @nd: Data that we pass to vfs_follow_link()
+ *
+ * This can handle symlinks of any size. It is optimised for symlinks
+ * under GFS2_FAST_NAME_SIZE.
+ *
+ * Returns: 0 on success or error code
+ */
+
+static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
+ char array[GFS2_FAST_NAME_SIZE], *buf = array;
+ unsigned int len = GFS2_FAST_NAME_SIZE;
+ int error;
+
+ error = gfs2_readlinki(ip, &buf, &len);
+ if (!error) {
+ error = vfs_follow_link(nd, buf);
+ if (buf != array)
+ kfree(buf);
+ }
+
+ return ERR_PTR(error);
+}
+
+/**
+ * gfs2_permission -
+ * @inode:
+ * @mask:
+ * @nd: passed from Linux VFS, ignored by us
+ *
+ * Returns: errno
+ */
+
+static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder i_gh;
+ int error;
+
+ if (ip->i_vn == ip->i_gl->gl_vn)
+ return generic_permission(inode, mask, gfs2_check_acl);
+
+ error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
+ if (!error) {
+ error = generic_permission(inode, mask, gfs2_check_acl_locked);
+ gfs2_glock_dq_uninit(&i_gh);
+ }
+
+ return error;
+}
+
+static int setattr_size(struct inode *inode, struct iattr *attr)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ int error;
+
+ if (attr->ia_size != ip->i_di.di_size) {
+ error = vmtruncate(inode, attr->ia_size);
+ if (error)
+ return error;
+ }
+
+ error = gfs2_truncatei(ip, attr->ia_size);
+ if (error)
+ return error;
+
+ return error;
+}
+
+static int setattr_chown(struct inode *inode, struct iattr *attr)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ struct buffer_head *dibh;
+ u32 ouid, ogid, nuid, ngid;
+ int error;
+
+ ouid = ip->i_di.di_uid;
+ ogid = ip->i_di.di_gid;
+ nuid = attr->ia_uid;
+ ngid = attr->ia_gid;
+
+ if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
+ ouid = nuid = NO_QUOTA_CHANGE;
+ if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
+ ogid = ngid = NO_QUOTA_CHANGE;
+
+ gfs2_alloc_get(ip);
+
+ error = gfs2_quota_lock(ip, nuid, ngid);
+ if (error)
+ goto out_alloc;
+
+ if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
+ error = gfs2_quota_check(ip, nuid, ngid);
+ if (error)
+ goto out_gunlock_q;
+ }
+
+ error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
+ if (error)
+ goto out_gunlock_q;
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto out_end_trans;
+
+ error = inode_setattr(inode, attr);
+ gfs2_assert_warn(sdp, !error);
+ gfs2_inode_attr_out(ip);
+
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
+
+ if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
+ gfs2_quota_change(ip, -ip->i_di.di_blocks, ouid, ogid);
+ gfs2_quota_change(ip, ip->i_di.di_blocks, nuid, ngid);
+ }
+
+out_end_trans:
+ gfs2_trans_end(sdp);
+out_gunlock_q:
+ gfs2_quota_unlock(ip);
+out_alloc:
+ gfs2_alloc_put(ip);
+ return error;
+}
+
+/**
+ * gfs2_setattr - Change attributes on an inode
+ * @dentry: The dentry which is changing
+ * @attr: The structure describing the change
+ *
+ * The VFS layer wants to change one or more of an inodes attributes. Write
+ * that change out to disk.
+ *
+ * Returns: errno
+ */
+
+static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
+{
+ struct inode *inode = dentry->d_inode;
+ struct gfs2_inode *ip = 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 = setattr_size(inode, attr);
+ else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
+ error = setattr_chown(inode, attr);
+ else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
+ error = gfs2_acl_chmod(ip, attr);
+ else
+ error = gfs2_setattr_simple(ip, attr);
+
+out:
+ gfs2_glock_dq_uninit(&i_gh);
+ if (!error)
+ mark_inode_dirty(inode);
+ return error;
+}
+
+/**
+ * gfs2_getattr - Read out an inode's attributes
+ * @mnt: The vfsmount the inode is being accessed from
+ * @dentry: The dentry to stat
+ * @stat: The inode's stats
+ *
+ * Returns: errno
+ */
+
+static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
+ struct kstat *stat)
+{
+ struct inode *inode = dentry->d_inode;
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder gh;
+ int error;
+
+ error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
+ if (!error) {
+ generic_fillattr(inode, stat);
+ gfs2_glock_dq_uninit(&gh);
+ }
+
+ return error;
+}
+
+static int gfs2_setxattr(struct dentry *dentry, const char *name,
+ const void *data, size_t size, int flags)
+{
+ struct inode *inode = dentry->d_inode;
+ struct gfs2_ea_request er;
+
+ memset(&er, 0, sizeof(struct gfs2_ea_request));
+ er.er_type = gfs2_ea_name2type(name, &er.er_name);
+ if (er.er_type == GFS2_EATYPE_UNUSED)
+ return -EOPNOTSUPP;
+ er.er_data = (char *)data;
+ er.er_name_len = strlen(er.er_name);
+ er.er_data_len = size;
+ er.er_flags = flags;
+
+ gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
+
+ return gfs2_ea_set(GFS2_I(inode), &er);
+}
+
+static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
+ void *data, size_t size)
+{
+ struct gfs2_ea_request er;
+
+ memset(&er, 0, sizeof(struct gfs2_ea_request));
+ er.er_type = gfs2_ea_name2type(name, &er.er_name);
+ if (er.er_type == GFS2_EATYPE_UNUSED)
+ return -EOPNOTSUPP;
+ er.er_data = data;
+ er.er_name_len = strlen(er.er_name);
+ er.er_data_len = size;
+
+ return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
+}
+
+static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
+{
+ struct gfs2_ea_request er;
+
+ memset(&er, 0, sizeof(struct gfs2_ea_request));
+ er.er_data = (size) ? buffer : NULL;
+ er.er_data_len = size;
+
+ return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
+}
+
+static int gfs2_removexattr(struct dentry *dentry, const char *name)
+{
+ struct gfs2_ea_request er;
+
+ memset(&er, 0, sizeof(struct gfs2_ea_request));
+ er.er_type = gfs2_ea_name2type(name, &er.er_name);
+ if (er.er_type == GFS2_EATYPE_UNUSED)
+ return -EOPNOTSUPP;
+ er.er_name_len = strlen(er.er_name);
+
+ return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
+}
+
+struct inode_operations gfs2_file_iops = {
+ .permission = gfs2_permission,
+ .setattr = gfs2_setattr,
+ .getattr = gfs2_getattr,
+ .setxattr = gfs2_setxattr,
+ .getxattr = gfs2_getxattr,
+ .listxattr = gfs2_listxattr,
+ .removexattr = gfs2_removexattr,
+};
+
+struct inode_operations gfs2_dev_iops = {
+ .permission = gfs2_permission,
+ .setattr = gfs2_setattr,
+ .getattr = gfs2_getattr,
+ .setxattr = gfs2_setxattr,
+ .getxattr = gfs2_getxattr,
+ .listxattr = gfs2_listxattr,
+ .removexattr = gfs2_removexattr,
+};
+
+struct inode_operations gfs2_dir_iops = {
+ .create = gfs2_create,
+ .lookup = gfs2_lookup,
+ .link = gfs2_link,
+ .unlink = gfs2_unlink,
+ .symlink = gfs2_symlink,
+ .mkdir = gfs2_mkdir,
+ .rmdir = gfs2_rmdir,
+ .mknod = gfs2_mknod,
+ .rename = gfs2_rename,
+ .permission = gfs2_permission,
+ .setattr = gfs2_setattr,
+ .getattr = gfs2_getattr,
+ .setxattr = gfs2_setxattr,
+ .getxattr = gfs2_getxattr,
+ .listxattr = gfs2_listxattr,
+ .removexattr = gfs2_removexattr,
+};
+
+struct inode_operations gfs2_symlink_iops = {
+ .readlink = gfs2_readlink,
+ .follow_link = gfs2_follow_link,
+ .permission = gfs2_permission,
+ .setattr = gfs2_setattr,
+ .getattr = gfs2_getattr,
+ .setxattr = gfs2_setxattr,
+ .getxattr = gfs2_getxattr,
+ .listxattr = gfs2_listxattr,
+ .removexattr = gfs2_removexattr,
+};
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-18 00:09:38 +0000