--- /dev/null
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 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/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/gfs2_ondisk.h>
+#include <linux/crc32.h>
+#include <linux/fiemap.h>
+#include <linux/security.h>
+#include <asm/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"
+
+struct gfs2_skip_data {
+ u64 no_addr;
+ int skipped;
+ int non_block;
+};
+
+static int iget_test(struct inode *inode, void *opaque)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_skip_data *data = opaque;
+
+ if (ip->i_no_addr == data->no_addr) {
+ if (data->non_block &&
+ inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
+ data->skipped = 1;
+ return 0;
+ }
+ return 1;
+ }
+ return 0;
+}
+
+static int iget_set(struct inode *inode, void *opaque)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_skip_data *data = opaque;
+
+ if (data->skipped)
+ return -ENOENT;
+ inode->i_ino = (unsigned long)(data->no_addr);
+ ip->i_no_addr = data->no_addr;
+ return 0;
+}
+
+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 = non_block;
+ return ilookup5(sb, hash, iget_test, &data);
+}
+
+static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr,
+ int non_block)
+{
+ struct gfs2_skip_data data;
+ unsigned long hash = (unsigned long)no_addr;
+
+ data.no_addr = no_addr;
+ data.skipped = 0;
+ data.non_block = non_block;
+ return iget5_locked(sb, hash, iget_test, iget_set, &data);
+}
+
+/**
+ * gfs2_set_iop - Sets inode operations
+ * @inode: The inode with correct i_mode filled in
+ *
+ * GFS2 lookup code fills in vfs inode contents based on info obtained
+ * from directory entry inside gfs2_inode_lookup().
+ */
+
+static void gfs2_set_iop(struct inode *inode)
+{
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ umode_t mode = inode->i_mode;
+
+ if (S_ISREG(mode)) {
+ inode->i_op = &gfs2_file_iops;
+ if (gfs2_localflocks(sdp))
+ inode->i_fop = &gfs2_file_fops_nolock;
+ else
+ inode->i_fop = &gfs2_file_fops;
+ } else if (S_ISDIR(mode)) {
+ inode->i_op = &gfs2_dir_iops;
+ if (gfs2_localflocks(sdp))
+ inode->i_fop = &gfs2_dir_fops_nolock;
+ else
+ inode->i_fop = &gfs2_dir_fops;
+ } else if (S_ISLNK(mode)) {
+ inode->i_op = &gfs2_symlink_iops;
+ } else {
+ inode->i_op = &gfs2_file_iops;
+ init_special_inode(inode, inode->i_mode, inode->i_rdev);
+ }
+}
+
+/**
+ * gfs2_inode_lookup - Lookup an inode
+ * @sb: The super block
+ * @no_addr: The inode number
+ * @type: The type of the inode
+ * non_block: Can we block on inodes that are being freed?
+ *
+ * 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, int non_block)
+{
+ struct inode *inode;
+ struct gfs2_inode *ip;
+ struct gfs2_glock *io_gl = NULL;
+ int error;
+
+ inode = gfs2_iget(sb, no_addr, non_block);
+ ip = GFS2_I(inode);
+
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+
+ if (inode->i_state & I_NEW) {
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ ip->i_no_formal_ino = no_formal_ino;
+
+ error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
+ if (unlikely(error))
+ goto fail;
+ ip->i_gl->gl_object = ip;
+
+ error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
+ if (unlikely(error))
+ goto fail_put;
+
+ set_bit(GIF_INVALID, &ip->i_flags);
+ error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
+ if (unlikely(error))
+ goto fail_iopen;
+
+ ip->i_iopen_gh.gh_gl->gl_object = ip;
+ gfs2_glock_put(io_gl);
+ io_gl = NULL;
+
+ if (type == DT_UNKNOWN) {
+ /* Inode glock must be locked already */
+ error = gfs2_inode_refresh(GFS2_I(inode));
+ if (error)
+ goto fail_refresh;
+ } else {
+ inode->i_mode = DT2IF(type);
+ }
+
+ gfs2_set_iop(inode);
+ unlock_new_inode(inode);
+ }
+
+ return inode;
+
+fail_refresh:
+ ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
+ ip->i_iopen_gh.gh_gl->gl_object = NULL;
+ gfs2_glock_dq_uninit(&ip->i_iopen_gh);
+fail_iopen:
+ if (io_gl)
+ gfs2_glock_put(io_gl);
+fail_put:
+ ip->i_gl->gl_object = NULL;
+ gfs2_glock_put(ip->i_gl);
+fail:
+ iget_failed(inode);
+ return ERR_PTR(error);
+}
+
+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 gfs2_holder i_gh;
+ struct inode *inode = NULL;
+ int error;
+
+ /* Must not read in block until block type is verified */
+ error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
+ LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
+ if (error)
+ return ERR_PTR(error);
+
+ error = gfs2_check_blk_type(sdp, no_addr, blktype);
+ if (error)
+ goto fail;
+
+ inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
+ if (IS_ERR(inode))
+ goto fail;
+
+ /* Two extra checks for NFS only */
+ if (no_formal_ino) {
+ error = -ESTALE;
+ if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
+ goto fail_iput;
+
+ error = -EIO;
+ if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
+ goto fail_iput;
+
+ error = 0;
+ }
+
+fail:
+ gfs2_glock_dq_uninit(&i_gh);
+ return error ? ERR_PTR(error) : inode;
+fail_iput:
+ iput(inode);
+ goto fail;
+}
+
+
+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
+ * @d_gh: An initialized holder for the directory glock
+ * @name: The name of the inode to look for
+ * @is_root: If 1, ignore the caller's permissions
+ * @i_gh: An uninitialized holder for the new inode glock
+ *
+ * This can be called via the VFS filldir function when NFS is doing
+ * a readdirplus and the inode which its intending to stat isn't
+ * already in cache. In this case we must not take the directory glock
+ * again, since the readdir call will have already taken that lock.
+ *
+ * Returns: errno
+ */
+
+struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
+ int is_root)
+{
+ struct 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;
+ int unlock = 0;
+
+ if (!name->len || name->len > GFS2_FNAMESIZE)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
+ (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
+ dir == 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);
+ unlock = 1;
+ }
+
+ if (!is_root) {
+ error = gfs2_permission(dir, MAY_EXEC);
+ if (error)
+ goto out;
+ }
+
+ inode = gfs2_dir_search(dir, name, false);
+ if (IS_ERR(inode))
+ error = PTR_ERR(inode);
+out:
+ if (unlock)
+ 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(&dip->i_inode, MAY_WRITE | MAY_EXEC);
+ if (error)
+ return error;
+
+ /* Don't create entries in an unlinked directory */
+ if (!dip->i_inode.i_nlink)
+ return -ENOENT;
+
+ if (dip->i_entries == (u32)-1)
+ return -EFBIG;
+ if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
+ return -EMLINK;
+
+ return 0;
+}
+
+static void munge_mode_uid_gid(const struct gfs2_inode *dip,
+ struct inode *inode)
+{
+ if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
+ (dip->i_inode.i_mode & S_ISUID) &&
+ !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
+ if (S_ISDIR(inode->i_mode))
+ inode->i_mode |= S_ISUID;
+ else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
+ inode->i_mode &= ~07111;
+ inode->i_uid = dip->i_inode.i_uid;
+ } else
+ inode->i_uid = current_fsuid();
+
+ if (dip->i_inode.i_mode & S_ISGID) {
+ if (S_ISDIR(inode->i_mode))
+ inode->i_mode |= S_ISGID;
+ inode->i_gid = dip->i_inode.i_gid;
+ } else
+ inode->i_gid = current_fsgid();
+}
+
+static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
+{
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+ struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
+ int error;
+
+ error = gfs2_quota_lock_check(ip, &ap);
+ if (error)
+ goto out;
+
+ error = gfs2_inplace_reserve(ip, &ap);
+ if (error)
+ goto out_quota;
+
+ error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
+ if (error)
+ goto out_ipreserv;
+
+ error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
+ ip->i_no_formal_ino = ip->i_generation;
+ ip->i_inode.i_ino = ip->i_no_addr;
+ ip->i_goal = ip->i_no_addr;
+
+ gfs2_trans_end(sdp);
+
+out_ipreserv:
+ gfs2_inplace_release(ip);
+out_quota:
+ gfs2_quota_unlock(ip);
+out:
+ return error;
+}
+
+static void gfs2_init_dir(struct buffer_head *dibh,
+ const struct gfs2_inode *parent)
+{
+ struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
+ struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
+
+ gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
+ dent->de_inum = di->di_num; /* already GFS2 endian */
+ dent->de_type = cpu_to_be16(DT_DIR);
+
+ dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
+ gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
+ gfs2_inum_out(parent, dent);
+ dent->de_type = cpu_to_be16(DT_DIR);
+
+}
+
+/**
+ * gfs2_init_xattr - Initialise an xattr block for a new inode
+ * @ip: The inode in question
+ *
+ * This sets up an empty xattr block for a new inode, ready to
+ * take any ACLs, LSM xattrs, etc.
+ */
+
+static void gfs2_init_xattr(struct gfs2_inode *ip)
+{
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+ struct buffer_head *bh;
+ struct gfs2_ea_header *ea;
+
+ bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
+ gfs2_trans_add_meta(ip->i_gl, bh);
+ gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
+ gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
+
+ ea = GFS2_EA_BH2FIRST(bh);
+ ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
+ ea->ea_type = GFS2_EATYPE_UNUSED;
+ ea->ea_flags = GFS2_EAFLAG_LAST;
+
+ brelse(bh);
+}
+
+/**
+ * init_dinode - Fill in a new dinode structure
+ * @dip: The directory this inode is being created in
+ * @ip: The inode
+ * @symname: The symlink destination (if a symlink)
+ * @bhp: The buffer head (returned to caller)
+ *
+ */
+
+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(MAJOR(ip->i_inode.i_rdev));
+ di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
+ 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_blocks - 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)
+ *
+ * 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, int *opened)
+{
+ const struct qstr *name = &dentry->d_name;
+ struct posix_acl *default_acl, *acl;
+ struct gfs2_holder ghs[2];
+ struct inode *inode = NULL;
+ struct gfs2_inode *dip = GFS2_I(dir), *ip;
+ struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
+ struct gfs2_glock *io_gl;
+ int error, free_vfs_inode = 0;
+ 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_rs_alloc(dip);
+ if (error)
+ return error;
+
+ error = gfs2_rindex_update(sdp);
+ if (error)
+ return error;
+
+ error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
+ if (error)
+ goto fail;
+
+ 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, opened);
+ else
+ error = finish_no_open(file, NULL);
+ }
+ gfs2_glock_dq_uninit(ghs);
+ return error;
+ } else if (error != -ENOENT) {
+ goto fail_gunlock;
+ }
+
+ error = gfs2_diradd_alloc_required(dir, name, &da);
+ if (error < 0)
+ goto fail_gunlock;
+
+ inode = new_inode(sdp->sd_vfs);
+ error = -ENOMEM;
+ if (!inode)
+ goto fail_gunlock;
+
+ error = posix_acl_create(dir, &mode, &default_acl, &acl);
+ if (error)
+ goto fail_free_vfs_inode;
+
+ ip = GFS2_I(inode);
+ error = gfs2_rs_alloc(ip);
+ if (error)
+ goto fail_free_acls;
+
+ inode->i_mode = mode;
+ set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
+ inode->i_rdev = dev;
+ inode->i_size = size;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+ gfs2_set_inode_blocks(inode, 1);
+ 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;
+
+ 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;
+ }
+ 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;
+
+ ip->i_gl->gl_object = ip;
+ error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
+ if (error)
+ goto fail_free_inode;
+
+ error = gfs2_trans_begin(sdp, blocks, 0);
+ if (error)
+ goto fail_gunlock2;
+
+ if (blocks > 1) {
+ ip->i_eattr = ip->i_no_addr + 1;
+ gfs2_init_xattr(ip);
+ }
+ init_dinode(dip, ip, symname);
+ gfs2_trans_end(sdp);
+
+ error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
+ if (error)
+ goto fail_gunlock2;
+
+ error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
+ if (error)
+ goto fail_gunlock2;
+
+ ip->i_iopen_gh.gh_gl->gl_object = ip;
+ gfs2_glock_put(io_gl);
+ gfs2_set_iop(inode);
+ insert_inode_hash(inode);
+
+ if (default_acl) {
+ error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
+ posix_acl_release(default_acl);
+ }
+ if (acl) {
+ if (!error)
+ error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
+ posix_acl_release(acl);
+ }
+
+ if (error)
+ goto fail_gunlock3;
+
+ error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
+ &gfs2_initxattrs, NULL);
+ if (error)
+ goto fail_gunlock3;
+
+ error = link_dinode(dip, name, ip, &da);
+ if (error)
+ goto fail_gunlock3;
+
+ mark_inode_dirty(inode);
+ d_instantiate(dentry, inode);
+ if (file) {
+ *opened |= FILE_CREATED;
+ error = finish_open(file, dentry, gfs2_open_common, opened);
+ }
+ gfs2_glock_dq_uninit(ghs);
+ gfs2_glock_dq_uninit(ghs + 1);
+ return error;
+
+fail_gunlock3:
+ gfs2_glock_dq_uninit(ghs + 1);
+ if (ip->i_gl)
+ gfs2_glock_put(ip->i_gl);
+ goto fail_gunlock;
+
+fail_gunlock2:
+ gfs2_glock_dq_uninit(ghs + 1);
+fail_free_inode:
+ if (ip->i_gl)
+ gfs2_glock_put(ip->i_gl);
+ gfs2_rs_delete(ip, NULL);
+fail_free_acls:
+ if (default_acl)
+ posix_acl_release(default_acl);
+ if (acl)
+ posix_acl_release(acl);
+fail_free_vfs_inode:
+ free_vfs_inode = 1;
+fail_gunlock:
+ gfs2_dir_no_add(&da);
+ gfs2_glock_dq_uninit(ghs);
+ if (inode && !IS_ERR(inode)) {
+ clear_nlink(inode);
+ if (!free_vfs_inode)
+ mark_inode_dirty(inode);
+ set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
+ &GFS2_I(inode)->i_flags);
+ iput(inode);
+ }
+fail:
+ return error;
+}
+
+/**
+ * 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,
+ umode_t mode, bool excl)
+{
+ return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
+}
+
+/**
+ * __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
+ * @opened: atomic_open flags
+ *
+ *
+ * Returns: errno
+ */
+
+static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
+ struct file *file, int *opened)
+{
+ 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, opened);
+
+ 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, NULL);
+}
+
+/**
+ * gfs2_link - Link to a file
+ * @old_dentry: The inode to link
+ * @dir: Add link to this directory
+ * @dentry: The name of the link
+ *
+ * Link the inode in "old_dentry" into the directory "dir" with the
+ * name in "dentry".
+ *
+ * Returns: errno
+ */
+
+static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
+ struct dentry *dentry)
+{
+ struct gfs2_inode *dip = GFS2_I(dir);
+ struct gfs2_sbd *sdp = GFS2_SB(dir);
+ struct inode *inode = d_inode(old_dentry);
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder ghs[2];
+ struct buffer_head *dibh;
+ struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
+ int error;
+
+ if (S_ISDIR(inode->i_mode))
+ return -EPERM;
+
+ error = gfs2_rs_alloc(dip);
+ if (error)
+ return error;
+
+ gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
+ gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
+
+ error = gfs2_glock_nq(ghs); /* parent */
+ if (error)
+ goto out_parent;
+
+ error = gfs2_glock_nq(ghs + 1); /* child */
+ if (error)
+ goto out_child;
+
+ error = -ENOENT;
+ if (inode->i_nlink == 0)
+ goto out_gunlock;
+
+ error = gfs2_permission(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;
+ default:
+ goto out_gunlock;
+ }
+
+ error = -EINVAL;
+ if (!dip->i_inode.i_nlink)
+ goto out_gunlock;
+ error = -EFBIG;
+ if (dip->i_entries == (u32)-1)
+ goto out_gunlock;
+ error = -EPERM;
+ if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
+ goto out_gunlock;
+ error = -EINVAL;
+ if (!ip->i_inode.i_nlink)
+ goto out_gunlock;
+ error = -EMLINK;
+ if (ip->i_inode.i_nlink == (u32)-1)
+ goto out_gunlock;
+
+ error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
+ if (error < 0)
+ goto out_gunlock;
+
+ if (da.nr_blocks) {
+ struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
+ error = gfs2_quota_lock_check(dip, &ap);
+ if (error)
+ goto out_gunlock;
+
+ error = gfs2_inplace_reserve(dip, &ap);
+ if (error)
+ goto out_gunlock_q;
+
+ error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
+ if (error)
+ goto out_ipres;
+ } else {
+ error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
+ if (error)
+ goto out_ipres;
+ }
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto out_end_trans;
+
+ error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
+ if (error)
+ goto out_brelse;
+
+ gfs2_trans_add_meta(ip->i_gl, dibh);
+ inc_nlink(&ip->i_inode);
+ ip->i_inode.i_ctime = CURRENT_TIME;
+ ihold(inode);
+ d_instantiate(dentry, inode);
+ mark_inode_dirty(inode);
+
+out_brelse:
+ brelse(dibh);
+out_end_trans:
+ gfs2_trans_end(sdp);
+out_ipres:
+ if (da.nr_blocks)
+ gfs2_inplace_release(dip);
+out_gunlock_q:
+ if (da.nr_blocks)
+ gfs2_quota_unlock(dip);
+out_gunlock:
+ gfs2_dir_no_add(&da);
+ gfs2_glock_dq(ghs + 1);
+out_child:
+ gfs2_glock_dq(ghs);
+out_parent:
+ gfs2_holder_uninit(ghs);
+ gfs2_holder_uninit(ghs + 1);
+ return error;
+}
+
+/*
+ * gfs2_unlink_ok - check to see that a inode is still in a directory
+ * @dip: the directory
+ * @name: the name of the file
+ * @ip: the inode
+ *
+ * Assumes that the lock on (at least) @dip is held.
+ *
+ * Returns: 0 if the parent/child relationship is correct, errno if it isn't
+ */
+
+static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
+ const struct gfs2_inode *ip)
+{
+ int error;
+
+ if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
+ return -EPERM;
+
+ if ((dip->i_inode.i_mode & S_ISVTX) &&
+ !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
+ !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
+ return -EPERM;
+
+ if (IS_APPEND(&dip->i_inode))
+ return -EPERM;
+
+ error = gfs2_permission(&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
+ * @name: The name of the entry in the parent directory
+ * @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 inode *inode = d_inode(dentry);
+ struct gfs2_inode *ip = GFS2_I(inode);
+ int error;
+
+ error = gfs2_dir_del(dip, dentry);
+ if (error)
+ return error;
+
+ ip->i_entries = 0;
+ inode->i_ctime = CURRENT_TIME;
+ if (S_ISDIR(inode->i_mode))
+ clear_nlink(inode);
+ else
+ drop_nlink(inode);
+ mark_inode_dirty(inode);
+ if (inode->i_nlink == 0)
+ gfs2_unlink_di(inode);
+ return 0;
+}
+
+
+/**
+ * gfs2_unlink - Unlink an inode (this does rmdir as well)
+ * @dir: The inode of the directory containing the inode to unlink
+ * @dentry: The file itself
+ *
+ * This routine uses the type of the inode as a flag to figure out
+ * whether this is an unlink or an rmdir.
+ *
+ * Returns: errno
+ */
+
+static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct gfs2_inode *dip = GFS2_I(dir);
+ struct gfs2_sbd *sdp = GFS2_SB(dir);
+ struct inode *inode = d_inode(dentry);
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder ghs[3];
+ struct gfs2_rgrpd *rgd;
+ int error;
+
+ error = gfs2_rindex_update(sdp);
+ if (error)
+ return error;
+
+ error = -EROFS;
+
+ gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
+ gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
+
+ rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
+ if (!rgd)
+ goto out_inodes;
+
+ gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 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_end_trans;
+
+ error = gfs2_unlink_inode(dip, dentry);
+
+out_end_trans:
+ gfs2_trans_end(sdp);
+out_gunlock:
+ gfs2_glock_dq(ghs + 2);
+out_rgrp:
+ gfs2_glock_dq(ghs + 1);
+out_child:
+ gfs2_glock_dq(ghs);
+out_parent:
+ gfs2_holder_uninit(ghs + 2);
+out_inodes:
+ gfs2_holder_uninit(ghs + 1);
+ gfs2_holder_uninit(ghs);
+ return error;
+}
+
+/**
+ * gfs2_symlink - Create a symlink
+ * @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, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
+}
+
+/**
+ * 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, umode_t mode)
+{
+ struct gfs2_sbd *sdp = GFS2_SB(dir);
+ unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
+ return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
+}
+
+/**
+ * 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, umode_t mode,
+ dev_t dev)
+{
+ return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
+}
+
+/**
+ * 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
+ * @opened: Flag to say whether the file has been opened or not
+ *
+ * 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, int *opened)
+{
+ struct dentry *d;
+ bool excl = !!(flags & O_EXCL);
+
+ if (!d_unhashed(dentry))
+ goto skip_lookup;
+
+ d = __gfs2_lookup(dir, dentry, file, opened);
+ if (IS_ERR(d))
+ return PTR_ERR(d);
+ if (d != NULL)
+ dentry = d;
+ if (d_really_is_positive(dentry)) {
+ if (!(*opened & FILE_OPENED))
+ return finish_no_open(file, d);
+ dput(d);
+ return 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, opened);
+}
+
+/*
+ * 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;
+}
+
+/**
+ * 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[5], r_gh = { .gh_gl = NULL, };
+ 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;
+
+ 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_rs_alloc(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 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, 1);
+ 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);
+ 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(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);
+
+ 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_meta(ip->i_gl, dibh);
+ 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, &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);
+ 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:
+ 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(d_inode(dentry));
+ 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;
+}
+
+/**
+ * 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)
+{
+ 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 (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;
+ unlock = 1;
+ }
+
+ if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
+ error = -EACCES;
+ else
+ error = generic_permission(inode, mask);
+ if (unlock)
+ gfs2_glock_dq_uninit(&i_gh);
+
+ return error;
+}
+
+static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
+{
+ setattr_copy(inode, attr);
+ mark_inode_dirty(inode);
+ return 0;
+}
+
+/**
+ * gfs2_setattr_simple -
+ * @ip:
+ * @attr:
+ *
+ * Returns: errno
+ */
+
+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 = get_write_access(inode);
+ if (error)
+ return error;
+
+ error = gfs2_rs_alloc(ip);
+ if (error)
+ goto out;
+
+ 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, -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:
+ put_write_access(inode);
+ 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 = d_inode(dentry);
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder i_gh;
+ int error;
+
+ error = gfs2_rs_alloc(ip);
+ if (error)
+ return 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 {
+ error = gfs2_setattr_simple(inode, attr);
+ if (!error && attr->ia_valid & ATTR_MODE)
+ error = posix_acl_chmod(inode, inode->i_mode);
+ }
+
+out:
+ if (!error)
+ mark_inode_dirty(inode);
+ gfs2_glock_dq_uninit(&i_gh);
+ 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 = d_inode(dentry);
+ 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 = d_inode(dentry);
+ 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 = gfs2_rs_alloc(ip);
+ 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 = d_inode(dentry);
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder gh;
+ int ret;
+
+ /* For selinux during lookup */
+ if (gfs2_glock_is_locked_by_me(ip->i_gl))
+ return generic_getxattr(dentry, name, data, size);
+
+ 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 = d_inode(dentry);
+ 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 = gfs2_rs_alloc(ip);
+ 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,
+ .get_acl = gfs2_get_acl,
+ .set_acl = gfs2_set_acl,
+};
+
+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,
+ .get_acl = gfs2_get_acl,
+ .set_acl = gfs2_set_acl,
+ .atomic_open = gfs2_atomic_open,
+};
+
+const struct inode_operations gfs2_symlink_iops = {
+ .readlink = generic_readlink,
+ .follow_link = gfs2_follow_link,
+ .put_link = kfree_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,
+};
+
Code Review / kvmfornfv.git / blobdiff