gfs2-y := acl.o bmap.o dir.o xattr.o glock.o \
glops.o log.o lops.o main.o meta_io.o \
aops.o dentry.o export.o file.o \
- ops_fstype.o ops_inode.o quota.o \
+ ops_fstype.o inode.o quota.o \
recovery.o rgrp.o super.o sys.o trans.o util.o
gfs2-$(CONFIG_GFS2_FS_LOCKING_DLM) += lock_dlm.o
--- /dev/null
+/*
+ * 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/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(-ENOBUFS);
+
+ 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_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 == sb->s_root->d_inode)) {
+ 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, 0);
+ if (error)
+ goto out;
+ }
+
+ inode = gfs2_dir_search(dir, name);
+ 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,
+ unsigned int mode)
+{
+ int error;
+
+ error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0);
+ if (error)
+ return error;
+
+ /* Don't create entries in an unlinked directory */
+ if (!dip->i_inode.i_nlink)
+ return -ENOENT;
+
+ error = gfs2_dir_check(&dip->i_inode, name, NULL);
+ switch (error) {
+ case -ENOENT:
+ error = 0;
+ break;
+ case 0:
+ return -EEXIST;
+ default:
+ return error;
+ }
+
+ 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(struct gfs2_inode *dip, unsigned int *mode,
+ unsigned int *uid, unsigned int *gid)
+{
+ if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
+ (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
+ if (S_ISDIR(*mode))
+ *mode |= S_ISUID;
+ else if (dip->i_inode.i_uid != current_fsuid())
+ *mode &= ~07111;
+ *uid = dip->i_inode.i_uid;
+ } else
+ *uid = current_fsuid();
+
+ if (dip->i_inode.i_mode & S_ISGID) {
+ if (S_ISDIR(*mode))
+ *mode |= S_ISGID;
+ *gid = dip->i_inode.i_gid;
+ } else
+ *gid = current_fsgid();
+}
+
+static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
+{
+ struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
+ int error;
+
+ if (gfs2_alloc_get(dip) == NULL)
+ return -ENOMEM;
+
+ dip->i_alloc->al_requested = RES_DINODE;
+ error = gfs2_inplace_reserve(dip);
+ if (error)
+ goto out;
+
+ error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
+ if (error)
+ goto out_ipreserv;
+
+ error = gfs2_alloc_di(dip, no_addr, generation);
+
+ gfs2_trans_end(sdp);
+
+out_ipreserv:
+ gfs2_inplace_release(dip);
+out:
+ gfs2_alloc_put(dip);
+ return error;
+}
+
+/**
+ * init_dinode - Fill in a new dinode structure
+ * @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:
+ *
+ */
+
+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)
+{
+ struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
+ struct gfs2_dinode *di;
+ struct buffer_head *dibh;
+ struct timespec tv = CURRENT_TIME;
+
+ dibh = gfs2_meta_new(gl, inum->no_addr);
+ gfs2_trans_add_bh(gl, dibh, 1);
+ gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
+ gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
+ di = (struct gfs2_dinode *)dibh->b_data;
+
+ di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
+ di->di_num.no_addr = cpu_to_be64(inum->no_addr);
+ di->di_mode = cpu_to_be32(mode);
+ di->di_uid = cpu_to_be32(uid);
+ di->di_gid = cpu_to_be32(gid);
+ di->di_nlink = 0;
+ di->di_size = 0;
+ 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_minor = cpu_to_be32(MINOR(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->__pad2 = 0;
+ di->__pad3 = 0;
+ di->di_depth = 0;
+ di->di_entries = 0;
+ memset(&di->__pad4, 0, sizeof(di->__pad4));
+ di->di_eattr = 0;
+ di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
+ 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));
+
+ 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)
+{
+ struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
+ unsigned int uid, gid;
+ int error;
+
+ munge_mode_uid_gid(dip, &mode, &uid, &gid);
+ if (!gfs2_alloc_get(dip))
+ return -ENOMEM;
+
+ error = gfs2_quota_lock(dip, uid, gid);
+ if (error)
+ goto out;
+
+ error = gfs2_quota_check(dip, uid, gid);
+ if (error)
+ goto out_quota;
+
+ error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
+ if (error)
+ goto out_quota;
+
+ init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, bhp);
+ gfs2_quota_change(dip, +1, uid, gid);
+ gfs2_trans_end(sdp);
+
+out_quota:
+ gfs2_quota_unlock(dip);
+out:
+ gfs2_alloc_put(dip);
+ return error;
+}
+
+static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
+ struct gfs2_inode *ip)
+{
+ struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
+ struct gfs2_alloc *al;
+ int alloc_required;
+ struct buffer_head *dibh;
+ int error;
+
+ al = gfs2_alloc_get(dip);
+ if (!al)
+ return -ENOMEM;
+
+ error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+ if (error)
+ goto fail;
+
+ error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
+ if (alloc_required < 0)
+ goto fail_quota_locks;
+ if (alloc_required) {
+ error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
+ if (error)
+ goto fail_quota_locks;
+
+ al->al_requested = sdp->sd_max_dirres;
+
+ error = gfs2_inplace_reserve(dip);
+ if (error)
+ goto fail_quota_locks;
+
+ error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
+ al->al_rgd->rd_length +
+ 2 * RES_DINODE +
+ RES_STATFS + RES_QUOTA, 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);
+ 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;
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_dinode_out(ip, dibh->b_data);
+ brelse(dibh);
+ return 0;
+
+fail_end_trans:
+ gfs2_trans_end(sdp);
+
+fail_ipreserv:
+ if (dip->i_alloc->al_rgd)
+ gfs2_inplace_release(dip);
+
+fail_quota_locks:
+ gfs2_quota_unlock(dip);
+
+fail:
+ gfs2_alloc_put(dip);
+ return error;
+}
+
+static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
+ const struct qstr *qstr)
+{
+ int err;
+ size_t len;
+ void *value;
+ char *name;
+
+ err = security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
+ &name, &value, &len);
+
+ if (err) {
+ if (err == -EOPNOTSUPP)
+ return 0;
+ return err;
+ }
+
+ err = __gfs2_xattr_set(&ip->i_inode, name, value, len, 0,
+ GFS2_EATYPE_SECURITY);
+ kfree(value);
+ kfree(name);
+
+ return err;
+}
+
+/**
+ * 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
+ *
+ * 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
+ */
+
+struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
+ unsigned int mode, dev_t dev)
+{
+ struct inode *inode = NULL;
+ struct gfs2_inode *dip = ghs->gh_gl->gl_object;
+ struct inode *dir = &dip->i_inode;
+ struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
+ struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
+ int error;
+ u64 generation;
+ struct buffer_head *bh = NULL;
+
+ if (!name->len || name->len > GFS2_FNAMESIZE)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
+ error = gfs2_glock_nq(ghs);
+ if (error)
+ goto fail;
+
+ error = create_ok(dip, name, mode);
+ if (error)
+ goto fail_gunlock;
+
+ error = alloc_dinode(dip, &inum.no_addr, &generation);
+ if (error)
+ goto fail_gunlock;
+ inum.no_formal_ino = generation;
+
+ error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
+ LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
+ if (error)
+ goto fail_gunlock;
+
+ error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, &bh);
+ if (error)
+ goto fail_gunlock2;
+
+ inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
+ inum.no_formal_ino, 0);
+ if (IS_ERR(inode))
+ goto fail_gunlock2;
+
+ error = gfs2_inode_refresh(GFS2_I(inode));
+ if (error)
+ goto fail_gunlock2;
+
+ error = gfs2_acl_create(dip, inode);
+ if (error)
+ goto fail_gunlock2;
+
+ error = gfs2_security_init(dip, GFS2_I(inode), name);
+ if (error)
+ goto fail_gunlock2;
+
+ error = link_dinode(dip, name, GFS2_I(inode));
+ if (error)
+ goto fail_gunlock2;
+
+ if (bh)
+ brelse(bh);
+ return inode;
+
+fail_gunlock2:
+ gfs2_glock_dq_uninit(ghs + 1);
+ if (inode && !IS_ERR(inode))
+ iput(inode);
+fail_gunlock:
+ gfs2_glock_dq(ghs);
+fail:
+ if (bh)
+ brelse(bh);
+ return ERR_PTR(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,
+ 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, 0);
+ 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 && nd->flags & LOOKUP_EXCL)) {
+ gfs2_holder_uninit(ghs);
+ return PTR_ERR(inode);
+ }
+
+ inode = gfs2_lookupi(dir, &dentry->d_name, 0);
+ 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;
+
+ 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)
+ goto out_end_trans;
+
+ error = gfs2_dir_add(dir, &dentry->d_name, ip);
+ if (error)
+ goto out_brelse;
+
+ 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);
+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_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) &&
+ 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_dir_check(&dip->i_inode, name, ip);
+ if (error)
+ return error;
+
+ 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_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, 0);
+ if (IS_ERR(inode)) {
+ gfs2_holder_uninit(ghs);
+ return PTR_ERR(inode);
+ }
+
+ ip = ghs[1].gh_gl->gl_object;
+
+ i_size_write(inode, size);
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+
+ if (!gfs2_assert_withdraw(sdp, !error)) {
+ gfs2_dinode_out(ip, 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, 0);
+ if (IS_ERR(inode)) {
+ gfs2_holder_uninit(ghs);
+ return PTR_ERR(inode);
+ }
+
+ ip = ghs[1].gh_gl->gl_object;
+
+ ip->i_inode.i_nlink = 2;
+ i_size_write(inode, sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
+ ip->i_diskflags |= GFS2_DIF_JDATA;
+ ip->i_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);
+
+ gfs2_trans_add_bh(ip->i_gl, dibh, 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);
+ di->di_entries = cpu_to_be32(1);
+
+ 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(dip, dent);
+ dent->de_type = cpu_to_be16(DT_DIR);
+
+ gfs2_dinode_out(ip, di);
+
+ 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_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);
+ struct gfs2_sbd *sdp = GFS2_SB(dir);
+ struct gfs2_holder ghs[2];
+ struct inode *inode;
+
+ gfs2_holder_init(dip->i_gl, 0, 0, ghs);
+
+ inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
+ if (IS_ERR(inode)) {
+ gfs2_holder_uninit(ghs);
+ return PTR_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);
+
+ d_instantiate(dentry, inode);
+ mark_inode_dirty(inode);
+
+ return 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 x, 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;
+ }
+
+ x = size + 1;
+ buf = kmalloc(x, GFP_NOFS);
+ if (!buf)
+ buf = ERR_PTR(-ENOMEM);
+ else
+ memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
+ 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,
+};
+
+++ /dev/null
-/*
- * 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/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(-ENOBUFS);
-
- 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_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 == sb->s_root->d_inode)) {
- 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, 0);
- if (error)
- goto out;
- }
-
- inode = gfs2_dir_search(dir, name);
- 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,
- unsigned int mode)
-{
- int error;
-
- error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0);
- if (error)
- return error;
-
- /* Don't create entries in an unlinked directory */
- if (!dip->i_inode.i_nlink)
- return -ENOENT;
-
- error = gfs2_dir_check(&dip->i_inode, name, NULL);
- switch (error) {
- case -ENOENT:
- error = 0;
- break;
- case 0:
- return -EEXIST;
- default:
- return error;
- }
-
- 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(struct gfs2_inode *dip, unsigned int *mode,
- unsigned int *uid, unsigned int *gid)
-{
- if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
- (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
- if (S_ISDIR(*mode))
- *mode |= S_ISUID;
- else if (dip->i_inode.i_uid != current_fsuid())
- *mode &= ~07111;
- *uid = dip->i_inode.i_uid;
- } else
- *uid = current_fsuid();
-
- if (dip->i_inode.i_mode & S_ISGID) {
- if (S_ISDIR(*mode))
- *mode |= S_ISGID;
- *gid = dip->i_inode.i_gid;
- } else
- *gid = current_fsgid();
-}
-
-static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
-{
- struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
- int error;
-
- if (gfs2_alloc_get(dip) == NULL)
- return -ENOMEM;
-
- dip->i_alloc->al_requested = RES_DINODE;
- error = gfs2_inplace_reserve(dip);
- if (error)
- goto out;
-
- error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
- if (error)
- goto out_ipreserv;
-
- error = gfs2_alloc_di(dip, no_addr, generation);
-
- gfs2_trans_end(sdp);
-
-out_ipreserv:
- gfs2_inplace_release(dip);
-out:
- gfs2_alloc_put(dip);
- return error;
-}
-
-/**
- * init_dinode - Fill in a new dinode structure
- * @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:
- *
- */
-
-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)
-{
- struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
- struct gfs2_dinode *di;
- struct buffer_head *dibh;
- struct timespec tv = CURRENT_TIME;
-
- dibh = gfs2_meta_new(gl, inum->no_addr);
- gfs2_trans_add_bh(gl, dibh, 1);
- gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
- gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
- di = (struct gfs2_dinode *)dibh->b_data;
-
- di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
- di->di_num.no_addr = cpu_to_be64(inum->no_addr);
- di->di_mode = cpu_to_be32(mode);
- di->di_uid = cpu_to_be32(uid);
- di->di_gid = cpu_to_be32(gid);
- di->di_nlink = 0;
- di->di_size = 0;
- 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_minor = cpu_to_be32(MINOR(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->__pad2 = 0;
- di->__pad3 = 0;
- di->di_depth = 0;
- di->di_entries = 0;
- memset(&di->__pad4, 0, sizeof(di->__pad4));
- di->di_eattr = 0;
- di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
- 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));
-
- 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)
-{
- struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
- unsigned int uid, gid;
- int error;
-
- munge_mode_uid_gid(dip, &mode, &uid, &gid);
- if (!gfs2_alloc_get(dip))
- return -ENOMEM;
-
- error = gfs2_quota_lock(dip, uid, gid);
- if (error)
- goto out;
-
- error = gfs2_quota_check(dip, uid, gid);
- if (error)
- goto out_quota;
-
- error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
- if (error)
- goto out_quota;
-
- init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, bhp);
- gfs2_quota_change(dip, +1, uid, gid);
- gfs2_trans_end(sdp);
-
-out_quota:
- gfs2_quota_unlock(dip);
-out:
- gfs2_alloc_put(dip);
- return error;
-}
-
-static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
- struct gfs2_inode *ip)
-{
- struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
- struct gfs2_alloc *al;
- int alloc_required;
- struct buffer_head *dibh;
- int error;
-
- al = gfs2_alloc_get(dip);
- if (!al)
- return -ENOMEM;
-
- error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
- if (error)
- goto fail;
-
- error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
- if (alloc_required < 0)
- goto fail_quota_locks;
- if (alloc_required) {
- error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
- if (error)
- goto fail_quota_locks;
-
- al->al_requested = sdp->sd_max_dirres;
-
- error = gfs2_inplace_reserve(dip);
- if (error)
- goto fail_quota_locks;
-
- error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
- al->al_rgd->rd_length +
- 2 * RES_DINODE +
- RES_STATFS + RES_QUOTA, 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);
- 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;
- gfs2_trans_add_bh(ip->i_gl, dibh, 1);
- gfs2_dinode_out(ip, dibh->b_data);
- brelse(dibh);
- return 0;
-
-fail_end_trans:
- gfs2_trans_end(sdp);
-
-fail_ipreserv:
- if (dip->i_alloc->al_rgd)
- gfs2_inplace_release(dip);
-
-fail_quota_locks:
- gfs2_quota_unlock(dip);
-
-fail:
- gfs2_alloc_put(dip);
- return error;
-}
-
-static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
- const struct qstr *qstr)
-{
- int err;
- size_t len;
- void *value;
- char *name;
-
- err = security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
- &name, &value, &len);
-
- if (err) {
- if (err == -EOPNOTSUPP)
- return 0;
- return err;
- }
-
- err = __gfs2_xattr_set(&ip->i_inode, name, value, len, 0,
- GFS2_EATYPE_SECURITY);
- kfree(value);
- kfree(name);
-
- return err;
-}
-
-/**
- * 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
- *
- * 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
- */
-
-struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
- unsigned int mode, dev_t dev)
-{
- struct inode *inode = NULL;
- struct gfs2_inode *dip = ghs->gh_gl->gl_object;
- struct inode *dir = &dip->i_inode;
- struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
- struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
- int error;
- u64 generation;
- struct buffer_head *bh = NULL;
-
- if (!name->len || name->len > GFS2_FNAMESIZE)
- return ERR_PTR(-ENAMETOOLONG);
-
- gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
- error = gfs2_glock_nq(ghs);
- if (error)
- goto fail;
-
- error = create_ok(dip, name, mode);
- if (error)
- goto fail_gunlock;
-
- error = alloc_dinode(dip, &inum.no_addr, &generation);
- if (error)
- goto fail_gunlock;
- inum.no_formal_ino = generation;
-
- error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
- LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
- if (error)
- goto fail_gunlock;
-
- error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, &bh);
- if (error)
- goto fail_gunlock2;
-
- inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
- inum.no_formal_ino, 0);
- if (IS_ERR(inode))
- goto fail_gunlock2;
-
- error = gfs2_inode_refresh(GFS2_I(inode));
- if (error)
- goto fail_gunlock2;
-
- error = gfs2_acl_create(dip, inode);
- if (error)
- goto fail_gunlock2;
-
- error = gfs2_security_init(dip, GFS2_I(inode), name);
- if (error)
- goto fail_gunlock2;
-
- error = link_dinode(dip, name, GFS2_I(inode));
- if (error)
- goto fail_gunlock2;
-
- if (bh)
- brelse(bh);
- return inode;
-
-fail_gunlock2:
- gfs2_glock_dq_uninit(ghs + 1);
- if (inode && !IS_ERR(inode))
- iput(inode);
-fail_gunlock:
- gfs2_glock_dq(ghs);
-fail:
- if (bh)
- brelse(bh);
- return ERR_PTR(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,
- 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, 0);
- 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 && nd->flags & LOOKUP_EXCL)) {
- gfs2_holder_uninit(ghs);
- return PTR_ERR(inode);
- }
-
- inode = gfs2_lookupi(dir, &dentry->d_name, 0);
- 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;
-
- 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)
- goto out_end_trans;
-
- error = gfs2_dir_add(dir, &dentry->d_name, ip);
- if (error)
- goto out_brelse;
-
- 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);
-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_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) &&
- 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_dir_check(&dip->i_inode, name, ip);
- if (error)
- return error;
-
- 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_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, 0);
- if (IS_ERR(inode)) {
- gfs2_holder_uninit(ghs);
- return PTR_ERR(inode);
- }
-
- ip = ghs[1].gh_gl->gl_object;
-
- i_size_write(inode, size);
-
- error = gfs2_meta_inode_buffer(ip, &dibh);
-
- if (!gfs2_assert_withdraw(sdp, !error)) {
- gfs2_dinode_out(ip, 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, 0);
- if (IS_ERR(inode)) {
- gfs2_holder_uninit(ghs);
- return PTR_ERR(inode);
- }
-
- ip = ghs[1].gh_gl->gl_object;
-
- ip->i_inode.i_nlink = 2;
- i_size_write(inode, sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
- ip->i_diskflags |= GFS2_DIF_JDATA;
- ip->i_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);
-
- gfs2_trans_add_bh(ip->i_gl, dibh, 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);
- di->di_entries = cpu_to_be32(1);
-
- 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(dip, dent);
- dent->de_type = cpu_to_be16(DT_DIR);
-
- gfs2_dinode_out(ip, di);
-
- 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_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);
- struct gfs2_sbd *sdp = GFS2_SB(dir);
- struct gfs2_holder ghs[2];
- struct inode *inode;
-
- gfs2_holder_init(dip->i_gl, 0, 0, ghs);
-
- inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
- if (IS_ERR(inode)) {
- gfs2_holder_uninit(ghs);
- return PTR_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);
-
- d_instantiate(dentry, inode);
- mark_inode_dirty(inode);
-
- return 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 x, 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;
- }
-
- x = size + 1;
- buf = kmalloc(x, GFP_NOFS);
- if (!buf)
- buf = ERR_PTR(-ENOMEM);
- else
- memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
- 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 / GitHub / mt8127 / android_kernel_alcatel_ttab.git / commitdiff