[PATCH 03/16] GFS2:
The GFS2 block mapping and inode core code.
Signed-off-by: Steven Whitehouse <[email protected]>
Signed-off-by: David Teigland <[email protected]>
fs/gfs2/bmap.c | 1089 ++++++++++++++++++++++++++++++++
fs/gfs2/bmap.h | 35 +
fs/gfs2/format.h | 21
fs/gfs2/glops.c | 487 ++++++++++++++
fs/gfs2/glops.h | 23
fs/gfs2/inode.c | 1835 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/gfs2/inode.h | 81 ++
7 files changed, 3571 insertions(+)
--- /dev/null
+++ b/fs/gfs2/bmap.c
@@ -0,0 +1,1089 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2005 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 v.2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <asm/semaphore.h>
+
+#include "gfs2.h"
+#include "bmap.h"
+#include "glock.h"
+#include "inode.h"
+#include "meta_io.h"
+#include "page.h"
+#include "quota.h"
+#include "rgrp.h"
+#include "trans.h"
+#include "dir.h"
+
+/* This doesn't need to be that large as max 64 bit pointers in a 4k
+ * block is 512, so __u16 is fine for that. It saves stack space to
+ * keep it small.
+ */
+struct metapath {
+ __u16 mp_list[GFS2_MAX_META_HEIGHT];
+};
+
+typedef int (*block_call_t) (struct gfs2_inode *ip, struct buffer_head *dibh,
+ struct buffer_head *bh, uint64_t *top,
+ uint64_t *bottom, unsigned int height,
+ void *data);
+
+struct strip_mine {
+ int sm_first;
+ unsigned int sm_height;
+};
+
+/**
+ * @gfs2_unstuffer_sync - Synchronously unstuff a dinode
+ * @ip:
+ * @dibh:
+ * @block:
+ * @private:
+ *
+ * Cheat and use a metadata buffer instead of a data page.
+ *
+ * Returns: errno
+ */
+
+int gfs2_unstuffer_sync(struct gfs2_inode *ip, struct buffer_head *dibh,
+ uint64_t block, void *private)
+{
+ struct buffer_head *bh;
+ int error;
+
+ bh = gfs2_meta_new(ip->i_gl, block);
+
+ gfs2_buffer_copy_tail(bh, 0, dibh, sizeof(struct gfs2_dinode));
+
+ set_buffer_dirty(bh);
+ error = sync_dirty_buffer(bh);
+
+ brelse(bh);
+
+ return error;
+}
+
+/**
+ * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big
+ * @ip: The GFS2 inode to unstuff
+ * @unstuffer: the routine that handles unstuffing a non-zero length file
+ * @private: private data for the unstuffer
+ *
+ * This routine unstuffs a dinode and returns it to a "normal" state such
+ * that the height can be grown in the traditional way.
+ *
+ * Returns: errno
+ */
+
+int gfs2_unstuff_dinode(struct gfs2_inode *ip, gfs2_unstuffer_t unstuffer,
+ void *private)
+{
+ struct buffer_head *bh, *dibh;
+ uint64_t block = 0;
+ int isdir = gfs2_is_dir(ip);
+ int error;
+
+ down_write(&ip->i_rw_mutex);
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto out;
+
+ if (ip->i_di.di_size) {
+ /* Get a free block, fill it with the stuffed data,
+ and write it out to disk */
+
+ if (isdir) {
+ block = gfs2_alloc_meta(ip);
+
+ error = gfs2_dir_get_buffer(ip, block, 1, &bh);
+ if (error)
+ goto out_brelse;
+ gfs2_buffer_copy_tail(bh,
+ sizeof(struct gfs2_meta_header),
+ dibh, sizeof(struct gfs2_dinode));
+ brelse(bh);
+ } else {
+ block = gfs2_alloc_data(ip);
+
+ error = unstuffer(ip, dibh, block, private);
+ if (error)
+ goto out_brelse;
+ }
+ }
+
+ /* Set up the pointer to the new block */
+
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+
+ gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
+
+ if (ip->i_di.di_size) {
+ *(uint64_t *)(dibh->b_data + sizeof(struct gfs2_dinode)) = cpu_to_be64(block);
+ ip->i_di.di_blocks++;
+ }
+
+ ip->i_di.di_height = 1;
+
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+
+ out_brelse:
+ brelse(dibh);
+
+ out:
+ up_write(&ip->i_rw_mutex);
+
+ return error;
+}
+
+/**
+ * calc_tree_height - Calculate the height of a metadata tree
+ * @ip: The GFS2 inode
+ * @size: The proposed size of the file
+ *
+ * Work out how tall a metadata tree needs to be in order to accommodate a
+ * file of a particular size. If size is less than the current size of
+ * the inode, then the current size of the inode is used instead of the
+ * supplied one.
+ *
+ * Returns: the height the tree should be
+ */
+
+static unsigned int calc_tree_height(struct gfs2_inode *ip, uint64_t size)
+{
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ uint64_t *arr;
+ unsigned int max, height;
+
+ if (ip->i_di.di_size > size)
+ size = ip->i_di.di_size;
+
+ if (gfs2_is_dir(ip)) {
+ arr = sdp->sd_jheightsize;
+ max = sdp->sd_max_jheight;
+ } else {
+ arr = sdp->sd_heightsize;
+ max = sdp->sd_max_height;
+ }
+
+ for (height = 0; height < max; height++)
+ if (arr[height] >= size)
+ break;
+
+ return height;
+}
+
+/**
+ * build_height - Build a metadata tree of the requested height
+ * @ip: The GFS2 inode
+ * @height: The height to build to
+ *
+ * This routine makes sure that the metadata tree is tall enough to hold
+ * "size" bytes of data.
+ *
+ * Returns: errno
+ */
+
+static int build_height(struct gfs2_inode *ip, int height)
+{
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ struct buffer_head *bh, *dibh;
+ uint64_t block = 0, *bp;
+ unsigned int x;
+ int new_block;
+ int error;
+
+ while (ip->i_di.di_height < height) {
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ return error;
+
+ new_block = 0;
+ bp = (uint64_t *)(dibh->b_data + sizeof(struct gfs2_dinode));
+ for (x = 0; x < sdp->sd_diptrs; x++, bp++)
+ if (*bp) {
+ new_block = 1;
+ break;
+ }
+
+ if (new_block) {
+ /* Get a new block, fill it with the old direct
+ pointers, and write it out */
+
+ block = gfs2_alloc_meta(ip);
+
+ bh = gfs2_meta_new(ip->i_gl, block);
+ gfs2_trans_add_bh(ip->i_gl, bh, 1);
+ gfs2_metatype_set(bh,
+ GFS2_METATYPE_IN,
+ GFS2_FORMAT_IN);
+ gfs2_buffer_copy_tail(bh,
+ sizeof(struct gfs2_meta_header),
+ dibh, sizeof(struct gfs2_dinode));
+
+ brelse(bh);
+ }
+
+ /* Set up the new direct pointer and write it out to disk */
+
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+
+ gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
+
+ if (new_block) {
+ *(uint64_t *)(dibh->b_data + sizeof(struct gfs2_dinode)) = cpu_to_be64(block);
+ ip->i_di.di_blocks++;
+ }
+
+ ip->i_di.di_height++;
+
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
+ }
+
+ return 0;
+}
+
+/**
+ * find_metapath - Find path through the metadata tree
+ * @ip: The inode pointer
+ * @mp: The metapath to return the result in
+ * @block: The disk block to look up
+ *
+ * This routine returns a struct metapath structure that defines a path
+ * through the metadata of inode "ip" to get to block "block".
+ *
+ * Example:
+ * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a
+ * filesystem with a blocksize of 4096.
+ *
+ * find_metapath() would return a struct metapath structure set to:
+ * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48,
+ * and mp_list[2] = 165.
+ *
+ * That means that in order to get to the block containing the byte at
+ * offset 101342453, we would load the indirect block pointed to by pointer
+ * 0 in the dinode. We would then load the indirect block pointed to by
+ * pointer 48 in that indirect block. We would then load the data block
+ * pointed to by pointer 165 in that indirect block.
+ *
+ * ----------------------------------------
+ * | Dinode | |
+ * | | 4|
+ * | |0 1 2 3 4 5 9|
+ * | | 6|
+ * ----------------------------------------
+ * |
+ * |
+ * V
+ * ----------------------------------------
+ * | Indirect Block |
+ * | 5|
+ * | 4 4 4 4 4 5 5 1|
+ * |0 5 6 7 8 9 0 1 2|
+ * ----------------------------------------
+ * |
+ * |
+ * V
+ * ----------------------------------------
+ * | Indirect Block |
+ * | 1 1 1 1 1 5|
+ * | 6 6 6 6 6 1|
+ * |0 3 4 5 6 7 2|
+ * ----------------------------------------
+ * |
+ * |
+ * V
+ * ----------------------------------------
+ * | Data block containing offset |
+ * | 101342453 |
+ * | |
+ * | |
+ * ----------------------------------------
+ *
+ */
+
+static void find_metapath(struct gfs2_inode *ip, uint64_t block, struct metapath *mp)
+{
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ uint64_t b = block;
+ unsigned int i;
+
+ for (i = ip->i_di.di_height; i--;)
+ mp->mp_list[i] = (__u16)do_div(b, sdp->sd_inptrs);
+
+}
+
+/**
+ * metapointer - Return pointer to start of metadata in a buffer
+ * @bh: The buffer
+ * @height: The metadata height (0 = dinode)
+ * @mp: The metapath
+ *
+ * Return a pointer to the block number of the next height of the metadata
+ * tree given a buffer containing the pointer to the current height of the
+ * metadata tree.
+ */
+
+static inline uint64_t *metapointer(struct buffer_head *bh,
+ unsigned int height, struct metapath *mp)
+{
+ unsigned int head_size = (height > 0) ?
+ sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode);
+
+ return ((uint64_t *)(bh->b_data + head_size)) + mp->mp_list[height];
+}
+
+/**
+ * lookup_block - Get the next metadata block in metadata tree
+ * @ip: The GFS2 inode
+ * @bh: Buffer containing the pointers to metadata blocks
+ * @height: The height of the tree (0 = dinode)
+ * @mp: The metapath
+ * @create: Non-zero if we may create a new meatdata block
+ * @new: Used to indicate if we did create a new metadata block
+ * @block: the returned disk block number
+ *
+ * Given a metatree, complete to a particular height, checks to see if the next
+ * height of the tree exists. If not the next height of the tree is created.
+ * The block number of the next height of the metadata tree is returned.
+ *
+ */
+
+static void lookup_block(struct gfs2_inode *ip, struct buffer_head *bh,
+ unsigned int height, struct metapath *mp, int create,
+ int *new, uint64_t *block)
+{
+ uint64_t *ptr = metapointer(bh, height, mp);
+
+ if (*ptr) {
+ *block = be64_to_cpu(*ptr);
+ return;
+ }
+
+ *block = 0;
+
+ if (!create)
+ return;
+
+ if (height == ip->i_di.di_height - 1 &&
+ !gfs2_is_dir(ip))
+ *block = gfs2_alloc_data(ip);
+ else
+ *block = gfs2_alloc_meta(ip);
+
+ gfs2_trans_add_bh(ip->i_gl, bh, 1);
+
+ *ptr = cpu_to_be64(*block);
+ ip->i_di.di_blocks++;
+
+ *new = 1;
+}
+
+/**
+ * gfs2_block_map - Map a block from an inode to a disk block
+ * @ip: The GFS2 inode
+ * @lblock: The logical block number
+ * @new: Value/Result argument (1 = may create/did create new blocks)
+ * @dblock: the disk block number of the start of an extent
+ * @extlen: the size of the extent
+ *
+ * Find the block number on the current device which corresponds to an
+ * inode's block. If the block had to be created, "new" will be set.
+ *
+ * Returns: errno
+ */
+
+int gfs2_block_map(struct gfs2_inode *ip, uint64_t lblock, int *new,
+ uint64_t *dblock, uint32_t *extlen)
+{
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ struct buffer_head *bh;
+ struct metapath mp;
+ int create = *new;
+ unsigned int bsize;
+ unsigned int height;
+ unsigned int end_of_metadata;
+ unsigned int x;
+ int error = 0;
+
+ *new = 0;
+ *dblock = 0;
+ if (extlen)
+ *extlen = 0;
+
+ if (create)
+ down_write(&ip->i_rw_mutex);
+ else
+ down_read(&ip->i_rw_mutex);
+
+ if (gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip)))
+ goto out;
+
+ bsize = (gfs2_is_dir(ip)) ? sdp->sd_jbsize : sdp->sd_sb.sb_bsize;
+
+ height = calc_tree_height(ip, (lblock + 1) * bsize);
+ if (ip->i_di.di_height < height) {
+ if (!create)
+ goto out;
+
+ error = build_height(ip, height);
+ if (error)
+ goto out;
+ }
+
+ find_metapath(ip, lblock, &mp);
+ end_of_metadata = ip->i_di.di_height - 1;
+
+ error = gfs2_meta_inode_buffer(ip, &bh);
+ if (error)
+ goto out;
+
+ for (x = 0; x < end_of_metadata; x++) {
+ lookup_block(ip, bh, x, &mp, create, new, dblock);
+ brelse(bh);
+ if (!*dblock)
+ goto out;
+
+ error = gfs2_meta_indirect_buffer(ip, x+1, *dblock, *new, &bh);
+ if (error)
+ goto out;
+ }
+
+ lookup_block(ip, bh, end_of_metadata, &mp, create, new, dblock);
+
+ if (extlen && *dblock) {
+ *extlen = 1;
+
+ if (!*new) {
+ uint64_t tmp_dblock;
+ int tmp_new;
+ unsigned int nptrs;
+
+ nptrs = (end_of_metadata) ? sdp->sd_inptrs :
+ sdp->sd_diptrs;
+
+ while (++mp.mp_list[end_of_metadata] < nptrs) {
+ lookup_block(ip, bh, end_of_metadata, &mp,
+ 0, &tmp_new, &tmp_dblock);
+
+ if (*dblock + *extlen != tmp_dblock)
+ break;
+
+ (*extlen)++;
+ }
+ }
+ }
+
+ brelse(bh);
+
+ if (*new) {
+ error = gfs2_meta_inode_buffer(ip, &bh);
+ if (!error) {
+ gfs2_trans_add_bh(ip->i_gl, bh, 1);
+ gfs2_dinode_out(&ip->i_di, bh->b_data);
+ brelse(bh);
+ }
+ }
+
+ out:
+ if (create)
+ up_write(&ip->i_rw_mutex);
+ else
+ up_read(&ip->i_rw_mutex);
+
+ return error;
+}
+
+/**
+ * recursive_scan - recursively scan through the end of a file
+ * @ip: the inode
+ * @dibh: the dinode buffer
+ * @mp: the path through the metadata to the point to start
+ * @height: the height the recursion is at
+ * @block: the indirect block to look at
+ * @first: 1 if this is the first block
+ * @bc: the call to make for each piece of metadata
+ * @data: data opaque to this function to pass to @bc
+ *
+ * When this is first called @height and @block should be zero and
+ * @first should be 1.
+ *
+ * Returns: errno
+ */
+
+static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh,
+ struct metapath *mp, unsigned int height,
+ uint64_t block, int first, block_call_t bc,
+ void *data)
+{
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ struct buffer_head *bh = NULL;
+ uint64_t *top, *bottom;
+ uint64_t bn;
+ int error;
+ int mh_size = sizeof(struct gfs2_meta_header);
+
+ if (!height) {
+ error = gfs2_meta_inode_buffer(ip, &bh);
+ if (error)
+ return error;
+ dibh = bh;
+
+ top = (uint64_t *)(bh->b_data + sizeof(struct gfs2_dinode)) +
+ mp->mp_list[0];
+ bottom = (uint64_t *)(bh->b_data + sizeof(struct gfs2_dinode)) +
+ sdp->sd_diptrs;
+ } else {
+ error = gfs2_meta_indirect_buffer(ip, height, block, 0, &bh);
+ if (error)
+ return error;
+
+ top = (uint64_t *)(bh->b_data + mh_size) +
+ ((first) ? mp->mp_list[height] : 0);
+
+ bottom = (uint64_t *)(bh->b_data + mh_size) + sdp->sd_inptrs;
+ }
+
+ error = bc(ip, dibh, bh, top, bottom, height, data);
+ if (error)
+ goto out;
+
+ if (height < ip->i_di.di_height - 1)
+ for (; top < bottom; top++, first = 0) {
+ if (!*top)
+ continue;
+
+ bn = be64_to_cpu(*top);
+
+ error = recursive_scan(ip, dibh, mp, height + 1, bn,
+ first, bc, data);
+ if (error)
+ break;
+ }
+
+ out:
+ brelse(bh);
+
+ return error;
+}
+
+/**
+ * do_strip - Look for a layer a particular layer of the file and strip it off
+ * @ip: the inode
+ * @dibh: the dinode buffer
+ * @bh: A buffer of pointers
+ * @top: The first pointer in the buffer
+ * @bottom: One more than the last pointer
+ * @height: the height this buffer is at
+ * @data: a pointer to a struct strip_mine
+ *
+ * Returns: errno
+ */
+
+static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
+ struct buffer_head *bh, uint64_t *top, uint64_t *bottom,
+ unsigned int height, void *data)
+{
+ struct strip_mine *sm = (struct strip_mine *)data;
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ struct gfs2_rgrp_list rlist;
+ uint64_t bn, bstart;
+ uint32_t blen;
+ uint64_t *p;
+ unsigned int rg_blocks = 0;
+ int metadata;
+ unsigned int revokes = 0;
+ int x;
+ int error;
+
+ if (!*top)
+ sm->sm_first = 0;
+
+ if (height != sm->sm_height)
+ return 0;
+
+ if (sm->sm_first) {
+ top++;
+ sm->sm_first = 0;
+ }
+
+ metadata = (height != ip->i_di.di_height - 1);
+ if (metadata)
+ revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs;
+
+ error = gfs2_rindex_hold(sdp, &ip->i_alloc.al_ri_gh);
+ if (error)
+ return error;
+
+ memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
+ bstart = 0;
+ blen = 0;
+
+ for (p = top; p < bottom; p++) {
+ if (!*p)
+ continue;
+
+ bn = be64_to_cpu(*p);
+
+ if (bstart + blen == bn)
+ blen++;
+ else {
+ if (bstart)
+ gfs2_rlist_add(sdp, &rlist, bstart);
+
+ bstart = bn;
+ blen = 1;
+ }
+ }
+
+ if (bstart)
+ gfs2_rlist_add(sdp, &rlist, bstart);
+ else
+ goto out; /* Nothing to do */
+
+ gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0);
+
+ for (x = 0; x < rlist.rl_rgrps; x++) {
+ struct gfs2_rgrpd *rgd;
+ rgd = get_gl2rgd(rlist.rl_ghs[x].gh_gl);
+ rg_blocks += rgd->rd_ri.ri_length;
+ }
+
+ error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
+ if (error)
+ goto out_rlist;
+
+ error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE +
+ RES_INDIRECT + RES_STATFS + RES_QUOTA,
+ revokes);
+ if (error)
+ goto out_rg_gunlock;
+
+ down_write(&ip->i_rw_mutex);
+
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_trans_add_bh(ip->i_gl, bh, 1);
+
+ bstart = 0;
+ blen = 0;
+
+ for (p = top; p < bottom; p++) {
+ if (!*p)
+ continue;
+
+ bn = be64_to_cpu(*p);
+
+ if (bstart + blen == bn)
+ blen++;
+ else {
+ if (bstart) {
+ if (metadata)
+ gfs2_free_meta(ip, bstart, blen);
+ else
+ gfs2_free_data(ip, bstart, blen);
+ }
+
+ bstart = bn;
+ blen = 1;
+ }
+
+ *p = 0;
+ if (!ip->i_di.di_blocks)
+ gfs2_consist_inode(ip);
+ ip->i_di.di_blocks--;
+ }
+ if (bstart) {
+ if (metadata)
+ gfs2_free_meta(ip, bstart, blen);
+ else
+ gfs2_free_data(ip, bstart, blen);
+ }
+
+ ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
+
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+
+ up_write(&ip->i_rw_mutex);
+
+ gfs2_trans_end(sdp);
+
+ out_rg_gunlock:
+ gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
+
+ out_rlist:
+ gfs2_rlist_free(&rlist);
+
+ out:
+ gfs2_glock_dq_uninit(&ip->i_alloc.al_ri_gh);
+
+ return error;
+}
+
+/**
+ * do_grow - Make a file look bigger than it is
+ * @ip: the inode
+ * @size: the size to set the file to
+ *
+ * Called with an exclusive lock on @ip.
+ *
+ * Returns: errno
+ */
+
+static int do_grow(struct gfs2_inode *ip, uint64_t size)
+{
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ struct gfs2_alloc *al;
+ struct buffer_head *dibh;
+ unsigned int h;
+ int error;
+
+ al = gfs2_alloc_get(ip);
+
+ error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+ if (error)
+ goto out;
+
+ error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid);
+ if (error)
+ goto out_gunlock_q;
+
+ al->al_requested = sdp->sd_max_height + RES_DATA;
+
+ error = gfs2_inplace_reserve(ip);
+ if (error)
+ goto out_gunlock_q;
+
+ error = gfs2_trans_begin(sdp,
+ sdp->sd_max_height + al->al_rgd->rd_ri.ri_length +
+ RES_JDATA + RES_DINODE + RES_STATFS + RES_QUOTA, 0);
+ if (error)
+ goto out_ipres;
+
+ if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
+ if (gfs2_is_stuffed(ip)) {
+ error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page,
+ NULL);
+ if (error)
+ goto out_end_trans;
+ }
+
+ h = calc_tree_height(ip, size);
+ if (ip->i_di.di_height < h) {
+ down_write(&ip->i_rw_mutex);
+ error = build_height(ip, h);
+ up_write(&ip->i_rw_mutex);
+ if (error)
+ goto out_end_trans;
+ }
+ }
+
+ ip->i_di.di_size = size;
+ ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto out_end_trans;
+
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
+
+ out_end_trans:
+ gfs2_trans_end(sdp);
+
+ out_ipres:
+ gfs2_inplace_release(ip);
+
+ out_gunlock_q:
+ gfs2_quota_unlock(ip);
+
+ out:
+ gfs2_alloc_put(ip);
+
+ return error;
+}
+
+static int trunc_start(struct gfs2_inode *ip, uint64_t size)
+{
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ struct buffer_head *dibh;
+ int journaled = gfs2_is_jdata(ip);
+ int error;
+
+ error = gfs2_trans_begin(sdp,
+ RES_DINODE + ((journaled) ? RES_JDATA : 0), 0);
+ if (error)
+ return error;
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto out;
+
+ if (gfs2_is_stuffed(ip)) {
+ ip->i_di.di_size = size;
+ ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + size);
+ error = 1;
+
+ } else {
+ if (size & (uint64_t)(sdp->sd_sb.sb_bsize - 1))
+ error = gfs2_block_truncate_page(ip->i_vnode->i_mapping);
+
+ if (!error) {
+ ip->i_di.di_size = size;
+ ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
+ ip->i_di.di_flags |= GFS2_DIF_TRUNC_IN_PROG;
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ }
+ }
+
+ brelse(dibh);
+
+ out:
+ gfs2_trans_end(sdp);
+
+ return error;
+}
+
+static int trunc_dealloc(struct gfs2_inode *ip, uint64_t size)
+{
+ unsigned int height = ip->i_di.di_height;
+ uint64_t lblock;
+ struct metapath mp;
+ int error;
+
+ if (!size)
+ lblock = 0;
+ else
+ lblock = (size - 1) >> ip->i_sbd->sd_sb.sb_bsize_shift;
+
+ find_metapath(ip, lblock, &mp);
+ gfs2_alloc_get(ip);
+
+ error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+ if (error)
+ goto out;
+
+ while (height--) {
+ struct strip_mine sm;
+ sm.sm_first = !!size;
+ sm.sm_height = height;
+
+ error = recursive_scan(ip, NULL, &mp, 0, 0, 1, do_strip, &sm);
+ if (error)
+ break;
+ }
+
+ gfs2_quota_unhold(ip);
+
+ out:
+ gfs2_alloc_put(ip);
+ return error;
+}
+
+static int trunc_end(struct gfs2_inode *ip)
+{
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ struct buffer_head *dibh;
+ int error;
+
+ error = gfs2_trans_begin(sdp, RES_DINODE, 0);
+ if (error)
+ return error;
+
+ down_write(&ip->i_rw_mutex);
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto out;
+
+ if (!ip->i_di.di_size) {
+ ip->i_di.di_height = 0;
+ ip->i_di.di_goal_meta =
+ ip->i_di.di_goal_data =
+ ip->i_num.no_addr;
+ gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
+ }
+ ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds();
+ ip->i_di.di_flags &= ~GFS2_DIF_TRUNC_IN_PROG;
+
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
+
+ out:
+ up_write(&ip->i_rw_mutex);
+
+ gfs2_trans_end(sdp);
+
+ return error;
+}
+
+/**
+ * do_shrink - make a file smaller
+ * @ip: the inode
+ * @size: the size to make the file
+ * @truncator: function to truncate the last partial block
+ *
+ * Called with an exclusive lock on @ip.
+ *
+ * Returns: errno
+ */
+
+static int do_shrink(struct gfs2_inode *ip, uint64_t size)
+{
+ int error;
+
+ error = trunc_start(ip, size);
+ if (error < 0)
+ return error;
+ if (error > 0)
+ return 0;
+
+ error = trunc_dealloc(ip, size);
+ if (!error)
+ error = trunc_end(ip);
+
+ return error;
+}
+
+/**
+ * gfs2_truncatei - make a file a given size
+ * @ip: the inode
+ * @size: the size to make the file
+ * @truncator: function to truncate the last partial block
+ *
+ * The file size can grow, shrink, or stay the same size.
+ *
+ * Returns: errno
+ */
+
+int gfs2_truncatei(struct gfs2_inode *ip, uint64_t size)
+{
+ int error;
+
+ if (gfs2_assert_warn(ip->i_sbd, S_ISREG(ip->i_di.di_mode)))
+ return -EINVAL;
+
+ if (size > ip->i_di.di_size)
+ error = do_grow(ip, size);
+ else
+ error = do_shrink(ip, size);
+
+ return error;
+}
+
+int gfs2_truncatei_resume(struct gfs2_inode *ip)
+{
+ int error;
+ error = trunc_dealloc(ip, ip->i_di.di_size);
+ if (!error)
+ error = trunc_end(ip);
+ return error;
+}
+
+int gfs2_file_dealloc(struct gfs2_inode *ip)
+{
+ return trunc_dealloc(ip, 0);
+}
+
+/**
+ * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file
+ * @ip: the file
+ * @len: the number of bytes to be written to the file
+ * @data_blocks: returns the number of data blocks required
+ * @ind_blocks: returns the number of indirect blocks required
+ *
+ */
+
+void gfs2_write_calc_reserv(struct gfs2_inode *ip, unsigned int len,
+ unsigned int *data_blocks, unsigned int *ind_blocks)
+{
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ unsigned int tmp;
+
+ if (gfs2_is_dir(ip)) {
+ *data_blocks = DIV_RU(len, sdp->sd_jbsize) + 2;
+ *ind_blocks = 3 * (sdp->sd_max_jheight - 1);
+ } else {
+ *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3;
+ *ind_blocks = 3 * (sdp->sd_max_height - 1);
+ }
+
+ for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) {
+ tmp = DIV_RU(tmp, sdp->sd_inptrs);
+ *ind_blocks += tmp;
+ }
+}
+
+/**
+ * gfs2_write_alloc_required - figure out if a write will require an allocation
+ * @ip: the file being written to
+ * @offset: the offset to write to
+ * @len: the number of bytes being written
+ * @alloc_required: set to 1 if an alloc is required, 0 otherwise
+ *
+ * Returns: errno
+ */
+
+int gfs2_write_alloc_required(struct gfs2_inode *ip, uint64_t offset,
+ unsigned int len, int *alloc_required)
+{
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ uint64_t lblock, lblock_stop, dblock;
+ uint32_t extlen;
+ int new = 0;
+ int error = 0;
+
+ *alloc_required = 0;
+
+ if (!len)
+ return 0;
+
+ if (gfs2_is_stuffed(ip)) {
+ if (offset + len >
+ sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode))
+ *alloc_required = 1;
+ return 0;
+ }
+
+ if (gfs2_is_dir(ip)) {
+ unsigned int bsize = sdp->sd_jbsize;
+ lblock = offset;
+ do_div(lblock, bsize);
+ lblock_stop = offset + len + bsize - 1;
+ do_div(lblock_stop, bsize);
+ } else {
+ unsigned int shift = sdp->sd_sb.sb_bsize_shift;
+ lblock = offset >> shift;
+ lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift;
+ }
+
+ for (; lblock < lblock_stop; lblock += extlen) {
+ error = gfs2_block_map(ip, lblock, &new, &dblock, &extlen);
+ if (error)
+ return error;
+
+ if (!dblock) {
+ *alloc_required = 1;
+ return 0;
+ }
+ }
+
+ return 0;
+}
+
--- /dev/null
+++ b/fs/gfs2/bmap.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2005 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 v.2.
+ */
+
+#ifndef __BMAP_DOT_H__
+#define __BMAP_DOT_H__
+
+typedef int (*gfs2_unstuffer_t) (struct gfs2_inode * ip,
+ struct buffer_head * dibh, uint64_t block,
+ void *private);
+int gfs2_unstuffer_sync(struct gfs2_inode *ip, struct buffer_head *dibh,
+ uint64_t block, void *private);
+int gfs2_unstuff_dinode(struct gfs2_inode *ip, gfs2_unstuffer_t unstuffer,
+ void *private);
+
+int gfs2_block_map(struct gfs2_inode *ip,
+ uint64_t lblock, int *new,
+ uint64_t *dblock, uint32_t *extlen);
+
+int gfs2_truncatei(struct gfs2_inode *ip, uint64_t size);
+int gfs2_truncatei_resume(struct gfs2_inode *ip);
+int gfs2_file_dealloc(struct gfs2_inode *ip);
+
+void gfs2_write_calc_reserv(struct gfs2_inode *ip, unsigned int len,
+ unsigned int *data_blocks,
+ unsigned int *ind_blocks);
+int gfs2_write_alloc_required(struct gfs2_inode *ip, uint64_t offset,
+ unsigned int len, int *alloc_required);
+
+#endif /* __BMAP_DOT_H__ */
--- /dev/null
+++ b/fs/gfs2/format.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2005 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 v.2.
+ */
+
+#ifndef __FORMAT_DOT_H__
+#define __FORMAT_DOT_H__
+
+static const uint32_t gfs2_old_fs_formats[] = {
+ 0
+};
+
+static const uint32_t gfs2_old_multihost_formats[] = {
+ 0
+};
+
+#endif /* __FORMAT_DOT_H__ */
--- /dev/null
+++ b/fs/gfs2/glops.c
@@ -0,0 +1,487 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2005 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 v.2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <asm/semaphore.h>
+
+#include "gfs2.h"
+#include "bmap.h"
+#include "glock.h"
+#include "glops.h"
+#include "inode.h"
+#include "log.h"
+#include "meta_io.h"
+#include "page.h"
+#include "recovery.h"
+#include "rgrp.h"
+
+/**
+ * meta_go_sync - sync out the metadata for this glock
+ * @gl: the glock
+ * @flags: DIO_*
+ *
+ * Called when demoting or unlocking an EX glock. We must flush
+ * to disk all dirty buffers/pages relating to this glock, and must not
+ * not return to caller to demote/unlock the glock until I/O is complete.
+ */
+
+static void meta_go_sync(struct gfs2_glock *gl, int flags)
+{
+ if (!(flags & DIO_METADATA))
+ return;
+
+ if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {
+ gfs2_log_flush_glock(gl);
+ gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
+ if (flags & DIO_RELEASE)
+ gfs2_ail_empty_gl(gl);
+ }
+
+ clear_bit(GLF_SYNC, &gl->gl_flags);
+}
+
+/**
+ * meta_go_inval - invalidate the metadata for this glock
+ * @gl: the glock
+ * @flags:
+ *
+ */
+
+static void meta_go_inval(struct gfs2_glock *gl, int flags)
+{
+ if (!(flags & DIO_METADATA))
+ return;
+
+ gfs2_meta_inval(gl);
+ gl->gl_vn++;
+}
+
+/**
+ * meta_go_demote_ok - Check to see if it's ok to unlock a glock
+ * @gl: the glock
+ *
+ * Returns: 1 if we have no cached data; ok to demote meta glock
+ */
+
+static int meta_go_demote_ok(struct gfs2_glock *gl)
+{
+ return !gl->gl_aspace->i_mapping->nrpages;
+}
+
+/**
+ * inode_go_xmote_th - promote/demote a glock
+ * @gl: the glock
+ * @state: the requested state
+ * @flags:
+ *
+ */
+
+static void inode_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
+ int flags)
+{
+ if (gl->gl_state != LM_ST_UNLOCKED)
+ gfs2_pte_inval(gl);
+ gfs2_glock_xmote_th(gl, state, flags);
+}
+
+/**
+ * inode_go_xmote_bh - After promoting/demoting a glock
+ * @gl: the glock
+ *
+ */
+
+static void inode_go_xmote_bh(struct gfs2_glock *gl)
+{
+ struct gfs2_holder *gh = gl->gl_req_gh;
+ struct buffer_head *bh;
+ int error;
+
+ if (gl->gl_state != LM_ST_UNLOCKED &&
+ (!gh || !(gh->gh_flags & GL_SKIP))) {
+ error = gfs2_meta_read(gl, gl->gl_name.ln_number, DIO_START,
+ &bh);
+ if (!error)
+ brelse(bh);
+ }
+}
+
+/**
+ * inode_go_drop_th - unlock a glock
+ * @gl: the glock
+ *
+ * Invoked from rq_demote().
+ * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
+ * is being purged from our node's glock cache; we're dropping lock.
+ */
+
+static void inode_go_drop_th(struct gfs2_glock *gl)
+{
+ gfs2_pte_inval(gl);
+ gfs2_glock_drop_th(gl);
+}
+
+/**
+ * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
+ * @gl: the glock protecting the inode
+ * @flags:
+ *
+ */
+
+static void inode_go_sync(struct gfs2_glock *gl, int flags)
+{
+ int meta = (flags & DIO_METADATA);
+ int data = (flags & DIO_DATA);
+
+ if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
+ if (meta && data) {
+ gfs2_page_sync(gl, flags | DIO_START);
+ gfs2_log_flush_glock(gl);
+ gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
+ gfs2_page_sync(gl, flags | DIO_WAIT);
+ clear_bit(GLF_DIRTY, &gl->gl_flags);
+ } else if (meta) {
+ gfs2_log_flush_glock(gl);
+ gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT);
+ } else if (data)
+ gfs2_page_sync(gl, flags | DIO_START | DIO_WAIT);
+ if (flags & DIO_RELEASE)
+ gfs2_ail_empty_gl(gl);
+ }
+
+ clear_bit(GLF_SYNC, &gl->gl_flags);
+}
+
+/**
+ * inode_go_inval - prepare a inode glock to be released
+ * @gl: the glock
+ * @flags:
+ *
+ */
+
+static void inode_go_inval(struct gfs2_glock *gl, int flags)
+{
+ int meta = (flags & DIO_METADATA);
+ int data = (flags & DIO_DATA);
+
+ if (meta) {
+ gfs2_meta_inval(gl);
+ gl->gl_vn++;
+ }
+ if (data)
+ gfs2_page_inval(gl);
+}
+
+/**
+ * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
+ * @gl: the glock
+ *
+ * Returns: 1 if it's ok
+ */
+
+static int inode_go_demote_ok(struct gfs2_glock *gl)
+{
+ struct gfs2_sbd *sdp = gl->gl_sbd;
+ int demote = 0;
+
+ if (!get_gl2ip(gl) && !gl->gl_aspace->i_mapping->nrpages)
+ demote = 1;
+ else if (!sdp->sd_args.ar_localcaching &&
+ time_after_eq(jiffies, gl->gl_stamp +
+ gfs2_tune_get(sdp, gt_demote_secs) * HZ))
+ demote = 1;
+
+ return demote;
+}
+
+/**
+ * inode_go_lock - operation done after an inode lock is locked by a process
+ * @gl: the glock
+ * @flags:
+ *
+ * Returns: errno
+ */
+
+static int inode_go_lock(struct gfs2_holder *gh)
+{
+ struct gfs2_glock *gl = gh->gh_gl;
+ struct gfs2_inode *ip = get_gl2ip(gl);
+ int error = 0;
+
+ if (!ip)
+ return 0;
+
+ if (ip->i_vn != gl->gl_vn) {
+ error = gfs2_inode_refresh(ip);
+ if (error)
+ return error;
+ gfs2_inode_attr_in(ip);
+ }
+
+ if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&
+ (gl->gl_state == LM_ST_EXCLUSIVE) &&
+ (gh->gh_flags & GL_LOCAL_EXCL))
+ error = gfs2_truncatei_resume(ip);
+
+ return error;
+}
+
+/**
+ * inode_go_unlock - operation done before an inode lock is unlocked by a
+ * process
+ * @gl: the glock
+ * @flags:
+ *
+ */
+
+static void inode_go_unlock(struct gfs2_holder *gh)
+{
+ struct gfs2_glock *gl = gh->gh_gl;
+ struct gfs2_inode *ip = get_gl2ip(gl);
+
+ if (ip && test_bit(GLF_DIRTY, &gl->gl_flags))
+ gfs2_inode_attr_in(ip);
+
+ if (ip)
+ gfs2_meta_cache_flush(ip);
+}
+
+/**
+ * inode_greedy -
+ * @gl: the glock
+ *
+ */
+
+static void inode_greedy(struct gfs2_glock *gl)
+{
+ struct gfs2_sbd *sdp = gl->gl_sbd;
+ struct gfs2_inode *ip = get_gl2ip(gl);
+ unsigned int quantum = gfs2_tune_get(sdp, gt_greedy_quantum);
+ unsigned int max = gfs2_tune_get(sdp, gt_greedy_max);
+ unsigned int new_time;
+
+ spin_lock(&ip->i_spin);
+
+ if (time_after(ip->i_last_pfault + quantum, jiffies)) {
+ new_time = ip->i_greedy + quantum;
+ if (new_time > max)
+ new_time = max;
+ } else {
+ new_time = ip->i_greedy - quantum;
+ if (!new_time || new_time > max)
+ new_time = 1;
+ }
+
+ ip->i_greedy = new_time;
+
+ spin_unlock(&ip->i_spin);
+
+ gfs2_inode_put(ip);
+}
+
+/**
+ * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
+ * @gl: the glock
+ *
+ * Returns: 1 if it's ok
+ */
+
+static int rgrp_go_demote_ok(struct gfs2_glock *gl)
+{
+ return !gl->gl_aspace->i_mapping->nrpages;
+}
+
+/**
+ * rgrp_go_lock - operation done after an rgrp lock is locked by
+ * a first holder on this node.
+ * @gl: the glock
+ * @flags:
+ *
+ * Returns: errno
+ */
+
+static int rgrp_go_lock(struct gfs2_holder *gh)
+{
+ return gfs2_rgrp_bh_get(get_gl2rgd(gh->gh_gl));
+}
+
+/**
+ * rgrp_go_unlock - operation done before an rgrp lock is unlocked by
+ * a last holder on this node.
+ * @gl: the glock
+ * @flags:
+ *
+ */
+
+static void rgrp_go_unlock(struct gfs2_holder *gh)
+{
+ gfs2_rgrp_bh_put(get_gl2rgd(gh->gh_gl));
+}
+
+/**
+ * trans_go_xmote_th - promote/demote the transaction glock
+ * @gl: the glock
+ * @state: the requested state
+ * @flags:
+ *
+ */
+
+static void trans_go_xmote_th(struct gfs2_glock *gl, unsigned int state,
+ int flags)
+{
+ struct gfs2_sbd *sdp = gl->gl_sbd;
+
+ if (gl->gl_state != LM_ST_UNLOCKED &&
+ test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
+ gfs2_meta_syncfs(sdp);
+ gfs2_log_shutdown(sdp);
+ }
+
+ gfs2_glock_xmote_th(gl, state, flags);
+}
+
+/**
+ * trans_go_xmote_bh - After promoting/demoting the transaction glock
+ * @gl: the glock
+ *
+ */
+
+static void trans_go_xmote_bh(struct gfs2_glock *gl)
+{
+ struct gfs2_sbd *sdp = gl->gl_sbd;
+ struct gfs2_glock *j_gl = get_v2ip(sdp->sd_jdesc->jd_inode)->i_gl;
+ struct gfs2_log_header head;
+ int error;
+
+ if (gl->gl_state != LM_ST_UNLOCKED &&
+ test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
+ gfs2_meta_cache_flush(get_v2ip(sdp->sd_jdesc->jd_inode));
+ j_gl->gl_ops->go_inval(j_gl, DIO_METADATA | DIO_DATA);
+
+ error = gfs2_find_jhead(sdp->sd_jdesc, &head);
+ if (error)
+ gfs2_consist(sdp);
+ if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
+ gfs2_consist(sdp);
+
+ /* Initialize some head of the log stuff */
+ if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
+ sdp->sd_log_sequence = head.lh_sequence + 1;
+ gfs2_log_pointers_init(sdp, head.lh_blkno);
+ }
+ }
+}
+
+/**
+ * trans_go_drop_th - unlock the transaction glock
+ * @gl: the glock
+ *
+ * We want to sync the device even with localcaching. Remember
+ * that localcaching journal replay only marks buffers dirty.
+ */
+
+static void trans_go_drop_th(struct gfs2_glock *gl)
+{
+ struct gfs2_sbd *sdp = gl->gl_sbd;
+
+ if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
+ gfs2_meta_syncfs(sdp);
+ gfs2_log_shutdown(sdp);
+ }
+
+ gfs2_glock_drop_th(gl);
+}
+
+/**
+ * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
+ * @gl: the glock
+ *
+ * Returns: 1 if it's ok
+ */
+
+static int quota_go_demote_ok(struct gfs2_glock *gl)
+{
+ return !atomic_read(&gl->gl_lvb_count);
+}
+
+struct gfs2_glock_operations gfs2_meta_glops = {
+ .go_xmote_th = gfs2_glock_xmote_th,
+ .go_drop_th = gfs2_glock_drop_th,
+ .go_sync = meta_go_sync,
+ .go_inval = meta_go_inval,
+ .go_demote_ok = meta_go_demote_ok,
+ .go_type = LM_TYPE_META
+};
+
+struct gfs2_glock_operations gfs2_inode_glops = {
+ .go_xmote_th = inode_go_xmote_th,
+ .go_xmote_bh = inode_go_xmote_bh,
+ .go_drop_th = inode_go_drop_th,
+ .go_sync = inode_go_sync,
+ .go_inval = inode_go_inval,
+ .go_demote_ok = inode_go_demote_ok,
+ .go_lock = inode_go_lock,
+ .go_unlock = inode_go_unlock,
+ .go_greedy = inode_greedy,
+ .go_type = LM_TYPE_INODE
+};
+
+struct gfs2_glock_operations gfs2_rgrp_glops = {
+ .go_xmote_th = gfs2_glock_xmote_th,
+ .go_drop_th = gfs2_glock_drop_th,
+ .go_sync = meta_go_sync,
+ .go_inval = meta_go_inval,
+ .go_demote_ok = rgrp_go_demote_ok,
+ .go_lock = rgrp_go_lock,
+ .go_unlock = rgrp_go_unlock,
+ .go_type = LM_TYPE_RGRP
+};
+
+struct gfs2_glock_operations gfs2_trans_glops = {
+ .go_xmote_th = trans_go_xmote_th,
+ .go_xmote_bh = trans_go_xmote_bh,
+ .go_drop_th = trans_go_drop_th,
+ .go_type = LM_TYPE_NONDISK
+};
+
+struct gfs2_glock_operations gfs2_iopen_glops = {
+ .go_xmote_th = gfs2_glock_xmote_th,
+ .go_drop_th = gfs2_glock_drop_th,
+ .go_callback = gfs2_iopen_go_callback,
+ .go_type = LM_TYPE_IOPEN
+};
+
+struct gfs2_glock_operations gfs2_flock_glops = {
+ .go_xmote_th = gfs2_glock_xmote_th,
+ .go_drop_th = gfs2_glock_drop_th,
+ .go_type = LM_TYPE_FLOCK
+};
+
+struct gfs2_glock_operations gfs2_nondisk_glops = {
+ .go_xmote_th = gfs2_glock_xmote_th,
+ .go_drop_th = gfs2_glock_drop_th,
+ .go_type = LM_TYPE_NONDISK
+};
+
+struct gfs2_glock_operations gfs2_quota_glops = {
+ .go_xmote_th = gfs2_glock_xmote_th,
+ .go_drop_th = gfs2_glock_drop_th,
+ .go_demote_ok = quota_go_demote_ok,
+ .go_type = LM_TYPE_QUOTA
+};
+
+struct gfs2_glock_operations gfs2_journal_glops = {
+ .go_xmote_th = gfs2_glock_xmote_th,
+ .go_drop_th = gfs2_glock_drop_th,
+ .go_type = LM_TYPE_JOURNAL
+};
+
--- /dev/null
+++ b/fs/gfs2/glops.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2005 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 v.2.
+ */
+
+#ifndef __GLOPS_DOT_H__
+#define __GLOPS_DOT_H__
+
+extern struct gfs2_glock_operations gfs2_meta_glops;
+extern struct gfs2_glock_operations gfs2_inode_glops;
+extern struct gfs2_glock_operations gfs2_rgrp_glops;
+extern struct gfs2_glock_operations gfs2_trans_glops;
+extern struct gfs2_glock_operations gfs2_iopen_glops;
+extern struct gfs2_glock_operations gfs2_flock_glops;
+extern struct gfs2_glock_operations gfs2_nondisk_glops;
+extern struct gfs2_glock_operations gfs2_quota_glops;
+extern struct gfs2_glock_operations gfs2_journal_glops;
+
+#endif /* __GLOPS_DOT_H__ */
--- /dev/null
+++ b/fs/gfs2/inode.c
@@ -0,0 +1,1835 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2005 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 v.2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/posix_acl.h>
+#include <linux/sort.h>
+#include <asm/semaphore.h>
+
+#include "gfs2.h"
+#include "acl.h"
+#include "bmap.h"
+#include "dir.h"
+#include "eattr.h"
+#include "glock.h"
+#include "glops.h"
+#include "inode.h"
+#include "log.h"
+#include "meta_io.h"
+#include "ops_address.h"
+#include "ops_file.h"
+#include "ops_inode.h"
+#include "quota.h"
+#include "rgrp.h"
+#include "trans.h"
+#include "unlinked.h"
+
+/**
+ * inode_attr_in - Copy attributes from the dinode into the VFS inode
+ * @ip: The GFS2 inode (with embedded disk inode data)
+ * @inode: The Linux VFS inode
+ *
+ */
+
+static void inode_attr_in(struct gfs2_inode *ip, struct inode *inode)
+{
+ inode->i_ino = ip->i_num.no_formal_ino;
+
+ switch (ip->i_di.di_mode & S_IFMT) {
+ case S_IFBLK:
+ case S_IFCHR:
+ inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor);
+ break;
+ default:
+ inode->i_rdev = 0;
+ break;
+ };
+
+ inode->i_mode = ip->i_di.di_mode;
+ inode->i_nlink = ip->i_di.di_nlink;
+ inode->i_uid = ip->i_di.di_uid;
+ inode->i_gid = ip->i_di.di_gid;
+ i_size_write(inode, ip->i_di.di_size);
+ inode->i_atime.tv_sec = ip->i_di.di_atime;
+ inode->i_mtime.tv_sec = ip->i_di.di_mtime;
+ inode->i_ctime.tv_sec = ip->i_di.di_ctime;
+ inode->i_atime.tv_nsec = 0;
+ inode->i_mtime.tv_nsec = 0;
+ inode->i_ctime.tv_nsec = 0;
+ inode->i_blksize = PAGE_SIZE;
+ inode->i_blocks = ip->i_di.di_blocks <<
+ (ip->i_sbd->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
+
+ if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE)
+ inode->i_flags |= S_IMMUTABLE;
+ else
+ inode->i_flags &= ~S_IMMUTABLE;
+
+ if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY)
+ inode->i_flags |= S_APPEND;
+ else
+ inode->i_flags &= ~S_APPEND;
+}
+
+/**
+ * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode
+ * @ip: The GFS2 inode (with embedded disk inode data)
+ *
+ */
+
+void gfs2_inode_attr_in(struct gfs2_inode *ip)
+{
+ struct inode *inode;
+
+ inode = gfs2_ip2v_lookup(ip);
+ if (inode) {
+ inode_attr_in(ip, inode);
+ iput(inode);
+ }
+}
+
+/**
+ * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
+ * @ip: The GFS2 inode
+ *
+ * Only copy out the attributes that we want the VFS layer
+ * to be able to modify.
+ */
+
+void gfs2_inode_attr_out(struct gfs2_inode *ip)
+{
+ struct inode *inode = ip->i_vnode;
+
+ gfs2_assert_withdraw(ip->i_sbd,
+ (ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT));
+ ip->i_di.di_mode = inode->i_mode;
+ ip->i_di.di_uid = inode->i_uid;
+ ip->i_di.di_gid = inode->i_gid;
+ ip->i_di.di_atime = inode->i_atime.tv_sec;
+ ip->i_di.di_mtime = inode->i_mtime.tv_sec;
+ ip->i_di.di_ctime = inode->i_ctime.tv_sec;
+}
+
+/**
+ * gfs2_ip2v_lookup - Get the struct inode for a struct gfs2_inode
+ * @ip: the struct gfs2_inode to get the struct inode for
+ *
+ * Returns: A VFS inode, or NULL if none
+ */
+
+struct inode *gfs2_ip2v_lookup(struct gfs2_inode *ip)
+{
+ struct inode *inode = NULL;
+
+ gfs2_assert_warn(ip->i_sbd, test_bit(GIF_MIN_INIT, &ip->i_flags));
+
+ spin_lock(&ip->i_spin);
+ if (ip->i_vnode)
+ inode = igrab(ip->i_vnode);
+ spin_unlock(&ip->i_spin);
+
+ return inode;
+}
+
+/**
+ * gfs2_ip2v - Get/Create a struct inode for a struct gfs2_inode
+ * @ip: the struct gfs2_inode to get the struct inode for
+ *
+ * Returns: A VFS inode, or NULL if no mem
+ */
+
+struct inode *gfs2_ip2v(struct gfs2_inode *ip)
+{
+ struct inode *inode, *tmp;
+
+ inode = gfs2_ip2v_lookup(ip);
+ if (inode)
+ return inode;
+
+ tmp = new_inode(ip->i_sbd->sd_vfs);
+ if (!tmp)
+ return NULL;
+
+ inode_attr_in(ip, tmp);
+
+ if (S_ISREG(ip->i_di.di_mode)) {
+ tmp->i_op = &gfs2_file_iops;
+ tmp->i_fop = &gfs2_file_fops;
+ tmp->i_mapping->a_ops = &gfs2_file_aops;
+ } else if (S_ISDIR(ip->i_di.di_mode)) {
+ tmp->i_op = &gfs2_dir_iops;
+ tmp->i_fop = &gfs2_dir_fops;
+ } else if (S_ISLNK(ip->i_di.di_mode)) {
+ tmp->i_op = &gfs2_symlink_iops;
+ } else {
+ tmp->i_op = &gfs2_dev_iops;
+ init_special_inode(tmp, tmp->i_mode, tmp->i_rdev);
+ }
+
+ set_v2ip(tmp, NULL);
+
+ for (;;) {
+ spin_lock(&ip->i_spin);
+ if (!ip->i_vnode)
+ break;
+ inode = igrab(ip->i_vnode);
+ spin_unlock(&ip->i_spin);
+
+ if (inode) {
+ iput(tmp);
+ return inode;
+ }
+ yield();
+ }
+
+ inode = tmp;
+
+ gfs2_inode_hold(ip);
+ ip->i_vnode = inode;
+ set_v2ip(inode, ip);
+
+ spin_unlock(&ip->i_spin);
+
+ insert_inode_hash(inode);
+
+ return inode;
+}
+
+static int iget_test(struct inode *inode, void *opaque)
+{
+ struct gfs2_inode *ip = get_v2ip(inode);
+ struct gfs2_inum *inum = (struct gfs2_inum *)opaque;
+
+ if (ip && ip->i_num.no_addr == inum->no_addr)
+ return 1;
+
+ return 0;
+}
+
+struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum)
+{
+ return ilookup5(sb, (unsigned long)inum->no_formal_ino,
+ iget_test, inum);
+}
+
+void gfs2_inode_min_init(struct gfs2_inode *ip, unsigned int type)
+{
+ spin_lock(&ip->i_spin);
+ if (!test_and_set_bit(GIF_MIN_INIT, &ip->i_flags)) {
+ ip->i_di.di_nlink = 1;
+ ip->i_di.di_mode = DT2IF(type);
+ }
+ spin_unlock(&ip->i_spin);
+}
+
+/**
+ * gfs2_inode_refresh - Refresh the incore copy of the dinode
+ * @ip: The GFS2 inode
+ *
+ * Returns: errno
+ */
+
+int gfs2_inode_refresh(struct gfs2_inode *ip)
+{
+ struct buffer_head *dibh;
+ int error;
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ return error;
+
+ if (gfs2_metatype_check(ip->i_sbd, dibh, GFS2_METATYPE_DI)) {
+ brelse(dibh);
+ return -EIO;
+ }
+
+ spin_lock(&ip->i_spin);
+ gfs2_dinode_in(&ip->i_di, dibh->b_data);
+ set_bit(GIF_MIN_INIT, &ip->i_flags);
+ spin_unlock(&ip->i_spin);
+
+ brelse(dibh);
+
+ if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) {
+ if (gfs2_consist_inode(ip))
+ gfs2_dinode_print(&ip->i_di);
+ return -EIO;
+ }
+ if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino)
+ return -ESTALE;
+
+ ip->i_vn = ip->i_gl->gl_vn;
+
+ return 0;
+}
+
+/**
+ * inode_create - create a struct gfs2_inode
+ * @i_gl: The glock covering the inode
+ * @inum: The inode number
+ * @io_gl: the iopen glock to acquire/hold (using holder in new gfs2_inode)
+ * @io_state: the state the iopen glock should be acquired in
+ * @ipp: pointer to put the returned inode in
+ *
+ * Returns: errno
+ */
+
+static int inode_create(struct gfs2_glock *i_gl, struct gfs2_inum *inum,
+ struct gfs2_glock *io_gl, unsigned int io_state,
+ struct gfs2_inode **ipp)
+{
+ struct gfs2_sbd *sdp = i_gl->gl_sbd;
+ struct gfs2_inode *ip;
+ int error = 0;
+
+ ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
+ if (!ip)
+ return -ENOMEM;
+ memset(ip, 0, sizeof(struct gfs2_inode));
+
+ ip->i_num = *inum;
+
+ atomic_set(&ip->i_count, 1);
+
+ ip->i_vn = i_gl->gl_vn - 1;
+
+ ip->i_gl = i_gl;
+ ip->i_sbd = sdp;
+
+ spin_lock_init(&ip->i_spin);
+ init_rwsem(&ip->i_rw_mutex);
+
+ ip->i_greedy = gfs2_tune_get(sdp, gt_greedy_default);
+
+ error = gfs2_glock_nq_init(io_gl,
+ io_state, GL_LOCAL_EXCL | GL_EXACT,
+ &ip->i_iopen_gh);
+ if (error)
+ goto fail;
+ ip->i_iopen_gh.gh_owner = NULL;
+
+ spin_lock(&io_gl->gl_spin);
+ gfs2_glock_hold(i_gl);
+ set_gl2gl(io_gl, i_gl);
+ spin_unlock(&io_gl->gl_spin);
+
+ gfs2_glock_hold(i_gl);
+ set_gl2ip(i_gl, ip);
+
+ atomic_inc(&sdp->sd_inode_count);
+
+ *ipp = ip;
+
+ return 0;
+
+ fail:
+ gfs2_meta_cache_flush(ip);
+ kmem_cache_free(gfs2_inode_cachep, ip);
+ *ipp = NULL;
+
+ return error;
+}
+
+/**
+ * gfs2_inode_get - Create or get a reference on an inode
+ * @i_gl: The glock covering the inode
+ * @inum: The inode number
+ * @create:
+ * @ipp: pointer to put the returned inode in
+ *
+ * Returns: errno
+ */
+
+int gfs2_inode_get(struct gfs2_glock *i_gl, struct gfs2_inum *inum, int create,
+ struct gfs2_inode **ipp)
+{
+ struct gfs2_sbd *sdp = i_gl->gl_sbd;
+ struct gfs2_glock *io_gl;
+ int error = 0;
+
+ gfs2_glmutex_lock(i_gl);
+
+ *ipp = get_gl2ip(i_gl);
+ if (*ipp) {
+ error = -ESTALE;
+ if ((*ipp)->i_num.no_formal_ino != inum->no_formal_ino)
+ goto out;
+ atomic_inc(&(*ipp)->i_count);
+ error = 0;
+ goto out;
+ }
+
+ if (!create)
+ goto out;
+
+ error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops,
+ CREATE, &io_gl);
+ if (!error) {
+ error = inode_create(i_gl, inum, io_gl, LM_ST_SHARED, ipp);
+ gfs2_glock_put(io_gl);
+ }
+
+ out:
+ gfs2_glmutex_unlock(i_gl);
+
+ return error;
+}
+
+void gfs2_inode_hold(struct gfs2_inode *ip)
+{
+ gfs2_assert(ip->i_sbd, atomic_read(&ip->i_count) > 0);
+ atomic_inc(&ip->i_count);
+}
+
+void gfs2_inode_put(struct gfs2_inode *ip)
+{
+ gfs2_assert(ip->i_sbd, atomic_read(&ip->i_count) > 0);
+ atomic_dec(&ip->i_count);
+}
+
+void gfs2_inode_destroy(struct gfs2_inode *ip)
+{
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ struct gfs2_glock *io_gl = ip->i_iopen_gh.gh_gl;
+ struct gfs2_glock *i_gl = ip->i_gl;
+
+ gfs2_assert_warn(sdp, !atomic_read(&ip->i_count));
+ gfs2_assert(sdp, get_gl2gl(io_gl) == i_gl);
+
+ spin_lock(&io_gl->gl_spin);
+ set_gl2gl(io_gl, NULL);
+ gfs2_glock_put(i_gl);
+ spin_unlock(&io_gl->gl_spin);
+
+ gfs2_glock_dq_uninit(&ip->i_iopen_gh);
+
+ gfs2_meta_cache_flush(ip);
+ kmem_cache_free(gfs2_inode_cachep, ip);
+
+ set_gl2ip(i_gl, NULL);
+ gfs2_glock_put(i_gl);
+
+ atomic_dec(&sdp->sd_inode_count);
+}
+
+static int dinode_dealloc(struct gfs2_inode *ip, struct gfs2_unlinked *ul)
+{
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ struct gfs2_alloc *al;
+ struct gfs2_rgrpd *rgd;
+ int error;
+
+ if (ip->i_di.di_blocks != 1) {
+ if (gfs2_consist_inode(ip))
+ gfs2_dinode_print(&ip->i_di);
+ return -EIO;
+ }
+
+ al = gfs2_alloc_get(ip);
+
+ error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+ if (error)
+ goto out;
+
+ error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
+ if (error)
+ goto out_qs;
+
+ rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
+ if (!rgd) {
+ gfs2_consist_inode(ip);
+ error = -EIO;
+ goto out_rindex_relse;
+ }
+
+ error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
+ &al->al_rgd_gh);
+ if (error)
+ goto out_rindex_relse;
+
+ error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_UNLINKED +
+ RES_STATFS + RES_QUOTA, 1);
+ if (error)
+ goto out_rg_gunlock;
+
+ gfs2_trans_add_gl(ip->i_gl);
+
+ gfs2_free_di(rgd, ip);
+
+ error = gfs2_unlinked_ondisk_rm(sdp, ul);
+
+ gfs2_trans_end(sdp);
+ clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
+
+ out_rg_gunlock:
+ gfs2_glock_dq_uninit(&al->al_rgd_gh);
+
+ out_rindex_relse:
+ gfs2_glock_dq_uninit(&al->al_ri_gh);
+
+ out_qs:
+ gfs2_quota_unhold(ip);
+
+ out:
+ gfs2_alloc_put(ip);
+
+ return error;
+}
+
+/**
+ * inode_dealloc - Deallocate all on-disk blocks for an inode (dinode)
+ * @sdp: the filesystem
+ * @inum: the inode number to deallocate
+ * @io_gh: a holder for the iopen glock for this inode
+ *
+ * Returns: errno
+ */
+
+static int inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul,
+ struct gfs2_holder *io_gh)
+{
+ struct gfs2_inode *ip;
+ struct gfs2_holder i_gh;
+ int error;
+
+ error = gfs2_glock_nq_num(sdp,
+ ul->ul_ut.ut_inum.no_addr, &gfs2_inode_glops,
+ LM_ST_EXCLUSIVE, 0, &i_gh);
+ if (error)
+ return error;
+
+ /* We reacquire the iopen lock here to avoid a race with the NFS server
+ calling gfs2_read_inode() with the inode number of a inode we're in
+ the process of deallocating. And we can't keep our hold on the lock
+ from inode_dealloc_init() for deadlock reasons. */
+
+ gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY, io_gh);
+ error = gfs2_glock_nq(io_gh);
+ switch (error) {
+ case 0:
+ break;
+ case GLR_TRYFAILED:
+ error = 1;
+ default:
+ goto out;
+ }
+
+ gfs2_assert_warn(sdp, !get_gl2ip(i_gh.gh_gl));
+ error = inode_create(i_gh.gh_gl, &ul->ul_ut.ut_inum, io_gh->gh_gl,
+ LM_ST_EXCLUSIVE, &ip);
+
+ gfs2_glock_dq(io_gh);
+
+ if (error)
+ goto out;
+
+ error = gfs2_inode_refresh(ip);
+ if (error)
+ goto out_iput;
+
+ if (ip->i_di.di_nlink) {
+ if (gfs2_consist_inode(ip))
+ gfs2_dinode_print(&ip->i_di);
+ error = -EIO;
+ goto out_iput;
+ }
+
+ if (S_ISDIR(ip->i_di.di_mode) &&
+ (ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
+ error = gfs2_dir_exhash_dealloc(ip);
+ if (error)
+ goto out_iput;
+ }
+
+ if (ip->i_di.di_eattr) {
+ error = gfs2_ea_dealloc(ip);
+ if (error)
+ goto out_iput;
+ }
+
+ if (!gfs2_is_stuffed(ip)) {
+ error = gfs2_file_dealloc(ip);
+ if (error)
+ goto out_iput;
+ }
+
+ error = dinode_dealloc(ip, ul);
+ if (error)
+ goto out_iput;
+
+ out_iput:
+ gfs2_glmutex_lock(i_gh.gh_gl);
+ gfs2_inode_put(ip);
+ gfs2_inode_destroy(ip);
+ gfs2_glmutex_unlock(i_gh.gh_gl);
+
+ out:
+ gfs2_glock_dq_uninit(&i_gh);
+
+ return error;
+}
+
+/**
+ * try_inode_dealloc - Try to deallocate an inode and all its blocks
+ * @sdp: the filesystem
+ *
+ * Returns: 0 on success, -errno on error, 1 on busy (inode open)
+ */
+
+static int try_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul)
+{
+ struct gfs2_holder io_gh;
+ int error = 0;
+
+ gfs2_try_toss_inode(sdp, &ul->ul_ut.ut_inum);
+
+ error = gfs2_glock_nq_num(sdp,
+ ul->ul_ut.ut_inum.no_addr, &gfs2_iopen_glops,
+ LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB, &io_gh);
+ switch (error) {
+ case 0:
+ break;
+ case GLR_TRYFAILED:
+ return 1;
+ default:
+ return error;
+ }
+
+ gfs2_glock_dq(&io_gh);
+ error = inode_dealloc(sdp, ul, &io_gh);
+ gfs2_holder_uninit(&io_gh);
+
+ return error;
+}
+
+static int inode_dealloc_uninit(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul)
+{
+ struct gfs2_rgrpd *rgd;
+ struct gfs2_holder ri_gh, rgd_gh;
+ int error;
+
+ error = gfs2_rindex_hold(sdp, &ri_gh);
+ if (error)
+ return error;
+
+ rgd = gfs2_blk2rgrpd(sdp, ul->ul_ut.ut_inum.no_addr);
+ if (!rgd) {
+ gfs2_consist(sdp);
+ error = -EIO;
+ goto out;
+ }
+
+ error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rgd_gh);
+ if (error)
+ goto out;
+
+ error = gfs2_trans_begin(sdp,
+ RES_RG_BIT + RES_UNLINKED + RES_STATFS,
+ 0);
+ if (error)
+ goto out_gunlock;
+
+ gfs2_free_uninit_di(rgd, ul->ul_ut.ut_inum.no_addr);
+ gfs2_unlinked_ondisk_rm(sdp, ul);
+
+ gfs2_trans_end(sdp);
+
+ out_gunlock:
+ gfs2_glock_dq_uninit(&rgd_gh);
+ out:
+ gfs2_glock_dq_uninit(&ri_gh);
+
+ return error;
+}
+
+int gfs2_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul)
+{
+ if (ul->ul_ut.ut_flags & GFS2_UTF_UNINIT)
+ return inode_dealloc_uninit(sdp, ul);
+ else
+ return try_inode_dealloc(sdp, ul);
+}
+
+/**
+ * gfs2_change_nlink - Change nlink count on inode
+ * @ip: The GFS2 inode
+ * @diff: The change in the nlink count required
+ *
+ * Returns: errno
+ */
+
+int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
+{
+ struct buffer_head *dibh;
+ uint32_t nlink;
+ int error;
+
+ nlink = ip->i_di.di_nlink + diff;
+
+ /* If we are reducing the nlink count, but the new value ends up being
+ bigger than the old one, we must have underflowed. */
+ if (diff < 0 && nlink > ip->i_di.di_nlink) {
+ if (gfs2_consist_inode(ip))
+ gfs2_dinode_print(&ip->i_di);
+ return -EIO;
+ }
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ return error;
+
+ ip->i_di.di_nlink = nlink;
+ ip->i_di.di_ctime = get_seconds();
+
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
+
+ return 0;
+}
+
+/**
+ * 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
+ *
+ * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
+ * @is_root is true.
+ *
+ * Returns: errno
+ */
+
+int gfs2_lookupi(struct inode *dir, struct qstr *name, int is_root,
+ struct inode **inodep)
+{
+ struct gfs2_inode *ipp;
+ struct gfs2_inode *dip = get_v2ip(dir);
+ struct gfs2_sbd *sdp = dip->i_sbd;
+ struct gfs2_holder d_gh;
+ struct gfs2_inum inum;
+ unsigned int type;
+ struct gfs2_glock *gl;
+ int error = 0;
+
+ *inodep = NULL;
+
+ if (!name->len || name->len > GFS2_FNAMESIZE)
+ return -ENAMETOOLONG;
+
+ if (gfs2_filecmp(name, ".", 1) ||
+ (gfs2_filecmp(name, "..", 2) && dir == sdp->sd_root_dir)) {
+ gfs2_inode_hold(dip);
+ ipp = dip;
+ goto done;
+ }
+
+ error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
+ if (error)
+ return error;
+
+ if (!is_root) {
+ error = gfs2_repermission(dip->i_vnode, MAY_EXEC, NULL);
+ if (error)
+ goto out;
+ }
+
+ error = gfs2_dir_search(dip, name, &inum, &type);
+ if (error)
+ goto out;
+
+ error = gfs2_glock_get(sdp, inum.no_addr, &gfs2_inode_glops,
+ CREATE, &gl);
+ if (error)
+ goto out;
+
+ error = gfs2_inode_get(gl, &inum, CREATE, &ipp);
+ if (!error)
+ gfs2_inode_min_init(ipp, type);
+
+ gfs2_glock_put(gl);
+
+out:
+ gfs2_glock_dq_uninit(&d_gh);
+done:
+ if (error == 0) {
+ *inodep = gfs2_ip2v(ipp);
+ if (!*inodep)
+ error = -ENOMEM;
+ gfs2_inode_put(ipp);
+ }
+ return error;
+}
+
+static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino)
+{
+ struct gfs2_inode *ip = get_v2ip(sdp->sd_ir_inode);
+ struct buffer_head *bh;
+ struct gfs2_inum_range ir;
+ int error;
+
+ error = gfs2_trans_begin(sdp, RES_DINODE, 0);
+ if (error)
+ return error;
+ mutex_lock(&sdp->sd_inum_mutex);
+
+ error = gfs2_meta_inode_buffer(ip, &bh);
+ if (error) {
+ mutex_unlock(&sdp->sd_inum_mutex);
+ gfs2_trans_end(sdp);
+ return error;
+ }
+
+ gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
+
+ if (ir.ir_length) {
+ *formal_ino = ir.ir_start++;
+ ir.ir_length--;
+ gfs2_trans_add_bh(ip->i_gl, bh, 1);
+ gfs2_inum_range_out(&ir,
+ bh->b_data + sizeof(struct gfs2_dinode));
+ brelse(bh);
+ mutex_unlock(&sdp->sd_inum_mutex);
+ gfs2_trans_end(sdp);
+ return 0;
+ }
+
+ brelse(bh);
+
+ mutex_unlock(&sdp->sd_inum_mutex);
+ gfs2_trans_end(sdp);
+
+ return 1;
+}
+
+static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino)
+{
+ struct gfs2_inode *ip = get_v2ip(sdp->sd_ir_inode);
+ struct gfs2_inode *m_ip = get_v2ip(sdp->sd_inum_inode);
+ struct gfs2_holder gh;
+ struct buffer_head *bh;
+ struct gfs2_inum_range ir;
+ int error;
+
+ error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
+ if (error)
+ return error;
+
+ error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
+ if (error)
+ goto out;
+ mutex_lock(&sdp->sd_inum_mutex);
+
+ error = gfs2_meta_inode_buffer(ip, &bh);
+ if (error)
+ goto out_end_trans;
+
+ gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
+
+ if (!ir.ir_length) {
+ struct buffer_head *m_bh;
+ uint64_t x, y;
+
+ error = gfs2_meta_inode_buffer(m_ip, &m_bh);
+ if (error)
+ goto out_brelse;
+
+ x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode));
+ x = y = be64_to_cpu(x);
+ ir.ir_start = x;
+ ir.ir_length = GFS2_INUM_QUANTUM;
+ x += GFS2_INUM_QUANTUM;
+ if (x < y)
+ gfs2_consist_inode(m_ip);
+ x = cpu_to_be64(x);
+ gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
+ *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x;
+
+ brelse(m_bh);
+ }
+
+ *formal_ino = ir.ir_start++;
+ ir.ir_length--;
+
+ gfs2_trans_add_bh(ip->i_gl, bh, 1);
+ gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
+
+ out_brelse:
+ brelse(bh);
+
+ out_end_trans:
+ mutex_unlock(&sdp->sd_inum_mutex);
+ gfs2_trans_end(sdp);
+
+ out:
+ gfs2_glock_dq_uninit(&gh);
+
+ return error;
+}
+
+static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum)
+{
+ int error;
+
+ error = pick_formal_ino_1(sdp, inum);
+ if (error <= 0)
+ return error;
+
+ error = pick_formal_ino_2(sdp, inum);
+
+ return 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, struct qstr *name,
+ unsigned int mode)
+{
+ int error;
+
+ error = gfs2_repermission(dip->i_vnode, MAY_WRITE | MAY_EXEC, NULL);
+ if (error)
+ return error;
+
+ /* Don't create entries in an unlinked directory */
+ if (!dip->i_di.di_nlink)
+ return -EPERM;
+
+ error = gfs2_dir_search(dip, name, NULL, NULL);
+ switch (error) {
+ case -ENOENT:
+ error = 0;
+ break;
+ case 0:
+ return -EEXIST;
+ default:
+ return error;
+ }
+
+ if (dip->i_di.di_entries == (uint32_t)-1)
+ return -EFBIG;
+ if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-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 (dip->i_sbd->sd_args.ar_suiddir &&
+ (dip->i_di.di_mode & S_ISUID) &&
+ dip->i_di.di_uid) {
+ if (S_ISDIR(*mode))
+ *mode |= S_ISUID;
+ else if (dip->i_di.di_uid != current->fsuid)
+ *mode &= ~07111;
+ *uid = dip->i_di.di_uid;
+ } else
+ *uid = current->fsuid;
+
+ if (dip->i_di.di_mode & S_ISGID) {
+ if (S_ISDIR(*mode))
+ *mode |= S_ISGID;
+ *gid = dip->i_di.di_gid;
+ } else
+ *gid = current->fsgid;
+}
+
+static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_unlinked *ul)
+{
+ struct gfs2_sbd *sdp = dip->i_sbd;
+ int error;
+
+ gfs2_alloc_get(dip);
+
+ 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_UNLINKED +
+ RES_STATFS, 0);
+ if (error)
+ goto out_ipreserv;
+
+ ul->ul_ut.ut_inum.no_addr = gfs2_alloc_di(dip);
+
+ ul->ul_ut.ut_flags = GFS2_UTF_UNINIT;
+ error = gfs2_unlinked_ondisk_add(sdp, ul);
+
+ 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,
+ struct gfs2_inum *inum, unsigned int mode,
+ unsigned int uid, unsigned int gid)
+{
+ struct gfs2_sbd *sdp = dip->i_sbd;
+ struct gfs2_dinode *di;
+ struct buffer_head *dibh;
+
+ 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 = cpu_to_be32(0);
+ di->di_size = cpu_to_be64(0);
+ di->di_blocks = cpu_to_be64(1);
+ di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
+ di->di_major = di->di_minor = cpu_to_be32(0);
+ di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
+ di->__pad[0] = di->__pad[1] = 0;
+ di->di_flags = cpu_to_be32(0);
+
+ if (S_ISREG(mode)) {
+ if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
+ gfs2_tune_get(sdp, gt_new_files_jdata))
+ di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
+ if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
+ gfs2_tune_get(sdp, gt_new_files_directio))
+ di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
+ } else if (S_ISDIR(mode)) {
+ di->di_flags |= cpu_to_be32(dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO);
+ di->di_flags |= cpu_to_be32(dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA);
+ }
+
+ di->__pad1 = 0;
+ di->di_height = cpu_to_be32(0);
+ di->__pad2 = 0;
+ di->__pad3 = 0;
+ di->di_depth = cpu_to_be16(0);
+ di->di_entries = cpu_to_be32(0);
+ memset(&di->__pad4, 0, sizeof(di->__pad4));
+ di->di_eattr = cpu_to_be64(0);
+ memset(&di->di_reserved, 0, sizeof(di->di_reserved));
+
+ brelse(dibh);
+}
+
+static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
+ unsigned int mode, struct gfs2_unlinked *ul)
+{
+ struct gfs2_sbd *sdp = dip->i_sbd;
+ unsigned int uid, gid;
+ int error;
+
+ munge_mode_uid_gid(dip, &mode, &uid, &gid);
+
+ gfs2_alloc_get(dip);
+
+ 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_UNLINKED +
+ RES_QUOTA, 0);
+ if (error)
+ goto out_quota;
+
+ ul->ul_ut.ut_flags = 0;
+ error = gfs2_unlinked_ondisk_munge(sdp, ul);
+
+ init_dinode(dip, gl, &ul->ul_ut.ut_inum,
+ mode, uid, gid);
+
+ 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, struct qstr *name,
+ struct gfs2_inode *ip, struct gfs2_unlinked *ul)
+{
+ struct gfs2_sbd *sdp = dip->i_sbd;
+ struct gfs2_alloc *al;
+ int alloc_required;
+ struct buffer_head *dibh;
+ int error;
+
+ al = gfs2_alloc_get(dip);
+
+ error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+ if (error)
+ goto fail;
+
+ error = gfs2_diradd_alloc_required(dip, name, &alloc_required);
+ if (alloc_required) {
+ error = gfs2_quota_check(dip, dip->i_di.di_uid,
+ dip->i_di.di_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_ri.ri_length +
+ 2 * RES_DINODE + RES_UNLINKED +
+ RES_STATFS + RES_QUOTA, 0);
+ if (error)
+ goto fail_ipreserv;
+ } else {
+ error = gfs2_trans_begin(sdp,
+ RES_LEAF +
+ 2 * RES_DINODE +
+ RES_UNLINKED, 0);
+ if (error)
+ goto fail_quota_locks;
+ }
+
+ error = gfs2_dir_add(dip, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
+ if (error)
+ goto fail_end_trans;
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto fail_end_trans;
+ ip->i_di.di_nlink = 1;
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
+
+ error = gfs2_unlinked_ondisk_rm(sdp, ul);
+ if (error)
+ goto fail_end_trans;
+
+ 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;
+}
+
+/**
+ * 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, struct qstr *name, unsigned int mode)
+{
+ struct inode *inode;
+ struct gfs2_inode *dip = get_gl2ip(ghs->gh_gl);
+ struct gfs2_sbd *sdp = dip->i_sbd;
+ struct gfs2_unlinked *ul;
+ struct gfs2_inode *ip;
+ int error;
+
+ if (!name->len || name->len > GFS2_FNAMESIZE)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ error = gfs2_unlinked_get(sdp, &ul);
+ if (error)
+ return ERR_PTR(error);
+
+ 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 = pick_formal_ino(sdp, &ul->ul_ut.ut_inum.no_formal_ino);
+ if (error)
+ goto fail_gunlock;
+
+ error = alloc_dinode(dip, ul);
+ if (error)
+ goto fail_gunlock;
+
+ if (ul->ul_ut.ut_inum.no_addr < dip->i_num.no_addr) {
+ gfs2_glock_dq(ghs);
+
+ error = gfs2_glock_nq_num(sdp,
+ ul->ul_ut.ut_inum.no_addr,
+ &gfs2_inode_glops,
+ LM_ST_EXCLUSIVE, GL_SKIP,
+ ghs + 1);
+ if (error) {
+ gfs2_unlinked_put(sdp, ul);
+ return ERR_PTR(error);
+ }
+
+ gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
+ error = gfs2_glock_nq(ghs);
+ if (error) {
+ gfs2_glock_dq_uninit(ghs + 1);
+ gfs2_unlinked_put(sdp, ul);
+ return ERR_PTR(error);
+ }
+
+ error = create_ok(dip, name, mode);
+ if (error)
+ goto fail_gunlock2;
+ } else {
+ error = gfs2_glock_nq_num(sdp,
+ ul->ul_ut.ut_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, ul);
+ if (error)
+ goto fail_gunlock2;
+
+ error = gfs2_inode_get(ghs[1].gh_gl, &ul->ul_ut.ut_inum, CREATE, &ip);
+ if (error)
+ goto fail_gunlock2;
+
+ error = gfs2_inode_refresh(ip);
+ if (error)
+ goto fail_iput;
+
+ error = gfs2_acl_create(dip, ip);
+ if (error)
+ goto fail_iput;
+
+ error = link_dinode(dip, name, ip, ul);
+ if (error)
+ goto fail_iput;
+
+ gfs2_unlinked_put(sdp, ul);
+
+ inode = gfs2_ip2v(ip);
+ gfs2_inode_put(ip);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ return inode;
+
+ fail_iput:
+ gfs2_inode_put(ip);
+
+ fail_gunlock2:
+ gfs2_glock_dq_uninit(ghs + 1);
+
+ fail_gunlock:
+ gfs2_glock_dq(ghs);
+
+ fail:
+ gfs2_unlinked_put(sdp, ul);
+
+ return ERR_PTR(error);
+}
+
+/**
+ * gfs2_unlinki - Unlink a file
+ * @dip: The inode of the directory
+ * @name: The name of the file to be unlinked
+ * @ip: The inode of the file to be removed
+ *
+ * Assumes Glocks on both dip and ip are held.
+ *
+ * Returns: errno
+ */
+
+int gfs2_unlinki(struct gfs2_inode *dip, struct qstr *name,
+ struct gfs2_inode *ip, struct gfs2_unlinked *ul)
+{
+ struct gfs2_sbd *sdp = dip->i_sbd;
+ int error;
+
+ error = gfs2_dir_del(dip, name);
+ if (error)
+ return error;
+
+ error = gfs2_change_nlink(ip, -1);
+ if (error)
+ return error;
+
+ /* If this inode is being unlinked from the directory structure,
+ we need to mark that in the log so that it isn't lost during
+ a crash. */
+
+ if (!ip->i_di.di_nlink) {
+ ul->ul_ut.ut_inum = ip->i_num;
+ error = gfs2_unlinked_ondisk_add(sdp, ul);
+ if (!error)
+ set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
+ }
+
+ return error;
+}
+
+/**
+ * gfs2_rmdiri - Remove a directory
+ * @dip: The parent directory of the directory to be removed
+ * @name: The name of the directory to be removed
+ * @ip: The GFS2 inode of the directory to be removed
+ *
+ * Assumes Glocks on dip and ip are held
+ *
+ * Returns: errno
+ */
+
+int gfs2_rmdiri(struct gfs2_inode *dip, struct qstr *name,
+ struct gfs2_inode *ip, struct gfs2_unlinked *ul)
+{
+ struct gfs2_sbd *sdp = dip->i_sbd;
+ struct qstr dotname;
+ int error;
+
+ if (ip->i_di.di_entries != 2) {
+ if (gfs2_consist_inode(ip))
+ gfs2_dinode_print(&ip->i_di);
+ return -EIO;
+ }
+
+ error = gfs2_dir_del(dip, name);
+ if (error)
+ return error;
+
+ error = gfs2_change_nlink(dip, -1);
+ if (error)
+ return error;
+
+ dotname.len = 1;
+ dotname.name = ".";
+ error = gfs2_dir_del(ip, &dotname);
+ if (error)
+ return error;
+
+ dotname.len = 2;
+ dotname.name = "..";
+ error = gfs2_dir_del(ip, &dotname);
+ if (error)
+ return error;
+
+ error = gfs2_change_nlink(ip, -2);
+ if (error)
+ return error;
+
+ /* This inode is being unlinked from the directory structure and
+ we need to mark that in the log so that it isn't lost during
+ a crash. */
+
+ ul->ul_ut.ut_inum = ip->i_num;
+ error = gfs2_unlinked_ondisk_add(sdp, ul);
+ if (!error)
+ set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
+
+ 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
+ */
+
+int gfs2_unlink_ok(struct gfs2_inode *dip, struct qstr *name,
+ struct gfs2_inode *ip)
+{
+ struct gfs2_inum inum;
+ unsigned int type;
+ int error;
+
+ if (IS_IMMUTABLE(ip->i_vnode) || IS_APPEND(ip->i_vnode))
+ return -EPERM;
+
+ if ((dip->i_di.di_mode & S_ISVTX) &&
+ dip->i_di.di_uid != current->fsuid &&
+ ip->i_di.di_uid != current->fsuid &&
+ !capable(CAP_FOWNER))
+ return -EPERM;
+
+ if (IS_APPEND(dip->i_vnode))
+ return -EPERM;
+
+ error = gfs2_repermission(dip->i_vnode, MAY_WRITE | MAY_EXEC, NULL);
+ if (error)
+ return error;
+
+ error = gfs2_dir_search(dip, name, &inum, &type);
+ if (error)
+ return error;
+
+ if (!gfs2_inum_equal(&inum, &ip->i_num))
+ return -ENOENT;
+
+ if (IF2DT(ip->i_di.di_mode) != type) {
+ gfs2_consist_inode(dip);
+ return -EIO;
+ }
+
+ 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
+ */
+
+int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
+{
+ struct gfs2_sbd *sdp = this->i_sbd;
+ struct inode *dir = to->i_vnode;
+ struct inode *tmp;
+ struct qstr dotdot;
+ int error = 0;
+
+ memset(&dotdot, 0, sizeof(struct qstr));
+ dotdot.name = "..";
+ dotdot.len = 2;
+
+ igrab(dir);
+
+ for (;;) {
+ if (dir == this->i_vnode) {
+ error = -EINVAL;
+ break;
+ }
+ if (dir == sdp->sd_root_dir) {
+ error = 0;
+ break;
+ }
+
+ error = gfs2_lookupi(dir, &dotdot, 1, &tmp);
+ if (error)
+ break;
+
+ iput(dir);
+ dir = tmp;
+ }
+
+ iput(dir);
+
+ return error;
+}
+
+/**
+ * gfs2_readlinki - return the contents of a symlink
+ * @ip: the symlink's inode
+ * @buf: a pointer to the buffer to be filled
+ * @len: a pointer to the length of @buf
+ *
+ * If @buf is too small, a piece of memory is kmalloc()ed and needs
+ * to be freed by the caller.
+ *
+ * Returns: errno
+ */
+
+int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
+{
+ struct gfs2_holder i_gh;
+ struct buffer_head *dibh;
+ unsigned int x;
+ int error;
+
+ gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
+ error = gfs2_glock_nq_atime(&i_gh);
+ if (error) {
+ gfs2_holder_uninit(&i_gh);
+ return error;
+ }
+
+ if (!ip->i_di.di_size) {
+ gfs2_consist_inode(ip);
+ error = -EIO;
+ goto out;
+ }
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto out;
+
+ x = ip->i_di.di_size + 1;
+ if (x > *len) {
+ *buf = kmalloc(x, GFP_KERNEL);
+ if (!*buf) {
+ error = -ENOMEM;
+ goto out_brelse;
+ }
+ }
+
+ memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
+ *len = x;
+
+ out_brelse:
+ brelse(dibh);
+
+ out:
+ gfs2_glock_dq_uninit(&i_gh);
+
+ return error;
+}
+
+/**
+ * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
+ * conditionally update the inode's atime
+ * @gh: the holder to acquire
+ *
+ * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
+ * Update if the difference between the current time and the inode's current
+ * atime is greater than an interval specified at mount.
+ *
+ * Returns: errno
+ */
+
+int gfs2_glock_nq_atime(struct gfs2_holder *gh)
+{
+ struct gfs2_glock *gl = gh->gh_gl;
+ struct gfs2_sbd *sdp = gl->gl_sbd;
+ struct gfs2_inode *ip = get_gl2ip(gl);
+ int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
+ unsigned int state;
+ int flags;
+ int error;
+
+ if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
+ gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
+ gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
+ return -EINVAL;
+
+ state = gh->gh_state;
+ flags = gh->gh_flags;
+
+ error = gfs2_glock_nq(gh);
+ if (error)
+ return error;
+
+ if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
+ (sdp->sd_vfs->s_flags & MS_RDONLY))
+ return 0;
+
+ curtime = get_seconds();
+ if (curtime - ip->i_di.di_atime >= quantum) {
+ gfs2_glock_dq(gh);
+ gfs2_holder_reinit(LM_ST_EXCLUSIVE,
+ gh->gh_flags & ~LM_FLAG_ANY,
+ gh);
+ error = gfs2_glock_nq(gh);
+ if (error)
+ return error;
+
+ /* Verify that atime hasn't been updated while we were
+ trying to get exclusive lock. */
+
+ curtime = get_seconds();
+ if (curtime - ip->i_di.di_atime >= quantum) {
+ struct buffer_head *dibh;
+
+ error = gfs2_trans_begin(sdp, RES_DINODE, 0);
+ if (error == -EROFS)
+ return 0;
+ if (error)
+ goto fail;
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto fail_end_trans;
+
+ ip->i_di.di_atime = curtime;
+
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
+
+ gfs2_trans_end(sdp);
+ }
+
+ /* If someone else has asked for the glock,
+ unlock and let them have it. Then reacquire
+ in the original state. */
+ if (gfs2_glock_is_blocking(gl)) {
+ gfs2_glock_dq(gh);
+ gfs2_holder_reinit(state, flags, gh);
+ return gfs2_glock_nq(gh);
+ }
+ }
+
+ return 0;
+
+ fail_end_trans:
+ gfs2_trans_end(sdp);
+
+ fail:
+ gfs2_glock_dq(gh);
+
+ return error;
+}
+
+/**
+ * glock_compare_atime - Compare two struct gfs2_glock structures for sort
+ * @arg_a: the first structure
+ * @arg_b: the second structure
+ *
+ * Returns: 1 if A > B
+ * -1 if A < B
+ * 0 if A = B
+ */
+
+static int glock_compare_atime(const void *arg_a, const void *arg_b)
+{
+ struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a;
+ struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b;
+ struct lm_lockname *a = &gh_a->gh_gl->gl_name;
+ struct lm_lockname *b = &gh_b->gh_gl->gl_name;
+ int ret = 0;
+
+ if (a->ln_number > b->ln_number)
+ ret = 1;
+ else if (a->ln_number < b->ln_number)
+ ret = -1;
+ else {
+ if (gh_a->gh_state == LM_ST_SHARED &&
+ gh_b->gh_state == LM_ST_EXCLUSIVE)
+ ret = 1;
+ else if (gh_a->gh_state == LM_ST_SHARED &&
+ (gh_b->gh_flags & GL_ATIME))
+ ret = 1;
+ }
+
+ return ret;
+}
+
+/**
+ * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
+ * atime update
+ * @num_gh: the number of structures
+ * @ghs: an array of struct gfs2_holder structures
+ *
+ * Returns: 0 on success (all glocks acquired),
+ * errno on failure (no glocks acquired)
+ */
+
+int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
+{
+ struct gfs2_holder **p;
+ unsigned int x;
+ int error = 0;
+
+ if (!num_gh)
+ return 0;
+
+ if (num_gh == 1) {
+ ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
+ if (ghs->gh_flags & GL_ATIME)
+ error = gfs2_glock_nq_atime(ghs);
+ else
+ error = gfs2_glock_nq(ghs);
+ return error;
+ }
+
+ p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ for (x = 0; x < num_gh; x++)
+ p[x] = &ghs[x];
+
+ sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
+
+ for (x = 0; x < num_gh; x++) {
+ p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
+
+ if (p[x]->gh_flags & GL_ATIME)
+ error = gfs2_glock_nq_atime(p[x]);
+ else
+ error = gfs2_glock_nq(p[x]);
+
+ if (error) {
+ while (x--)
+ gfs2_glock_dq(p[x]);
+ break;
+ }
+ }
+
+ kfree(p);
+
+ return error;
+}
+
+/**
+ * gfs2_try_toss_vnode - See if we can toss a vnode from memory
+ * @ip: the inode
+ *
+ * Returns: 1 if the vnode was tossed
+ */
+
+void gfs2_try_toss_vnode(struct gfs2_inode *ip)
+{
+ struct inode *inode;
+
+ inode = gfs2_ip2v_lookup(ip);
+ if (!inode)
+ return;
+
+ d_prune_aliases(inode);
+
+ if (S_ISDIR(ip->i_di.di_mode)) {
+ struct list_head *head = &inode->i_dentry;
+ struct dentry *d = NULL;
+
+ spin_lock(&dcache_lock);
+ if (list_empty(head))
+ spin_unlock(&dcache_lock);
+ else {
+ d = list_entry(head->next, struct dentry, d_alias);
+ dget_locked(d);
+ spin_unlock(&dcache_lock);
+
+ if (have_submounts(d))
+ dput(d);
+ else {
+ shrink_dcache_parent(d);
+ dput(d);
+ d_prune_aliases(inode);
+ }
+ }
+ }
+
+ inode->i_nlink = 0;
+ iput(inode);
+}
+
+
+static int
+__gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
+{
+ struct buffer_head *dibh;
+ int error;
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (!error) {
+ error = inode_setattr(ip->i_vnode, attr);
+ gfs2_assert_warn(ip->i_sbd, !error);
+ gfs2_inode_attr_out(ip);
+
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
+ }
+ return error;
+}
+
+/**
+ * gfs2_setattr_simple -
+ * @ip:
+ * @attr:
+ *
+ * Called with a reference on the vnode.
+ *
+ * Returns: errno
+ */
+
+int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
+{
+ int error;
+
+ if (get_transaction)
+ return __gfs2_setattr_simple(ip, attr);
+
+ error = gfs2_trans_begin(ip->i_sbd, RES_DINODE, 0);
+ if (error)
+ return error;
+
+ error = __gfs2_setattr_simple(ip, attr);
+
+ gfs2_trans_end(ip->i_sbd);
+
+ return error;
+}
+
+int gfs2_repermission(struct inode *inode, int mask, struct nameidata *nd)
+{
+ return permission(inode, mask, nd);
+}
+
--- /dev/null
+++ b/fs/gfs2/inode.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2005 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 v.2.
+ */
+
+#ifndef __INODE_DOT_H__
+#define __INODE_DOT_H__
+
+static inline int gfs2_is_stuffed(struct gfs2_inode *ip)
+{
+ return !ip->i_di.di_height;
+}
+
+static inline int gfs2_is_jdata(struct gfs2_inode *ip)
+{
+ return ip->i_di.di_flags & GFS2_DIF_JDATA;
+}
+
+static inline int gfs2_is_dir(struct gfs2_inode *ip)
+{
+ return S_ISDIR(ip->i_di.di_mode);
+}
+
+void gfs2_inode_attr_in(struct gfs2_inode *ip);
+void gfs2_inode_attr_out(struct gfs2_inode *ip);
+struct inode *gfs2_ip2v_lookup(struct gfs2_inode *ip);
+struct inode *gfs2_ip2v(struct gfs2_inode *ip);
+struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum);
+
+void gfs2_inode_min_init(struct gfs2_inode *ip, unsigned int type);
+int gfs2_inode_refresh(struct gfs2_inode *ip);
+
+int gfs2_inode_get(struct gfs2_glock *i_gl,
+ struct gfs2_inum *inum, int create,
+ struct gfs2_inode **ipp);
+void gfs2_inode_hold(struct gfs2_inode *ip);
+void gfs2_inode_put(struct gfs2_inode *ip);
+void gfs2_inode_destroy(struct gfs2_inode *ip);
+
+int gfs2_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul);
+
+int gfs2_change_nlink(struct gfs2_inode *ip, int diff);
+int gfs2_lookupi(struct inode *dir, struct qstr *name, int is_root,
+ struct inode **ipp);
+struct inode *gfs2_createi(struct gfs2_holder *ghs, struct qstr *name, unsigned int mode);
+int gfs2_unlinki(struct gfs2_inode *dip, struct qstr *name,
+ struct gfs2_inode *ip, struct gfs2_unlinked *ul);
+int gfs2_rmdiri(struct gfs2_inode *dip, struct qstr *name,
+ struct gfs2_inode *ip, struct gfs2_unlinked *ul);
+int gfs2_unlink_ok(struct gfs2_inode *dip, struct qstr *name,
+ struct gfs2_inode *ip);
+int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to);
+int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len);
+
+int gfs2_glock_nq_atime(struct gfs2_holder *gh);
+int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs);
+
+void gfs2_try_toss_vnode(struct gfs2_inode *ip);
+
+int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr);
+
+int gfs2_repermission(struct inode *inode, int mask, struct nameidata *nd);
+
+static inline int gfs2_lookup_simple(struct inode *dip, char *name,
+ struct inode **ipp)
+{
+ struct qstr qstr;
+ int err;
+ memset(&qstr, 0, sizeof(struct qstr));
+ qstr.name = name;
+ qstr.len = strlen(name);
+ err = gfs2_lookupi(dip, &qstr, 1, ipp);
+ return err;
+}
+
+#endif /* __INODE_DOT_H__ */
+
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