/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
- * Copyright (C) 2004-2005 Red Hat, Inc. 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 v.2.
+ * of the GNU General Public License version 2.
*/
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
-#include <asm/semaphore.h>
+#include <linux/gfs2_ondisk.h>
+#include <linux/crc32.h>
#include "gfs2.h"
+#include "lm_interface.h"
+#include "incore.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"
+#include "util.h"
+#include "ops_address.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
};
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,
+ struct buffer_head *bh, u64 *top,
+ u64 *bottom, unsigned int height,
void *data);
struct strip_mine {
};
/**
- * @gfs2_unstuffer_sync - Synchronously unstuff a dinode
- * @ip:
- * @dibh:
- * @block:
- * @private:
- *
- * Cheat and use a metadata buffer instead of a data page.
+ * gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page
+ * @ip: the inode
+ * @dibh: the dinode buffer
+ * @block: the block number that was allocated
+ * @private: any locked page held by the caller process
*
* Returns: errno
*/
-int gfs2_unstuffer_sync(struct gfs2_inode *ip, struct buffer_head *dibh,
- uint64_t block, void *private)
+static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
+ u64 block, struct page *page)
{
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+ struct inode *inode = &ip->i_inode;
struct buffer_head *bh;
- int error;
+ int release = 0;
+
+ if (!page || page->index) {
+ page = grab_cache_page(inode->i_mapping, 0);
+ if (!page)
+ return -ENOMEM;
+ release = 1;
+ }
- bh = gfs2_meta_new(ip->i_gl, block);
+ if (!PageUptodate(page)) {
+ void *kaddr = kmap(page);
- gfs2_buffer_copy_tail(bh, 0, dibh, sizeof(struct gfs2_dinode));
+ memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode),
+ ip->i_di.di_size);
+ memset(kaddr + ip->i_di.di_size, 0,
+ PAGE_CACHE_SIZE - ip->i_di.di_size);
+ kunmap(page);
- set_buffer_dirty(bh);
- error = sync_dirty_buffer(bh);
+ SetPageUptodate(page);
+ }
- brelse(bh);
+ if (!page_has_buffers(page))
+ create_empty_buffers(page, 1 << inode->i_blkbits,
+ (1 << BH_Uptodate));
- return error;
+ bh = page_buffers(page);
+
+ if (!buffer_mapped(bh))
+ map_bh(bh, inode->i_sb, block);
+
+ set_buffer_uptodate(bh);
+ if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip))
+ gfs2_trans_add_bh(ip->i_gl, bh, 0);
+ mark_buffer_dirty(bh);
+
+ if (release) {
+ unlock_page(page);
+ page_cache_release(page);
+ }
+
+ return 0;
}
/**
* Returns: errno
*/
-int gfs2_unstuff_dinode(struct gfs2_inode *ip, gfs2_unstuffer_t unstuffer,
- void *private)
+int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
{
struct buffer_head *bh, *dibh;
- uint64_t block = 0;
+ u64 block = 0;
int isdir = gfs2_is_dir(ip);
int error;
if (isdir) {
block = gfs2_alloc_meta(ip);
- error = gfs2_dir_get_buffer(ip, block, 1, &bh);
+ error = gfs2_dir_get_new_buffer(ip, block, &bh);
if (error)
goto out_brelse;
gfs2_buffer_copy_tail(bh,
} else {
block = gfs2_alloc_data(ip);
- error = unstuffer(ip, dibh, block, private);
+ error = gfs2_unstuffer_page(ip, dibh, block, page);
if (error)
goto out_brelse;
}
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);
+ *(u64 *)(dibh->b_data + sizeof(struct gfs2_dinode)) =
+ cpu_to_be64(block);
ip->i_di.di_blocks++;
}
gfs2_dinode_out(&ip->i_di, dibh->b_data);
- out_brelse:
+out_brelse:
brelse(dibh);
-
- out:
+out:
up_write(&ip->i_rw_mutex);
-
return error;
}
* Returns: the height the tree should be
*/
-static unsigned int calc_tree_height(struct gfs2_inode *ip, uint64_t size)
+static unsigned int calc_tree_height(struct gfs2_inode *ip, u64 size)
{
- struct gfs2_sbd *sdp = ip->i_sbd;
- uint64_t *arr;
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+ u64 *arr;
unsigned int max, height;
if (ip->i_di.di_size > size)
* @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)
+static int build_height(struct inode *inode, unsigned height)
{
- struct gfs2_sbd *sdp = ip->i_sbd;
- struct buffer_head *bh, *dibh;
- uint64_t block = 0, *bp;
- unsigned int x;
- int new_block;
+ struct gfs2_inode *ip = GFS2_I(inode);
+ unsigned new_height = height - ip->i_di.di_height;
+ struct buffer_head *dibh;
+ struct buffer_head *blocks[GFS2_MAX_META_HEIGHT];
int error;
+ u64 *bp;
+ u64 bn;
+ unsigned n;
- 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 */
+ if (height <= ip->i_di.di_height)
+ return 0;
- block = gfs2_alloc_meta(ip);
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ return error;
- bh = gfs2_meta_new(ip->i_gl, block);
- gfs2_trans_add_bh(ip->i_gl, bh, 1);
- gfs2_metatype_set(bh,
- GFS2_METATYPE_IN,
+ for(n = 0; n < new_height; n++) {
+ bn = gfs2_alloc_meta(ip);
+ blocks[n] = gfs2_meta_new(ip->i_gl, bn);
+ gfs2_trans_add_bh(ip->i_gl, blocks[n], 1);
+ }
+
+ n = 0;
+ bn = blocks[0]->b_blocknr;
+ if (new_height > 1) {
+ for(; n < new_height-1; n++) {
+ gfs2_metatype_set(blocks[n], GFS2_METATYPE_IN,
GFS2_FORMAT_IN);
- gfs2_buffer_copy_tail(bh,
- sizeof(struct gfs2_meta_header),
- dibh, sizeof(struct gfs2_dinode));
-
- brelse(bh);
+ gfs2_buffer_clear_tail(blocks[n],
+ sizeof(struct gfs2_meta_header));
+ bp = (u64 *)(blocks[n]->b_data +
+ sizeof(struct gfs2_meta_header));
+ *bp = cpu_to_be64(blocks[n+1]->b_blocknr);
+ brelse(blocks[n]);
+ blocks[n] = NULL;
}
-
- /* 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;
+ gfs2_metatype_set(blocks[n], GFS2_METATYPE_IN, GFS2_FORMAT_IN);
+ gfs2_buffer_copy_tail(blocks[n], sizeof(struct gfs2_meta_header),
+ dibh, sizeof(struct gfs2_dinode));
+ brelse(blocks[n]);
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
+ bp = (u64 *)(dibh->b_data + sizeof(struct gfs2_dinode));
+ *bp = cpu_to_be64(bn);
+ ip->i_di.di_height += new_height;
+ ip->i_di.di_blocks += new_height;
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
+ return error;
}
/**
*
*/
-static void find_metapath(struct gfs2_inode *ip, uint64_t block, struct metapath *mp)
+static void find_metapath(struct gfs2_inode *ip, u64 block,
+ struct metapath *mp)
{
- struct gfs2_sbd *sdp = ip->i_sbd;
- uint64_t b = block;
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+ u64 b = block;
unsigned int i;
for (i = ip->i_di.di_height; i--;)
- mp->mp_list[i] = (__u16)do_div(b, sdp->sd_inptrs);
+ mp->mp_list[i] = do_div(b, sdp->sd_inptrs);
}
* metadata tree.
*/
-static inline uint64_t *metapointer(struct buffer_head *bh,
- unsigned int height, struct metapath *mp)
+static inline u64 *metapointer(struct buffer_head *bh, int *boundary,
+ unsigned int height, const 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];
+ u64 *ptr;
+ *boundary = 0;
+ ptr = ((u64 *)(bh->b_data + head_size)) + mp->mp_list[height];
+ if (ptr + 1 == (u64 *)(bh->b_data + bh->b_size))
+ *boundary = 1;
+ return ptr;
}
/**
*
*/
-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)
+static int lookup_block(struct gfs2_inode *ip, struct buffer_head *bh,
+ unsigned int height, struct metapath *mp, int create,
+ int *new, u64 *block)
{
- uint64_t *ptr = metapointer(bh, height, mp);
+ int boundary;
+ u64 *ptr = metapointer(bh, &boundary, height, mp);
if (*ptr) {
*block = be64_to_cpu(*ptr);
- return;
+ return boundary;
}
*block = 0;
if (!create)
- return;
+ return 0;
- if (height == ip->i_di.di_height - 1 &&
- !gfs2_is_dir(ip))
+ if (height == ip->i_di.di_height - 1 && !gfs2_is_dir(ip))
*block = gfs2_alloc_data(ip);
else
*block = gfs2_alloc_meta(ip);
ip->i_di.di_blocks++;
*new = 1;
+ return 0;
}
/**
- * gfs2_block_map - Map a block from an inode to a disk block
- * @ip: The GFS2 inode
+ * gfs2_block_pointers - Map a block from an inode to a disk block
+ * @inode: The 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
+ * @map_bh: The bh to be mapped
+ * @mp: metapath to use
*
* 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)
+static int gfs2_block_pointers(struct inode *inode, u64 lblock, int create,
+ struct buffer_head *bh_map, struct metapath *mp,
+ unsigned int maxlen)
{
- struct gfs2_sbd *sdp = ip->i_sbd;
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
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);
+ int new = 0;
+ u64 dblock = 0;
+ int boundary;
if (gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip)))
- goto out;
+ return 0;
- bsize = (gfs2_is_dir(ip)) ? sdp->sd_jbsize : sdp->sd_sb.sb_bsize;
+ 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;
+ return 0;
- error = build_height(ip, height);
+ error = build_height(inode, height);
if (error)
- goto out;
+ return error;
}
- find_metapath(ip, lblock, &mp);
+ 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;
+ return error;
for (x = 0; x < end_of_metadata; x++) {
- lookup_block(ip, bh, x, &mp, create, new, dblock);
+ lookup_block(ip, bh, x, mp, create, &new, &dblock);
brelse(bh);
- if (!*dblock)
- goto out;
+ if (!dblock)
+ return 0;
- error = gfs2_meta_indirect_buffer(ip, x+1, *dblock, *new, &bh);
+ error = gfs2_meta_indirect_buffer(ip, x+1, dblock, new, &bh);
if (error)
- goto out;
+ return error;
}
- 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)++;
+ boundary = lookup_block(ip, bh, end_of_metadata, mp, create, &new, &dblock);
+ clear_buffer_mapped(bh_map);
+ clear_buffer_new(bh_map);
+ clear_buffer_boundary(bh_map);
+
+ if (dblock) {
+ map_bh(bh_map, inode->i_sb, dblock);
+ if (boundary)
+ set_buffer_boundary(bh);
+ if (new) {
+ struct buffer_head *dibh;
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (!error) {
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
}
+ set_buffer_new(bh_map);
+ goto out_brelse;
}
- }
+ while(--maxlen && !buffer_boundary(bh_map)) {
+ u64 eblock;
- 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);
+ mp->mp_list[end_of_metadata]++;
+ boundary = lookup_block(ip, bh, end_of_metadata, mp, 0, &new, &eblock);
+ if (eblock != ++dblock)
+ break;
+ bh_map->b_size += (1 << inode->i_blkbits);
+ if (boundary)
+ set_buffer_boundary(bh_map);
}
}
+out_brelse:
+ brelse(bh);
+ return 0;
+}
- out:
+
+static inline void bmap_lock(struct inode *inode, int create)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ if (create)
+ down_write(&ip->i_rw_mutex);
+ else
+ down_read(&ip->i_rw_mutex);
+}
+
+static inline void bmap_unlock(struct inode *inode, int create)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
if (create)
up_write(&ip->i_rw_mutex);
else
up_read(&ip->i_rw_mutex);
+}
- return error;
+int gfs2_block_map(struct inode *inode, u64 lblock, int create,
+ struct buffer_head *bh, unsigned int maxlen)
+{
+ struct metapath mp;
+ int ret;
+
+ bmap_lock(inode, create);
+ ret = gfs2_block_pointers(inode, lblock, create, bh, &mp, maxlen);
+ bmap_unlock(inode, create);
+ return ret;
+}
+
+int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen)
+{
+ struct metapath mp;
+ struct buffer_head bh = { .b_state = 0, .b_blocknr = 0, .b_size = 0 };
+ int ret;
+ int create = *new;
+
+ BUG_ON(!extlen);
+ BUG_ON(!dblock);
+ BUG_ON(!new);
+
+ bmap_lock(inode, create);
+ ret = gfs2_block_pointers(inode, lblock, create, &bh, &mp, *extlen);
+ bmap_unlock(inode, create);
+ *extlen = bh.b_size >> inode->i_blkbits;
+ *dblock = bh.b_blocknr;
+ if (buffer_new(&bh))
+ *new = 1;
+ else
+ *new = 0;
+ return ret;
}
/**
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,
+ u64 block, int first, block_call_t bc,
void *data)
{
- struct gfs2_sbd *sdp = ip->i_sbd;
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct buffer_head *bh = NULL;
- uint64_t *top, *bottom;
- uint64_t bn;
+ u64 *top, *bottom;
+ u64 bn;
int error;
int mh_size = sizeof(struct gfs2_meta_header);
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;
+ top = (u64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + mp->mp_list[0];
+ bottom = (u64 *)(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);
+ top = (u64 *)(bh->b_data + mh_size) +
+ (first ? mp->mp_list[height] : 0);
- bottom = (uint64_t *)(bh->b_data + mh_size) + sdp->sd_inptrs;
+ bottom = (u64 *)(bh->b_data + mh_size) + sdp->sd_inptrs;
}
error = bc(ip, dibh, bh, top, bottom, height, data);
break;
}
- out:
+out:
brelse(bh);
-
return error;
}
*/
static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
- struct buffer_head *bh, uint64_t *top, uint64_t *bottom,
+ struct buffer_head *bh, u64 *top, u64 *bottom,
unsigned int height, void *data)
{
- struct strip_mine *sm = (struct strip_mine *)data;
- struct gfs2_sbd *sdp = ip->i_sbd;
+ struct strip_mine *sm = data;
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct gfs2_rgrp_list rlist;
- uint64_t bn, bstart;
- uint32_t blen;
- uint64_t *p;
+ u64 bn, bstart;
+ u32 blen;
+ u64 *p;
unsigned int rg_blocks = 0;
int metadata;
unsigned int revokes = 0;
for (x = 0; x < rlist.rl_rgrps; x++) {
struct gfs2_rgrpd *rgd;
- rgd = get_gl2rgd(rlist.rl_ghs[x].gh_gl);
+ rgd = rlist.rl_ghs[x].gh_gl->gl_object;
rg_blocks += rgd->rd_ri.ri_length;
}
gfs2_trans_end(sdp);
- out_rg_gunlock:
+out_rg_gunlock:
gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
-
- out_rlist:
+out_rlist:
gfs2_rlist_free(&rlist);
-
- out:
+out:
gfs2_glock_dq_uninit(&ip->i_alloc.al_ri_gh);
-
return error;
}
* Returns: errno
*/
-static int do_grow(struct gfs2_inode *ip, uint64_t size)
+static int do_grow(struct gfs2_inode *ip, u64 size)
{
- struct gfs2_sbd *sdp = ip->i_sbd;
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct gfs2_alloc *al;
struct buffer_head *dibh;
unsigned int h;
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);
+ error = gfs2_unstuff_dinode(ip, 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);
+ error = build_height(&ip->i_inode, h);
up_write(&ip->i_rw_mutex);
if (error)
goto out_end_trans;
gfs2_dinode_out(&ip->i_di, dibh->b_data);
brelse(dibh);
- out_end_trans:
+out_end_trans:
gfs2_trans_end(sdp);
-
- out_ipres:
+out_ipres:
gfs2_inplace_release(ip);
-
- out_gunlock_q:
+out_gunlock_q:
gfs2_quota_unlock(ip);
-
- out:
+out:
gfs2_alloc_put(ip);
-
return error;
}
-static int trunc_start(struct gfs2_inode *ip, uint64_t size)
+
+/**
+ * gfs2_block_truncate_page - Deal with zeroing out data for truncate
+ *
+ * This is partly borrowed from ext3.
+ */
+static int gfs2_block_truncate_page(struct address_space *mapping)
+{
+ struct inode *inode = mapping->host;
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ loff_t from = inode->i_size;
+ unsigned long index = from >> PAGE_CACHE_SHIFT;
+ unsigned offset = from & (PAGE_CACHE_SIZE-1);
+ unsigned blocksize, iblock, length, pos;
+ struct buffer_head *bh;
+ struct page *page;
+ void *kaddr;
+ int err;
+
+ page = grab_cache_page(mapping, index);
+ if (!page)
+ return 0;
+
+ blocksize = inode->i_sb->s_blocksize;
+ length = blocksize - (offset & (blocksize - 1));
+ iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
+
+ if (!page_has_buffers(page))
+ create_empty_buffers(page, blocksize, 0);
+
+ /* Find the buffer that contains "offset" */
+ bh = page_buffers(page);
+ pos = blocksize;
+ while (offset >= pos) {
+ bh = bh->b_this_page;
+ iblock++;
+ pos += blocksize;
+ }
+
+ err = 0;
+
+ if (!buffer_mapped(bh)) {
+ gfs2_get_block(inode, iblock, bh, 0);
+ /* unmapped? It's a hole - nothing to do */
+ if (!buffer_mapped(bh))
+ goto unlock;
+ }
+
+ /* Ok, it's mapped. Make sure it's up-to-date */
+ if (PageUptodate(page))
+ set_buffer_uptodate(bh);
+
+ if (!buffer_uptodate(bh)) {
+ err = -EIO;
+ ll_rw_block(READ, 1, &bh);
+ wait_on_buffer(bh);
+ /* Uhhuh. Read error. Complain and punt. */
+ if (!buffer_uptodate(bh))
+ goto unlock;
+ }
+
+ if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip))
+ gfs2_trans_add_bh(ip->i_gl, bh, 0);
+
+ kaddr = kmap_atomic(page, KM_USER0);
+ memset(kaddr + offset, 0, length);
+ flush_dcache_page(page);
+ kunmap_atomic(kaddr, KM_USER0);
+
+unlock:
+ unlock_page(page);
+ page_cache_release(page);
+ return err;
+}
+
+static int trunc_start(struct gfs2_inode *ip, u64 size)
{
- struct gfs2_sbd *sdp = ip->i_sbd;
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct buffer_head *dibh;
int journaled = gfs2_is_jdata(ip);
int error;
error = gfs2_trans_begin(sdp,
- RES_DINODE + ((journaled) ? RES_JDATA : 0), 0);
+ RES_DINODE + (journaled ? RES_JDATA : 0), 0);
if (error)
return error;
error = 1;
} else {
- if (size & (uint64_t)(sdp->sd_sb.sb_bsize - 1))
- error = gfs2_block_truncate_page(ip->i_vnode->i_mapping);
+ if (size & (u64)(sdp->sd_sb.sb_bsize - 1))
+ error = gfs2_block_truncate_page(ip->i_inode.i_mapping);
if (!error) {
ip->i_di.di_size = size;
brelse(dibh);
- out:
+out:
gfs2_trans_end(sdp);
-
return error;
}
-static int trunc_dealloc(struct gfs2_inode *ip, uint64_t size)
+static int trunc_dealloc(struct gfs2_inode *ip, u64 size)
{
unsigned int height = ip->i_di.di_height;
- uint64_t lblock;
+ u64 lblock;
struct metapath mp;
int error;
if (!size)
lblock = 0;
else
- lblock = (size - 1) >> ip->i_sbd->sd_sb.sb_bsize_shift;
+ lblock = (size - 1) >> GFS2_SB(&ip->i_inode)->sd_sb.sb_bsize_shift;
find_metapath(ip, lblock, &mp);
gfs2_alloc_get(ip);
gfs2_quota_unhold(ip);
- out:
+out:
gfs2_alloc_put(ip);
return error;
}
static int trunc_end(struct gfs2_inode *ip)
{
- struct gfs2_sbd *sdp = ip->i_sbd;
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
struct buffer_head *dibh;
int error;
gfs2_dinode_out(&ip->i_di, dibh->b_data);
brelse(dibh);
- out:
+out:
up_write(&ip->i_rw_mutex);
-
gfs2_trans_end(sdp);
-
return error;
}
* Returns: errno
*/
-static int do_shrink(struct gfs2_inode *ip, uint64_t size)
+static int do_shrink(struct gfs2_inode *ip, u64 size)
{
int error;
* Returns: errno
*/
-int gfs2_truncatei(struct gfs2_inode *ip, uint64_t size)
+int gfs2_truncatei(struct gfs2_inode *ip, u64 size)
{
int error;
- if (gfs2_assert_warn(ip->i_sbd, S_ISREG(ip->i_di.di_mode)))
+ if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), S_ISREG(ip->i_di.di_mode)))
return -EINVAL;
if (size > ip->i_di.di_size)
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;
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
unsigned int tmp;
if (gfs2_is_dir(ip)) {
- *data_blocks = DIV_RU(len, sdp->sd_jbsize) + 2;
+ *data_blocks = DIV_ROUND_UP(len, sdp->sd_jbsize) + 2;
*ind_blocks = 3 * (sdp->sd_max_jheight - 1);
} else {
*data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3;
}
for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) {
- tmp = DIV_RU(tmp, sdp->sd_inptrs);
+ tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
*ind_blocks += tmp;
}
}
* Returns: errno
*/
-int gfs2_write_alloc_required(struct gfs2_inode *ip, uint64_t offset,
+int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
unsigned int len, int *alloc_required)
{
- struct gfs2_sbd *sdp = ip->i_sbd;
- uint64_t lblock, lblock_stop, dblock;
- uint32_t extlen;
+ struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+ u64 lblock, lblock_stop, dblock;
+ u32 extlen;
int new = 0;
int error = 0;
}
for (; lblock < lblock_stop; lblock += extlen) {
- error = gfs2_block_map(ip, lblock, &new, &dblock, &extlen);
+ error = gfs2_extent_map(&ip->i_inode, lblock, &new, &dblock, &extlen);
if (error)
return error;
git.openpandora.org / pandora-kernel.git / blobdiff