#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/pagemap.h>
+#include <linux/mpage.h>
+#include <linux/fs.h>
#include <asm/semaphore.h>
#include "gfs2.h"
#include "bmap.h"
#include "glock.h"
#include "inode.h"
-#include "jdata.h"
#include "log.h"
#include "meta_io.h"
#include "ops_address.h"
#include "page.h"
#include "quota.h"
#include "trans.h"
+#include "rgrp.h"
+#include "ops_file.h"
/**
- * get_block - Fills in a buffer head with details about a block
+ * gfs2_get_block - Fills in a buffer head with details about a block
* @inode: The inode
* @lblock: The block number to look up
* @bh_result: The buffer head to return the result in
* Returns: errno
*/
-static int get_block(struct inode *inode, sector_t lblock,
- struct buffer_head *bh_result, int create)
+int gfs2_get_block(struct inode *inode, sector_t lblock,
+ struct buffer_head *bh_result, int create)
{
struct gfs2_inode *ip = get_v2ip(inode);
int new = create;
*
* Returns: errno
*
- * Use Linux VFS block_write_full_page() to write one page,
- * using GFS2's get_block_noalloc to find which blocks to write.
+ * Some of this is copied from block_write_full_page() although we still
+ * call it to do most of the work.
*/
static int gfs2_writepage(struct page *page, struct writeback_control *wbc)
{
+ struct inode *inode = page->mapping->host;
struct gfs2_inode *ip = get_v2ip(page->mapping->host);
struct gfs2_sbd *sdp = ip->i_sbd;
+ loff_t i_size = i_size_read(inode);
+ pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
+ unsigned offset;
int error;
+ int done_trans = 0;
atomic_inc(&sdp->sd_ops_address);
-
if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) {
unlock_page(page);
return -EIO;
}
- if (get_transaction) {
- redirty_page_for_writepage(wbc, page);
+ if (get_transaction)
+ goto out_ignore;
+
+ /* Is the page fully outside i_size? (truncate in progress) */
+ offset = i_size & (PAGE_CACHE_SIZE-1);
+ if (page->index >= end_index+1 || !offset) {
+ page->mapping->a_ops->invalidatepage(page, 0);
unlock_page(page);
- return 0;
+ return 0; /* don't care */
}
- error = block_write_full_page(page, get_block_noalloc, wbc);
+ if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) {
+ error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0);
+ if (error)
+ goto out_ignore;
+ gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1);
+ done_trans = 1;
+ }
+ error = block_write_full_page(page, get_block_noalloc, wbc);
+ if (done_trans)
+ gfs2_trans_end(sdp);
gfs2_meta_cache_flush(ip);
-
return error;
+
+out_ignore:
+ redirty_page_for_writepage(wbc, page);
+ unlock_page(page);
+ return 0;
}
/**
if (error)
return error;
- kaddr = kmap(page);
+ kaddr = kmap_atomic(page, KM_USER0);
memcpy((char *)kaddr,
dibh->b_data + sizeof(struct gfs2_dinode),
ip->i_di.di_size);
memset((char *)kaddr + ip->i_di.di_size,
0,
PAGE_CACHE_SIZE - ip->i_di.di_size);
- kunmap(page);
+ kunmap_atomic(page, KM_USER0);
brelse(dibh);
{
void *kaddr;
- kaddr = kmap(page);
+ kaddr = kmap_atomic(page, KM_USER0);
memset(kaddr, 0, PAGE_CACHE_SIZE);
- kunmap(page);
+ kunmap_atomic(page, KM_USER0);
SetPageUptodate(page);
unlock_page(page);
return 0;
}
-/**
- * jdata_readpage - readpage that goes through gfs2_jdata_read_mem()
- * @ip:
- * @page: The page to read
- *
- * Returns: errno
- */
-
-static int jdata_readpage(struct gfs2_inode *ip, struct page *page)
-{
- void *kaddr;
- int ret;
-
- kaddr = kmap(page);
-
- ret = gfs2_jdata_read_mem(ip, kaddr,
- (uint64_t)page->index << PAGE_CACHE_SHIFT,
- PAGE_CACHE_SIZE);
- if (ret >= 0) {
- if (ret < PAGE_CACHE_SIZE)
- memset(kaddr + ret, 0, PAGE_CACHE_SIZE - ret);
- SetPageUptodate(page);
- ret = 0;
- }
-
- kunmap(page);
-
- unlock_page(page);
-
- return ret;
-}
-
/**
* gfs2_readpage - readpage with locking
- * @file: The file to read a page for
+ * @file: The file to read a page for. N.B. This may be NULL if we are
+ * reading an internal file.
* @page: The page to read
*
* Returns: errno
{
struct gfs2_inode *ip = get_v2ip(page->mapping->host);
struct gfs2_sbd *sdp = ip->i_sbd;
+ struct gfs2_holder gh;
int error;
atomic_inc(&sdp->sd_ops_address);
- if (gfs2_assert_warn(sdp, gfs2_glock_is_locked_by_me(ip->i_gl))) {
- unlock_page(page);
- return -EOPNOTSUPP;
+ if (file != &gfs2_internal_file_sentinal) {
+ gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
+ error = gfs2_glock_nq_m_atime(1, &gh);
+ if (error)
+ goto out_unlock;
}
- if (!gfs2_is_jdata(ip)) {
- if (gfs2_is_stuffed(ip)) {
- if (!page->index) {
- error = stuffed_readpage(ip, page);
- unlock_page(page);
- } else
- error = zero_readpage(page);
+ if (gfs2_is_stuffed(ip)) {
+ if (!page->index) {
+ error = stuffed_readpage(ip, page);
+ unlock_page(page);
} else
- error = block_read_full_page(page, get_block);
+ error = zero_readpage(page);
} else
- error = jdata_readpage(ip, page);
+ error = mpage_readpage(page, gfs2_get_block);
if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
error = -EIO;
+ if (file != &gfs2_internal_file_sentinal) {
+ gfs2_glock_dq_m(1, &gh);
+ gfs2_holder_uninit(&gh);
+ }
+out:
return error;
+out_unlock:
+ unlock_page(page);
+ goto out;
}
/**
{
struct gfs2_inode *ip = get_v2ip(page->mapping->host);
struct gfs2_sbd *sdp = ip->i_sbd;
+ unsigned int data_blocks, ind_blocks, rblocks;
+ int alloc_required;
int error = 0;
+ loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + from;
+ loff_t end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
+ struct gfs2_alloc *al;
atomic_inc(&sdp->sd_ops_address);
- if (gfs2_assert_warn(sdp, gfs2_glock_is_locked_by_me(ip->i_gl)))
- return -EOPNOTSUPP;
+ gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME, &ip->i_gh);
+ error = gfs2_glock_nq_m_atime(1, &ip->i_gh);
+ if (error)
+ goto out_uninit;
- if (gfs2_is_stuffed(ip)) {
- uint64_t file_size;
- file_size = ((uint64_t)page->index << PAGE_CACHE_SHIFT) + to;
+ gfs2_write_calc_reserv(ip, to - from, &data_blocks, &ind_blocks);
+
+ error = gfs2_write_alloc_required(ip, pos, from - to, &alloc_required);
+ if (error)
+ goto out_unlock;
+
+
+ if (alloc_required) {
+ al = gfs2_alloc_get(ip);
- if (file_size > sdp->sd_sb.sb_bsize -
- sizeof(struct gfs2_dinode)) {
- error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page,
- page);
- if (!error)
- error = block_prepare_write(page, from, to,
- get_block);
+ error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+ if (error)
+ goto out_alloc_put;
+
+ error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid);
+ if (error)
+ goto out_qunlock;
+
+ al->al_requested = data_blocks + ind_blocks;
+ error = gfs2_inplace_reserve(ip);
+ if (error)
+ goto out_qunlock;
+ }
+
+ rblocks = RES_DINODE + ind_blocks;
+ if (gfs2_is_jdata(ip))
+ rblocks += data_blocks ? data_blocks : 1;
+ if (ind_blocks || data_blocks)
+ rblocks += RES_STATFS + RES_QUOTA;
+
+ error = gfs2_trans_begin(sdp, rblocks, 0);
+ if (error)
+ goto out;
+
+ if (gfs2_is_stuffed(ip)) {
+ if (end > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
+ error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page, page);
+ if (error == 0)
+ goto prepare_write;
} else if (!PageUptodate(page))
error = stuffed_readpage(ip, page);
- } else
- error = block_prepare_write(page, from, to, get_block);
+ goto out;
+ }
+
+prepare_write:
+ error = block_prepare_write(page, from, to, gfs2_get_block);
+
+out:
+ if (error) {
+ gfs2_trans_end(sdp);
+ if (alloc_required) {
+ gfs2_inplace_release(ip);
+out_qunlock:
+ gfs2_quota_unlock(ip);
+out_alloc_put:
+ gfs2_alloc_put(ip);
+ }
+out_unlock:
+ gfs2_glock_dq_m(1, &ip->i_gh);
+out_uninit:
+ gfs2_holder_uninit(&ip->i_gh);
+ }
return error;
}
struct inode *inode = page->mapping->host;
struct gfs2_inode *ip = get_v2ip(inode);
struct gfs2_sbd *sdp = ip->i_sbd;
- int error;
+ int error = -EOPNOTSUPP;
+ struct buffer_head *dibh;
+ struct gfs2_alloc *al = &ip->i_alloc;;
atomic_inc(&sdp->sd_ops_address);
+
+ if (gfs2_assert_withdraw(sdp, gfs2_glock_is_locked_by_me(ip->i_gl)))
+ goto fail_nounlock;
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto fail_endtrans;
+
+ gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+
if (gfs2_is_stuffed(ip)) {
- struct buffer_head *dibh;
uint64_t file_size;
void *kaddr;
file_size = ((uint64_t)page->index << PAGE_CACHE_SHIFT) + to;
- error = gfs2_meta_inode_buffer(ip, &dibh);
- if (error)
- goto fail;
-
- gfs2_trans_add_bh(ip->i_gl, dibh, 1);
-
- kaddr = kmap(page);
+ kaddr = kmap_atomic(page, KM_USER0);
memcpy(dibh->b_data + sizeof(struct gfs2_dinode) + from,
- (char *)kaddr + from,
- to - from);
- kunmap(page);
-
- brelse(dibh);
+ (char *)kaddr + from, to - from);
+ kunmap_atomic(page, KM_USER0);
SetPageUptodate(page);
if (inode->i_size < file_size)
i_size_write(inode, file_size);
} else {
- if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED)
- gfs2_page_add_databufs(sdp, page, from, to);
+ if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip))
+ gfs2_page_add_databufs(ip, page, from, to);
error = generic_commit_write(file, page, from, to);
if (error)
goto fail;
}
+ if (ip->i_di.di_size < inode->i_size)
+ ip->i_di.di_size = inode->i_size;
+
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
+ gfs2_trans_end(sdp);
+ if (al->al_requested) {
+ gfs2_inplace_release(ip);
+ gfs2_quota_unlock(ip);
+ gfs2_alloc_put(ip);
+ }
+ gfs2_glock_dq_m(1, &ip->i_gh);
+ gfs2_holder_uninit(&ip->i_gh);
return 0;
- fail:
+fail:
+ brelse(dibh);
+fail_endtrans:
+ gfs2_trans_end(sdp);
+ if (al->al_requested) {
+ gfs2_inplace_release(ip);
+ gfs2_quota_unlock(ip);
+ gfs2_alloc_put(ip);
+ }
+ gfs2_glock_dq_m(1, &ip->i_gh);
+ gfs2_holder_uninit(&ip->i_gh);
+fail_nounlock:
ClearPageUptodate(page);
-
return error;
}
return 0;
if (!gfs2_is_stuffed(ip))
- dblock = generic_block_bmap(mapping, lblock, get_block);
+ dblock = generic_block_bmap(mapping, lblock, gfs2_get_block);
gfs2_glock_dq_uninit(&i_gh);
static void discard_buffer(struct gfs2_sbd *sdp, struct buffer_head *bh)
{
- struct gfs2_databuf *db;
+ struct gfs2_bufdata *bd;
gfs2_log_lock(sdp);
- db = get_v2db(bh);
- if (db) {
- db->db_bh = NULL;
- set_v2db(bh, NULL);
+ bd = get_v2bd(bh);
+ if (bd) {
+ bd->bd_bh = NULL;
+ set_v2bd(bh, NULL);
gfs2_log_unlock(sdp);
brelse(bh);
} else
return ret;
}
-static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
- loff_t offset, unsigned long nr_segs)
+static ssize_t gfs2_direct_IO_write(struct kiocb *iocb, const struct iovec *iov,
+ loff_t offset, unsigned long nr_segs)
+{
+ struct file *file = iocb->ki_filp;
+ struct inode *inode = file->f_mapping->host;
+ struct gfs2_inode *ip = get_v2ip(inode);
+ struct gfs2_holder gh;
+ int rv;
+
+ /*
+ * Shared lock, even though its write, since we do no allocation
+ * on this path. All we need change is atime.
+ */
+ gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
+ rv = gfs2_glock_nq_m_atime(1, &gh);
+ if (rv)
+ goto out;
+
+ /*
+ * Should we return an error here? I can't see that O_DIRECT for
+ * a journaled file makes any sense. For now we'll silently fall
+ * back to buffered I/O, likewise we do the same for stuffed
+ * files since they are (a) small and (b) unaligned.
+ */
+ if (gfs2_is_jdata(ip))
+ goto out;
+
+ if (gfs2_is_stuffed(ip))
+ goto out;
+
+ rv = __blockdev_direct_IO(WRITE, iocb, inode, inode->i_sb->s_bdev,
+ iov, offset, nr_segs, get_blocks_noalloc,
+ NULL, DIO_OWN_LOCKING);
+out:
+ gfs2_glock_dq_m(1, &gh);
+ gfs2_holder_uninit(&gh);
+
+ return rv;
+}
+
+/**
+ * gfs2_direct_IO
+ *
+ * This is called with a shared lock already held for the read path.
+ * Currently, no locks are held when the write path is called.
+ */
+static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb,
+ const struct iovec *iov, loff_t offset,
+ unsigned long nr_segs)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
struct gfs2_inode *ip = get_v2ip(inode);
struct gfs2_sbd *sdp = ip->i_sbd;
- get_blocks_t *gb = get_blocks;
atomic_inc(&sdp->sd_ops_address);
+ if (rw == WRITE)
+ return gfs2_direct_IO_write(iocb, iov, offset, nr_segs);
+
if (gfs2_assert_warn(sdp, gfs2_glock_is_locked_by_me(ip->i_gl)) ||
gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip)))
return -EINVAL;
- if (rw == WRITE && !get_transaction)
- gb = get_blocks_noalloc;
-
- return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
- offset, nr_segs, gb, NULL);
+ return __blockdev_direct_IO(READ, iocb, inode, inode->i_sb->s_bdev, iov,
+ offset, nr_segs, get_blocks, NULL,
+ DIO_OWN_LOCKING);
}
struct address_space_operations gfs2_file_aops = {
projects / linux-2.6-omap-h63xx.git / blobdiff