/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
- * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2004-2007 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
#include <linux/pagevec.h>
#include <linux/mpage.h>
#include <linux/fs.h>
+#include <linux/writeback.h>
+#include <linux/swap.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include "trans.h"
#include "rgrp.h"
#include "ops_file.h"
+#include "super.h"
#include "util.h"
#include "glops.h"
end = start + bsize;
if (end <= from || start >= to)
continue;
+ if (gfs2_is_jdata(ip))
+ set_buffer_uptodate(bh);
gfs2_trans_add_bh(ip->i_gl, bh, 0);
}
}
error = gfs2_block_map(inode, lblock, 0, bh_result);
if (error)
return error;
- if (bh_result->b_blocknr == 0)
+ if (!buffer_mapped(bh_result))
return -EIO;
return 0;
}
return 0; /* don't care */
}
- if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) {
+ if ((sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) &&
+ PageChecked(page)) {
+ ClearPageChecked(page);
error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0);
if (error)
goto out_ignore;
return 0;
}
-static int zero_readpage(struct page *page)
+/**
+ * gfs2_writepages - Write a bunch of dirty pages back to disk
+ * @mapping: The mapping to write
+ * @wbc: Write-back control
+ *
+ * For journaled files and/or ordered writes this just falls back to the
+ * kernel's default writepages path for now. We will probably want to change
+ * that eventually (i.e. when we look at allocate on flush).
+ *
+ * For the data=writeback case though we can already ignore buffer heads
+ * and write whole extents at once. This is a big reduction in the
+ * number of I/O requests we send and the bmap calls we make in this case.
+ */
+static int gfs2_writepages(struct address_space *mapping,
+ struct writeback_control *wbc)
{
- void *kaddr;
-
- kaddr = kmap_atomic(page, KM_USER0);
- memset(kaddr, 0, PAGE_CACHE_SIZE);
- kunmap_atomic(kaddr, KM_USER0);
+ struct inode *inode = mapping->host;
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
- SetPageUptodate(page);
+ if (sdp->sd_args.ar_data == GFS2_DATA_WRITEBACK && !gfs2_is_jdata(ip))
+ return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc);
- return 0;
+ return generic_writepages(mapping, wbc);
}
/**
void *kaddr;
int error;
- /* Only the first page of a stuffed file might contain data */
- if (unlikely(page->index))
- return zero_readpage(page);
+ /*
+ * Due to the order of unstuffing files and ->nopage(), we can be
+ * asked for a zero page in the case of a stuffed file being extended,
+ * so we need to supply one here. It doesn't happen often.
+ */
+ if (unlikely(page->index)) {
+ zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
+ return 0;
+ }
error = gfs2_meta_inode_buffer(ip, &dibh);
if (error)
ip->i_di.di_size);
memset(kaddr + ip->i_di.di_size, 0, PAGE_CACHE_SIZE - ip->i_di.di_size);
kunmap_atomic(kaddr, KM_USER0);
-
+ flush_dcache_page(page);
brelse(dibh);
-
SetPageUptodate(page);
return 0;
if (file) {
gf = file->private_data;
if (test_bit(GFF_EXLOCK, &gf->f_flags))
- /* gfs2_sharewrite_nopage has grabbed the ip->i_gl already */
+ /* gfs2_sharewrite_fault has grabbed the ip->i_gl already */
goto skip_lock;
}
- gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|GL_AOP, &gh);
+ gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|LM_FLAG_TRY_1CB, &gh);
do_unlock = 1;
- error = gfs2_glock_nq_m_atime(1, &gh);
+ error = gfs2_glock_nq_atime(&gh);
if (unlikely(error))
goto out_unlock;
}
return error;
out_unlock:
unlock_page(page);
+ if (error == GLR_TRYFAILED) {
+ error = AOP_TRUNCATED_PAGE;
+ yield();
+ }
if (do_unlock)
gfs2_holder_uninit(&gh);
goto out;
* the page lock and the glock) and return having done no I/O. Its
* obviously not something we'd want to do on too regular a basis.
* Any I/O we ignore at this time will be done via readpage later.
- * 2. We have to handle stuffed files here too.
+ * 2. We don't handle stuffed files here we let readpage do the honours.
* 3. mpage_readpages() does most of the heavy lifting in the common case.
* 4. gfs2_get_block() is relied upon to set BH_Boundary in the right places.
* 5. We use LM_FLAG_TRY_1CB here, effectively we then have lock-ahead as
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
struct gfs2_holder gh;
- unsigned page_idx;
- int ret;
+ int ret = 0;
int do_unlock = 0;
if (likely(file != &gfs2_internal_file_sentinel)) {
goto skip_lock;
}
gfs2_holder_init(ip->i_gl, LM_ST_SHARED,
- LM_FLAG_TRY_1CB|GL_ATIME|GL_AOP, &gh);
+ LM_FLAG_TRY_1CB|GL_ATIME, &gh);
do_unlock = 1;
- ret = gfs2_glock_nq_m_atime(1, &gh);
+ ret = gfs2_glock_nq_atime(&gh);
if (ret == GLR_TRYFAILED)
goto out_noerror;
if (unlikely(ret))
goto out_unlock;
}
skip_lock:
- if (gfs2_is_stuffed(ip)) {
- struct pagevec lru_pvec;
- pagevec_init(&lru_pvec, 0);
- for (page_idx = 0; page_idx < nr_pages; page_idx++) {
- struct page *page = list_entry(pages->prev, struct page, lru);
- prefetchw(&page->flags);
- list_del(&page->lru);
- if (!add_to_page_cache(page, mapping,
- page->index, GFP_KERNEL)) {
- ret = stuffed_readpage(ip, page);
- unlock_page(page);
- if (!pagevec_add(&lru_pvec, page))
- __pagevec_lru_add(&lru_pvec);
- } else {
- page_cache_release(page);
- }
- }
- pagevec_lru_add(&lru_pvec);
- ret = 0;
- } else {
- /* What we really want to do .... */
+ if (!gfs2_is_stuffed(ip))
ret = mpage_readpages(mapping, pages, nr_pages, gfs2_get_block);
- }
if (do_unlock) {
gfs2_glock_dq_m(1, &gh);
}
/**
- * gfs2_prepare_write - Prepare to write a page to a file
+ * gfs2_write_begin - Begin to write to a file
* @file: The file to write to
- * @page: The page which is to be prepared for writing
- * @from: From (byte range within page)
- * @to: To (byte range within page)
+ * @mapping: The mapping in which to write
+ * @pos: The file offset at which to start writing
+ * @len: Length of the write
+ * @flags: Various flags
+ * @pagep: Pointer to return the page
+ * @fsdata: Pointer to return fs data (unused by GFS2)
*
* Returns: errno
*/
-static int gfs2_prepare_write(struct file *file, struct page *page,
- unsigned from, unsigned to)
+static int gfs2_write_begin(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
{
- struct gfs2_inode *ip = GFS2_I(page->mapping->host);
- struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
+ struct gfs2_inode *ip = GFS2_I(mapping->host);
+ struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
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;
- unsigned int write_len = to - from;
-
-
- gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME|GL_AOP, &ip->i_gh);
- error = gfs2_glock_nq_m_atime(1, &ip->i_gh);
- if (error)
+ pgoff_t index = pos >> PAGE_CACHE_SHIFT;
+ unsigned from = pos & (PAGE_CACHE_SIZE - 1);
+ unsigned to = from + len;
+ struct page *page;
+
+ gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME, &ip->i_gh);
+ error = gfs2_glock_nq_atime(&ip->i_gh);
+ if (unlikely(error))
goto out_uninit;
- gfs2_write_calc_reserv(ip, write_len, &data_blocks, &ind_blocks);
+ error = -ENOMEM;
+ page = __grab_cache_page(mapping, index);
+ *pagep = page;
+ if (!page)
+ goto out_unlock;
+
+ gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks);
- error = gfs2_write_alloc_required(ip, pos, write_len, &alloc_required);
+ error = gfs2_write_alloc_required(ip, pos, len, &alloc_required);
if (error)
- goto out_unlock;
+ goto out_putpage;
ip->i_alloc.al_requested = 0;
if (ind_blocks || data_blocks)
rblocks += RES_STATFS + RES_QUOTA;
- error = gfs2_trans_begin(sdp, rblocks, 0);
+ error = gfs2_trans_begin(sdp, rblocks,
+ PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
if (error)
- goto out;
+ goto out_trans_fail;
if (gfs2_is_stuffed(ip)) {
- if (end > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
+ if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
error = gfs2_unstuff_dinode(ip, page);
if (error == 0)
goto prepare_write;
out:
if (error) {
gfs2_trans_end(sdp);
+out_trans_fail:
if (alloc_required) {
gfs2_inplace_release(ip);
out_qunlock:
out_alloc_put:
gfs2_alloc_put(ip);
}
+out_putpage:
+ page_cache_release(page);
+ if (pos + len > ip->i_inode.i_size)
+ vmtruncate(&ip->i_inode, ip->i_inode.i_size);
out_unlock:
gfs2_glock_dq_m(1, &ip->i_gh);
out_uninit:
}
/**
- * gfs2_commit_write - Commit write to a file
+ * adjust_fs_space - Adjusts the free space available due to gfs2_grow
+ * @inode: the rindex inode
+ */
+static void adjust_fs_space(struct inode *inode)
+{
+ struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
+ struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
+ struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
+ u64 fs_total, new_free;
+
+ /* Total up the file system space, according to the latest rindex. */
+ fs_total = gfs2_ri_total(sdp);
+
+ spin_lock(&sdp->sd_statfs_spin);
+ if (fs_total > (m_sc->sc_total + l_sc->sc_total))
+ new_free = fs_total - (m_sc->sc_total + l_sc->sc_total);
+ else
+ new_free = 0;
+ spin_unlock(&sdp->sd_statfs_spin);
+ fs_warn(sdp, "File system extended by %llu blocks.\n",
+ (unsigned long long)new_free);
+ gfs2_statfs_change(sdp, new_free, new_free, 0);
+}
+
+/**
+ * gfs2_stuffed_write_end - Write end for stuffed files
+ * @inode: The inode
+ * @dibh: The buffer_head containing the on-disk inode
+ * @pos: The file position
+ * @len: The length of the write
+ * @copied: How much was actually copied by the VFS
+ * @page: The page
+ *
+ * This copies the data from the page into the inode block after
+ * the inode data structure itself.
+ *
+ * Returns: errno
+ */
+static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ u64 to = pos + copied;
+ void *kaddr;
+ unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode);
+ struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
+
+ BUG_ON((pos + len) > (dibh->b_size - sizeof(struct gfs2_dinode)));
+ kaddr = kmap_atomic(page, KM_USER0);
+ memcpy(buf + pos, kaddr + pos, copied);
+ memset(kaddr + pos + copied, 0, len - copied);
+ flush_dcache_page(page);
+ kunmap_atomic(kaddr, KM_USER0);
+
+ if (!PageUptodate(page))
+ SetPageUptodate(page);
+ unlock_page(page);
+ page_cache_release(page);
+
+ if (inode->i_size < to) {
+ i_size_write(inode, to);
+ ip->i_di.di_size = inode->i_size;
+ di->di_size = cpu_to_be64(inode->i_size);
+ mark_inode_dirty(inode);
+ }
+
+ if (inode == sdp->sd_rindex)
+ adjust_fs_space(inode);
+
+ brelse(dibh);
+ gfs2_trans_end(sdp);
+ gfs2_glock_dq(&ip->i_gh);
+ gfs2_holder_uninit(&ip->i_gh);
+ return copied;
+}
+
+/**
+ * gfs2_write_end
* @file: The file to write to
- * @page: The page containing the data
- * @from: From (byte range within page)
- * @to: To (byte range within page)
+ * @mapping: The address space to write to
+ * @pos: The file position
+ * @len: The length of the data
+ * @copied:
+ * @page: The page that has been written
+ * @fsdata: The fsdata (unused in GFS2)
+ *
+ * The main write_end function for GFS2. We have a separate one for
+ * stuffed files as they are slightly different, otherwise we just
+ * put our locking around the VFS provided functions.
*
* Returns: errno
*/
-static int gfs2_commit_write(struct file *file, struct page *page,
- unsigned from, unsigned to)
+static int gfs2_write_end(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata)
{
struct inode *inode = page->mapping->host;
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
- int error = -EOPNOTSUPP;
struct buffer_head *dibh;
struct gfs2_alloc *al = &ip->i_alloc;
struct gfs2_dinode *di;
+ unsigned int from = pos & (PAGE_CACHE_SIZE - 1);
+ unsigned int to = from + len;
+ int ret;
- if (gfs2_assert_withdraw(sdp, gfs2_glock_is_locked_by_me(ip->i_gl)))
- goto fail_nounlock;
+ BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == 0);
- error = gfs2_meta_inode_buffer(ip, &dibh);
- if (error)
- goto fail_endtrans;
+ ret = gfs2_meta_inode_buffer(ip, &dibh);
+ if (unlikely(ret)) {
+ unlock_page(page);
+ page_cache_release(page);
+ goto failed;
+ }
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
- di = (struct gfs2_dinode *)dibh->b_data;
-
- if (gfs2_is_stuffed(ip)) {
- u64 file_size;
- void *kaddr;
-
- file_size = ((u64)page->index << PAGE_CACHE_SHIFT) + to;
- kaddr = kmap_atomic(page, KM_USER0);
- memcpy(dibh->b_data + sizeof(struct gfs2_dinode) + from,
- kaddr + from, to - from);
- kunmap_atomic(kaddr, KM_USER0);
+ if (gfs2_is_stuffed(ip))
+ return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page);
- SetPageUptodate(page);
+ if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip))
+ gfs2_page_add_databufs(ip, page, from, to);
- if (inode->i_size < file_size)
- i_size_write(inode, file_size);
- } else {
- 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;
- }
+ ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
- if (ip->i_di.di_size < inode->i_size) {
- ip->i_di.di_size = inode->i_size;
- di->di_size = cpu_to_be64(inode->i_size);
+ if (likely(ret >= 0)) {
+ copied = ret;
+ if ((pos + copied) > inode->i_size) {
+ di = (struct gfs2_dinode *)dibh->b_data;
+ ip->i_di.di_size = inode->i_size;
+ di->di_size = cpu_to_be64(inode->i_size);
+ mark_inode_dirty(inode);
+ }
}
- di->di_atime = cpu_to_be64(inode->i_atime.tv_sec);
- di->di_mtime = cpu_to_be64(inode->i_mtime.tv_sec);
- di->di_ctime = cpu_to_be64(inode->i_ctime.tv_sec);
+ if (inode == sdp->sd_rindex)
+ adjust_fs_space(inode);
brelse(dibh);
gfs2_trans_end(sdp);
+failed:
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_glock_dq(&ip->i_gh);
gfs2_holder_uninit(&ip->i_gh);
- return 0;
+ return ret;
+}
-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;
+/**
+ * gfs2_set_page_dirty - Page dirtying function
+ * @page: The page to dirty
+ *
+ * Returns: 1 if it dirtyed the page, or 0 otherwise
+ */
+
+static int gfs2_set_page_dirty(struct page *page)
+{
+ struct gfs2_inode *ip = GFS2_I(page->mapping->host);
+ struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
+
+ if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip))
+ SetPageChecked(page);
+ return __set_page_dirty_buffers(page);
}
/**
return dblock;
}
-static void discard_buffer(struct gfs2_sbd *sdp, struct buffer_head *bh)
+static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
{
struct gfs2_bufdata *bd;
+ lock_buffer(bh);
gfs2_log_lock(sdp);
+ clear_buffer_dirty(bh);
bd = bh->b_private;
if (bd) {
- bd->bd_bh = NULL;
- bh->b_private = NULL;
+ if (!list_empty(&bd->bd_le.le_list) && !buffer_pinned(bh))
+ list_del_init(&bd->bd_le.le_list);
+ else
+ gfs2_remove_from_journal(bh, current->journal_info, 0);
}
- gfs2_log_unlock(sdp);
-
- lock_buffer(bh);
- clear_buffer_dirty(bh);
bh->b_bdev = NULL;
clear_buffer_mapped(bh);
clear_buffer_req(bh);
clear_buffer_new(bh);
- clear_buffer_delay(bh);
+ gfs2_log_unlock(sdp);
unlock_buffer(bh);
}
static void gfs2_invalidatepage(struct page *page, unsigned long offset)
{
struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
- struct buffer_head *head, *bh, *next;
- unsigned int curr_off = 0;
+ struct buffer_head *bh, *head;
+ unsigned long pos = 0;
BUG_ON(!PageLocked(page));
+ if (offset == 0)
+ ClearPageChecked(page);
if (!page_has_buffers(page))
- return;
+ goto out;
bh = head = page_buffers(page);
do {
- unsigned int next_off = curr_off + bh->b_size;
- next = bh->b_this_page;
-
- if (offset <= curr_off)
- discard_buffer(sdp, bh);
-
- curr_off = next_off;
- bh = next;
+ if (offset <= pos)
+ gfs2_discard(sdp, bh);
+ pos += bh->b_size;
+ bh = bh->b_this_page;
} while (bh != head);
-
- if (!offset)
+out:
+ if (offset == 0)
try_to_release_page(page, 0);
+}
- return;
+/**
+ * gfs2_ok_for_dio - check that dio is valid on this file
+ * @ip: The inode
+ * @rw: READ or WRITE
+ * @offset: The offset at which we are reading or writing
+ *
+ * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o)
+ * 1 (to accept the i/o request)
+ */
+static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset)
+{
+ /*
+ * 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))
+ return 0;
+
+ if (gfs2_is_stuffed(ip))
+ return 0;
+
+ if (offset > i_size_read(&ip->i_inode))
+ return 0;
+ return 1;
}
+
+
static ssize_t gfs2_direct_IO(int rw, struct kiocb *iocb,
const struct iovec *iov, loff_t offset,
unsigned long nr_segs)
struct gfs2_holder gh;
int rv;
- if (rw == READ)
- mutex_lock(&inode->i_mutex);
/*
- * Shared lock, even if its a write, since we do no allocation
- * on this path. All we need change is atime.
+ * Deferred lock, even if its a write, since we do no allocation
+ * on this path. All we need change is atime, and this lock mode
+ * ensures that other nodes have flushed their buffered read caches
+ * (i.e. their page cache entries for this inode). We do not,
+ * unfortunately have the option of only flushing a range like
+ * the VFS does.
*/
- gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
- rv = gfs2_glock_nq_m_atime(1, &gh);
+ gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, GL_ATIME, &gh);
+ rv = gfs2_glock_nq_atime(&gh);
if (rv)
- goto out;
-
- if (offset > i_size_read(inode))
- 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_own_locking(rw, iocb, inode,
- inode->i_sb->s_bdev,
- iov, offset, nr_segs,
- gfs2_get_block_direct, NULL);
+ return rv;
+ rv = gfs2_ok_for_dio(ip, rw, offset);
+ if (rv != 1)
+ goto out; /* dio not valid, fall back to buffered i/o */
+
+ rv = blockdev_direct_IO_no_locking(rw, iocb, inode, inode->i_sb->s_bdev,
+ iov, offset, nr_segs,
+ gfs2_get_block_direct, NULL);
out:
gfs2_glock_dq_m(1, &gh);
gfs2_holder_uninit(&gh);
- if (rw == READ)
- mutex_unlock(&inode->i_mutex);
-
return rv;
}
/**
- * stuck_releasepage - We're stuck in gfs2_releasepage(). Print stuff out.
- * @bh: the buffer we're stuck on
- *
- */
-
-static void stuck_releasepage(struct buffer_head *bh)
-{
- struct inode *inode = bh->b_page->mapping->host;
- struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
- struct gfs2_bufdata *bd = bh->b_private;
- struct gfs2_glock *gl;
-static unsigned limit = 0;
-
- if (limit > 3)
- return;
- limit++;
-
- fs_warn(sdp, "stuck in gfs2_releasepage() %p\n", inode);
- fs_warn(sdp, "blkno = %llu, bh->b_count = %d\n",
- (unsigned long long)bh->b_blocknr, atomic_read(&bh->b_count));
- fs_warn(sdp, "pinned = %u\n", buffer_pinned(bh));
- fs_warn(sdp, "bh->b_private = %s\n", (bd) ? "!NULL" : "NULL");
-
- if (!bd)
- return;
-
- gl = bd->bd_gl;
-
- fs_warn(sdp, "gl = (%u, %llu)\n",
- gl->gl_name.ln_type, (unsigned long long)gl->gl_name.ln_number);
-
- fs_warn(sdp, "bd_list_tr = %s, bd_le.le_list = %s\n",
- (list_empty(&bd->bd_list_tr)) ? "no" : "yes",
- (list_empty(&bd->bd_le.le_list)) ? "no" : "yes");
-
- if (gl->gl_ops == &gfs2_inode_glops) {
- struct gfs2_inode *ip = gl->gl_object;
- unsigned int x;
-
- if (!ip)
- return;
-
- fs_warn(sdp, "ip = %llu %llu\n",
- (unsigned long long)ip->i_num.no_formal_ino,
- (unsigned long long)ip->i_num.no_addr);
-
- for (x = 0; x < GFS2_MAX_META_HEIGHT; x++)
- fs_warn(sdp, "ip->i_cache[%u] = %s\n",
- x, (ip->i_cache[x]) ? "!NULL" : "NULL");
- }
-}
-
-/**
* gfs2_releasepage - free the metadata associated with a page
* @page: the page that's being released
* @gfp_mask: passed from Linux VFS, ignored by us
struct gfs2_sbd *sdp = aspace->i_sb->s_fs_info;
struct buffer_head *bh, *head;
struct gfs2_bufdata *bd;
- unsigned long t = jiffies + gfs2_tune_get(sdp, gt_stall_secs) * HZ;
if (!page_has_buffers(page))
- goto out;
+ return 0;
+ gfs2_log_lock(sdp);
head = bh = page_buffers(page);
do {
- while (atomic_read(&bh->b_count)) {
- if (!atomic_read(&aspace->i_writecount))
- return 0;
-
- if (time_after_eq(jiffies, t)) {
- stuck_releasepage(bh);
- /* should we withdraw here? */
- return 0;
- }
-
- yield();
- }
-
+ if (atomic_read(&bh->b_count))
+ goto cannot_release;
+ bd = bh->b_private;
+ if (bd && bd->bd_ail)
+ goto cannot_release;
gfs2_assert_warn(sdp, !buffer_pinned(bh));
gfs2_assert_warn(sdp, !buffer_dirty(bh));
+ bh = bh->b_this_page;
+ } while(bh != head);
+ gfs2_log_unlock(sdp);
+ head = bh = page_buffers(page);
+ do {
gfs2_log_lock(sdp);
bd = bh->b_private;
if (bd) {
gfs2_assert_warn(sdp, bd->bd_bh == bh);
gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr));
- gfs2_assert_warn(sdp, !bd->bd_ail);
- bd->bd_bh = NULL;
- if (!list_empty(&bd->bd_le.le_list))
- bd = NULL;
+ if (!list_empty(&bd->bd_le.le_list)) {
+ if (!buffer_pinned(bh))
+ list_del_init(&bd->bd_le.le_list);
+ else
+ bd = NULL;
+ }
+ if (bd)
+ bd->bd_bh = NULL;
bh->b_private = NULL;
}
gfs2_log_unlock(sdp);
bh = bh->b_this_page;
} while (bh != head);
-out:
return try_to_free_buffers(page);
+cannot_release:
+ gfs2_log_unlock(sdp);
+ return 0;
}
const struct address_space_operations gfs2_file_aops = {
.writepage = gfs2_writepage,
+ .writepages = gfs2_writepages,
.readpage = gfs2_readpage,
.readpages = gfs2_readpages,
.sync_page = block_sync_page,
- .prepare_write = gfs2_prepare_write,
- .commit_write = gfs2_commit_write,
+ .write_begin = gfs2_write_begin,
+ .write_end = gfs2_write_end,
+ .set_page_dirty = gfs2_set_page_dirty,
.bmap = gfs2_bmap,
.invalidatepage = gfs2_invalidatepage,
.releasepage = gfs2_releasepage,
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff