Commit 28fd1298 authored by OGAWA Hirofumi's avatar OGAWA Hirofumi Committed by Linus Torvalds
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[PATCH] Fix and add EXPORT_SYMBOL(filemap_write_and_wait)



This patch add EXPORT_SYMBOL(filemap_write_and_wait) and use it.

See mm/filemap.c:

And changes the filemap_write_and_wait() and filemap_write_and_wait_range().

Current filemap_write_and_wait() doesn't wait if filemap_fdatawrite()
returns error.  However, even if filemap_fdatawrite() returned an
error, it may have submitted the partially data pages to the device.
(e.g. in the case of -ENOSPC)

<quotation>
Andrew Morton writes,

If filemap_fdatawrite() returns an error, this might be due to some
I/O problem: dead disk, unplugged cable, etc.  Given the generally
crappy quality of the kernel's handling of such exceptions, there's a
good chance that the filemap_fdatawait() will get stuck in D state
forever.
</quotation>

So, this patch doesn't wait if filemap_fdatawrite() returns the -EIO.

Trond, could you please review the nfs part?  Especially I'm not sure,
nfs must use the "filemap_fdatawrite(inode->i_mapping) == 0", or not.
Acked-by: default avatarTrond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 05eb0b51
......@@ -193,8 +193,7 @@ int v9fs_dir_release(struct inode *inode, struct file *filp)
fid->fid);
fidnum = fid->fid;
filemap_fdatawrite(inode->i_mapping);
filemap_fdatawait(inode->i_mapping);
filemap_write_and_wait(inode->i_mapping);
if (fidnum >= 0) {
dprintk(DEBUG_VFS, "fidopen: %d v9f->fid: %d\n", fid->fidopen,
......
......@@ -165,8 +165,7 @@ static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
return -ENOLCK;
if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
filemap_fdatawrite(inode->i_mapping);
filemap_fdatawait(inode->i_mapping);
filemap_write_and_wait(inode->i_mapping);
invalidate_inode_pages(&inode->i_data);
}
......
......@@ -153,14 +153,8 @@ int sync_blockdev(struct block_device *bdev)
{
int ret = 0;
if (bdev) {
int err;
ret = filemap_fdatawrite(bdev->bd_inode->i_mapping);
err = filemap_fdatawait(bdev->bd_inode->i_mapping);
if (!ret)
ret = err;
}
if (bdev)
ret = filemap_write_and_wait(bdev->bd_inode->i_mapping);
return ret;
}
EXPORT_SYMBOL(sync_blockdev);
......
......@@ -127,8 +127,7 @@ static inline int cifs_open_inode_helper(struct inode *inode, struct file *file,
if (file->f_dentry->d_inode->i_mapping) {
/* BB no need to lock inode until after invalidate
since namei code should already have it locked? */
filemap_fdatawrite(file->f_dentry->d_inode->i_mapping);
filemap_fdatawait(file->f_dentry->d_inode->i_mapping);
filemap_write_and_wait(file->f_dentry->d_inode->i_mapping);
}
cFYI(1, ("invalidating remote inode since open detected it "
"changed"));
......@@ -419,8 +418,7 @@ static int cifs_reopen_file(struct inode *inode, struct file *file,
pCifsInode = CIFS_I(inode);
if (pCifsInode) {
if (can_flush) {
filemap_fdatawrite(inode->i_mapping);
filemap_fdatawait(inode->i_mapping);
filemap_write_and_wait(inode->i_mapping);
/* temporarily disable caching while we
go to server to get inode info */
pCifsInode->clientCanCacheAll = FALSE;
......
......@@ -1148,8 +1148,7 @@ int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
/* BB check if we need to refresh inode from server now ? BB */
/* need to flush data before changing file size on server */
filemap_fdatawrite(direntry->d_inode->i_mapping);
filemap_fdatawait(direntry->d_inode->i_mapping);
filemap_write_and_wait(direntry->d_inode->i_mapping);
if (attrs->ia_valid & ATTR_SIZE) {
/* To avoid spurious oplock breaks from server, in the case of
......
......@@ -302,8 +302,7 @@ int dbSync(struct inode *ipbmap)
/*
* write out dirty pages of bmap
*/
filemap_fdatawrite(ipbmap->i_mapping);
filemap_fdatawait(ipbmap->i_mapping);
filemap_write_and_wait(ipbmap->i_mapping);
diWriteSpecial(ipbmap, 0);
......
......@@ -265,8 +265,7 @@ int diSync(struct inode *ipimap)
/*
* write out dirty pages of imap
*/
filemap_fdatawrite(ipimap->i_mapping);
filemap_fdatawait(ipimap->i_mapping);
filemap_write_and_wait(ipimap->i_mapping);
diWriteSpecial(ipimap, 0);
......@@ -565,8 +564,7 @@ void diFreeSpecial(struct inode *ip)
jfs_err("diFreeSpecial called with NULL ip!");
return;
}
filemap_fdatawrite(ip->i_mapping);
filemap_fdatawait(ip->i_mapping);
filemap_write_and_wait(ip->i_mapping);
truncate_inode_pages(ip->i_mapping, 0);
iput(ip);
}
......
......@@ -1231,10 +1231,8 @@ int txCommit(tid_t tid, /* transaction identifier */
* when we don't need to worry about it at all.
*
* if ((!S_ISDIR(ip->i_mode))
* && (tblk->flag & COMMIT_DELETE) == 0) {
* filemap_fdatawrite(ip->i_mapping);
* filemap_fdatawait(ip->i_mapping);
* }
* && (tblk->flag & COMMIT_DELETE) == 0)
* filemap_write_and_wait(ip->i_mapping);
*/
/*
......
......@@ -108,8 +108,7 @@ int jfs_umount(struct super_block *sb)
* Make sure all metadata makes it to disk before we mark
* the superblock as clean
*/
filemap_fdatawrite(sbi->direct_inode->i_mapping);
filemap_fdatawait(sbi->direct_inode->i_mapping);
filemap_write_and_wait(sbi->direct_inode->i_mapping);
/*
* ensure all file system file pages are propagated to their
......@@ -161,8 +160,7 @@ int jfs_umount_rw(struct super_block *sb)
* mark the superblock clean before everything is flushed to
* disk.
*/
filemap_fdatawrite(sbi->direct_inode->i_mapping);
filemap_fdatawait(sbi->direct_inode->i_mapping);
filemap_write_and_wait(sbi->direct_inode->i_mapping);
updateSuper(sb, FM_CLEAN);
......
......@@ -376,8 +376,7 @@ int jfs_extendfs(struct super_block *sb, s64 newLVSize, int newLogSize)
* by txCommit();
*/
filemap_fdatawait(ipbmap->i_mapping);
filemap_fdatawrite(ipbmap->i_mapping);
filemap_fdatawait(ipbmap->i_mapping);
filemap_write_and_wait(ipbmap->i_mapping);
diWriteSpecial(ipbmap, 0);
newPage = nPages; /* first new page number */
......
......@@ -502,8 +502,7 @@ out_no_rw:
jfs_err("jfs_umount failed with return code %d", rc);
}
out_mount_failed:
filemap_fdatawrite(sbi->direct_inode->i_mapping);
filemap_fdatawait(sbi->direct_inode->i_mapping);
filemap_write_and_wait(sbi->direct_inode->i_mapping);
truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
make_bad_inode(sbi->direct_inode);
iput(sbi->direct_inode);
......
......@@ -644,10 +644,7 @@ int nfs_sync_mapping(struct address_space *mapping)
if (mapping->nrpages == 0)
return 0;
unmap_mapping_range(mapping, 0, 0, 0);
ret = filemap_fdatawrite(mapping);
if (ret != 0)
goto out;
ret = filemap_fdatawait(mapping);
ret = filemap_write_and_wait(mapping);
if (ret != 0)
goto out;
ret = nfs_wb_all(mapping->host);
......@@ -864,8 +861,7 @@ nfs_setattr(struct dentry *dentry, struct iattr *attr)
nfs_begin_data_update(inode);
/* Write all dirty data if we're changing file permissions or size */
if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE)) != 0) {
if (filemap_fdatawrite(inode->i_mapping) == 0)
filemap_fdatawait(inode->i_mapping);
filemap_write_and_wait(inode->i_mapping);
nfs_wb_all(inode);
}
/*
......
......@@ -374,8 +374,7 @@ smb_file_release(struct inode *inode, struct file * file)
/* We must flush any dirty pages now as we won't be able to
write anything after close. mmap can trigger this.
"openers" should perhaps include mmap'ers ... */
filemap_fdatawrite(inode->i_mapping);
filemap_fdatawait(inode->i_mapping);
filemap_write_and_wait(inode->i_mapping);
smb_close(inode);
}
unlock_kernel();
......
......@@ -697,8 +697,7 @@ smb_notify_change(struct dentry *dentry, struct iattr *attr)
DENTRY_PATH(dentry),
(long) inode->i_size, (long) attr->ia_size);
filemap_fdatawrite(inode->i_mapping);
filemap_fdatawait(inode->i_mapping);
filemap_write_and_wait(inode->i_mapping);
error = smb_open(dentry, O_WRONLY);
if (error)
......
......@@ -79,8 +79,7 @@ fs_flushinval_pages(
struct inode *ip = LINVFS_GET_IP(vp);
if (VN_CACHED(vp)) {
filemap_fdatawrite(ip->i_mapping);
filemap_fdatawait(ip->i_mapping);
filemap_write_and_wait(ip->i_mapping);
truncate_inode_pages(ip->i_mapping, first);
}
......
......@@ -343,30 +343,44 @@ EXPORT_SYMBOL(filemap_fdatawait);
int filemap_write_and_wait(struct address_space *mapping)
{
int retval = 0;
int err = 0;
if (mapping->nrpages) {
retval = filemap_fdatawrite(mapping);
if (retval == 0)
retval = filemap_fdatawait(mapping);
err = filemap_fdatawrite(mapping);
/*
* Even if the above returned error, the pages may be
* written partially (e.g. -ENOSPC), so we wait for it.
* But the -EIO is special case, it may indicate the worst
* thing (e.g. bug) happened, so we avoid waiting for it.
*/
if (err != -EIO) {
int err2 = filemap_fdatawait(mapping);
if (!err)
err = err2;
}
}
return retval;
return err;
}
EXPORT_SYMBOL(filemap_write_and_wait);
int filemap_write_and_wait_range(struct address_space *mapping,
loff_t lstart, loff_t lend)
{
int retval = 0;
int err = 0;
if (mapping->nrpages) {
retval = __filemap_fdatawrite_range(mapping, lstart, lend,
WB_SYNC_ALL);
if (retval == 0)
retval = wait_on_page_writeback_range(mapping,
lstart >> PAGE_CACHE_SHIFT,
lend >> PAGE_CACHE_SHIFT);
err = __filemap_fdatawrite_range(mapping, lstart, lend,
WB_SYNC_ALL);
/* See comment of filemap_write_and_wait() */
if (err != -EIO) {
int err2 = wait_on_page_writeback_range(mapping,
lstart >> PAGE_CACHE_SHIFT,
lend >> PAGE_CACHE_SHIFT);
if (!err)
err = err2;
}
}
return retval;
return err;
}
/*
......
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