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xfs: new truncate sequence

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Convert XFS to the new truncate sequence.  We still can have errors after
updating the file size in xfs_setattr, but these are real I/O errors and lead
to a transaction abort and filesystem shutdown, so they are not an issue.

Errors from ->write_begin and write_end can now be handled correctly because
we can actually get rid of the delalloc extents while previous the buffer
state was stipped in block_invalidatepage.

There is still no error handling for ->direct_IO, because doing so will need
some major restructuring given that we only have the iolock shared and do not
hold i_mutex at all.  Fortunately leaving the normally allocated blocks behind
there is not a major issue and this will get cleaned up by xfs_free_eofblock
later.

Note: the patch is against Al's vfs.git tree as that contains the nessecary
preparations.  I'd prefer to get it applied there so that we can get some
testing in linux-next.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2010-06-14 05:17:31 -04:00 committed by Al Viro
parent 2f246fd0f1
commit fa9b227e90
4 changed files with 56 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
fs/xfs/linux-2.6/xfs_aops.c
View File

@ -1494,6 +1494,22 @@ xfs_vm_direct_IO(
return ret;
}
STATIC void
xfs_vm_write_failed(
struct address_space *mapping,
loff_t to)
{
struct inode *inode = mapping->host;
if (to > inode->i_size) {
struct iattr ia = {
.ia_valid = ATTR_SIZE | ATTR_FORCE,
.ia_size = inode->i_size,
};
xfs_setattr(XFS_I(inode), &ia, XFS_ATTR_NOLOCK);
}
}
STATIC int
xfs_vm_write_begin(
struct file *file,
@ -1508,12 +1524,26 @@ xfs_vm_write_begin(
ret = block_write_begin(mapping, pos, len, flags | AOP_FLAG_NOFS,
pagep, xfs_get_blocks);
if (unlikely(ret)) {
loff_t isize = mapping->host->i_size;
if (pos + len > isize)
vmtruncate(mapping->host, isize);
}
if (unlikely(ret))
xfs_vm_write_failed(mapping, pos + len);
return ret;
}
STATIC int
xfs_vm_write_end(
struct file *file,
struct address_space *mapping,
loff_t pos,
unsigned len,
unsigned copied,
struct page *page,
void *fsdata)
{
int ret;
ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
if (unlikely(ret < len))
xfs_vm_write_failed(mapping, pos + len);
return ret;
}
@ -1559,7 +1589,7 @@ const struct address_space_operations xfs_address_space_operations = {
.releasepage = xfs_vm_releasepage,
.invalidatepage = xfs_vm_invalidatepage,
.write_begin = xfs_vm_write_begin,
.write_end = generic_write_end,
.write_end = xfs_vm_write_end,
.bmap = xfs_vm_bmap,
.direct_IO = xfs_vm_direct_IO,
.migratepage = buffer_migrate_page,

16
fs/xfs/linux-2.6/xfs_iops.c
View File

@ -540,21 +540,6 @@ xfs_vn_setattr(
return -xfs_setattr(XFS_I(dentry->d_inode), iattr, 0);
}
/*
* block_truncate_page can return an error, but we can't propagate it
* at all here. Leave a complaint + stack trace in the syslog because
* this could be bad. If it is bad, we need to propagate the error further.
*/
STATIC void
xfs_vn_truncate(
struct inode *inode)
{
int error;
error = block_truncate_page(inode->i_mapping, inode->i_size,
xfs_get_blocks);
WARN_ON(error);
}
STATIC long
xfs_vn_fallocate(
struct inode *inode,
@ -694,7 +679,6 @@ xfs_vn_fiemap(
static const struct inode_operations xfs_inode_operations = {
.check_acl = xfs_check_acl,
.truncate = xfs_vn_truncate,
.getattr = xfs_vn_getattr,
.setattr = xfs_vn_setattr,
.setxattr = generic_setxattr,

2
fs/xfs/linux-2.6/xfs_linux.h
View File

@ -156,8 +156,6 @@
*/
#define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL)
#define xfs_stack_trace() dump_stack()
#define xfs_itruncate_data(ip, off) \
(-vmtruncate(VFS_I(ip), (off)))
/* Move the kernel do_div definition off to one side */

38
fs/xfs/xfs_vnodeops.c
View File

@ -221,8 +221,11 @@ xfs_setattr(
* transaction to modify the i_size.
*/
code = xfs_zero_eof(ip, iattr->ia_size, ip->i_size);
if (code)
goto error_return;
}
xfs_iunlock(ip, XFS_ILOCK_EXCL);
lock_flags &= ~XFS_ILOCK_EXCL;
/*
* We are going to log the inode size change in this
@ -236,36 +239,35 @@ xfs_setattr(
* really care about here and prevents waiting for other data
* not within the range we care about here.
*/
if (!code &&
ip->i_size != ip->i_d.di_size &&
if (ip->i_size != ip->i_d.di_size &&
iattr->ia_size > ip->i_d.di_size) {
code = xfs_flush_pages(ip,
ip->i_d.di_size, iattr->ia_size,
XBF_ASYNC, FI_NONE);
if (code)
goto error_return;
}
/* wait for all I/O to complete */
xfs_ioend_wait(ip);
if (!code)
code = xfs_itruncate_data(ip, iattr->ia_size);
if (code) {
ASSERT(tp == NULL);
lock_flags &= ~XFS_ILOCK_EXCL;
ASSERT(lock_flags == XFS_IOLOCK_EXCL || !need_iolock);
code = -block_truncate_page(inode->i_mapping, iattr->ia_size,
xfs_get_blocks);
if (code)
goto error_return;
}
tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
if ((code = xfs_trans_reserve(tp, 0,
XFS_ITRUNCATE_LOG_RES(mp), 0,
XFS_TRANS_PERM_LOG_RES,
XFS_ITRUNCATE_LOG_COUNT))) {
xfs_trans_cancel(tp, 0);
if (need_iolock)
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
return code;
}
code = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
XFS_TRANS_PERM_LOG_RES,
XFS_ITRUNCATE_LOG_COUNT);
if (code)
goto error_return;
truncate_setsize(inode, iattr->ia_size);
commit_flags = XFS_TRANS_RELEASE_LOG_RES;
lock_flags |= XFS_ILOCK_EXCL;
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip);