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authorChristoph Hellwig <hch@infradead.org>2011-12-18 20:00:12 +0000
committerBen Myers <bpm@sgi.com>2012-01-17 15:10:19 -0600
commit2813d682e8e6a278f94817429afd46b30875bb6e (patch)
treed865b04ec89076b692a922b7f5fced9be0458f47 /fs/xfs/xfs_file.c
parentce7ae151ddada3dbf67301464343c154903166b3 (diff)
downloadop-kernel-dev-2813d682e8e6a278f94817429afd46b30875bb6e.zip
op-kernel-dev-2813d682e8e6a278f94817429afd46b30875bb6e.tar.gz
xfs: remove the i_new_size field in struct xfs_inode
Now that we use the VFS i_size field throughout XFS there is no need for the i_new_size field any more given that the VFS i_size field gets updated in ->write_end before unlocking the page, and thus is always uptodate when writeback could see a page. Removing i_new_size also has the advantage that we will never have to trim back di_size during a failed buffered write, given that it never gets updated past i_size. Note that currently the generic direct I/O code only updates i_size after calling our end_io handler, which requires a small workaround to make sure di_size actually makes it to disk. I hope to fix this properly in the generic code. A downside is that we lose the support for parallel non-overlapping O_DIRECT appending writes that recently was added. I don't think keeping the complex and fragile i_new_size infrastructure for this is a good tradeoff - if we really care about parallel appending writers we should investigate turning the iolock into a range lock, which would also allow for parallel non-overlapping buffered writers. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_file.c')
-rw-r--r--fs/xfs/xfs_file.c72
1 files changed, 10 insertions, 62 deletions
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 86d5dc2..6323139 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -413,27 +413,6 @@ xfs_file_splice_read(
}
/*
- * If this was a direct or synchronous I/O that failed (such as ENOSPC) then
- * part of the I/O may have been written to disk before the error occurred. In
- * this case the on-disk file size may have been adjusted beyond the in-memory
- * file size and now needs to be truncated back.
- */
-STATIC void
-xfs_aio_write_newsize_update(
- struct xfs_inode *ip,
- xfs_fsize_t new_size)
-{
- if (new_size == ip->i_new_size) {
- xfs_rw_ilock(ip, XFS_ILOCK_EXCL);
- if (new_size == ip->i_new_size)
- ip->i_new_size = 0;
- if (ip->i_d.di_size > i_size_read(VFS_I(ip)))
- ip->i_d.di_size = i_size_read(VFS_I(ip));
- xfs_rw_iunlock(ip, XFS_ILOCK_EXCL);
- }
-}
-
-/*
* xfs_file_splice_write() does not use xfs_rw_ilock() because
* generic_file_splice_write() takes the i_mutex itself. This, in theory,
* couuld cause lock inversions between the aio_write path and the splice path
@@ -451,7 +430,6 @@ xfs_file_splice_write(
{
struct inode *inode = outfilp->f_mapping->host;
struct xfs_inode *ip = XFS_I(inode);
- xfs_fsize_t new_size;
int ioflags = 0;
ssize_t ret;
@@ -465,20 +443,12 @@ xfs_file_splice_write(
xfs_ilock(ip, XFS_IOLOCK_EXCL);
- new_size = *ppos + count;
-
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- if (new_size > i_size_read(inode))
- ip->i_new_size = new_size;
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
-
trace_xfs_file_splice_write(ip, count, *ppos, ioflags);
ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags);
if (ret > 0)
XFS_STATS_ADD(xs_write_bytes, ret);
- xfs_aio_write_newsize_update(ip, new_size);
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
return ret;
}
@@ -673,16 +643,13 @@ xfs_file_aio_write_checks(
struct file *file,
loff_t *pos,
size_t *count,
- xfs_fsize_t *new_sizep,
int *iolock)
{
struct inode *inode = file->f_mapping->host;
struct xfs_inode *ip = XFS_I(inode);
- xfs_fsize_t new_size;
int error = 0;
xfs_rw_ilock(ip, XFS_ILOCK_EXCL);
- *new_sizep = 0;
restart:
error = generic_write_checks(file, pos, count, S_ISBLK(inode->i_mode));
if (error) {
@@ -697,15 +664,13 @@ restart:
/*
* If the offset is beyond the size of the file, we need to zero any
* blocks that fall between the existing EOF and the start of this
- * write. There is no need to issue zeroing if another in-flght IO ends
- * at or before this one If zeronig is needed and we are currently
- * holding the iolock shared, we need to update it to exclusive which
- * involves dropping all locks and relocking to maintain correct locking
- * order. If we do this, restart the function to ensure all checks and
- * values are still valid.
+ * write. If zeroing is needed and we are currently holding the
+ * iolock shared, we need to update it to exclusive which involves
+ * dropping all locks and relocking to maintain correct locking order.
+ * If we do this, restart the function to ensure all checks and values
+ * are still valid.
*/
- if ((ip->i_new_size && *pos > ip->i_new_size) ||
- (!ip->i_new_size && *pos > i_size_read(inode))) {
+ if (*pos > i_size_read(inode)) {
if (*iolock == XFS_IOLOCK_SHARED) {
xfs_rw_iunlock(ip, XFS_ILOCK_EXCL | *iolock);
*iolock = XFS_IOLOCK_EXCL;
@@ -714,19 +679,6 @@ restart:
}
error = -xfs_zero_eof(ip, *pos, i_size_read(inode));
}
-
- /*
- * If this IO extends beyond EOF, we may need to update ip->i_new_size.
- * We have already zeroed space beyond EOF (if necessary). Only update
- * ip->i_new_size if this IO ends beyond any other in-flight writes.
- */
- new_size = *pos + *count;
- if (new_size > i_size_read(inode)) {
- if (new_size > ip->i_new_size)
- ip->i_new_size = new_size;
- *new_sizep = new_size;
- }
-
xfs_rw_iunlock(ip, XFS_ILOCK_EXCL);
if (error)
return error;
@@ -772,7 +724,6 @@ xfs_file_dio_aio_write(
unsigned long nr_segs,
loff_t pos,
size_t ocount,
- xfs_fsize_t *new_size,
int *iolock)
{
struct file *file = iocb->ki_filp;
@@ -817,7 +768,7 @@ xfs_file_dio_aio_write(
xfs_rw_ilock(ip, *iolock);
}
- ret = xfs_file_aio_write_checks(file, &pos, &count, new_size, iolock);
+ ret = xfs_file_aio_write_checks(file, &pos, &count, iolock);
if (ret)
return ret;
@@ -855,7 +806,6 @@ xfs_file_buffered_aio_write(
unsigned long nr_segs,
loff_t pos,
size_t ocount,
- xfs_fsize_t *new_size,
int *iolock)
{
struct file *file = iocb->ki_filp;
@@ -869,7 +819,7 @@ xfs_file_buffered_aio_write(
*iolock = XFS_IOLOCK_EXCL;
xfs_rw_ilock(ip, *iolock);
- ret = xfs_file_aio_write_checks(file, &pos, &count, new_size, iolock);
+ ret = xfs_file_aio_write_checks(file, &pos, &count, iolock);
if (ret)
return ret;
@@ -909,7 +859,6 @@ xfs_file_aio_write(
ssize_t ret;
int iolock;
size_t ocount = 0;
- xfs_fsize_t new_size = 0;
XFS_STATS_INC(xs_write_calls);
@@ -929,10 +878,10 @@ xfs_file_aio_write(
if (unlikely(file->f_flags & O_DIRECT))
ret = xfs_file_dio_aio_write(iocb, iovp, nr_segs, pos,
- ocount, &new_size, &iolock);
+ ocount, &iolock);
else
ret = xfs_file_buffered_aio_write(iocb, iovp, nr_segs, pos,
- ocount, &new_size, &iolock);
+ ocount, &iolock);
if (ret <= 0)
goto out_unlock;
@@ -953,7 +902,6 @@ xfs_file_aio_write(
}
out_unlock:
- xfs_aio_write_newsize_update(ip, new_size);
xfs_rw_iunlock(ip, iolock);
return ret;
}
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