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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_aops.c
parentce7ae151ddada3dbf67301464343c154903166b3 (diff)
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_aops.c')
-rw-r--r--fs/xfs/xfs_aops.c29
1 files changed, 16 insertions, 13 deletions
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 4d27ea117e0e..74b9baf36ac3 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -111,8 +111,7 @@ xfs_ioend_new_eof(
xfs_fsize_t bsize;
bsize = ioend->io_offset + ioend->io_size;
- isize = MAX(i_size_read(VFS_I(ip)), ip->i_new_size);
- isize = MIN(isize, bsize);
+ isize = MIN(i_size_read(VFS_I(ip)), bsize);
return isize > ip->i_d.di_size ? isize : 0;
}
@@ -126,11 +125,7 @@ static inline bool xfs_ioend_is_append(struct xfs_ioend *ioend)
}
/*
- * Update on-disk file size now that data has been written to disk. The
- * current in-memory file size is i_size. If a write is beyond eof i_new_size
- * will be the intended file size until i_size is updated. If this write does
- * not extend all the way to the valid file size then restrict this update to
- * the end of the write.
+ * Update on-disk file size now that data has been written to disk.
*
* This function does not block as blocking on the inode lock in IO completion
* can lead to IO completion order dependency deadlocks.. If it can't get the
@@ -1279,6 +1274,15 @@ xfs_end_io_direct_write(
struct xfs_ioend *ioend = iocb->private;
/*
+ * While the generic direct I/O code updates the inode size, it does
+ * so only after the end_io handler is called, which means our
+ * end_io handler thinks the on-disk size is outside the in-core
+ * size. To prevent this just update it a little bit earlier here.
+ */
+ if (offset + size > i_size_read(ioend->io_inode))
+ i_size_write(ioend->io_inode, offset + size);
+
+ /*
* blockdev_direct_IO can return an error even after the I/O
* completion handler was called. Thus we need to protect
* against double-freeing.
@@ -1340,12 +1344,11 @@ xfs_vm_write_failed(
if (to > inode->i_size) {
/*
- * punch out the delalloc blocks we have already allocated. We
- * don't call xfs_setattr() to do this as we may be in the
- * middle of a multi-iovec write and so the vfs inode->i_size
- * will not match the xfs ip->i_size and so it will zero too
- * much. Hence we jus truncate the page cache to zero what is
- * necessary and punch the delalloc blocks directly.
+ * Punch out the delalloc blocks we have already allocated.
+ *
+ * Don't bother with xfs_setattr given that nothing can have
+ * made it to disk yet as the page is still locked at this
+ * point.
*/
struct xfs_inode *ip = XFS_I(inode);
xfs_fileoff_t start_fsb;