[PATCH 071/102] xfs: push the ilock into xfs_zero_eof

Dave Chinner
2012-08-23T05:04:20Z

From: Christoph Hellwig <hch@infradead.org>

Upstream commit: 193aec10504e4c24521449c46317282141fb36e8

Instead of calling xfs_zero_eof with the ilock held only take it internally
for the minimall required critical section around xfs_bmapi_read. This
also requires changing the calling convention for xfs_zero_last_block
slightly. The actual zeroing operation is still serialized by the iolock,
which must be taken exclusively over the call to xfs_zero_eof.

We could in fact use a shared lock for the xfs_bmapi_read calls as long as
the extent list has been read in, but given that we already hold the iolock
exclusively there is little reason to micro optimize this further.

Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
---
fs/xfs/linux-2.6/xfs_file.c | 164 +++++++++++++++++--------------------------
fs/xfs/xfs_vnodeops.c | 2 -
2 files changed, 64 insertions(+), 102 deletions(-)

diff --git a/fs/xfs/linux-2.6/xfs_file.c b/fs/xfs/linux-2.6/xfs_file.c
index d0239cf..642554b8 100644
--- a/fs/xfs/linux-2.6/xfs_file.c
+++ b/fs/xfs/linux-2.6/xfs_file.c
@@ -390,116 +390,99 @@ xfs_file_splice_write(
}

/*
- * This routine is called to handle zeroing any space in the last
- * block of the file that is beyond the EOF. We do this since the
- * size is being increased without writing anything to that block
- * and we don't want anyone to read the garbage on the disk.
+ * This routine is called to handle zeroing any space in the last block of the
+ * file that is beyond the EOF. We do this since the size is being increased
+ * without writing anything to that block and we don't want to read the
+ * garbage on the disk.
*/
STATIC int /* error (positive) */
xfs_zero_last_block(
- xfs_inode_t *ip,
- xfs_fsize_t offset,
- xfs_fsize_t isize)
+ struct xfs_inode *ip,
+ xfs_fsize_t offset,
+ xfs_fsize_t isize)
{
- xfs_fileoff_t last_fsb;
- xfs_mount_t *mp = ip->i_mount;
- int nimaps;
- int zero_offset;
- int zero_len;
- int error = 0;
- xfs_bmbt_irec_t imap;
-
- ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
-
- zero_offset = XFS_B_FSB_OFFSET(mp, isize);
- if (zero_offset == 0) {
- /*
- * There are no extra bytes in the last block on disk to
- * zero, so return.
- */
- return 0;
- }
+ struct xfs_mount *mp = ip->i_mount;
+ xfs_fileoff_t last_fsb = XFS_B_TO_FSBT(mp, isize);
+ int zero_offset = XFS_B_FSB_OFFSET(mp, isize);
+ int zero_len;
+ int nimaps = 1;
+ int error = 0;
+ struct xfs_bmbt_irec imap;

+ xfs_ilock(ip, XFS_ILOCK_EXCL);
last_fsb = XFS_B_TO_FSBT(mp, isize);
nimaps = 1;
error = xfs_bmapi(NULL, ip, last_fsb, 1, 0, NULL, 0, &imap,
&nimaps, NULL);
- if (error) {
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ if (error)
return error;
- }
+
ASSERT(nimaps > 0);
+
/*
* If the block underlying isize is just a hole, then there
* is nothing to zero.
*/
- if (imap.br_startblock == HOLESTARTBLOCK) {
+ if (imap.br_startblock == HOLESTARTBLOCK)
return 0;
- }
- /*
- * Zero the part of the last block beyond the EOF, and write it
- * out sync. We need to drop the ilock while we do this so we
- * don't deadlock when the buffer cache calls back to us.
- */
- xfs_iunlock(ip, XFS_ILOCK_EXCL);

zero_len = mp->m_sb.sb_blocksize - zero_offset;
if (isize + zero_len > offset)
zero_len = offset - isize;
- error = xfs_iozero(ip, isize, zero_len);
-
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- ASSERT(error >= 0);
- return error;
+ return xfs_iozero(ip, isize, zero_len);
}

/*
- * Zero any on disk space between the current EOF and the new,
- * larger EOF. This handles the normal case of zeroing the remainder
- * of the last block in the file and the unusual case of zeroing blocks
- * out beyond the size of the file. This second case only happens
- * with fixed size extents and when the system crashes before the inode
- * size was updated but after blocks were allocated. If fill is set,
- * then any holes in the range are filled and zeroed. If not, the holes
- * are left alone as holes.
+ * Zero any on disk space between the current EOF and the new, larger EOF.
+ *
+ * This handles the normal case of zeroing the remainder of the last block in
+ * the file and the unusual case of zeroing blocks out beyond the size of the
+ * file. This second case only happens with fixed size extents and when the
+ * system crashes before the inode size was updated but after blocks were
+ * allocated.
+ *
+ * Expects the iolock to be held exclusive, and will take the ilock internally.
*/
-
int /* error (positive) */
xfs_zero_eof(
- xfs_inode_t *ip,
- xfs_off_t offset, /* starting I/O offset */
- xfs_fsize_t isize) /* current inode size */
+ struct xfs_inode *ip,
+ xfs_off_t offset, /* starting I/O offset */
+ xfs_fsize_t isize) /* current inode size */
{
- xfs_mount_t *mp = ip->i_mount;
- xfs_fileoff_t start_zero_fsb;
- xfs_fileoff_t end_zero_fsb;
- xfs_fileoff_t zero_count_fsb;
- xfs_fileoff_t last_fsb;
- xfs_fileoff_t zero_off;
- xfs_fsize_t zero_len;
- int nimaps;
- int error = 0;
- xfs_bmbt_irec_t imap;
-
- ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
+ struct xfs_mount *mp = ip->i_mount;
+ xfs_fileoff_t start_zero_fsb;
+ xfs_fileoff_t end_zero_fsb;
+ xfs_fileoff_t zero_count_fsb;
+ xfs_fileoff_t last_fsb;
+ xfs_fileoff_t zero_off;
+ xfs_fsize_t zero_len;
+ int nimaps;
+ int error = 0;
+ struct xfs_bmbt_irec imap;
+
+ ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
ASSERT(offset > isize);

/*
* First handle zeroing the block on which isize resides.
+ *
* We only zero a part of that block so it is handled specially.
*/
- error = xfs_zero_last_block(ip, offset, isize);
- if (error) {
- ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
- return error;
+ if (XFS_B_FSB_OFFSET(mp, isize) != 0) {
+ error = xfs_zero_last_block(ip, offset, isize);
+ if (error)
+ return error;
}

/*
- * Calculate the range between the new size and the old
- * where blocks needing to be zeroed may exist. To get the
- * block where the last byte in the file currently resides,
- * we need to subtract one from the size and truncate back
- * to a block boundary. We subtract 1 in case the size is
- * exactly on a block boundary.
+ * Calculate the range between the new size and the old where blocks
+ * needing to be zeroed may exist.
+ *
+ * To get the block where the last byte in the file currently resides,
+ * we need to subtract one from the size and truncate back to a block
+ * boundary. We subtract 1 in case the size is exactly on a block
+ * boundary.
*/
last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1;
start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
@@ -517,23 +500,18 @@ xfs_zero_eof(
while (start_zero_fsb <= end_zero_fsb) {
nimaps = 1;
zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
error = xfs_bmapi(NULL, ip, start_zero_fsb, zero_count_fsb,
0, NULL, 0, &imap, &nimaps, NULL);
- if (error) {
- ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ if (error)
return error;
- }
+
ASSERT(nimaps > 0);

if (imap.br_state == XFS_EXT_UNWRITTEN ||
imap.br_startblock == HOLESTARTBLOCK) {
- /*
- * This loop handles initializing pages that were
- * partially initialized by the code below this
- * loop. It basically zeroes the part of the page
- * that sits on a hole and sets the page as P_HOLE
- * and calls remapf if it is a mapped file.
- */
start_zero_fsb = imap.br_startoff + imap.br_blockcount;
ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
continue;
@@ -541,11 +519,7 @@ xfs_zero_eof(

/*
* There are blocks we need to zero.
- * Drop the inode lock while we're doing the I/O.
- * We'll still have the iolock to protect us.
*/
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
-
zero_off = XFS_FSB_TO_B(mp, start_zero_fsb);
zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount);

@@ -553,22 +527,14 @@ xfs_zero_eof(
zero_len = offset - zero_off;

error = xfs_iozero(ip, zero_off, zero_len);
- if (error) {
- goto out_lock;
- }
+ if (error)
+ return error;

start_zero_fsb = imap.br_startoff + imap.br_blockcount;
ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
-
- xfs_ilock(ip, XFS_ILOCK_EXCL);
}

return 0;
-
-out_lock:
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- ASSERT(error >= 0);
- return error;
}

/*
@@ -608,9 +574,7 @@ restart:
xfs_rw_ilock(ip, *iolock);
goto restart;
}
- xfs_rw_ilock(ip, XFS_ILOCK_EXCL);
error = -xfs_zero_eof(ip, *pos, i_size_read(inode));
- xfs_rw_iunlock(ip, XFS_ILOCK_EXCL);
if (error)
return error;
}
diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index b156e46..3988584 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -231,9 +231,7 @@ restart:
* need to do this before the inode is joined to the
* transaction to modify the i_size.
*/
- xfs_ilock(ip, XFS_ILOCK_EXCL);
code = xfs_zero_eof(ip, iattr->ia_size, old_size);
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
if (code)
goto error_return;