* (sct@redhat.com), 1993, 1998
*/
-#include <linux/aio.h>
#include "ext4_jbd2.h"
#include "truncate.h"
+#include <linux/uio.h>
#include <trace/events/ext4.h>
* crashes then stale disk data _may_ be exposed inside the file. But current
* VFS code falls back into buffered path in that case so we are safe.
*/
-ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
- struct iov_iter *iter, loff_t offset)
+ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
+ loff_t offset)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
size_t count = iov_iter_count(iter);
int retries = 0;
- if (rw == WRITE) {
+ if (iov_iter_rw(iter) == WRITE) {
loff_t final_size = offset + count;
if (final_size > inode->i_size) {
}
retry:
- if (rw == READ && ext4_should_dioread_nolock(inode)) {
+ if (iov_iter_rw(iter) == READ && ext4_should_dioread_nolock(inode)) {
/*
* Nolock dioread optimization may be dynamically disabled
* via ext4_inode_block_unlocked_dio(). Check inode's state
* while holding extra i_dio_count ref.
*/
- atomic_inc(&inode->i_dio_count);
+ inode_dio_begin(inode);
smp_mb();
if (unlikely(ext4_test_inode_state(inode,
EXT4_STATE_DIOREAD_LOCK))) {
- inode_dio_done(inode);
+ inode_dio_end(inode);
goto locked;
}
if (IS_DAX(inode))
- ret = dax_do_io(rw, iocb, inode, iter, offset,
+ ret = dax_do_io(iocb, inode, iter, offset,
ext4_get_block, NULL, 0);
else
- ret = __blockdev_direct_IO(rw, iocb, inode,
- inode->i_sb->s_bdev, iter, offset,
- ext4_get_block, NULL, NULL, 0);
- inode_dio_done(inode);
+ ret = __blockdev_direct_IO(iocb, inode,
+ inode->i_sb->s_bdev, iter,
+ offset, ext4_get_block, NULL,
+ NULL, 0);
+ inode_dio_end(inode);
} else {
locked:
if (IS_DAX(inode))
- ret = dax_do_io(rw, iocb, inode, iter, offset,
+ ret = dax_do_io(iocb, inode, iter, offset,
ext4_get_block, NULL, DIO_LOCKING);
else
- ret = blockdev_direct_IO(rw, iocb, inode, iter,
- offset, ext4_get_block);
+ ret = blockdev_direct_IO(iocb, inode, iter, offset,
+ ext4_get_block);
- if (unlikely((rw & WRITE) && ret < 0)) {
+ if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
loff_t isize = i_size_read(inode);
loff_t end = offset + count;
* to free. Everything was covered by the start
* of the range.
*/
- return 0;
- } else {
- /* Shared branch grows from an indirect block */
- partial2--;
+ goto do_indirects;
}
} else {
/*
/* Punch happened within the same level (n == n2) */
partial = ext4_find_shared(inode, n, offsets, chain, &nr);
partial2 = ext4_find_shared(inode, n2, offsets2, chain2, &nr2);
- /*
- * ext4_find_shared returns Indirect structure which
- * points to the last element which should not be
- * removed by truncate. But this is end of the range
- * in punch_hole so we need to point to the next element
- */
- partial2->p++;
- while ((partial > chain) || (partial2 > chain2)) {
- /* We're at the same block, so we're almost finished */
- if ((partial->bh && partial2->bh) &&
- (partial->bh->b_blocknr == partial2->bh->b_blocknr)) {
- if ((partial > chain) && (partial2 > chain2)) {
+
+ /* Free top, but only if partial2 isn't its subtree. */
+ if (nr) {
+ int level = min(partial - chain, partial2 - chain2);
+ int i;
+ int subtree = 1;
+
+ for (i = 0; i <= level; i++) {
+ if (offsets[i] != offsets2[i]) {
+ subtree = 0;
+ break;
+ }
+ }
+
+ if (!subtree) {
+ if (partial == chain) {
+ /* Shared branch grows from the inode */
+ ext4_free_branches(handle, inode, NULL,
+ &nr, &nr+1,
+ (chain+n-1) - partial);
+ *partial->p = 0;
+ } else {
+ /* Shared branch grows from an indirect block */
+ BUFFER_TRACE(partial->bh, "get_write_access");
ext4_free_branches(handle, inode, partial->bh,
- partial->p + 1,
- partial2->p,
+ partial->p,
+ partial->p+1,
(chain+n-1) - partial);
- BUFFER_TRACE(partial->bh, "call brelse");
- brelse(partial->bh);
- BUFFER_TRACE(partial2->bh, "call brelse");
- brelse(partial2->bh);
}
- return 0;
}
+ }
+
+ if (!nr2) {
/*
- * Clear the ends of indirect blocks on the shared branch
- * at the start of the range
+ * ext4_find_shared returns Indirect structure which
+ * points to the last element which should not be
+ * removed by truncate. But this is end of the range
+ * in punch_hole so we need to point to the next element
*/
- if (partial > chain) {
+ partial2->p++;
+ }
+
+ while (partial > chain || partial2 > chain2) {
+ int depth = (chain+n-1) - partial;
+ int depth2 = (chain2+n2-1) - partial2;
+
+ if (partial > chain && partial2 > chain2 &&
+ partial->bh->b_blocknr == partial2->bh->b_blocknr) {
+ /*
+ * We've converged on the same block. Clear the range,
+ * then we're done.
+ */
ext4_free_branches(handle, inode, partial->bh,
- partial->p + 1,
- (__le32 *)partial->bh->b_data+addr_per_block,
- (chain+n-1) - partial);
+ partial->p + 1,
+ partial2->p,
+ (chain+n-1) - partial);
BUFFER_TRACE(partial->bh, "call brelse");
brelse(partial->bh);
- partial--;
+ BUFFER_TRACE(partial2->bh, "call brelse");
+ brelse(partial2->bh);
+ return 0;
}
+
/*
- * Clear the ends of indirect blocks on the shared branch
- * at the end of the range
+ * The start and end partial branches may not be at the same
+ * level even though the punch happened within one level. So, we
+ * give them a chance to arrive at the same level, then walk
+ * them in step with each other until we converge on the same
+ * block.
*/
- if (partial2 > chain2) {
+ if (partial > chain && depth <= depth2) {
+ ext4_free_branches(handle, inode, partial->bh,
+ partial->p + 1,
+ (__le32 *)partial->bh->b_data+addr_per_block,
+ (chain+n-1) - partial);
+ BUFFER_TRACE(partial->bh, "call brelse");
+ brelse(partial->bh);
+ partial--;
+ }
+ if (partial2 > chain2 && depth2 <= depth) {
ext4_free_branches(handle, inode, partial2->bh,
(__le32 *)partial2->bh->b_data,
partial2->p,
- (chain2+n-1) - partial2);
+ (chain2+n2-1) - partial2);
BUFFER_TRACE(partial2->bh, "call brelse");
brelse(partial2->bh);
partial2--;
}
}
+ return 0;
do_indirects:
/* Kill the remaining (whole) subtrees */
projects / deliverable / linux.git / blobdiff