}
EXPORT_SYMBOL(zfs_link);
+static void
+zfs_putpage_commit_cb(void *arg, int error)
+{
+ struct page *pp = arg;
+
+ if (error) {
+ __set_page_dirty_nobuffers(pp);
+
+ if (error != ECANCELED)
+ SetPageError(pp);
+ } else {
+ ClearPageError(pp);
+ }
+
+ end_page_writeback(pp);
+}
+
/*
- * Push a page out to disk
- *
- * IN: vp - file to push page to.
- * pp - page to push.
- * off - start of range pushed.
- * len - len of range pushed.
+ * Push a page out to disk, once the page is on stable storage the
+ * registered commit callback will be run as notification of completion.
*
+ * IN: ip - page mapped for inode.
+ * pp - page to push (page is locked)
+ * wbc - writeback control data
*
* RETURN: 0 if success
* error code if failure
*
- * NOTE: callers must have locked the page to be pushed.
+ * Timestamps:
+ * ip - ctime|mtime updated
*/
/* ARGSUSED */
-static int
-zfs_putapage(struct inode *ip, struct page *pp, u_offset_t off, size_t len)
+int
+zfs_putpage(struct inode *ip, struct page *pp, struct writeback_control *wbc)
{
- znode_t *zp = ITOZ(ip);
- zfs_sb_t *zsb = ITOZSB(ip);
- dmu_tx_t *tx;
- caddr_t va;
- int err;
+ znode_t *zp = ITOZ(ip);
+ zfs_sb_t *zsb = ITOZSB(ip);
+ loff_t offset;
+ loff_t pgoff;
+ unsigned int pglen;
+ dmu_tx_t *tx;
+ caddr_t va;
+ int err = 0;
+ uint64_t mtime[2], ctime[2];
+ sa_bulk_attr_t bulk[3];
+ int cnt = 0;
+
+ ASSERT(PageLocked(pp));
+
+ pgoff = page_offset(pp); /* Page byte-offset in file */
+ offset = i_size_read(ip); /* File length in bytes */
+ pglen = MIN(PAGE_CACHE_SIZE, /* Page length in bytes */
+ P2ROUNDUP(offset, PAGE_CACHE_SIZE)-pgoff);
+
+ /* Page is beyond end of file */
+ if (pgoff >= offset) {
+ unlock_page(pp);
+ return (0);
+ }
+
+ /* Truncate page length to end of file */
+ if (pgoff + pglen > offset)
+ pglen = offset - pgoff;
+
+#if 0
/*
- * Can't push pages past end-of-file.
+ * FIXME: Allow mmap writes past its quota. The correct fix
+ * is to register a page_mkwrite() handler to count the page
+ * against its quota when it is about to be dirtied.
*/
- if (off >= zp->z_size) {
- /* ignore all pages */
- err = 0;
- goto out;
- } else if (off + len > zp->z_size)
- len = zp->z_size - off;
-
if (zfs_owner_overquota(zsb, zp, B_FALSE) ||
zfs_owner_overquota(zsb, zp, B_TRUE)) {
err = EDQUOT;
- goto out;
}
-top:
+#endif
+
+ set_page_writeback(pp);
+ unlock_page(pp);
+
tx = dmu_tx_create(zsb->z_os);
- dmu_tx_hold_write(tx, zp->z_id, off, len);
+
+ dmu_tx_callback_register(tx, zfs_putpage_commit_cb, pp);
+
+ dmu_tx_hold_write(tx, zp->z_id, pgoff, pglen);
dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
zfs_sa_upgrade_txholds(tx, zp);
err = dmu_tx_assign(tx, TXG_NOWAIT);
if (err != 0) {
- if (err == ERESTART) {
+ if (err == ERESTART)
dmu_tx_wait(tx);
- dmu_tx_abort(tx);
- goto top;
- }
+
dmu_tx_abort(tx);
- goto out;
+ return (err);
}
va = kmap(pp);
- ASSERT3U(len, <=, PAGESIZE);
- dmu_write(zsb->z_os, zp->z_id, off, len, va, tx);
+ ASSERT3U(pglen, <=, PAGE_CACHE_SIZE);
+ dmu_write(zsb->z_os, zp->z_id, pgoff, pglen, va, tx);
kunmap(pp);
- if (err == 0) {
- uint64_t mtime[2], ctime[2];
- sa_bulk_attr_t bulk[3];
- int count = 0;
+ SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MTIME(zsb), NULL, &mtime, 16);
+ SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_CTIME(zsb), NULL, &ctime, 16);
+ SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_FLAGS(zsb), NULL, &zp->z_pflags, 8);
+ zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, B_TRUE);
+ zfs_log_write(zsb->z_log, tx, TX_WRITE, zp, pgoff, pglen, 0);
- SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zsb), NULL,
- &mtime, 16);
- SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zsb), NULL,
- &ctime, 16);
- SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zsb), NULL,
- &zp->z_pflags, 8);
- zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime,
- B_TRUE);
- zfs_log_write(zsb->z_log, tx, TX_WRITE, zp, off, len, 0);
- }
dmu_tx_commit(tx);
+ ASSERT3S(err, ==, 0);
-out:
- return (err);
-}
-
-/*
- * Copy the portion of the file indicated from page into the file.
- *
- * IN: ip - inode of file to push page data to.
- * wbc - Unused parameter
- * data - pointer to address_space
- *
- * RETURN: 0 if success
- * error code if failure
- *
- * Timestamps:
- * vp - ctime|mtime updated
- */
-/*ARGSUSED*/
-int
-zfs_putpage(struct page *page, struct writeback_control *wbc, void *data)
-{
- struct address_space *mapping = data;
- struct inode *ip = mapping->host;
- znode_t *zp = ITOZ(ip);
- zfs_sb_t *zsb = ITOZSB(ip);
- u_offset_t io_off;
- size_t io_len;
- size_t len;
- int error;
-
- io_off = page_offset(page);
- io_len = PAGESIZE;
-
- ZFS_ENTER(zsb);
- ZFS_VERIFY_ZP(zp);
-
- if (io_off > zp->z_size) {
- /* past end of file */
- ZFS_EXIT(zsb);
- return (0);
- }
-
- len = MIN(io_len, P2ROUNDUP(zp->z_size, PAGESIZE) - io_off);
-
- error = zfs_putapage(ip, page, io_off, len);
-
- if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
+ if ((zsb->z_os->os_sync == ZFS_SYNC_ALWAYS) ||
+ (wbc->sync_mode == WB_SYNC_ALL))
zil_commit(zsb->z_log, zp->z_id);
- ZFS_EXIT(zsb);
- return (error);
+
+ return (err);
}
-EXPORT_SYMBOL(zfs_putpage);
/*ARGSUSED*/
void
git://git.camperquake.de / zfs.git / blobdiff