#include <linux/obd_class.h>
#include <linux/lustre_fsfilt.h>
+#include <linux/lustre_smfs.h>
+#include <linux/lustre_snap.h>
#include "filter_internal.h"
static int filter_start_page_read(struct obd_device *obd, struct inode *inode,
lnb->page = page;
- if (inode->i_size < lnb->offset + lnb->len - 1)
- lnb->rc = inode->i_size - lnb->offset;
- else
- lnb->rc = lnb->len;
-
return 0;
}
GOTO(cleanup, rc);
}
+ if (inode->i_size < lnb->offset + lnb->len - 1)
+ lnb->rc = inode->i_size - lnb->offset;
+ else
+ lnb->rc = lnb->len;
+
tot_bytes += lnb->rc;
if (lnb->rc < lnb->len) {
/* short read, be sure to wait on it */
return rc;
}
-static int filter_start_page_write(struct inode *inode,
+static int filter_start_page_write(struct obd_device *obd, struct inode *inode,
struct niobuf_local *lnb)
{
- struct page *page = alloc_pages(GFP_HIGHUSER, 0);
+ struct page *page;
+
+ if (lnb->len != PAGE_SIZE)
+ return filter_start_page_read(obd, inode, lnb);
+
+ page = alloc_pages(GFP_HIGHUSER, 0);
if (page == NULL) {
CERROR("no memory for a temp page\n");
RETURN(lnb->rc = -ENOMEM);
}
+#if 0
POISON_PAGE(page, 0xf1);
if (lnb->len != PAGE_SIZE) {
memset(kmap(page) + lnb->len, 0, PAGE_SIZE - lnb->len);
kunmap(page);
}
+#endif
page->index = lnb->offset >> PAGE_SHIFT;
lnb->page = page;
return 0;
}
+static void filter_abort_page_write(struct niobuf_local *lnb)
+{
+ LASSERT(lnb->page != NULL);
+
+ if (lnb->len != PAGE_SIZE)
+ page_cache_release(lnb->page);
+ else
+ __free_pages(lnb->page, 0);
+}
+
+/* a helper for both the 2.4 and 2.6 commitrw paths which are both built
+ * up by our shared filter_preprw_write() */
+void filter_release_write_page(struct filter_obd *filter, struct inode *inode,
+ struct niobuf_local *lnb, int rc)
+{
+ if (lnb->len != PAGE_SIZE)
+ return filter_release_read_page(filter, inode, lnb->page);
+
+ if (rc == 0)
+ flip_into_page_cache(inode, lnb->page);
+ __free_page(lnb->page);
+}
+
/* If we ever start to support multi-object BRW RPCs, we will need to get locks
* on mulitple inodes. That isn't all, because there still exists the
* possibility of a truncate starting a new transaction while holding the ext3
lnb->len = rnb->len;
lnb->flags = rnb->flags;
- rc = filter_start_page_write(dentry->d_inode, lnb);
+ rc = filter_start_page_write(exp->exp_obd, dentry->d_inode,lnb);
if (rc) {
CERROR("page err %u@"LPU64" %u/%u %p: rc %d\n",
lnb->len, lnb->offset,
i, obj->ioo_bufcnt, dentry, rc);
while (lnb-- > res)
- __free_pages(lnb->page, 0);
+ filter_abort_page_write(lnb);
f_dput(dentry);
GOTO(cleanup, rc);
}
tot_bytes += lnb->len;
}
+ while (lnb-- > res) {
+ if (lnb->len == PAGE_SIZE)
+ continue;
+ rc = filter_finish_page_read(lnb);
+ if (rc) {
+ CERROR("error page %u@"LPU64" %u %p: rc %d\n", lnb->len,
+ lnb->offset, (int)(lnb - res), lnb->dentry, rc);
+ GOTO(cleanup, rc);
+ }
+ }
+
if (time_after(jiffies, now + 15 * HZ))
CERROR("slow start_page_write %lus\n", (jiffies - now) / HZ);
else
return -EPROTO;
}
+void filter_release_read_page(struct filter_obd *filter, struct inode *inode,
+ struct page *page)
+{
+ int drop = 0;
+
+ if (inode != NULL &&
+ (inode->i_size > filter->fo_readcache_max_filesize))
+ drop = 1;
+
+ /* drop from cache like truncate_list_pages() */
+ if (drop && !TryLockPage(page)) {
+ if (page->mapping)
+ ll_truncate_complete_page(page);
+ unlock_page(page);
+ }
+ page_cache_release(page);
+}
+
static int filter_commitrw_read(struct obd_export *exp, struct obdo *oa,
int objcount, struct obd_ioobj *obj,
int niocount, struct niobuf_local *res,
{
struct obd_ioobj *o;
struct niobuf_local *lnb;
- int i, j, drop = 0;
+ int i, j;
+ struct inode *inode = NULL;
ENTRY;
if (res->dentry != NULL)
- drop = (res->dentry->d_inode->i_size >
- exp->exp_obd->u.filter.fo_readcache_max_filesize);
+ inode = res->dentry->d_inode;
for (i = 0, o = obj, lnb = res; i < objcount; i++, o++) {
for (j = 0 ; j < o->ioo_bufcnt ; j++, lnb++) {
if (lnb->page == NULL)
continue;
- /* drop from cache like truncate_list_pages() */
- if (drop && !TryLockPage(lnb->page)) {
- if (lnb->page->mapping)
- ll_truncate_complete_page(lnb->page);
- unlock_page(lnb->page);
- }
- page_cache_release(lnb->page);
+ filter_release_read_page(&exp->exp_obd->u.filter,
+ inode, lnb->page);
}
}
spin_unlock(&exp->exp_obd->obd_osfs_lock);
}
+int filter_do_cow(struct obd_export *exp, struct obd_ioobj *obj,
+ int nioo, struct niobuf_remote *rnb)
+{
+ struct dentry *dentry;
+ struct lvfs_run_ctxt saved;
+ struct write_extents *extents = NULL;
+ int j, rc = 0, numexts = 0, flags = 0;
+
+ ENTRY;
+
+ LASSERT(nioo == 1);
+
+ push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
+
+ dentry = filter_fid2dentry(exp->exp_obd, NULL, obj->ioo_gr,
+ obj->ioo_id);
+ if (IS_ERR(dentry)) {
+ pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
+ RETURN (PTR_ERR(dentry));
+ }
+
+ if (dentry->d_inode == NULL) {
+ CERROR("trying to write extents to non-existent file "LPU64"\n",
+ obj->ioo_id);
+ GOTO(cleanup, rc = -ENOENT);
+ }
+
+ flags = fsfilt_get_fs_flags(exp->exp_obd, dentry);
+ if (!(flags & SM_DO_COW)) {
+ GOTO(cleanup, rc);
+ }
+ OBD_ALLOC(extents, obj->ioo_bufcnt * sizeof(struct write_extents));
+ if (!extents) {
+ CERROR("No Memory\n");
+ GOTO(cleanup, rc = -ENOMEM);
+ }
+ for (j = 0; j < obj->ioo_bufcnt; j++) {
+ if (rnb[j].len != 0) {
+ extents[numexts].w_count = rnb[j].len;
+ extents[numexts].w_pos = rnb[j].offset;
+ numexts++;
+ }
+ }
+ rc = fsfilt_do_write_cow(exp->exp_obd, dentry, extents, numexts);
+ if (rc) {
+ CERROR("Do cow error id "LPU64" rc:%d \n",
+ obj->ioo_id, rc);
+ GOTO(cleanup, rc);
+ }
+
+cleanup:
+ if (extents) {
+ OBD_FREE(extents, obj->ioo_bufcnt * sizeof(struct write_extents));
+ }
+ f_dput(dentry);
+ pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
+ RETURN(rc);
+
+}
+int filter_write_extents(struct obd_export *exp, struct obd_ioobj *obj, int nobj,
+ int niocount, struct niobuf_local *local, int rc)
+{
+ struct lvfs_run_ctxt saved;
+ struct dentry *dentry;
+ struct niobuf_local *lnb;
+ __u64 offset = 0;
+ __u32 len = 0;
+ int i, flags;
+
+ ENTRY;
+
+ LASSERT(nobj == 1);
+
+ push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
+
+ dentry = filter_fid2dentry(exp->exp_obd, NULL, obj->ioo_gr,
+ obj->ioo_id);
+ if (IS_ERR(dentry)) {
+ pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
+ RETURN (PTR_ERR(dentry));
+ }
+
+ if (dentry->d_inode == NULL) {
+ CERROR("trying to write extents to non-existent file "LPU64"\n",
+ obj->ioo_id);
+ GOTO(cleanup, rc = -ENOENT);
+ }
+
+ flags = fsfilt_get_fs_flags(exp->exp_obd, dentry);
+ if (!(flags & SM_DO_REC)) {
+ GOTO(cleanup, rc);
+ }
+
+ for (i = 0, lnb = local; i < obj->ioo_bufcnt; i++, lnb++) {
+ if (len == 0) {
+ offset = lnb->offset;
+ len = lnb->len;
+ } else if (lnb->offset == (offset + len)) {
+ len += lnb->len;
+ } else {
+ rc = fsfilt_write_extents(exp->exp_obd, dentry,
+ offset, len);
+ if (rc) {
+ CERROR("write exts off "LPU64" num %u rc:%d\n",
+ offset, len, rc);
+ GOTO(cleanup, rc);
+ }
+ offset = lnb->offset;
+ len = lnb->len;
+ }
+ }
+ if (len > 0) {
+ rc = fsfilt_write_extents(exp->exp_obd, dentry,
+ offset, len);
+ if (rc) {
+ CERROR("write exts off "LPU64" num %u rc:%d\n",
+ offset, len, rc);
+ GOTO(cleanup, rc);
+ }
+ }
+cleanup:
+ f_dput(dentry);
+ pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
+ RETURN(rc);
+}
int filter_commitrw(int cmd, struct obd_export *exp, struct obdo *oa,
int objcount, struct obd_ioobj *obj, int niocount,
git://git.whamcloud.com / fs / lustre-release.git / blobdiff