#include <inode.h>
#include <file.h>
-#include "llite_lib.h"
-
-#if 0
-void llu_pgcache_remove_extent(struct inode *inode, struct lov_stripe_md *lsm,
- struct ldlm_lock *lock)
-{
- clear_bit(LLI_F_HAVE_SIZE_LOCK, &(llu_i2info(inode)->lli_flags));
-#if 0
- struct ldlm_extent *extent = &lock->l_extent;
- unsigned long start, end, count, skip, i, j;
- struct page *page;
- int ret;
- ENTRY;
-
- CDEBUG(D_INODE, "obdo %lu inode %p ["LPU64"->"LPU64"] size: %llu\n",
- inode->i_ino, inode, extent->start, extent->end, inode->i_size);
-
- start = extent->start >> PAGE_CACHE_SHIFT;
- count = ~0;
- skip = 0;
- end = (extent->end >> PAGE_CACHE_SHIFT) + 1;
- if ((end << PAGE_CACHE_SHIFT) < extent->end)
- end = ~0;
- if (lsm->lsm_stripe_count > 1) {
- struct {
- char name[16];
- struct ldlm_lock *lock;
- struct lov_stripe_md *lsm;
- } key = { .name = "lock_to_stripe", .lock = lock, .lsm = lsm };
- __u32 stripe;
- __u32 vallen = sizeof(stripe);
- int rc;
-
- /* get our offset in the lov */
- rc = obd_get_info(ll_i2obdconn(inode), sizeof(key),
- &key, &vallen, &stripe);
- if (rc != 0) {
- CERROR("obd_get_info: rc = %d\n", rc);
- LBUG();
- }
- LASSERT(stripe < lsm->lsm_stripe_count);
-
- count = lsm->lsm_stripe_size >> PAGE_CACHE_SHIFT;
- skip = (lsm->lsm_stripe_count - 1) * count;
- start += (start/count * skip) + (stripe * count);
- if (end != ~0)
- end += (end/count * skip) + (stripe * count);
- }
-
- i = (inode->i_size + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT;
- if (end >= i)
- clear_bit(LLI_F_HAVE_SIZE_LOCK, &(ll_i2info(inode)->lli_flags));
- if (i < end)
- end = i;
-
- CDEBUG(D_INODE, "start: %lu j: %lu count: %lu skip: %lu end: %lu\n",
- start, start % count, count, skip, end);
-
- /* start writeback on dirty pages in the extent when its PW */
- for (i = start, j = start % count;
- lock->l_granted_mode == LCK_PW && i < end; j++, i++) {
- if (j == count) {
- i += skip;
- j = 0;
- }
- /* its unlikely, but give us a chance to bail when we're out */
- PGCACHE_WRLOCK(inode->i_mapping);
- if (list_empty(&inode->i_mapping->dirty_pages)) {
- CDEBUG(D_INODE, "dirty list empty\n");
- PGCACHE_WRUNLOCK(inode->i_mapping);
- break;
- }
- PGCACHE_WRUNLOCK(inode->i_mapping);
-
- if (need_resched())
- schedule();
-
- /* always do a getattr for the first person to pop out of lock
- * acquisition.. the DID_GETATTR flag and semaphore serialize
- * this initial race. we used to make a decision based on whether
- * the lock was matched or acquired, but the matcher could win the
- * waking race with the first issuer so that was no good..
- */
- if (test_bit(LLI_F_DID_GETATTR, &lli->lli_flags))
- RETURN(ELDLM_OK);
-
- down(&lli->lli_getattr_sem);
-
- if (!test_bit(LLI_F_DID_GETATTR, &lli->lli_flags)) {
- rc = ll_inode_getattr(inode, lsm);
- if (rc == 0) {
- set_bit(LLI_F_DID_GETATTR, &lli->lli_flags);
- } else {
- unlock_page(page);
- }
- page_cache_release(page);
-
- }
-
- /* our locks are page granular thanks to osc_enqueue, we invalidate the
- * whole page. */
- LASSERT((extent->start & ~PAGE_CACHE_MASK) == 0);
- LASSERT(((extent->end+1) & ~PAGE_CACHE_MASK) == 0);
- for (i = start, j = start % count ; i < end ; j++, i++) {
- if ( j == count ) {
- i += skip;
- j = 0;
- }
- PGCACHE_WRLOCK(inode->i_mapping);
- if (list_empty(&inode->i_mapping->dirty_pages) &&
- list_empty(&inode->i_mapping->clean_pages) &&
- list_empty(&inode->i_mapping->locked_pages)) {
- CDEBUG(D_INODE, "nothing left\n");
- PGCACHE_WRUNLOCK(inode->i_mapping);
- break;
- }
- PGCACHE_WRUNLOCK(inode->i_mapping);
- if (need_resched())
- schedule();
- page = find_get_page(inode->i_mapping, i);
- if (page == NULL)
- continue;
- CDEBUG(D_INODE, "dropping page %p at %lu\n", page, page->index);
- lock_page(page);
- if (page->mapping) /* might have raced */
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
- truncate_complete_page(page);
-#else
- truncate_complete_page(page->mapping, page);
-#endif
- unlock_page(page);
- page_cache_release(page);
- }
- EXIT;
-#endif
-}
-
-int llu_lock_callback(struct ldlm_lock *lock, struct ldlm_lock_desc *new,
- void *data, int flag)
-{
- struct inode *inode = data;
- struct llu_inode_info *lli = llu_i2info(inode);
- struct lustre_handle lockh = {0};
- int rc;
- ENTRY;
-
- if (inode == NULL)
- LBUG();
-
- switch (flag) {
- case LDLM_CB_BLOCKING:
- ldlm_lock2handle(lock, &lockh);
- rc = ldlm_cli_cancel(&lockh);
- if (rc != ELDLM_OK)
- CERROR("ldlm_cli_cancel failed: %d\n", rc);
- break;
- case LDLM_CB_CANCELING: {
- /* FIXME: we could be given 'canceling intents' so that we
- * could know to write-back or simply throw away the pages
- * based on if the cancel comes from a desire to, say,
- * read or truncate.. */
- llu_pgcache_remove_extent(inode, lli->lli_smd, lock);
- break;
- }
- default:
- LBUG();
- }
+#undef LIST_HEAD
- RETURN(0);
-}
-#endif
+#include "llite_lib.h"
static int llu_extent_lock_callback(struct ldlm_lock *lock,
struct ldlm_lock_desc *new, void *data,
LASSERT(lockh->cookie == 0);
-#if 0
/* XXX phil: can we do this? won't it screw the file size up? */
if ((fd && (fd->fd_flags & LL_FILE_IGNORE_LOCK)) ||
(sbi->ll_flags & LL_SBI_NOLCK))
RETURN(0);
-#endif
CDEBUG(D_DLMTRACE, "Locking inode %lu, start "LPU64" end "LPU64"\n",
lli->lli_st_ino, extent->start, extent->end);
};
static
-struct llu_sysio_cookie* get_sysio_cookie(struct inode *inode, int npages)
+struct llu_sysio_cookie* get_sysio_cookie(struct inode *inode, int maxpages)
{
struct llu_sysio_cookie *cookie;
- OBD_ALLOC(cookie, LLU_SYSIO_COOKIE_SIZE(npages));
+ OBD_ALLOC(cookie, LLU_SYSIO_COOKIE_SIZE(maxpages));
if (cookie) {
I_REF(inode);
cookie->lsc_inode = inode;
- cookie->lsc_npages = npages;
+ cookie->lsc_maxpages = maxpages;
cookie->lsc_llap = (struct ll_async_page *)(cookie + 1);
- cookie->lsc_pages = (struct page *) (cookie->lsc_llap + npages);
+ cookie->lsc_pages = (struct page *) (cookie->lsc_llap + maxpages);
osic_init(&cookie->lsc_osic);
}
struct lov_stripe_md *lsm = llu_i2info(cookie->lsc_inode)->lli_smd;
struct obd_export *exp = llu_i2obdexp(cookie->lsc_inode);
struct ll_async_page *llap = cookie->lsc_llap;
+#ifdef LIBLUSTRE_HANDLE_UNALIGNED_PAGE
+ struct page *pages = cookie->lsc_pages;
+#endif
int i;
- for (i = 0; i< cookie->lsc_npages; i++) {
+ for (i = 0; i< cookie->lsc_maxpages; i++) {
if (llap[i].llap_cookie)
obd_teardown_async_page(exp, lsm, NULL,
llap[i].llap_cookie);
+#ifdef LIBLUSTRE_HANDLE_UNALIGNED_PAGE
+ if (pages[i]._managed) {
+ free(pages[i].addr);
+ pages[i]._managed = 0;
+ }
+#endif
}
I_RELE(cookie->lsc_inode);
osic_release(cookie->lsc_osic);
- OBD_FREE(cookie, LLU_SYSIO_COOKIE_SIZE(cookie->lsc_npages));
+ OBD_FREE(cookie, LLU_SYSIO_COOKIE_SIZE(cookie->lsc_maxpages));
+}
+
+#ifdef LIBLUSTRE_HANDLE_UNALIGNED_PAGE
+/* Note: these code should be removed finally, don't need
+ * more cleanup
+ */
+static
+int prepare_unaligned_write(struct llu_sysio_cookie *cookie)
+{
+ struct inode *inode = cookie->lsc_inode;
+ struct llu_inode_info *lli = llu_i2info(inode);
+ struct lov_stripe_md *lsm = lli->lli_smd;
+ struct obdo oa;
+ struct page *pages = cookie->lsc_pages;
+ int i, pgidx[2] = {0, cookie->lsc_npages-1};
+ int rc;
+ ENTRY;
+
+ for (i = 0; i < 2; i++) {
+ struct page *oldpage = &pages[pgidx[i]];
+ struct page newpage;
+ struct brw_page pg;
+ char *newbuf;
+
+ if (i == 0 && pgidx[0] == pgidx[1])
+ continue;
+
+ LASSERT(oldpage->_offset + oldpage->_count <= PAGE_CACHE_SIZE);
+
+ if (oldpage->_count == PAGE_CACHE_SIZE)
+ continue;
+
+ if (oldpage->index << PAGE_CACHE_SHIFT >=
+ lli->lli_st_size)
+ continue;
+
+ newbuf = malloc(PAGE_CACHE_SIZE);
+ if (!newbuf)
+ return -ENOMEM;
+
+ newpage.index = oldpage->index;
+ newpage.addr = newbuf;
+
+ pg.pg = &newpage;
+ pg.off = ((obd_off)newpage.index << PAGE_CACHE_SHIFT);
+ if (pg.off + PAGE_CACHE_SIZE > lli->lli_st_size)
+ pg.count = lli->lli_st_size % PAGE_CACHE_SIZE;
+ else
+ pg.count = PAGE_CACHE_SIZE;
+ pg.flag = 0;
+
+ oa.o_id = lsm->lsm_object_id;
+ oa.o_mode = lli->lli_st_mode;
+ oa.o_valid = OBD_MD_FLID | OBD_MD_FLMODE | OBD_MD_FLTYPE;
+
+ /* issue read */
+ rc = obd_brw(OBD_BRW_READ, llu_i2obdexp(inode), &oa, lsm, 1, &pg, NULL);
+ if (rc) {
+ free(newbuf);
+ RETURN(rc);
+ }
+
+ /* copy page content, and reset page params */
+ memcpy(newbuf + oldpage->_offset,
+ (char*)oldpage->addr + oldpage->_offset,
+ oldpage->_count);
+
+ oldpage->addr = newbuf;
+ if ((((obd_off)oldpage->index << PAGE_CACHE_SHIFT) +
+ oldpage->_offset + oldpage->_count) > lli->lli_st_size)
+ oldpage->_count += oldpage->_offset;
+ else
+ oldpage->_count = PAGE_CACHE_SIZE;
+ oldpage->_offset = 0;
+ oldpage->_managed = 1;
+ }
+
+ RETURN(0);
}
+#endif
static
int llu_prep_async_io(struct llu_sysio_cookie *cookie, int cmd,
char *buf, loff_t pos, size_t count)
{
- struct lov_stripe_md *lsm = llu_i2info(cookie->lsc_inode)->lli_smd;
+ struct llu_inode_info *lli = llu_i2info(cookie->lsc_inode);
+ struct lov_stripe_md *lsm = lli->lli_smd;
struct obd_export *exp = llu_i2obdexp(cookie->lsc_inode);
struct page *pages = cookie->lsc_pages;
struct ll_async_page *llap = cookie->lsc_llap;
if (!exp)
RETURN(-EINVAL);
- cookie->lsc_rwcount = count;
-
/* prepare the pages array */
do {
unsigned long index, offset, bytes;
if (bytes > count)
bytes = count;
+ /* prevent read beyond file range */
+ if ((cmd == OBD_BRW_READ) &&
+ (pos + bytes) >= lli->lli_st_size) {
+ if (pos >= lli->lli_st_size)
+ break;
+ bytes = lli->lli_st_size - pos;
+ }
+
/* prepare page for this index */
pages[npages].index = index;
pages[npages].addr = buf - offset;
count -= bytes;
pos += bytes;
buf += bytes;
+
+ cookie->lsc_rwcount += bytes;
} while (count);
+ cookie->lsc_npages = npages;
+
+#ifdef LIBLUSTRE_HANDLE_UNALIGNED_PAGE
+ if (cmd == OBD_BRW_WRITE) {
+ rc = prepare_unaligned_write(cookie);
+ if (rc)
+ RETURN(rc);
+ }
+#endif
+
for (i = 0; i < npages; i++) {
llap[i].llap_magic = LLAP_MAGIC;
rc = obd_prep_async_page(exp, lsm, NULL, &pages[i],
/* FIXME optimize the following extent locking */
for (iovidx = 0; iovidx < iovlen; iovidx++) {
- char *buf = iovec[iovidx].iov_base;
+ char *buf = (char*)iovec[iovidx].iov_base;
size_t count = iovec[iovidx].iov_len;
if (count == 0)
continue;
- /* FIXME libsysio haven't consider the open flags
- * such as O_APPEND */
-#if 0
- if (!S_ISBLK(lli->lli_st_mode) && file->f_flags & O_APPEND) {
- extent.start = 0;
- extent.end = OBD_OBJECT_EOF;
- } else {
- extent.start = *ppos;
- extent.end = *ppos + count - 1;
- }
-#else
+ /* FIXME libsysio haven't handle O_APPEND */
extent.start = pos;
extent.end = pos + count - 1;
-#endif
- err = llu_extent_lock(fd, inode, lsm, LCK_PW, &extent, &lockh);
+#ifdef LIBLUSTRE_HANDLE_UNALIGNED_PAGE
+ if ((pos & ~PAGE_CACHE_MASK) == 0 &&
+ (count & ~PAGE_CACHE_MASK) == 0)
+ err = llu_extent_lock_no_validate(fd, inode, lsm,
+ LCK_PW, &extent, &lockh, 0);
+ else
+ err = llu_extent_lock(fd, inode, lsm, LCK_PW,
+ &extent, &lockh);
+#else
+ /* server will handle partial write, so we don't
+ * care for file size here */
+ err = llu_extent_lock_no_validate(fd, inode, lsm, LCK_PW,
+ &extent, &lockh, 0);
+#endif
if (err != ELDLM_OK)
GOTO(err_out, err = -ENOLCK);
CDEBUG(D_INFO, "Reading inode %lu, "LPSZ" bytes, offset %Ld\n",
lli->lli_st_ino, count, pos);
+ if (pos >= lli->lli_st_size) {
+ llu_extent_unlock(fd, inode, lsm, LCK_PR, &lockh);
+ break;
+ }
+
cookie = llu_rw(OBD_BRW_READ, inode, buf, count, pos);
if (!IS_ERR(cookie)) {
/* save cookie */
ENTRY;
/* write/read(fd, buf, 0) */
- if (!lsca)
- return 1;
+ if (!lsca) {
+ ioctxp->ioctx_cc = 0;
+ RETURN(1);
+ }
LASSERT(!IS_ERR(lsca));
}
}
- if (rc)
- ioctxp->ioctx_cc = rc;
+ if (rc) {
+ LASSERT(rc < 0);
+ ioctxp->ioctx_cc = -1;
+ ioctxp->ioctx_errno = -rc;
+ }
OBD_FREE(lsca, sizeof(*lsca));
ioctxp->ioctx_private = NULL;
git://git.whamcloud.com / fs / lustre-release.git / blobdiff