exofs: dbg-print less
[linux-2.6.git] / fs / exofs / inode.c
index b0bda1e..01fa798 100644 (file)
@@ -1,8 +1,6 @@
 /*
  * Copyright (C) 2005, 2006
- * Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
- * Copyright (C) 2005, 2006
- * International Business Machines
+ * Avishay Traeger (avishay@gmail.com)
  * Copyright (C) 2008, 2009
  * Boaz Harrosh <bharrosh@panasas.com>
  *
@@ -35,6 +33,7 @@
 
 #include <linux/writeback.h>
 #include <linux/buffer_head.h>
+#include <scsi/scsi_device.h>
 
 #include "exofs.h"
 
 #  define EXOFS_DEBUG_OBJ_ISIZE 1
 #endif
 
+#define EXOFS_DBGMSG2(M...) do {} while (0)
+
+struct page_collect {
+       struct exofs_sb_info *sbi;
+       struct request_queue *req_q;
+       struct inode *inode;
+       unsigned expected_pages;
+
+       struct bio *bio;
+       unsigned nr_pages;
+       unsigned long length;
+       loff_t pg_first; /* keep 64bit also in 32-arches */
+};
+
+static void _pcol_init(struct page_collect *pcol, unsigned expected_pages,
+               struct inode *inode)
+{
+       struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
+
+       pcol->sbi = sbi;
+       pcol->req_q = osd_request_queue(sbi->s_dev);
+       pcol->inode = inode;
+       pcol->expected_pages = expected_pages;
+
+       pcol->bio = NULL;
+       pcol->nr_pages = 0;
+       pcol->length = 0;
+       pcol->pg_first = -1;
+
+       EXOFS_DBGMSG("_pcol_init ino=0x%lx expected_pages=%u\n", inode->i_ino,
+                    expected_pages);
+}
+
+static void _pcol_reset(struct page_collect *pcol)
+{
+       pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages);
+
+       pcol->bio = NULL;
+       pcol->nr_pages = 0;
+       pcol->length = 0;
+       pcol->pg_first = -1;
+       EXOFS_DBGMSG("_pcol_reset ino=0x%lx expected_pages=%u\n",
+                    pcol->inode->i_ino, pcol->expected_pages);
+
+       /* this is probably the end of the loop but in writes
+        * it might not end here. don't be left with nothing
+        */
+       if (!pcol->expected_pages)
+               pcol->expected_pages = 128;
+}
+
+static int pcol_try_alloc(struct page_collect *pcol)
+{
+       int pages = min_t(unsigned, pcol->expected_pages, BIO_MAX_PAGES);
+
+       for (; pages; pages >>= 1) {
+               pcol->bio = bio_alloc(GFP_KERNEL, pages);
+               if (likely(pcol->bio))
+                       return 0;
+       }
+
+       EXOFS_ERR("Failed to kcalloc expected_pages=%u\n",
+                 pcol->expected_pages);
+       return -ENOMEM;
+}
+
+static void pcol_free(struct page_collect *pcol)
+{
+       bio_put(pcol->bio);
+       pcol->bio = NULL;
+}
+
+static int pcol_add_page(struct page_collect *pcol, struct page *page,
+                        unsigned len)
+{
+       int added_len = bio_add_pc_page(pcol->req_q, pcol->bio, page, len, 0);
+       if (unlikely(len != added_len))
+               return -ENOMEM;
+
+       ++pcol->nr_pages;
+       pcol->length += len;
+       return 0;
+}
+
+static int update_read_page(struct page *page, int ret)
+{
+       if (ret == 0) {
+               /* Everything is OK */
+               SetPageUptodate(page);
+               if (PageError(page))
+                       ClearPageError(page);
+       } else if (ret == -EFAULT) {
+               /* In this case we were trying to read something that wasn't on
+                * disk yet - return a page full of zeroes.  This should be OK,
+                * because the object should be empty (if there was a write
+                * before this read, the read would be waiting with the page
+                * locked */
+               clear_highpage(page);
+
+               SetPageUptodate(page);
+               if (PageError(page))
+                       ClearPageError(page);
+               ret = 0; /* recovered error */
+               EXOFS_DBGMSG("recovered read error\n");
+       } else /* Error */
+               SetPageError(page);
+
+       return ret;
+}
+
+static void update_write_page(struct page *page, int ret)
+{
+       if (ret) {
+               mapping_set_error(page->mapping, ret);
+               SetPageError(page);
+       }
+       end_page_writeback(page);
+}
+
+/* Called at the end of reads, to optionally unlock pages and update their
+ * status.
+ */
+static int __readpages_done(struct osd_request *or, struct page_collect *pcol,
+                           bool do_unlock)
+{
+       struct bio_vec *bvec;
+       int i;
+       u64 resid;
+       u64 good_bytes;
+       u64 length = 0;
+       int ret = exofs_check_ok_resid(or, &resid, NULL);
+
+       osd_end_request(or);
+
+       if (likely(!ret))
+               good_bytes = pcol->length;
+       else if (!resid)
+               good_bytes = 0;
+       else
+               good_bytes = pcol->length - resid;
+
+       EXOFS_DBGMSG("readpages_done(0x%lx) good_bytes=0x%llx"
+                    " length=0x%lx nr_pages=%u\n",
+                    pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
+                    pcol->nr_pages);
+
+       __bio_for_each_segment(bvec, pcol->bio, i, 0) {
+               struct page *page = bvec->bv_page;
+               struct inode *inode = page->mapping->host;
+               int page_stat;
+
+               if (inode != pcol->inode)
+                       continue; /* osd might add more pages at end */
+
+               if (likely(length < good_bytes))
+                       page_stat = 0;
+               else
+                       page_stat = ret;
+
+               EXOFS_DBGMSG2("    readpages_done(0x%lx, 0x%lx) %s\n",
+                         inode->i_ino, page->index,
+                         page_stat ? "bad_bytes" : "good_bytes");
+
+               ret = update_read_page(page, page_stat);
+               if (do_unlock)
+                       unlock_page(page);
+               length += bvec->bv_len;
+       }
+
+       pcol_free(pcol);
+       EXOFS_DBGMSG("readpages_done END\n");
+       return ret;
+}
+
+/* callback of async reads */
+static void readpages_done(struct osd_request *or, void *p)
+{
+       struct page_collect *pcol = p;
+
+       __readpages_done(or, pcol, true);
+       atomic_dec(&pcol->sbi->s_curr_pending);
+       kfree(p);
+}
+
+static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw)
+{
+       struct bio_vec *bvec;
+       int i;
+
+       __bio_for_each_segment(bvec, pcol->bio, i, 0) {
+               struct page *page = bvec->bv_page;
+
+               if (rw == READ)
+                       update_read_page(page, ret);
+               else
+                       update_write_page(page, ret);
+
+               unlock_page(page);
+       }
+       pcol_free(pcol);
+}
+
+static int read_exec(struct page_collect *pcol, bool is_sync)
+{
+       struct exofs_i_info *oi = exofs_i(pcol->inode);
+       struct osd_obj_id obj = {pcol->sbi->s_pid,
+                                       pcol->inode->i_ino + EXOFS_OBJ_OFF};
+       struct osd_request *or = NULL;
+       struct page_collect *pcol_copy = NULL;
+       loff_t i_start = pcol->pg_first << PAGE_CACHE_SHIFT;
+       int ret;
+
+       if (!pcol->bio)
+               return 0;
+
+       /* see comment in _readpage() about sync reads */
+       WARN_ON(is_sync && (pcol->nr_pages != 1));
+
+       or = osd_start_request(pcol->sbi->s_dev, GFP_KERNEL);
+       if (unlikely(!or)) {
+               ret = -ENOMEM;
+               goto err;
+       }
+
+       osd_req_read(or, &obj, i_start, pcol->bio, pcol->length);
+
+       if (is_sync) {
+               exofs_sync_op(or, pcol->sbi->s_timeout, oi->i_cred);
+               return __readpages_done(or, pcol, false);
+       }
+
+       pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
+       if (!pcol_copy) {
+               ret = -ENOMEM;
+               goto err;
+       }
+
+       *pcol_copy = *pcol;
+       ret = exofs_async_op(or, readpages_done, pcol_copy, oi->i_cred);
+       if (unlikely(ret))
+               goto err;
+
+       atomic_inc(&pcol->sbi->s_curr_pending);
+
+       EXOFS_DBGMSG("read_exec obj=0x%llx start=0x%llx length=0x%lx\n",
+                 obj.id, _LLU(i_start), pcol->length);
+
+       /* pages ownership was passed to pcol_copy */
+       _pcol_reset(pcol);
+       return 0;
+
+err:
+       if (!is_sync)
+               _unlock_pcol_pages(pcol, ret, READ);
+       else /* Pages unlocked by caller in sync mode only free bio */
+               pcol_free(pcol);
+
+       kfree(pcol_copy);
+       if (or)
+               osd_end_request(or);
+       return ret;
+}
+
+/* readpage_strip is called either directly from readpage() or by the VFS from
+ * within read_cache_pages(), to add one more page to be read. It will try to
+ * collect as many contiguous pages as posible. If a discontinuity is
+ * encountered, or it runs out of resources, it will submit the previous segment
+ * and will start a new collection. Eventually caller must submit the last
+ * segment if present.
+ */
+static int readpage_strip(void *data, struct page *page)
+{
+       struct page_collect *pcol = data;
+       struct inode *inode = pcol->inode;
+       struct exofs_i_info *oi = exofs_i(inode);
+       loff_t i_size = i_size_read(inode);
+       pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
+       size_t len;
+       int ret;
+
+       /* FIXME: Just for debugging, will be removed */
+       if (PageUptodate(page))
+               EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino,
+                         page->index);
+
+       if (page->index < end_index)
+               len = PAGE_CACHE_SIZE;
+       else if (page->index == end_index)
+               len = i_size & ~PAGE_CACHE_MASK;
+       else
+               len = 0;
+
+       if (!len || !obj_created(oi)) {
+               /* this will be out of bounds, or doesn't exist yet.
+                * Current page is cleared and the request is split
+                */
+               clear_highpage(page);
+
+               SetPageUptodate(page);
+               if (PageError(page))
+                       ClearPageError(page);
+
+               unlock_page(page);
+               EXOFS_DBGMSG("readpage_strip(0x%lx, 0x%lx) empty page,"
+                            " splitting\n", inode->i_ino, page->index);
+
+               return read_exec(pcol, false);
+       }
+
+try_again:
+
+       if (unlikely(pcol->pg_first == -1)) {
+               pcol->pg_first = page->index;
+       } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
+                  page->index)) {
+               /* Discontinuity detected, split the request */
+               ret = read_exec(pcol, false);
+               if (unlikely(ret))
+                       goto fail;
+               goto try_again;
+       }
+
+       if (!pcol->bio) {
+               ret = pcol_try_alloc(pcol);
+               if (unlikely(ret))
+                       goto fail;
+       }
+
+       if (len != PAGE_CACHE_SIZE)
+               zero_user(page, len, PAGE_CACHE_SIZE - len);
+
+       EXOFS_DBGMSG2("    readpage_strip(0x%lx, 0x%lx) len=0x%zx\n",
+                    inode->i_ino, page->index, len);
+
+       ret = pcol_add_page(pcol, page, len);
+       if (ret) {
+               EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p "
+                         "this_len=0x%zx nr_pages=%u length=0x%lx\n",
+                         page, len, pcol->nr_pages, pcol->length);
+
+               /* split the request, and start again with current page */
+               ret = read_exec(pcol, false);
+               if (unlikely(ret))
+                       goto fail;
+
+               goto try_again;
+       }
+
+       return 0;
+
+fail:
+       /* SetPageError(page); ??? */
+       unlock_page(page);
+       return ret;
+}
+
+static int exofs_readpages(struct file *file, struct address_space *mapping,
+                          struct list_head *pages, unsigned nr_pages)
+{
+       struct page_collect pcol;
+       int ret;
+
+       _pcol_init(&pcol, nr_pages, mapping->host);
+
+       ret = read_cache_pages(mapping, pages, readpage_strip, &pcol);
+       if (ret) {
+               EXOFS_ERR("read_cache_pages => %d\n", ret);
+               return ret;
+       }
+
+       return read_exec(&pcol, false);
+}
+
+static int _readpage(struct page *page, bool is_sync)
+{
+       struct page_collect pcol;
+       int ret;
+
+       _pcol_init(&pcol, 1, page->mapping->host);
+
+       /* readpage_strip might call read_exec(,async) inside at several places
+        * but this is safe for is_async=0 since read_exec will not do anything
+        * when we have a single page.
+        */
+       ret = readpage_strip(&pcol, page);
+       if (ret) {
+               EXOFS_ERR("_readpage => %d\n", ret);
+               return ret;
+       }
+
+       return read_exec(&pcol, is_sync);
+}
+
+/*
+ * We don't need the file
+ */
+static int exofs_readpage(struct file *file, struct page *page)
+{
+       return _readpage(page, false);
+}
+
+/* Callback for osd_write. All writes are asynchronouse */
+static void writepages_done(struct osd_request *or, void *p)
+{
+       struct page_collect *pcol = p;
+       struct bio_vec *bvec;
+       int i;
+       u64 resid;
+       u64  good_bytes;
+       u64  length = 0;
+
+       int ret = exofs_check_ok_resid(or, NULL, &resid);
+
+       osd_end_request(or);
+       atomic_dec(&pcol->sbi->s_curr_pending);
+
+       if (likely(!ret))
+               good_bytes = pcol->length;
+       else if (!resid)
+               good_bytes = 0;
+       else
+               good_bytes = pcol->length - resid;
+
+       EXOFS_DBGMSG("writepages_done(0x%lx) good_bytes=0x%llx"
+                    " length=0x%lx nr_pages=%u\n",
+                    pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
+                    pcol->nr_pages);
+
+       __bio_for_each_segment(bvec, pcol->bio, i, 0) {
+               struct page *page = bvec->bv_page;
+               struct inode *inode = page->mapping->host;
+               int page_stat;
+
+               if (inode != pcol->inode)
+                       continue; /* osd might add more pages to a bio */
+
+               if (likely(length < good_bytes))
+                       page_stat = 0;
+               else
+                       page_stat = ret;
+
+               update_write_page(page, page_stat);
+               unlock_page(page);
+               EXOFS_DBGMSG2("    writepages_done(0x%lx, 0x%lx) status=%d\n",
+                            inode->i_ino, page->index, page_stat);
+
+               length += bvec->bv_len;
+       }
+
+       pcol_free(pcol);
+       kfree(pcol);
+       EXOFS_DBGMSG("writepages_done END\n");
+}
+
+static int write_exec(struct page_collect *pcol)
+{
+       struct exofs_i_info *oi = exofs_i(pcol->inode);
+       struct osd_obj_id obj = {pcol->sbi->s_pid,
+                                       pcol->inode->i_ino + EXOFS_OBJ_OFF};
+       struct osd_request *or = NULL;
+       struct page_collect *pcol_copy = NULL;
+       loff_t i_start = pcol->pg_first << PAGE_CACHE_SHIFT;
+       int ret;
+
+       if (!pcol->bio)
+               return 0;
+
+       or = osd_start_request(pcol->sbi->s_dev, GFP_KERNEL);
+       if (unlikely(!or)) {
+               EXOFS_ERR("write_exec: Faild to osd_start_request()\n");
+               ret = -ENOMEM;
+               goto err;
+       }
+
+       pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
+       if (!pcol_copy) {
+               EXOFS_ERR("write_exec: Faild to kmalloc(pcol)\n");
+               ret = -ENOMEM;
+               goto err;
+       }
+
+       *pcol_copy = *pcol;
+
+       pcol_copy->bio->bi_rw |= (1 << BIO_RW); /* FIXME: bio_set_dir() */
+       osd_req_write(or, &obj, i_start, pcol_copy->bio, pcol_copy->length);
+       ret = exofs_async_op(or, writepages_done, pcol_copy, oi->i_cred);
+       if (unlikely(ret)) {
+               EXOFS_ERR("write_exec: exofs_async_op() Faild\n");
+               goto err;
+       }
+
+       atomic_inc(&pcol->sbi->s_curr_pending);
+       EXOFS_DBGMSG("write_exec(0x%lx, 0x%llx) start=0x%llx length=0x%lx\n",
+                 pcol->inode->i_ino, pcol->pg_first, _LLU(i_start),
+                 pcol->length);
+       /* pages ownership was passed to pcol_copy */
+       _pcol_reset(pcol);
+       return 0;
+
+err:
+       _unlock_pcol_pages(pcol, ret, WRITE);
+       kfree(pcol_copy);
+       if (or)
+               osd_end_request(or);
+       return ret;
+}
+
+/* writepage_strip is called either directly from writepage() or by the VFS from
+ * within write_cache_pages(), to add one more page to be written to storage.
+ * It will try to collect as many contiguous pages as possible. If a
+ * discontinuity is encountered or it runs out of resources it will submit the
+ * previous segment and will start a new collection.
+ * Eventually caller must submit the last segment if present.
+ */
+static int writepage_strip(struct page *page,
+                          struct writeback_control *wbc_unused, void *data)
+{
+       struct page_collect *pcol = data;
+       struct inode *inode = pcol->inode;
+       struct exofs_i_info *oi = exofs_i(inode);
+       loff_t i_size = i_size_read(inode);
+       pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
+       size_t len;
+       int ret;
+
+       BUG_ON(!PageLocked(page));
+
+       ret = wait_obj_created(oi);
+       if (unlikely(ret))
+               goto fail;
+
+       if (page->index < end_index)
+               /* in this case, the page is within the limits of the file */
+               len = PAGE_CACHE_SIZE;
+       else {
+               len = i_size & ~PAGE_CACHE_MASK;
+
+               if (page->index > end_index || !len) {
+                       /* in this case, the page is outside the limits
+                        * (truncate in progress)
+                        */
+                       ret = write_exec(pcol);
+                       if (unlikely(ret))
+                               goto fail;
+                       if (PageError(page))
+                               ClearPageError(page);
+                       unlock_page(page);
+                       return 0;
+               }
+       }
+
+try_again:
+
+       if (unlikely(pcol->pg_first == -1)) {
+               pcol->pg_first = page->index;
+       } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
+                  page->index)) {
+               /* Discontinuity detected, split the request */
+               ret = write_exec(pcol);
+               if (unlikely(ret))
+                       goto fail;
+               goto try_again;
+       }
+
+       if (!pcol->bio) {
+               ret = pcol_try_alloc(pcol);
+               if (unlikely(ret))
+                       goto fail;
+       }
+
+       EXOFS_DBGMSG2("    writepage_strip(0x%lx, 0x%lx) len=0x%zx\n",
+                    inode->i_ino, page->index, len);
+
+       ret = pcol_add_page(pcol, page, len);
+       if (unlikely(ret)) {
+               EXOFS_DBGMSG("Failed pcol_add_page "
+                            "nr_pages=%u total_length=0x%lx\n",
+                            pcol->nr_pages, pcol->length);
+
+               /* split the request, next loop will start again */
+               ret = write_exec(pcol);
+               if (unlikely(ret)) {
+                       EXOFS_DBGMSG("write_exec faild => %d", ret);
+                       goto fail;
+               }
+
+               goto try_again;
+       }
+
+       BUG_ON(PageWriteback(page));
+       set_page_writeback(page);
+
+       return 0;
+
+fail:
+       set_bit(AS_EIO, &page->mapping->flags);
+       unlock_page(page);
+       return ret;
+}
+
+static int exofs_writepages(struct address_space *mapping,
+                      struct writeback_control *wbc)
+{
+       struct page_collect pcol;
+       long start, end, expected_pages;
+       int ret;
+
+       start = wbc->range_start >> PAGE_CACHE_SHIFT;
+       end = (wbc->range_end == LLONG_MAX) ?
+                       start + mapping->nrpages :
+                       wbc->range_end >> PAGE_CACHE_SHIFT;
+
+       if (start || end)
+               expected_pages = min(end - start + 1, 32L);
+       else
+               expected_pages = mapping->nrpages;
+
+       EXOFS_DBGMSG("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx"
+                    " m->nrpages=%lu start=0x%lx end=0x%lx\n",
+                    mapping->host->i_ino, wbc->range_start, wbc->range_end,
+                    mapping->nrpages, start, end);
+
+       _pcol_init(&pcol, expected_pages, mapping->host);
+
+       ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol);
+       if (ret) {
+               EXOFS_ERR("write_cache_pages => %d\n", ret);
+               return ret;
+       }
+
+       return write_exec(&pcol);
+}
+
+static int exofs_writepage(struct page *page, struct writeback_control *wbc)
+{
+       struct page_collect pcol;
+       int ret;
+
+       _pcol_init(&pcol, 1, page->mapping->host);
+
+       ret = writepage_strip(page, NULL, &pcol);
+       if (ret) {
+               EXOFS_ERR("exofs_writepage => %d\n", ret);
+               return ret;
+       }
+
+       return write_exec(&pcol);
+}
+
+int exofs_write_begin(struct file *file, struct address_space *mapping,
+               loff_t pos, unsigned len, unsigned flags,
+               struct page **pagep, void **fsdata)
+{
+       int ret = 0;
+       struct page *page;
+
+       page = *pagep;
+       if (page == NULL) {
+               ret = simple_write_begin(file, mapping, pos, len, flags, pagep,
+                                        fsdata);
+               if (ret) {
+                       EXOFS_DBGMSG("simple_write_begin faild\n");
+                       return ret;
+               }
+
+               page = *pagep;
+       }
+
+        /* read modify write */
+       if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
+               ret = _readpage(page, true);
+               if (ret) {
+                       /*SetPageError was done by _readpage. Is it ok?*/
+                       unlock_page(page);
+                       EXOFS_DBGMSG("__readpage_filler faild\n");
+               }
+       }
+
+       return ret;
+}
+
+static int exofs_write_begin_export(struct file *file,
+               struct address_space *mapping,
+               loff_t pos, unsigned len, unsigned flags,
+               struct page **pagep, void **fsdata)
+{
+       *pagep = NULL;
+
+       return exofs_write_begin(file, mapping, pos, len, flags, pagep,
+                                       fsdata);
+}
+
+const struct address_space_operations exofs_aops = {
+       .readpage       = exofs_readpage,
+       .readpages      = exofs_readpages,
+       .writepage      = exofs_writepage,
+       .writepages     = exofs_writepages,
+       .write_begin    = exofs_write_begin_export,
+       .write_end      = simple_write_end,
+};
+
 /******************************************************************************
  * INODE OPERATIONS
  *****************************************************************************/
@@ -146,3 +846,460 @@ int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
        error = inode_setattr(inode, iattr);
        return error;
 }
+
+/*
+ * Read an inode from the OSD, and return it as is.  We also return the size
+ * attribute in the 'sanity' argument if we got compiled with debugging turned
+ * on.
+ */
+static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
+                   struct exofs_fcb *inode, uint64_t *sanity)
+{
+       struct exofs_sb_info *sbi = sb->s_fs_info;
+       struct osd_request *or;
+       struct osd_attr attr;
+       struct osd_obj_id obj = {sbi->s_pid,
+                                oi->vfs_inode.i_ino + EXOFS_OBJ_OFF};
+       int ret;
+
+       exofs_make_credential(oi->i_cred, &obj);
+
+       or = osd_start_request(sbi->s_dev, GFP_KERNEL);
+       if (unlikely(!or)) {
+               EXOFS_ERR("exofs_get_inode: osd_start_request failed.\n");
+               return -ENOMEM;
+       }
+       osd_req_get_attributes(or, &obj);
+
+       /* we need the inode attribute */
+       osd_req_add_get_attr_list(or, &g_attr_inode_data, 1);
+
+#ifdef EXOFS_DEBUG_OBJ_ISIZE
+       /* we get the size attributes to do a sanity check */
+       osd_req_add_get_attr_list(or, &g_attr_logical_length, 1);
+#endif
+
+       ret = exofs_sync_op(or, sbi->s_timeout, oi->i_cred);
+       if (ret)
+               goto out;
+
+       attr = g_attr_inode_data;
+       ret = extract_attr_from_req(or, &attr);
+       if (ret) {
+               EXOFS_ERR("exofs_get_inode: extract_attr_from_req failed\n");
+               goto out;
+       }
+
+       WARN_ON(attr.len != EXOFS_INO_ATTR_SIZE);
+       memcpy(inode, attr.val_ptr, EXOFS_INO_ATTR_SIZE);
+
+#ifdef EXOFS_DEBUG_OBJ_ISIZE
+       attr = g_attr_logical_length;
+       ret = extract_attr_from_req(or, &attr);
+       if (ret) {
+               EXOFS_ERR("ERROR: extract attr from or failed\n");
+               goto out;
+       }
+       *sanity = get_unaligned_be64(attr.val_ptr);
+#endif
+
+out:
+       osd_end_request(or);
+       return ret;
+}
+
+/*
+ * Fill in an inode read from the OSD and set it up for use
+ */
+struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
+{
+       struct exofs_i_info *oi;
+       struct exofs_fcb fcb;
+       struct inode *inode;
+       uint64_t uninitialized_var(sanity);
+       int ret;
+
+       inode = iget_locked(sb, ino);
+       if (!inode)
+               return ERR_PTR(-ENOMEM);
+       if (!(inode->i_state & I_NEW))
+               return inode;
+       oi = exofs_i(inode);
+
+       /* read the inode from the osd */
+       ret = exofs_get_inode(sb, oi, &fcb, &sanity);
+       if (ret)
+               goto bad_inode;
+
+       init_waitqueue_head(&oi->i_wq);
+       set_obj_created(oi);
+
+       /* copy stuff from on-disk struct to in-memory struct */
+       inode->i_mode = le16_to_cpu(fcb.i_mode);
+       inode->i_uid = le32_to_cpu(fcb.i_uid);
+       inode->i_gid = le32_to_cpu(fcb.i_gid);
+       inode->i_nlink = le16_to_cpu(fcb.i_links_count);
+       inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime);
+       inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime);
+       inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime);
+       inode->i_ctime.tv_nsec =
+               inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0;
+       oi->i_commit_size = le64_to_cpu(fcb.i_size);
+       i_size_write(inode, oi->i_commit_size);
+       inode->i_blkbits = EXOFS_BLKSHIFT;
+       inode->i_generation = le32_to_cpu(fcb.i_generation);
+
+#ifdef EXOFS_DEBUG_OBJ_ISIZE
+       if ((inode->i_size != sanity) &&
+               (!exofs_inode_is_fast_symlink(inode))) {
+               EXOFS_ERR("WARNING: Size of inode=%llu != object=%llu\n",
+                         inode->i_size, _LLU(sanity));
+       }
+#endif
+
+       oi->i_dir_start_lookup = 0;
+
+       if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
+               ret = -ESTALE;
+               goto bad_inode;
+       }
+
+       if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
+               if (fcb.i_data[0])
+                       inode->i_rdev =
+                               old_decode_dev(le32_to_cpu(fcb.i_data[0]));
+               else
+                       inode->i_rdev =
+                               new_decode_dev(le32_to_cpu(fcb.i_data[1]));
+       } else {
+               memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data));
+       }
+
+       if (S_ISREG(inode->i_mode)) {
+               inode->i_op = &exofs_file_inode_operations;
+               inode->i_fop = &exofs_file_operations;
+               inode->i_mapping->a_ops = &exofs_aops;
+       } else if (S_ISDIR(inode->i_mode)) {
+               inode->i_op = &exofs_dir_inode_operations;
+               inode->i_fop = &exofs_dir_operations;
+               inode->i_mapping->a_ops = &exofs_aops;
+       } else if (S_ISLNK(inode->i_mode)) {
+               if (exofs_inode_is_fast_symlink(inode))
+                       inode->i_op = &exofs_fast_symlink_inode_operations;
+               else {
+                       inode->i_op = &exofs_symlink_inode_operations;
+                       inode->i_mapping->a_ops = &exofs_aops;
+               }
+       } else {
+               inode->i_op = &exofs_special_inode_operations;
+               if (fcb.i_data[0])
+                       init_special_inode(inode, inode->i_mode,
+                          old_decode_dev(le32_to_cpu(fcb.i_data[0])));
+               else
+                       init_special_inode(inode, inode->i_mode,
+                          new_decode_dev(le32_to_cpu(fcb.i_data[1])));
+       }
+
+       unlock_new_inode(inode);
+       return inode;
+
+bad_inode:
+       iget_failed(inode);
+       return ERR_PTR(ret);
+}
+
+int __exofs_wait_obj_created(struct exofs_i_info *oi)
+{
+       if (!obj_created(oi)) {
+               BUG_ON(!obj_2bcreated(oi));
+               wait_event(oi->i_wq, obj_created(oi));
+       }
+       return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0;
+}
+/*
+ * Callback function from exofs_new_inode().  The important thing is that we
+ * set the obj_created flag so that other methods know that the object exists on
+ * the OSD.
+ */
+static void create_done(struct osd_request *or, void *p)
+{
+       struct inode *inode = p;
+       struct exofs_i_info *oi = exofs_i(inode);
+       struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
+       int ret;
+
+       ret = exofs_check_ok(or);
+       osd_end_request(or);
+       atomic_dec(&sbi->s_curr_pending);
+
+       if (unlikely(ret)) {
+               EXOFS_ERR("object=0x%llx creation faild in pid=0x%llx",
+                         _LLU(sbi->s_pid), _LLU(inode->i_ino + EXOFS_OBJ_OFF));
+               make_bad_inode(inode);
+       } else
+               set_obj_created(oi);
+
+       atomic_dec(&inode->i_count);
+       wake_up(&oi->i_wq);
+}
+
+/*
+ * Set up a new inode and create an object for it on the OSD
+ */
+struct inode *exofs_new_inode(struct inode *dir, int mode)
+{
+       struct super_block *sb;
+       struct inode *inode;
+       struct exofs_i_info *oi;
+       struct exofs_sb_info *sbi;
+       struct osd_request *or;
+       struct osd_obj_id obj;
+       int ret;
+
+       sb = dir->i_sb;
+       inode = new_inode(sb);
+       if (!inode)
+               return ERR_PTR(-ENOMEM);
+
+       oi = exofs_i(inode);
+
+       init_waitqueue_head(&oi->i_wq);
+       set_obj_2bcreated(oi);
+
+       sbi = sb->s_fs_info;
+
+       sb->s_dirt = 1;
+       inode->i_uid = current->cred->fsuid;
+       if (dir->i_mode & S_ISGID) {
+               inode->i_gid = dir->i_gid;
+               if (S_ISDIR(mode))
+                       mode |= S_ISGID;
+       } else {
+               inode->i_gid = current->cred->fsgid;
+       }
+       inode->i_mode = mode;
+
+       inode->i_ino = sbi->s_nextid++;
+       inode->i_blkbits = EXOFS_BLKSHIFT;
+       inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
+       oi->i_commit_size = inode->i_size = 0;
+       spin_lock(&sbi->s_next_gen_lock);
+       inode->i_generation = sbi->s_next_generation++;
+       spin_unlock(&sbi->s_next_gen_lock);
+       insert_inode_hash(inode);
+
+       mark_inode_dirty(inode);
+
+       obj.partition = sbi->s_pid;
+       obj.id = inode->i_ino + EXOFS_OBJ_OFF;
+       exofs_make_credential(oi->i_cred, &obj);
+
+       or = osd_start_request(sbi->s_dev, GFP_KERNEL);
+       if (unlikely(!or)) {
+               EXOFS_ERR("exofs_new_inode: osd_start_request failed\n");
+               return ERR_PTR(-ENOMEM);
+       }
+
+       osd_req_create_object(or, &obj);
+
+       /* increment the refcount so that the inode will still be around when we
+        * reach the callback
+        */
+       atomic_inc(&inode->i_count);
+
+       ret = exofs_async_op(or, create_done, inode, oi->i_cred);
+       if (ret) {
+               atomic_dec(&inode->i_count);
+               osd_end_request(or);
+               return ERR_PTR(-EIO);
+       }
+       atomic_inc(&sbi->s_curr_pending);
+
+       return inode;
+}
+
+/*
+ * struct to pass two arguments to update_inode's callback
+ */
+struct updatei_args {
+       struct exofs_sb_info    *sbi;
+       struct exofs_fcb        fcb;
+};
+
+/*
+ * Callback function from exofs_update_inode().
+ */
+static void updatei_done(struct osd_request *or, void *p)
+{
+       struct updatei_args *args = p;
+
+       osd_end_request(or);
+
+       atomic_dec(&args->sbi->s_curr_pending);
+
+       kfree(args);
+}
+
+/*
+ * Write the inode to the OSD.  Just fill up the struct, and set the attribute
+ * synchronously or asynchronously depending on the do_sync flag.
+ */
+static int exofs_update_inode(struct inode *inode, int do_sync)
+{
+       struct exofs_i_info *oi = exofs_i(inode);
+       struct super_block *sb = inode->i_sb;
+       struct exofs_sb_info *sbi = sb->s_fs_info;
+       struct osd_obj_id obj = {sbi->s_pid, inode->i_ino + EXOFS_OBJ_OFF};
+       struct osd_request *or;
+       struct osd_attr attr;
+       struct exofs_fcb *fcb;
+       struct updatei_args *args;
+       int ret;
+
+       args = kzalloc(sizeof(*args), GFP_KERNEL);
+       if (!args)
+               return -ENOMEM;
+
+       fcb = &args->fcb;
+
+       fcb->i_mode = cpu_to_le16(inode->i_mode);
+       fcb->i_uid = cpu_to_le32(inode->i_uid);
+       fcb->i_gid = cpu_to_le32(inode->i_gid);
+       fcb->i_links_count = cpu_to_le16(inode->i_nlink);
+       fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
+       fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
+       fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
+       oi->i_commit_size = i_size_read(inode);
+       fcb->i_size = cpu_to_le64(oi->i_commit_size);
+       fcb->i_generation = cpu_to_le32(inode->i_generation);
+
+       if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
+               if (old_valid_dev(inode->i_rdev)) {
+                       fcb->i_data[0] =
+                               cpu_to_le32(old_encode_dev(inode->i_rdev));
+                       fcb->i_data[1] = 0;
+               } else {
+                       fcb->i_data[0] = 0;
+                       fcb->i_data[1] =
+                               cpu_to_le32(new_encode_dev(inode->i_rdev));
+                       fcb->i_data[2] = 0;
+               }
+       } else
+               memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data));
+
+       or = osd_start_request(sbi->s_dev, GFP_KERNEL);
+       if (unlikely(!or)) {
+               EXOFS_ERR("exofs_update_inode: osd_start_request failed.\n");
+               ret = -ENOMEM;
+               goto free_args;
+       }
+
+       osd_req_set_attributes(or, &obj);
+
+       attr = g_attr_inode_data;
+       attr.val_ptr = fcb;
+       osd_req_add_set_attr_list(or, &attr, 1);
+
+       if (!obj_created(oi)) {
+               EXOFS_DBGMSG("!obj_created\n");
+               BUG_ON(!obj_2bcreated(oi));
+               wait_event(oi->i_wq, obj_created(oi));
+               EXOFS_DBGMSG("wait_event done\n");
+       }
+
+       if (do_sync) {
+               ret = exofs_sync_op(or, sbi->s_timeout, oi->i_cred);
+               osd_end_request(or);
+               goto free_args;
+       } else {
+               args->sbi = sbi;
+
+               ret = exofs_async_op(or, updatei_done, args, oi->i_cred);
+               if (ret) {
+                       osd_end_request(or);
+                       goto free_args;
+               }
+               atomic_inc(&sbi->s_curr_pending);
+               goto out; /* deallocation in updatei_done */
+       }
+
+free_args:
+       kfree(args);
+out:
+       EXOFS_DBGMSG("ret=>%d\n", ret);
+       return ret;
+}
+
+int exofs_write_inode(struct inode *inode, int wait)
+{
+       return exofs_update_inode(inode, wait);
+}
+
+/*
+ * Callback function from exofs_delete_inode() - don't have much cleaning up to
+ * do.
+ */
+static void delete_done(struct osd_request *or, void *p)
+{
+       struct exofs_sb_info *sbi;
+       osd_end_request(or);
+       sbi = p;
+       atomic_dec(&sbi->s_curr_pending);
+}
+
+/*
+ * Called when the refcount of an inode reaches zero.  We remove the object
+ * from the OSD here.  We make sure the object was created before we try and
+ * delete it.
+ */
+void exofs_delete_inode(struct inode *inode)
+{
+       struct exofs_i_info *oi = exofs_i(inode);
+       struct super_block *sb = inode->i_sb;
+       struct exofs_sb_info *sbi = sb->s_fs_info;
+       struct osd_obj_id obj = {sbi->s_pid, inode->i_ino + EXOFS_OBJ_OFF};
+       struct osd_request *or;
+       int ret;
+
+       truncate_inode_pages(&inode->i_data, 0);
+
+       if (is_bad_inode(inode))
+               goto no_delete;
+
+       mark_inode_dirty(inode);
+       exofs_update_inode(inode, inode_needs_sync(inode));
+
+       inode->i_size = 0;
+       if (inode->i_blocks)
+               exofs_truncate(inode);
+
+       clear_inode(inode);
+
+       or = osd_start_request(sbi->s_dev, GFP_KERNEL);
+       if (unlikely(!or)) {
+               EXOFS_ERR("exofs_delete_inode: osd_start_request failed\n");
+               return;
+       }
+
+       osd_req_remove_object(or, &obj);
+
+       /* if we are deleting an obj that hasn't been created yet, wait */
+       if (!obj_created(oi)) {
+               BUG_ON(!obj_2bcreated(oi));
+               wait_event(oi->i_wq, obj_created(oi));
+       }
+
+       ret = exofs_async_op(or, delete_done, sbi, oi->i_cred);
+       if (ret) {
+               EXOFS_ERR(
+                      "ERROR: @exofs_delete_inode exofs_async_op failed\n");
+               osd_end_request(or);
+               return;
+       }
+       atomic_inc(&sbi->s_curr_pending);
+
+       return;
+
+no_delete:
+       clear_inode(inode);
+}