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-rw-r--r--fs/exofs/inode.c889
1 files changed, 889 insertions, 0 deletions
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
new file mode 100644
index 000000000000..80314258007d
--- /dev/null
+++ b/fs/exofs/inode.c
@@ -0,0 +1,889 @@
+/*
+ * Copyright (C) 2005, 2006
+ * Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
+ * Copyright (C) 2005, 2006
+ * International Business Machines
+ * Copyright (C) 2008, 2009
+ * Boaz Harrosh <bharrosh@panasas.com>
+ *
+ * Copyrights for code taken from ext2:
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ * from
+ * linux/fs/minix/inode.c
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ * This file is part of exofs.
+ *
+ * exofs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation. Since it is based on ext2, and the only
+ * valid version of GPL for the Linux kernel is version 2, the only valid
+ * version of GPL for exofs is version 2.
+ *
+ * exofs is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with exofs; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/writeback.h>
+#include <linux/buffer_head.h>
+
+#include "exofs.h"
+
+static int __readpage_filler(struct page *page, bool is_async_unlock);
+
+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);
+ page = *pagep;
+ }
+
+ /* read modify write */
+ if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE))
+ ret = __readpage_filler(page, false);
+
+ 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);
+}
+
+/*
+ * Callback function when writepage finishes. Check for errors, unlock, clean
+ * up, etc.
+ */
+static void writepage_done(struct osd_request *req, void *p)
+{
+ int ret;
+ struct page *page = p;
+ struct inode *inode = page->mapping->host;
+ struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
+
+ ret = exofs_check_ok(req);
+ free_osd_req(req);
+ atomic_dec(&sbi->s_curr_pending);
+
+ if (ret) {
+ if (ret == -ENOSPC)
+ set_bit(AS_ENOSPC, &page->mapping->flags);
+ else
+ set_bit(AS_EIO, &page->mapping->flags);
+
+ SetPageError(page);
+ }
+
+ end_page_writeback(page);
+ unlock_page(page);
+}
+
+/*
+ * Write a page to disk. page->index gives us the page number. The page is
+ * locked before this function is called. We write asynchronously and then the
+ * callback function (writepage_done) is called. We signify that the operation
+ * has completed by unlocking the page and calling end_page_writeback().
+ */
+static int exofs_writepage(struct page *page, struct writeback_control *wbc)
+{
+ struct inode *inode = page->mapping->host;
+ struct exofs_i_info *oi = exofs_i(inode);
+ loff_t i_size = i_size_read(inode);
+ unsigned long end_index = i_size >> PAGE_CACHE_SHIFT;
+ unsigned offset = 0;
+ struct osd_request *req = NULL;
+ struct exofs_sb_info *sbi;
+ uint64_t start;
+ uint64_t len = PAGE_CACHE_SIZE;
+ int ret = 0;
+
+ BUG_ON(!PageLocked(page));
+
+ /* if the object has not been created, and we are not in sync mode,
+ * just return. otherwise, wait. */
+ if (!obj_created(oi)) {
+ BUG_ON(!obj_2bcreated(oi));
+
+ if (wbc->sync_mode == WB_SYNC_NONE) {
+ redirty_page_for_writepage(wbc, page);
+ unlock_page(page);
+ ret = 0;
+ goto out;
+ } else
+ wait_event(oi->i_wq, obj_created(oi));
+ }
+
+ /* in this case, the page is within the limits of the file */
+ if (page->index < end_index)
+ goto do_it;
+
+ offset = i_size & (PAGE_CACHE_SIZE - 1);
+ len = offset;
+
+ /*in this case, the page is outside the limits (truncate in progress)*/
+ if (page->index >= end_index + 1 || !offset) {
+ unlock_page(page);
+ goto out;
+ }
+
+do_it:
+ BUG_ON(PageWriteback(page));
+ set_page_writeback(page);
+ start = page->index << PAGE_CACHE_SHIFT;
+ sbi = inode->i_sb->s_fs_info;
+
+ req = prepare_osd_write_pages(sbi->s_dev, sbi->s_pid,
+ inode->i_ino + EXOFS_OBJ_OFF, len, start,
+ &page, 1);
+ if (!req) {
+ EXOFS_ERR("ERROR: writepage failed.\n");
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ oi->i_commit_size = min_t(uint64_t, oi->i_commit_size, len + start);
+
+ ret = exofs_async_op(req, writepage_done, page, oi->i_cred);
+ if (ret) {
+ free_osd_req(req);
+ goto fail;
+ }
+ atomic_inc(&sbi->s_curr_pending);
+out:
+ return ret;
+fail:
+ set_bit(AS_EIO, &page->mapping->flags);
+ end_page_writeback(page);
+ unlock_page(page);
+ goto out;
+}
+
+/*
+ * Callback for readpage
+ */
+static int __readpage_done(struct osd_request *req, void *p, int unlock)
+{
+ struct page *page = p;
+ struct inode *inode = page->mapping->host;
+ struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
+ int ret;
+
+ ret = exofs_check_ok(req);
+ free_osd_req(req);
+ atomic_dec(&sbi->s_curr_pending);
+
+ 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);
+ } else /* Error */
+ SetPageError(page);
+
+ if (unlock)
+ unlock_page(page);
+
+ return ret;
+}
+
+static void readpage_done(struct osd_request *req, void *p)
+{
+ __readpage_done(req, p, true);
+}
+
+/*
+ * Read a page from the OSD
+ */
+static int __readpage_filler(struct page *page, bool is_async_unlock)
+{
+ struct osd_request *req = NULL;
+ struct inode *inode = page->mapping->host;
+ struct exofs_i_info *oi = exofs_i(inode);
+ ino_t ino = inode->i_ino;
+ loff_t i_size = i_size_read(inode);
+ loff_t i_start = page->index << PAGE_CACHE_SHIFT;
+ pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
+ struct super_block *sb = inode->i_sb;
+ struct exofs_sb_info *sbi = sb->s_fs_info;
+ uint64_t amount;
+ int ret = 0;
+
+ BUG_ON(!PageLocked(page));
+
+ if (PageUptodate(page))
+ goto out;
+
+ if (page->index < end_index)
+ amount = PAGE_CACHE_SIZE;
+ else
+ amount = i_size & (PAGE_CACHE_SIZE - 1);
+
+ /* this will be out of bounds, or doesn't exist yet */
+ if ((page->index >= end_index + 1) || !obj_created(oi) || !amount
+ /*|| (i_start >= oi->i_commit_size)*/) {
+ clear_highpage(page);
+
+ SetPageUptodate(page);
+ if (PageError(page))
+ ClearPageError(page);
+ if (is_async_unlock)
+ unlock_page(page);
+ goto out;
+ }
+
+ if (amount != PAGE_CACHE_SIZE)
+ zero_user(page, amount, PAGE_CACHE_SIZE - amount);
+
+
+ req = prepare_osd_read_pages(sbi->s_dev, sbi->s_pid,
+ ino + EXOFS_OBJ_OFF, amount, i_start,
+ &page, 1);
+ if (!req) {
+ EXOFS_ERR("ERROR: readpage failed.\n");
+ ret = -ENOMEM;
+ unlock_page(page);
+ goto out;
+ }
+
+ atomic_inc(&sbi->s_curr_pending);
+ if (!is_async_unlock) {
+ exofs_sync_op(req, sbi->s_timeout, oi->i_cred);
+ ret = __readpage_done(req, page, false);
+ } else {
+ ret = exofs_async_op(req, readpage_done, page, oi->i_cred);
+ if (ret) {
+ free_osd_req(req);
+ unlock_page(page);
+ atomic_dec(&sbi->s_curr_pending);
+ }
+ }
+
+out:
+ return ret;
+}
+
+static int readpage_filler(struct page *page)
+{
+ int ret = __readpage_filler(page, true);
+
+ return ret;
+}
+
+/*
+ * We don't need the file
+ */
+static int exofs_readpage(struct file *file, struct page *page)
+{
+ return readpage_filler(page);
+}
+
+/*
+ * We don't need the data
+ */
+static int readpage_strip(void *data, struct page *page)
+{
+ return readpage_filler(page);
+}
+
+/*
+ * read a bunch of pages - usually for readahead
+ */
+static int exofs_readpages(struct file *file, struct address_space *mapping,
+ struct list_head *pages, unsigned nr_pages)
+{
+ return read_cache_pages(mapping, pages, readpage_strip, NULL);
+}
+
+const struct address_space_operations exofs_aops = {
+ .readpage = exofs_readpage,
+ .readpages = exofs_readpages,
+ .writepage = exofs_writepage,
+ .write_begin = exofs_write_begin_export,
+ .write_end = simple_write_end,
+ .writepages = generic_writepages,
+};
+
+/******************************************************************************
+ * INODE OPERATIONS
+ *****************************************************************************/
+
+/*
+ * Test whether an inode is a fast symlink.
+ */
+static inline int exofs_inode_is_fast_symlink(struct inode *inode)
+{
+ struct exofs_i_info *oi = exofs_i(inode);
+
+ return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0);
+}
+
+/*
+ * get_block_t - Fill in a buffer_head
+ * An OSD takes care of block allocation so we just fake an allocation by
+ * putting in the inode's sector_t in the buffer_head.
+ * TODO: What about the case of create==0 and @iblock does not exist in the
+ * object?
+ */
+static int exofs_get_block(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create)
+{
+ map_bh(bh_result, inode->i_sb, iblock);
+ return 0;
+}
+
+/*
+ * Truncate a file to the specified size - all we have to do is set the size
+ * attribute. We make sure the object exists first.
+ */
+void exofs_truncate(struct inode *inode)
+{
+ struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
+ struct exofs_i_info *oi = exofs_i(inode);
+ struct osd_request *req = NULL;
+ loff_t isize = i_size_read(inode);
+ uint64_t newsize;
+ int ret;
+
+ if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
+ || S_ISLNK(inode->i_mode)))
+ return;
+ if (exofs_inode_is_fast_symlink(inode))
+ return;
+ if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
+ return;
+ inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+
+ nobh_truncate_page(inode->i_mapping, isize, exofs_get_block);
+
+ req = prepare_osd_set_attr(sbi->s_dev, sbi->s_pid,
+ inode->i_ino + EXOFS_OBJ_OFF);
+ if (!req) {
+ EXOFS_ERR("ERROR: prepare set_attr failed.\n");
+ goto fail;
+ }
+
+ newsize = cpu_to_le64((uint64_t) isize);
+ prepare_set_attr_list_add_entry(req, OSD_APAGE_OBJECT_INFORMATION,
+ OSD_ATTR_OI_LOGICAL_LENGTH, 8,
+ (unsigned char *)(&newsize));
+
+ /* if we are about to truncate an object, and it 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_sync_op(req, sbi->s_timeout, oi->i_cred);
+ free_osd_req(req);
+ if (ret)
+ goto fail;
+
+out:
+ mark_inode_dirty(inode);
+ return;
+fail:
+ make_bad_inode(inode);
+ goto out;
+}
+
+/*
+ * Set inode attributes - just call generic functions.
+ */
+int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+ struct inode *inode = dentry->d_inode;
+ int error;
+
+ error = inode_change_ok(inode, iattr);
+ if (error)
+ return error;
+
+ 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 *req = NULL;
+ uint32_t attr_page;
+ uint32_t attr_id;
+ uint16_t expected;
+ uint8_t *buf;
+ uint64_t o_id;
+ int ret;
+
+ o_id = oi->vfs_inode.i_ino + EXOFS_OBJ_OFF;
+
+ exofs_make_credential(oi->i_cred, sbi->s_pid, o_id);
+
+ req = prepare_osd_get_attr(sbi->s_dev, sbi->s_pid, o_id);
+ if (!req) {
+ EXOFS_ERR("ERROR: prepare get_attr failed.\n");
+ return -ENOMEM;
+ }
+
+ /* we need the inode attribute */
+ prepare_get_attr_list_add_entry(req,
+ OSD_PAGE_NUM_IBM_UOBJ_FS_DATA,
+ OSD_ATTR_NUM_IBM_UOBJ_FS_DATA_INODE,
+ EXOFS_INO_ATTR_SIZE);
+
+#ifdef EXOFS_DEBUG
+ /* we get the size attributes to do a sanity check */
+ prepare_get_attr_list_add_entry(req,
+ OSD_APAGE_OBJECT_INFORMATION,
+ OSD_ATTR_OI_LOGICAL_LENGTH, 8);
+#endif
+
+ ret = exofs_sync_op(req, sbi->s_timeout, oi->i_cred);
+ if (ret)
+ goto out;
+
+ attr_page = OSD_PAGE_NUM_IBM_UOBJ_FS_DATA;
+ attr_id = OSD_ATTR_NUM_IBM_UOBJ_FS_DATA_INODE;
+ expected = EXOFS_INO_ATTR_SIZE;
+ ret = extract_next_attr_from_req(req, &attr_page, &attr_id, &expected,
+ &buf);
+ if (ret) {
+ EXOFS_ERR("ERROR: extract attr from req failed\n");
+ goto out;
+ }
+ memcpy(inode, buf, sizeof(struct exofs_fcb));
+
+#ifdef EXOFS_DEBUG
+ attr_page = OSD_APAGE_OBJECT_INFORMATION;
+ attr_id = OSD_ATTR_OI_LOGICAL_LENGTH;
+ expected = 8;
+ ret = extract_next_attr_from_req(req, &attr_page, &attr_id, &expected,
+ &buf);
+ if (ret) {
+ EXOFS_ERR("ERROR: extract attr from req failed\n");
+ goto out;
+ }
+ *sanity = le64_to_cpu(*((uint64_t *) buf));
+#endif
+
+out:
+ free_osd_req(req);
+ 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 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
+ if ((inode->i_size != sanity) &&
+ (!exofs_inode_is_fast_symlink(inode))) {
+ EXOFS_ERR("WARNING: Size of object from inode and "
+ "attributes differ (%lld != %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);
+}
+
+/*
+ * 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 *req, 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(req);
+ free_osd_req(req);
+ atomic_dec(&sbi->s_curr_pending);
+
+ if (ret)
+ make_bad_inode(inode);
+ else
+ set_obj_created(oi);
+
+ atomic_dec(&inode->i_count);
+}
+
+/*
+ * 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 *req = NULL;
+ 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);
+
+ req = prepare_osd_create(sbi->s_dev, sbi->s_pid,
+ inode->i_ino + EXOFS_OBJ_OFF);
+ if (!req) {
+ EXOFS_ERR("ERROR: prepare_osd_create failed\n");
+ return ERR_PTR(-EIO);
+ }
+
+ exofs_make_credential(oi->i_cred, sbi->s_pid,
+ inode->i_ino + EXOFS_OBJ_OFF);
+
+ /* 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(req, create_done, inode, oi->i_cred);
+ if (ret) {
+ atomic_dec(&inode->i_count);
+ free_osd_req(req);
+ return ERR_PTR(-EIO);
+ }
+ atomic_inc(&sbi->s_curr_pending);
+
+ return inode;
+}
+
+/*
+ * Callback function from exofs_update_inode().
+ */
+static void updatei_done(struct osd_request *req, void *p)
+{
+ struct updatei_args *args = p;
+
+ free_osd_req(req);
+
+ 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_request *req;
+ 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));
+
+ req = prepare_osd_set_attr(sbi->s_dev, sbi->s_pid,
+ (uint64_t) (inode->i_ino + EXOFS_OBJ_OFF));
+ if (!req) {
+ EXOFS_ERR("ERROR: prepare set_attr failed.\n");
+ ret = -ENOMEM;
+ goto free_args;
+ }
+
+ prepare_set_attr_list_add_entry(req,
+ OSD_PAGE_NUM_IBM_UOBJ_FS_DATA,
+ OSD_ATTR_NUM_IBM_UOBJ_FS_DATA_INODE,
+ EXOFS_INO_ATTR_SIZE,
+ (unsigned char *)fcb);
+
+ if (!obj_created(oi)) {
+ BUG_ON(!obj_2bcreated(oi));
+ wait_event(oi->i_wq, obj_created(oi));
+ }
+
+ if (do_sync) {
+ ret = exofs_sync_op(req, sbi->s_timeout, oi->i_cred);
+ free_osd_req(req);
+ goto free_args;
+ } else {
+ args->sbi = sbi;
+
+ ret = exofs_async_op(req, updatei_done, args, oi->i_cred);
+ if (ret) {
+ free_osd_req(req);
+ goto free_args;
+ }
+ atomic_inc(&sbi->s_curr_pending);
+ goto out; /* deallocation in updatei_done */
+ }
+
+free_args:
+ kfree(args);
+out:
+ return ret;
+}
+
+int exofs_write_inode(struct inode *inode, int wait)
+{
+ return exofs_update_inode(inode, wait);
+}
+
+int exofs_sync_inode(struct inode *inode)
+{
+ struct writeback_control wbc = {
+ .sync_mode = WB_SYNC_ALL,
+ .nr_to_write = 0, /* sys_fsync did this */
+ };
+
+ return sync_inode(inode, &wbc);
+}
+
+/*
+ * Callback function from exofs_delete_inode() - don't have much cleaning up to
+ * do.
+ */
+static void delete_done(struct osd_request *req, void *p)
+{
+ struct exofs_sb_info *sbi;
+ free_osd_req(req);
+ 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 osd_request *req = NULL;
+ struct super_block *sb = inode->i_sb;
+ struct exofs_sb_info *sbi = sb->s_fs_info;
+ 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);
+
+ req = prepare_osd_remove(sbi->s_dev, sbi->s_pid,
+ inode->i_ino + EXOFS_OBJ_OFF);
+ if (!req) {
+ EXOFS_ERR("ERROR: prepare_osd_remove failed\n");
+ return;
+ }
+
+ /* 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(req, delete_done, sbi, oi->i_cred);
+ if (ret) {
+ EXOFS_ERR(
+ "ERROR: @exofs_delete_inode exofs_async_op failed\n");
+ free_osd_req(req);
+ return;
+ }
+ atomic_inc(&sbi->s_curr_pending);
+
+ return;
+
+no_delete:
+ clear_inode(inode);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-13 04:12:42 +0000