#include <asm/byteorder.h>
#include <linux/swap.h>
#include <linux/pipe_fs_i.h>
+#include <linux/mpage.h>
+#include <linux/quotaops.h>
#define MLOG_MASK_PREFIX ML_FILE_IO
#include <cluster/masklog.h>
#include "suballoc.h"
#include "super.h"
#include "symlink.h"
+#include "refcounttree.h"
#include "buffer_head_io.h"
goto bail;
}
- status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
- OCFS2_I(inode)->ip_blkno,
- &bh, OCFS2_BH_CACHED, inode);
+ status = ocfs2_read_inode_block(inode, &bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
fe = (struct ocfs2_dinode *) bh->b_data;
- if (!OCFS2_IS_VALID_DINODE(fe)) {
- mlog(ML_ERROR, "Invalid dinode #%llu: signature = %.*s\n",
- (unsigned long long)fe->i_blkno, 7, fe->i_signature);
- goto bail;
- }
-
if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb,
le32_to_cpu(fe->i_clusters))) {
mlog(ML_ERROR, "block offset is outside the allocated size: "
err = 0;
bail:
- if (bh)
- brelse(bh);
+ brelse(bh);
mlog_exit(err);
return err;
}
-static int ocfs2_get_block(struct inode *inode, sector_t iblock,
- struct buffer_head *bh_result, int create)
+int ocfs2_get_block(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create)
{
int err = 0;
- u64 p_blkno, past_eof;
+ unsigned int ext_flags;
+ u64 max_blocks = bh_result->b_size >> inode->i_blkbits;
+ u64 p_blkno, count, past_eof;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
mlog_entry("(0x%p, %llu, 0x%p, %d)\n", inode,
goto bail;
}
- err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, NULL);
+ err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count,
+ &ext_flags);
if (err) {
mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, "
"%llu, NULL)\n", err, inode, (unsigned long long)iblock,
goto bail;
}
+ if (max_blocks < count)
+ count = max_blocks;
+
/*
* ocfs2 never allocates in this function - the only time we
* need to use BH_New is when we're extending i_size on a file
* system which doesn't support holes, in which case BH_New
* allows block_prepare_write() to zero.
+ *
+ * If we see this on a sparse file system, then a truncate has
+ * raced us and removed the cluster. In this case, we clear
+ * the buffers dirty and uptodate bits and let the buffer code
+ * ignore it as a hole.
*/
- mlog_bug_on_msg(create && p_blkno == 0 && ocfs2_sparse_alloc(osb),
- "ino %lu, iblock %llu\n", inode->i_ino,
- (unsigned long long)iblock);
+ if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) {
+ clear_buffer_dirty(bh_result);
+ clear_buffer_uptodate(bh_result);
+ goto bail;
+ }
- if (p_blkno)
+ /* Treat the unwritten extent as a hole for zeroing purposes. */
+ if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
map_bh(bh_result, inode->i_sb, p_blkno);
+ bh_result->b_size = count << inode->i_blkbits;
+
if (!ocfs2_sparse_alloc(osb)) {
if (p_blkno == 0) {
err = -EIO;
(unsigned long long)OCFS2_I(inode)->ip_blkno);
mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters);
dump_stack();
+ goto bail;
}
past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
return err;
}
+int ocfs2_read_inline_data(struct inode *inode, struct page *page,
+ struct buffer_head *di_bh)
+{
+ void *kaddr;
+ loff_t size;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+
+ if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) {
+ ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno);
+ return -EROFS;
+ }
+
+ size = i_size_read(inode);
+
+ if (size > PAGE_CACHE_SIZE ||
+ size > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) {
+ ocfs2_error(inode->i_sb,
+ "Inode %llu has with inline data has bad size: %Lu",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno,
+ (unsigned long long)size);
+ return -EROFS;
+ }
+
+ kaddr = kmap_atomic(page, KM_USER0);
+ if (size)
+ memcpy(kaddr, di->id2.i_data.id_data, size);
+ /* Clear the remaining part of the page */
+ memset(kaddr + size, 0, PAGE_CACHE_SIZE - size);
+ flush_dcache_page(page);
+ kunmap_atomic(kaddr, KM_USER0);
+
+ SetPageUptodate(page);
+
+ return 0;
+}
+
+static int ocfs2_readpage_inline(struct inode *inode, struct page *page)
+{
+ int ret;
+ struct buffer_head *di_bh = NULL;
+
+ BUG_ON(!PageLocked(page));
+ BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
+
+ ret = ocfs2_read_inode_block(inode, &di_bh);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_read_inline_data(inode, page, di_bh);
+out:
+ unlock_page(page);
+
+ brelse(di_bh);
+ return ret;
+}
+
static int ocfs2_readpage(struct file *file, struct page *page)
{
struct inode *inode = page->mapping->host;
+ struct ocfs2_inode_info *oi = OCFS2_I(inode);
loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT;
int ret, unlock = 1;
mlog_entry("(0x%p, %lu)\n", file, (page ? page->index : 0));
- ret = ocfs2_meta_lock_with_page(inode, NULL, 0, page);
+ ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page);
if (ret != 0) {
if (ret == AOP_TRUNCATED_PAGE)
unlock = 0;
goto out;
}
- down_read(&OCFS2_I(inode)->ip_alloc_sem);
+ if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
+ ret = AOP_TRUNCATED_PAGE;
+ goto out_inode_unlock;
+ }
/*
* i_size might have just been updated as we grabed the meta lock. We
* might now be discovering a truncate that hit on another node.
* block_read_full_page->get_block freaks out if it is asked to read
* beyond the end of a file, so we check here. Callers
- * (generic_file_read, fault->nopage) are clever enough to check i_size
+ * (generic_file_read, vm_ops->fault) are clever enough to check i_size
* and notice that the page they just read isn't needed.
*
* XXX sys_readahead() seems to get that wrong?
*/
if (start >= i_size_read(inode)) {
- char *addr = kmap(page);
- memset(addr, 0, PAGE_SIZE);
- flush_dcache_page(page);
- kunmap(page);
+ zero_user(page, 0, PAGE_SIZE);
SetPageUptodate(page);
ret = 0;
goto out_alloc;
}
- ret = ocfs2_data_lock_with_page(inode, 0, page);
- if (ret != 0) {
- if (ret == AOP_TRUNCATED_PAGE)
- unlock = 0;
- mlog_errno(ret);
- goto out_alloc;
- }
-
- ret = block_read_full_page(page, ocfs2_get_block);
+ if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
+ ret = ocfs2_readpage_inline(inode, page);
+ else
+ ret = block_read_full_page(page, ocfs2_get_block);
unlock = 0;
- ocfs2_data_unlock(inode, 0);
out_alloc:
up_read(&OCFS2_I(inode)->ip_alloc_sem);
- ocfs2_meta_unlock(inode, 0);
+out_inode_unlock:
+ ocfs2_inode_unlock(inode, 0);
out:
if (unlock)
unlock_page(page);
return ret;
}
+/*
+ * This is used only for read-ahead. Failures or difficult to handle
+ * situations are safe to ignore.
+ *
+ * Right now, we don't bother with BH_Boundary - in-inode extent lists
+ * are quite large (243 extents on 4k blocks), so most inodes don't
+ * grow out to a tree. If need be, detecting boundary extents could
+ * trivially be added in a future version of ocfs2_get_block().
+ */
+static int ocfs2_readpages(struct file *filp, struct address_space *mapping,
+ struct list_head *pages, unsigned nr_pages)
+{
+ int ret, err = -EIO;
+ struct inode *inode = mapping->host;
+ struct ocfs2_inode_info *oi = OCFS2_I(inode);
+ loff_t start;
+ struct page *last;
+
+ /*
+ * Use the nonblocking flag for the dlm code to avoid page
+ * lock inversion, but don't bother with retrying.
+ */
+ ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK);
+ if (ret)
+ return err;
+
+ if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
+ ocfs2_inode_unlock(inode, 0);
+ return err;
+ }
+
+ /*
+ * Don't bother with inline-data. There isn't anything
+ * to read-ahead in that case anyway...
+ */
+ if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
+ goto out_unlock;
+
+ /*
+ * Check whether a remote node truncated this file - we just
+ * drop out in that case as it's not worth handling here.
+ */
+ last = list_entry(pages->prev, struct page, lru);
+ start = (loff_t)last->index << PAGE_CACHE_SHIFT;
+ if (start >= i_size_read(inode))
+ goto out_unlock;
+
+ err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block);
+
+out_unlock:
+ up_read(&oi->ip_alloc_sem);
+ ocfs2_inode_unlock(inode, 0);
+
+ return err;
+}
+
/* Note: Because we don't support holes, our allocation has
* already happened (allocation writes zeros to the file data)
* so we don't have to worry about ordered writes in
{
int ret;
- down_read(&OCFS2_I(inode)->ip_alloc_sem);
-
ret = block_prepare_write(page, from, to, ocfs2_get_block);
- up_read(&OCFS2_I(inode)->ip_alloc_sem);
-
return ret;
}
unsigned to)
{
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
- handle_t *handle = NULL;
+ handle_t *handle;
int ret = 0;
handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
- if (!handle) {
+ if (IS_ERR(handle)) {
ret = -ENOMEM;
mlog_errno(ret);
goto out;
}
if (ocfs2_should_order_data(inode)) {
- ret = walk_page_buffers(handle,
- page_buffers(page),
- from, to, NULL,
- ocfs2_journal_dirty_data);
- if (ret < 0)
+ ret = ocfs2_jbd2_file_inode(handle, inode);
+ if (ret < 0)
mlog_errno(ret);
}
out:
if (ret) {
- if (handle)
+ if (!IS_ERR(handle))
ocfs2_commit_trans(osb, handle);
handle = ERR_PTR(ret);
}
* accessed concurrently from multiple nodes.
*/
if (!INODE_JOURNAL(inode)) {
- err = ocfs2_meta_lock(inode, NULL, 0);
+ err = ocfs2_inode_lock(inode, NULL, 0);
if (err) {
if (err != -ENOENT)
mlog_errno(err);
down_read(&OCFS2_I(inode)->ip_alloc_sem);
}
- err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL);
+ if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
+ err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
+ NULL);
if (!INODE_JOURNAL(inode)) {
up_read(&OCFS2_I(inode)->ip_alloc_sem);
- ocfs2_meta_unlock(inode, 0);
+ ocfs2_inode_unlock(inode, 0);
}
if (err) {
goto bail;
}
-
bail:
status = err ? 0 : p_blkno;
*
* called like this: dio->get_blocks(dio->inode, fs_startblk,
* fs_count, map_bh, dio->rw == WRITE);
+ *
+ * Note that we never bother to allocate blocks here, and thus ignore the
+ * create argument.
*/
static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
int ret;
- u64 p_blkno, inode_blocks;
- int contig_blocks;
+ u64 p_blkno, inode_blocks, contig_blocks;
+ unsigned int ext_flags;
unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
- /*
- * Any write past EOF is not allowed because we'd be extending.
- */
- if (create && (iblock + max_blocks) > inode_blocks) {
- ret = -EIO;
- goto bail;
- }
-
/* This figures out the size of the next contiguous block, and
* our logical offset */
ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno,
- &contig_blocks);
+ &contig_blocks, &ext_flags);
if (ret) {
mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n",
(unsigned long long)iblock);
goto bail;
}
- if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)) && !p_blkno) {
- ocfs2_error(inode->i_sb,
- "Inode %llu has a hole at block %llu\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno,
- (unsigned long long)iblock);
- ret = -EROFS;
- goto bail;
- }
-
+ /* We should already CoW the refcounted extent. */
+ BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
/*
* get_more_blocks() expects us to describe a hole by clearing
* the mapped bit on bh_result().
+ *
+ * Consider an unwritten extent as a hole.
*/
- if (p_blkno)
+ if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
map_bh(bh_result, inode->i_sb, p_blkno);
- else {
- /*
- * ocfs2_prepare_inode_for_write() should have caught
- * the case where we'd be filling a hole and triggered
- * a buffered write instead.
- */
- if (create) {
- ret = -EIO;
- mlog_errno(ret);
- goto bail;
- }
-
+ else
clear_buffer_mapped(bh_result);
- }
/* make sure we don't map more than max_blocks blocks here as
that's all the kernel will handle at this point. */
void *private)
{
struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
+ int level;
/* this io's submitter should not have unlocked this before we could */
BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
+
ocfs2_iocb_clear_rw_locked(iocb);
- up_read(&inode->i_alloc_sem);
- ocfs2_rw_unlock(inode, 0);
+
+ level = ocfs2_iocb_rw_locked_level(iocb);
+ if (!level)
+ up_read(&inode->i_alloc_sem);
+ ocfs2_rw_unlock(inode, level);
}
/*
{
journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
- journal_invalidatepage(journal, page, offset);
+ jbd2_journal_invalidatepage(journal, page, offset);
}
static int ocfs2_releasepage(struct page *page, gfp_t wait)
if (!page_has_buffers(page))
return 0;
- return journal_try_to_free_buffers(journal, page, wait);
+ return jbd2_journal_try_to_free_buffers(journal, page, wait);
}
static ssize_t ocfs2_direct_IO(int rw,
mlog_entry_void();
- if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) {
- /*
- * We get PR data locks even for O_DIRECT. This
- * allows concurrent O_DIRECT I/O but doesn't let
- * O_DIRECT with extending and buffered zeroing writes
- * race. If they did race then the buffered zeroing
- * could be written back after the O_DIRECT I/O. It's
- * one thing to tell people not to mix buffered and
- * O_DIRECT writes, but expecting them to understand
- * that file extension is also an implicit buffered
- * write is too much. By getting the PR we force
- * writeback of the buffered zeroing before
- * proceeding.
- */
- ret = ocfs2_data_lock(inode, 0);
- if (ret < 0) {
- mlog_errno(ret);
- goto out;
- }
- ocfs2_data_unlock(inode, 0);
- }
+ /*
+ * Fallback to buffered I/O if we see an inode without
+ * extents.
+ */
+ if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
+ return 0;
+
+ /* Fallback to buffered I/O if we are appending. */
+ if (i_size_read(inode) <= offset)
+ return 0;
ret = blockdev_direct_IO_no_locking(rw, iocb, inode,
inode->i_sb->s_bdev, iov, offset,
nr_segs,
ocfs2_direct_IO_get_blocks,
ocfs2_dio_end_io);
-out:
+
mlog_exit(ret);
return ret;
}
}
/*
+ * Nonsparse file systems fully allocate before we get to the write
+ * code. This prevents ocfs2_write() from tagging the write as an
+ * allocating one, which means ocfs2_map_page_blocks() might try to
+ * read-in the blocks at the tail of our file. Avoid reading them by
+ * testing i_size against each block offset.
+ */
+static int ocfs2_should_read_blk(struct inode *inode, struct page *page,
+ unsigned int block_start)
+{
+ u64 offset = page_offset(page) + block_start;
+
+ if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
+ return 1;
+
+ if (i_size_read(inode) > offset)
+ return 1;
+
+ return 0;
+}
+
+/*
* Some of this taken from block_prepare_write(). We already have our
* mapping by now though, and the entire write will be allocating or
* it won't, so not much need to use BH_New.
bh = bh->b_this_page, block_start += bsize) {
block_end = block_start + bsize;
+ clear_buffer_new(bh);
+
/*
* Ignore blocks outside of our i/o range -
* they may belong to unallocated clusters.
* For an allocating write with cluster size >= page
* size, we always write the entire page.
*/
-
- if (buffer_new(bh))
- clear_buffer_new(bh);
+ if (new)
+ set_buffer_new(bh);
if (!buffer_mapped(bh)) {
map_bh(bh, inode->i_sb, *p_blkno);
if (!buffer_uptodate(bh))
set_buffer_uptodate(bh);
} else if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
- (block_start < from || block_end > to)) {
+ !buffer_new(bh) &&
+ ocfs2_should_read_blk(inode, page, block_start) &&
+ (block_start < from || block_end > to)) {
ll_rw_block(READ, 1, &bh);
*wait_bh++=bh;
}
bh = head;
block_start = 0;
do {
- void *kaddr;
-
block_end = block_start + bsize;
if (block_end <= from)
goto next_bh;
if (block_start >= to)
break;
- kaddr = kmap_atomic(page, KM_USER0);
- memset(kaddr+block_start, 0, bh->b_size);
- flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_USER0);
+ zero_user(page, block_start, bh->b_size);
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
return ret;
}
+#if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE)
+#define OCFS2_MAX_CTXT_PAGES 1
+#else
+#define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE)
+#endif
+
+#define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE)
+
/*
- * This will copy user data from the buffer page in the splice
- * context.
- *
- * For now, we ignore SPLICE_F_MOVE as that would require some extra
- * communication out all the way to ocfs2_write().
+ * Describe the state of a single cluster to be written to.
*/
-int ocfs2_map_and_write_splice_data(struct inode *inode,
- struct ocfs2_write_ctxt *wc, u64 *p_blkno,
- unsigned int *ret_from, unsigned int *ret_to)
-{
- int ret;
- unsigned int to, from, cluster_start, cluster_end;
- char *src, *dst;
- struct ocfs2_splice_write_priv *sp = wc->w_private;
- struct pipe_buffer *buf = sp->s_buf;
- unsigned long bytes, src_from;
- struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+struct ocfs2_write_cluster_desc {
+ u32 c_cpos;
+ u32 c_phys;
+ /*
+ * Give this a unique field because c_phys eventually gets
+ * filled.
+ */
+ unsigned c_new;
+ unsigned c_unwritten;
+ unsigned c_needs_zero;
+};
- ocfs2_figure_cluster_boundaries(osb, wc->w_cpos, &cluster_start,
- &cluster_end);
+struct ocfs2_write_ctxt {
+ /* Logical cluster position / len of write */
+ u32 w_cpos;
+ u32 w_clen;
- from = sp->s_offset;
- src_from = sp->s_buf_offset;
- bytes = wc->w_count;
+ /* First cluster allocated in a nonsparse extend */
+ u32 w_first_new_cpos;
- if (wc->w_large_pages) {
- /*
- * For cluster size < page size, we have to
- * calculate pos within the cluster and obey
- * the rightmost boundary.
- */
- bytes = min(bytes, (unsigned long)(osb->s_clustersize
- - (wc->w_pos & (osb->s_clustersize - 1))));
- }
- to = from + bytes;
+ struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE];
- if (wc->w_this_page_new)
- ret = ocfs2_map_page_blocks(wc->w_this_page, p_blkno, inode,
- cluster_start, cluster_end, 1);
- else
- ret = ocfs2_map_page_blocks(wc->w_this_page, p_blkno, inode,
- from, to, 0);
- if (ret) {
- mlog_errno(ret);
- goto out;
+ /*
+ * This is true if page_size > cluster_size.
+ *
+ * It triggers a set of special cases during write which might
+ * have to deal with allocating writes to partial pages.
+ */
+ unsigned int w_large_pages;
+
+ /*
+ * Pages involved in this write.
+ *
+ * w_target_page is the page being written to by the user.
+ *
+ * w_pages is an array of pages which always contains
+ * w_target_page, and in the case of an allocating write with
+ * page_size < cluster size, it will contain zero'd and mapped
+ * pages adjacent to w_target_page which need to be written
+ * out in so that future reads from that region will get
+ * zero's.
+ */
+ struct page *w_pages[OCFS2_MAX_CTXT_PAGES];
+ unsigned int w_num_pages;
+ struct page *w_target_page;
+
+ /*
+ * ocfs2_write_end() uses this to know what the real range to
+ * write in the target should be.
+ */
+ unsigned int w_target_from;
+ unsigned int w_target_to;
+
+ /*
+ * We could use journal_current_handle() but this is cleaner,
+ * IMHO -Mark
+ */
+ handle_t *w_handle;
+
+ struct buffer_head *w_di_bh;
+
+ struct ocfs2_cached_dealloc_ctxt w_dealloc;
+};
+
+void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages)
+{
+ int i;
+
+ for(i = 0; i < num_pages; i++) {
+ if (pages[i]) {
+ unlock_page(pages[i]);
+ mark_page_accessed(pages[i]);
+ page_cache_release(pages[i]);
+ }
}
+}
+
+static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc)
+{
+ ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages);
+
+ brelse(wc->w_di_bh);
+ kfree(wc);
+}
- BUG_ON(from > PAGE_CACHE_SIZE);
- BUG_ON(to > PAGE_CACHE_SIZE);
- BUG_ON(from > osb->s_clustersize);
- BUG_ON(to > osb->s_clustersize);
+static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp,
+ struct ocfs2_super *osb, loff_t pos,
+ unsigned len, struct buffer_head *di_bh)
+{
+ u32 cend;
+ struct ocfs2_write_ctxt *wc;
- src = buf->ops->map(sp->s_pipe, buf, 1);
- dst = kmap_atomic(wc->w_this_page, KM_USER1);
- memcpy(dst + from, src + src_from, bytes);
- kunmap_atomic(wc->w_this_page, KM_USER1);
- buf->ops->unmap(sp->s_pipe, buf, src);
+ wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS);
+ if (!wc)
+ return -ENOMEM;
- wc->w_finished_copy = 1;
+ wc->w_cpos = pos >> osb->s_clustersize_bits;
+ wc->w_first_new_cpos = UINT_MAX;
+ cend = (pos + len - 1) >> osb->s_clustersize_bits;
+ wc->w_clen = cend - wc->w_cpos + 1;
+ get_bh(di_bh);
+ wc->w_di_bh = di_bh;
- *ret_from = from;
- *ret_to = to;
-out:
+ if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits))
+ wc->w_large_pages = 1;
+ else
+ wc->w_large_pages = 0;
- return bytes ? (unsigned int)bytes : ret;
+ ocfs2_init_dealloc_ctxt(&wc->w_dealloc);
+
+ *wcp = wc;
+
+ return 0;
}
/*
- * This will copy user data from the iovec in the buffered write
- * context.
+ * If a page has any new buffers, zero them out here, and mark them uptodate
+ * and dirty so they'll be written out (in order to prevent uninitialised
+ * block data from leaking). And clear the new bit.
*/
-int ocfs2_map_and_write_user_data(struct inode *inode,
- struct ocfs2_write_ctxt *wc, u64 *p_blkno,
- unsigned int *ret_from, unsigned int *ret_to)
+static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to)
{
- int ret;
- unsigned int to, from, cluster_start, cluster_end;
- unsigned long bytes, src_from;
- char *dst;
- struct ocfs2_buffered_write_priv *bp = wc->w_private;
- const struct iovec *cur_iov = bp->b_cur_iov;
- char __user *buf;
- struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ unsigned int block_start, block_end;
+ struct buffer_head *head, *bh;
- ocfs2_figure_cluster_boundaries(osb, wc->w_cpos, &cluster_start,
- &cluster_end);
+ BUG_ON(!PageLocked(page));
+ if (!page_has_buffers(page))
+ return;
- buf = cur_iov->iov_base + bp->b_cur_off;
- src_from = (unsigned long)buf & ~PAGE_CACHE_MASK;
+ bh = head = page_buffers(page);
+ block_start = 0;
+ do {
+ block_end = block_start + bh->b_size;
- from = wc->w_pos & (PAGE_CACHE_SIZE - 1);
+ if (buffer_new(bh)) {
+ if (block_end > from && block_start < to) {
+ if (!PageUptodate(page)) {
+ unsigned start, end;
- /*
- * This is a lot of comparisons, but it reads quite
- * easily, which is important here.
- */
- /* Stay within the src page */
- bytes = PAGE_SIZE - src_from;
- /* Stay within the vector */
- bytes = min(bytes,
- (unsigned long)(cur_iov->iov_len - bp->b_cur_off));
- /* Stay within count */
- bytes = min(bytes, (unsigned long)wc->w_count);
- /*
- * For clustersize > page size, just stay within
- * target page, otherwise we have to calculate pos
- * within the cluster and obey the rightmost
- * boundary.
- */
- if (wc->w_large_pages) {
- /*
- * For cluster size < page size, we have to
- * calculate pos within the cluster and obey
- * the rightmost boundary.
- */
- bytes = min(bytes, (unsigned long)(osb->s_clustersize
- - (wc->w_pos & (osb->s_clustersize - 1))));
- } else {
- /*
- * cluster size > page size is the most common
- * case - we just stay within the target page
- * boundary.
- */
- bytes = min(bytes, PAGE_CACHE_SIZE - from);
- }
+ start = max(from, block_start);
+ end = min(to, block_end);
- to = from + bytes;
+ zero_user_segment(page, start, end);
+ set_buffer_uptodate(bh);
+ }
- if (wc->w_this_page_new)
- ret = ocfs2_map_page_blocks(wc->w_this_page, p_blkno, inode,
- cluster_start, cluster_end, 1);
- else
- ret = ocfs2_map_page_blocks(wc->w_this_page, p_blkno, inode,
- from, to, 0);
- if (ret) {
- mlog_errno(ret);
- goto out;
- }
+ clear_buffer_new(bh);
+ mark_buffer_dirty(bh);
+ }
+ }
+
+ block_start = block_end;
+ bh = bh->b_this_page;
+ } while (bh != head);
+}
- BUG_ON(from > PAGE_CACHE_SIZE);
- BUG_ON(to > PAGE_CACHE_SIZE);
- BUG_ON(from > osb->s_clustersize);
- BUG_ON(to > osb->s_clustersize);
+/*
+ * Only called when we have a failure during allocating write to write
+ * zero's to the newly allocated region.
+ */
+static void ocfs2_write_failure(struct inode *inode,
+ struct ocfs2_write_ctxt *wc,
+ loff_t user_pos, unsigned user_len)
+{
+ int i;
+ unsigned from = user_pos & (PAGE_CACHE_SIZE - 1),
+ to = user_pos + user_len;
+ struct page *tmppage;
- dst = kmap(wc->w_this_page);
- memcpy(dst + from, bp->b_src_buf + src_from, bytes);
- kunmap(wc->w_this_page);
+ ocfs2_zero_new_buffers(wc->w_target_page, from, to);
- /*
- * XXX: This is slow, but simple. The caller of
- * ocfs2_buffered_write_cluster() is responsible for
- * passing through the iovecs, so it's difficult to
- * predict what our next step is in here after our
- * initial write. A future version should be pushing
- * that iovec manipulation further down.
- *
- * By setting this, we indicate that a copy from user
- * data was done, and subsequent calls for this
- * cluster will skip copying more data.
- */
- wc->w_finished_copy = 1;
+ for(i = 0; i < wc->w_num_pages; i++) {
+ tmppage = wc->w_pages[i];
- *ret_from = from;
- *ret_to = to;
-out:
+ if (page_has_buffers(tmppage)) {
+ if (ocfs2_should_order_data(inode))
+ ocfs2_jbd2_file_inode(wc->w_handle, inode);
- return bytes ? (unsigned int)bytes : ret;
+ block_commit_write(tmppage, from, to);
+ }
+ }
}
-/*
- * Map, fill and write a page to disk.
- *
- * The work of copying data is done via callback. Newly allocated
- * pages which don't take user data will be zero'd (set 'new' to
- * indicate an allocating write)
- *
- * Returns a negative error code or the number of bytes copied into
- * the page.
- */
-int ocfs2_write_data_page(struct inode *inode, handle_t *handle,
- u64 *p_blkno, struct page *page,
- struct ocfs2_write_ctxt *wc, int new)
+static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno,
+ struct ocfs2_write_ctxt *wc,
+ struct page *page, u32 cpos,
+ loff_t user_pos, unsigned user_len,
+ int new)
{
- int ret, copied = 0;
- unsigned int from = 0, to = 0;
+ int ret;
+ unsigned int map_from = 0, map_to = 0;
unsigned int cluster_start, cluster_end;
- unsigned int zero_from = 0, zero_to = 0;
+ unsigned int user_data_from = 0, user_data_to = 0;
- ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), wc->w_cpos,
+ ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos,
&cluster_start, &cluster_end);
- if ((wc->w_pos >> PAGE_CACHE_SHIFT) == page->index
- && !wc->w_finished_copy) {
-
- wc->w_this_page = page;
- wc->w_this_page_new = new;
- ret = wc->w_write_data_page(inode, wc, p_blkno, &from, &to);
- if (ret < 0) {
+ if (page == wc->w_target_page) {
+ map_from = user_pos & (PAGE_CACHE_SIZE - 1);
+ map_to = map_from + user_len;
+
+ if (new)
+ ret = ocfs2_map_page_blocks(page, p_blkno, inode,
+ cluster_start, cluster_end,
+ new);
+ else
+ ret = ocfs2_map_page_blocks(page, p_blkno, inode,
+ map_from, map_to, new);
+ if (ret) {
mlog_errno(ret);
goto out;
}
- copied = ret;
-
- zero_from = from;
- zero_to = to;
+ user_data_from = map_from;
+ user_data_to = map_to;
if (new) {
- from = cluster_start;
- to = cluster_end;
+ map_from = cluster_start;
+ map_to = cluster_end;
}
} else {
/*
*/
BUG_ON(!new);
- from = cluster_start;
- to = cluster_end;
+ map_from = cluster_start;
+ map_to = cluster_end;
ret = ocfs2_map_page_blocks(page, p_blkno, inode,
- cluster_start, cluster_end, 1);
+ cluster_start, cluster_end, new);
if (ret) {
mlog_errno(ret);
goto out;
*/
if (new && !PageUptodate(page))
ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb),
- wc->w_cpos, zero_from, zero_to);
+ cpos, user_data_from, user_data_to);
flush_dcache_page(page);
- if (ocfs2_should_order_data(inode)) {
- ret = walk_page_buffers(handle,
- page_buffers(page),
- from, to, NULL,
- ocfs2_journal_dirty_data);
- if (ret < 0)
- mlog_errno(ret);
- }
-
- /*
- * We don't use generic_commit_write() because we need to
- * handle our own i_size update.
- */
- ret = block_commit_write(page, from, to);
- if (ret)
- mlog_errno(ret);
out:
-
- return copied ? copied : ret;
+ return ret;
}
/*
- * Do the actual write of some data into an inode. Optionally allocate
- * in order to fulfill the write.
- *
- * cpos is the logical cluster offset within the file to write at
- *
- * 'phys' is the physical mapping of that offset. a 'phys' value of
- * zero indicates that allocation is required. In this case, data_ac
- * and meta_ac should be valid (meta_ac can be null if metadata
- * allocation isn't required).
+ * This function will only grab one clusters worth of pages.
*/
-static ssize_t ocfs2_write(struct file *file, u32 phys, handle_t *handle,
- struct buffer_head *di_bh,
- struct ocfs2_alloc_context *data_ac,
- struct ocfs2_alloc_context *meta_ac,
- struct ocfs2_write_ctxt *wc)
+static int ocfs2_grab_pages_for_write(struct address_space *mapping,
+ struct ocfs2_write_ctxt *wc,
+ u32 cpos, loff_t user_pos, int new,
+ struct page *mmap_page)
{
- int ret, i, numpages = 1, new;
- unsigned int copied = 0;
- u32 tmp_pos;
- u64 v_blkno, p_blkno;
- struct address_space *mapping = file->f_mapping;
+ int ret = 0, i;
+ unsigned long start, target_index, index;
struct inode *inode = mapping->host;
- unsigned long index, start;
- struct page **cpages;
- new = phys == 0 ? 1 : 0;
+ target_index = user_pos >> PAGE_CACHE_SHIFT;
/*
* Figure out how many pages we'll be manipulating here. For
* non allocating write, we just change the one
* page. Otherwise, we'll need a whole clusters worth.
*/
- if (new)
- numpages = ocfs2_pages_per_cluster(inode->i_sb);
-
- cpages = kzalloc(sizeof(*cpages) * numpages, GFP_NOFS);
- if (!cpages) {
- ret = -ENOMEM;
- mlog_errno(ret);
- return ret;
- }
-
- /*
- * Fill our page array first. That way we've grabbed enough so
- * that we can zero and flush if we error after adding the
- * extent.
- */
if (new) {
- start = ocfs2_align_clusters_to_page_index(inode->i_sb,
- wc->w_cpos);
- v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, wc->w_cpos);
+ wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb);
+ start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos);
} else {
- start = wc->w_pos >> PAGE_CACHE_SHIFT;
- v_blkno = wc->w_pos >> inode->i_sb->s_blocksize_bits;
+ wc->w_num_pages = 1;
+ start = target_index;
}
- for(i = 0; i < numpages; i++) {
+ for(i = 0; i < wc->w_num_pages; i++) {
index = start + i;
- cpages[i] = grab_cache_page(mapping, index);
- if (!cpages[i]) {
- ret = -ENOMEM;
- mlog_errno(ret);
- goto out;
+ if (index == target_index && mmap_page) {
+ /*
+ * ocfs2_pagemkwrite() is a little different
+ * and wants us to directly use the page
+ * passed in.
+ */
+ lock_page(mmap_page);
+
+ if (mmap_page->mapping != mapping) {
+ unlock_page(mmap_page);
+ /*
+ * Sanity check - the locking in
+ * ocfs2_pagemkwrite() should ensure
+ * that this code doesn't trigger.
+ */
+ ret = -EINVAL;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ page_cache_get(mmap_page);
+ wc->w_pages[i] = mmap_page;
+ } else {
+ wc->w_pages[i] = find_or_create_page(mapping, index,
+ GFP_NOFS);
+ if (!wc->w_pages[i]) {
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto out;
+ }
}
+
+ if (index == target_index)
+ wc->w_target_page = wc->w_pages[i];
}
+out:
+ return ret;
+}
+/*
+ * Prepare a single cluster for write one cluster into the file.
+ */
+static int ocfs2_write_cluster(struct address_space *mapping,
+ u32 phys, unsigned int unwritten,
+ unsigned int should_zero,
+ struct ocfs2_alloc_context *data_ac,
+ struct ocfs2_alloc_context *meta_ac,
+ struct ocfs2_write_ctxt *wc, u32 cpos,
+ loff_t user_pos, unsigned user_len)
+{
+ int ret, i, new;
+ u64 v_blkno, p_blkno;
+ struct inode *inode = mapping->host;
+ struct ocfs2_extent_tree et;
+
+ new = phys == 0 ? 1 : 0;
if (new) {
+ u32 tmp_pos;
+
/*
* This is safe to call with the page locks - it won't take
* any additional semaphores or cluster locks.
*/
- tmp_pos = wc->w_cpos;
- ret = ocfs2_do_extend_allocation(OCFS2_SB(inode->i_sb), inode,
- &tmp_pos, 1, di_bh, handle,
- data_ac, meta_ac, NULL);
+ tmp_pos = cpos;
+ ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode,
+ &tmp_pos, 1, 0, wc->w_di_bh,
+ wc->w_handle, data_ac,
+ meta_ac, NULL);
/*
* This shouldn't happen because we must have already
* calculated the correct meta data allocation required. The
mlog_errno(ret);
goto out;
}
+ } else if (unwritten) {
+ ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
+ wc->w_di_bh);
+ ret = ocfs2_mark_extent_written(inode, &et,
+ wc->w_handle, cpos, 1, phys,
+ meta_ac, &wc->w_dealloc);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
}
- ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL);
+ if (should_zero)
+ v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos);
+ else
+ v_blkno = user_pos >> inode->i_sb->s_blocksize_bits;
+
+ /*
+ * The only reason this should fail is due to an inability to
+ * find the extent added.
+ */
+ ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL,
+ NULL);
if (ret < 0) {
+ ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, "
+ "at logical block %llu",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno,
+ (unsigned long long)v_blkno);
+ goto out;
+ }
+
+ BUG_ON(p_blkno == 0);
+
+ for(i = 0; i < wc->w_num_pages; i++) {
+ int tmpret;
+
+ tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc,
+ wc->w_pages[i], cpos,
+ user_pos, user_len,
+ should_zero);
+ if (tmpret) {
+ mlog_errno(tmpret);
+ if (ret == 0)
+ ret = tmpret;
+ }
+ }
+
+ /*
+ * We only have cleanup to do in case of allocating write.
+ */
+ if (ret && new)
+ ocfs2_write_failure(inode, wc, user_pos, user_len);
+
+out:
+
+ return ret;
+}
+
+static int ocfs2_write_cluster_by_desc(struct address_space *mapping,
+ struct ocfs2_alloc_context *data_ac,
+ struct ocfs2_alloc_context *meta_ac,
+ struct ocfs2_write_ctxt *wc,
+ loff_t pos, unsigned len)
+{
+ int ret, i;
+ loff_t cluster_off;
+ unsigned int local_len = len;
+ struct ocfs2_write_cluster_desc *desc;
+ struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb);
+
+ for (i = 0; i < wc->w_clen; i++) {
+ desc = &wc->w_desc[i];
/*
- * XXX: Should we go readonly here?
+ * We have to make sure that the total write passed in
+ * doesn't extend past a single cluster.
*/
+ local_len = len;
+ cluster_off = pos & (osb->s_clustersize - 1);
+ if ((cluster_off + local_len) > osb->s_clustersize)
+ local_len = osb->s_clustersize - cluster_off;
+
+ ret = ocfs2_write_cluster(mapping, desc->c_phys,
+ desc->c_unwritten,
+ desc->c_needs_zero,
+ data_ac, meta_ac,
+ wc, desc->c_cpos, pos, local_len);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ len -= local_len;
+ pos += local_len;
+ }
+ ret = 0;
+out:
+ return ret;
+}
+
+/*
+ * ocfs2_write_end() wants to know which parts of the target page it
+ * should complete the write on. It's easiest to compute them ahead of
+ * time when a more complete view of the write is available.
+ */
+static void ocfs2_set_target_boundaries(struct ocfs2_super *osb,
+ struct ocfs2_write_ctxt *wc,
+ loff_t pos, unsigned len, int alloc)
+{
+ struct ocfs2_write_cluster_desc *desc;
+
+ wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1);
+ wc->w_target_to = wc->w_target_from + len;
+
+ if (alloc == 0)
+ return;
+
+ /*
+ * Allocating write - we may have different boundaries based
+ * on page size and cluster size.
+ *
+ * NOTE: We can no longer compute one value from the other as
+ * the actual write length and user provided length may be
+ * different.
+ */
+
+ if (wc->w_large_pages) {
+ /*
+ * We only care about the 1st and last cluster within
+ * our range and whether they should be zero'd or not. Either
+ * value may be extended out to the start/end of a
+ * newly allocated cluster.
+ */
+ desc = &wc->w_desc[0];
+ if (desc->c_needs_zero)
+ ocfs2_figure_cluster_boundaries(osb,
+ desc->c_cpos,
+ &wc->w_target_from,
+ NULL);
+
+ desc = &wc->w_desc[wc->w_clen - 1];
+ if (desc->c_needs_zero)
+ ocfs2_figure_cluster_boundaries(osb,
+ desc->c_cpos,
+ NULL,
+ &wc->w_target_to);
+ } else {
+ wc->w_target_from = 0;
+ wc->w_target_to = PAGE_CACHE_SIZE;
+ }
+}
+
+/*
+ * Populate each single-cluster write descriptor in the write context
+ * with information about the i/o to be done.
+ *
+ * Returns the number of clusters that will have to be allocated, as
+ * well as a worst case estimate of the number of extent records that
+ * would have to be created during a write to an unwritten region.
+ */
+static int ocfs2_populate_write_desc(struct inode *inode,
+ struct ocfs2_write_ctxt *wc,
+ unsigned int *clusters_to_alloc,
+ unsigned int *extents_to_split)
+{
+ int ret;
+ struct ocfs2_write_cluster_desc *desc;
+ unsigned int num_clusters = 0;
+ unsigned int ext_flags = 0;
+ u32 phys = 0;
+ int i;
+
+ *clusters_to_alloc = 0;
+ *extents_to_split = 0;
+
+ for (i = 0; i < wc->w_clen; i++) {
+ desc = &wc->w_desc[i];
+ desc->c_cpos = wc->w_cpos + i;
+
+ if (num_clusters == 0) {
+ /*
+ * Need to look up the next extent record.
+ */
+ ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys,
+ &num_clusters, &ext_flags);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /* We should already CoW the refcountd extent. */
+ BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
+
+ /*
+ * Assume worst case - that we're writing in
+ * the middle of the extent.
+ *
+ * We can assume that the write proceeds from
+ * left to right, in which case the extent
+ * insert code is smart enough to coalesce the
+ * next splits into the previous records created.
+ */
+ if (ext_flags & OCFS2_EXT_UNWRITTEN)
+ *extents_to_split = *extents_to_split + 2;
+ } else if (phys) {
+ /*
+ * Only increment phys if it doesn't describe
+ * a hole.
+ */
+ phys++;
+ }
+
+ /*
+ * If w_first_new_cpos is < UINT_MAX, we have a non-sparse
+ * file that got extended. w_first_new_cpos tells us
+ * where the newly allocated clusters are so we can
+ * zero them.
+ */
+ if (desc->c_cpos >= wc->w_first_new_cpos) {
+ BUG_ON(phys == 0);
+ desc->c_needs_zero = 1;
+ }
+
+ desc->c_phys = phys;
+ if (phys == 0) {
+ desc->c_new = 1;
+ desc->c_needs_zero = 1;
+ *clusters_to_alloc = *clusters_to_alloc + 1;
+ }
+
+ if (ext_flags & OCFS2_EXT_UNWRITTEN) {
+ desc->c_unwritten = 1;
+ desc->c_needs_zero = 1;
+ }
+
+ num_clusters--;
+ }
+
+ ret = 0;
+out:
+ return ret;
+}
+
+static int ocfs2_write_begin_inline(struct address_space *mapping,
+ struct inode *inode,
+ struct ocfs2_write_ctxt *wc)
+{
+ int ret;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct page *page;
+ handle_t *handle;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
+
+ page = find_or_create_page(mapping, 0, GFP_NOFS);
+ if (!page) {
+ ret = -ENOMEM;
mlog_errno(ret);
goto out;
}
+ /*
+ * If we don't set w_num_pages then this page won't get unlocked
+ * and freed on cleanup of the write context.
+ */
+ wc->w_pages[0] = wc->w_target_page = page;
+ wc->w_num_pages = 1;
- BUG_ON(p_blkno == 0);
+ handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
+ if (IS_ERR(handle)) {
+ ret = PTR_ERR(handle);
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ ocfs2_commit_trans(osb, handle);
+
+ mlog_errno(ret);
+ goto out;
+ }
+
+ if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
+ ocfs2_set_inode_data_inline(inode, di);
+
+ if (!PageUptodate(page)) {
+ ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh);
+ if (ret) {
+ ocfs2_commit_trans(osb, handle);
- for(i = 0; i < numpages; i++) {
- ret = ocfs2_write_data_page(inode, handle, &p_blkno, cpages[i],
- wc, new);
- if (ret < 0) {
- mlog_errno(ret);
goto out;
}
-
- copied += ret;
}
+ wc->w_handle = handle;
out:
- for(i = 0; i < numpages; i++) {
- unlock_page(cpages[i]);
- mark_page_accessed(cpages[i]);
- page_cache_release(cpages[i]);
- }
- kfree(cpages);
+ return ret;
+}
+
+int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size)
+{
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
- return copied ? copied : ret;
+ if (new_size <= le16_to_cpu(di->id2.i_data.id_count))
+ return 1;
+ return 0;
}
-static void ocfs2_write_ctxt_init(struct ocfs2_write_ctxt *wc,
- struct ocfs2_super *osb, loff_t pos,
- size_t count, ocfs2_page_writer *cb,
- void *cb_priv)
+static int ocfs2_try_to_write_inline_data(struct address_space *mapping,
+ struct inode *inode, loff_t pos,
+ unsigned len, struct page *mmap_page,
+ struct ocfs2_write_ctxt *wc)
{
- wc->w_count = count;
- wc->w_pos = pos;
- wc->w_cpos = wc->w_pos >> osb->s_clustersize_bits;
- wc->w_finished_copy = 0;
+ int ret, written = 0;
+ loff_t end = pos + len;
+ struct ocfs2_inode_info *oi = OCFS2_I(inode);
+ struct ocfs2_dinode *di = NULL;
- if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits))
- wc->w_large_pages = 1;
- else
- wc->w_large_pages = 0;
+ mlog(0, "Inode %llu, write of %u bytes at off %llu. features: 0x%x\n",
+ (unsigned long long)oi->ip_blkno, len, (unsigned long long)pos,
+ oi->ip_dyn_features);
- wc->w_write_data_page = cb;
- wc->w_private = cb_priv;
+ /*
+ * Handle inodes which already have inline data 1st.
+ */
+ if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
+ if (mmap_page == NULL &&
+ ocfs2_size_fits_inline_data(wc->w_di_bh, end))
+ goto do_inline_write;
+
+ /*
+ * The write won't fit - we have to give this inode an
+ * inline extent list now.
+ */
+ ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh);
+ if (ret)
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /*
+ * Check whether the inode can accept inline data.
+ */
+ if (oi->ip_clusters != 0 || i_size_read(inode) != 0)
+ return 0;
+
+ /*
+ * Check whether the write can fit.
+ */
+ di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
+ if (mmap_page ||
+ end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di))
+ return 0;
+
+do_inline_write:
+ ret = ocfs2_write_begin_inline(mapping, inode, wc);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /*
+ * This signals to the caller that the data can be written
+ * inline.
+ */
+ written = 1;
+out:
+ return written ? written : ret;
}
/*
- * Write a cluster to an inode. The cluster may not be allocated yet,
- * in which case it will be. This only exists for buffered writes -
- * O_DIRECT takes a more "traditional" path through the kernel.
- *
- * The caller is responsible for incrementing pos, written counts, etc
- *
- * For file systems that don't support sparse files, pre-allocation
- * and page zeroing up until cpos should be done prior to this
- * function call.
+ * This function only does anything for file systems which can't
+ * handle sparse files.
*
- * Callers should be holding i_sem, and the rw cluster lock.
- *
- * Returns the number of user bytes written, or less than zero for
- * error.
+ * What we want to do here is fill in any hole between the current end
+ * of allocation and the end of our write. That way the rest of the
+ * write path can treat it as an non-allocating write, which has no
+ * special case code for sparse/nonsparse files.
*/
-ssize_t ocfs2_buffered_write_cluster(struct file *file, loff_t pos,
- size_t count, ocfs2_page_writer *actor,
- void *priv)
+static int ocfs2_expand_nonsparse_inode(struct inode *inode, loff_t pos,
+ unsigned len,
+ struct ocfs2_write_ctxt *wc)
{
- int ret, credits = OCFS2_INODE_UPDATE_CREDITS;
- ssize_t written = 0;
- u32 phys;
- struct inode *inode = file->f_mapping->host;
+ int ret;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ loff_t newsize = pos + len;
+
+ if (ocfs2_sparse_alloc(osb))
+ return 0;
+
+ if (newsize <= i_size_read(inode))
+ return 0;
+
+ ret = ocfs2_extend_no_holes(inode, newsize, pos);
+ if (ret)
+ mlog_errno(ret);
+
+ wc->w_first_new_cpos =
+ ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode));
+
+ return ret;
+}
+
+int ocfs2_write_begin_nolock(struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata,
+ struct buffer_head *di_bh, struct page *mmap_page)
+{
+ int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS;
+ unsigned int clusters_to_alloc, extents_to_split;
+ struct ocfs2_write_ctxt *wc;
+ struct inode *inode = mapping->host;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
- struct buffer_head *di_bh = NULL;
struct ocfs2_dinode *di;
struct ocfs2_alloc_context *data_ac = NULL;
struct ocfs2_alloc_context *meta_ac = NULL;
handle_t *handle;
- struct ocfs2_write_ctxt wc;
+ struct ocfs2_extent_tree et;
- ocfs2_write_ctxt_init(&wc, osb, pos, count, actor, priv);
-
- ret = ocfs2_meta_lock(inode, &di_bh, 1);
+ ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh);
if (ret) {
mlog_errno(ret);
- goto out;
+ return ret;
}
- di = (struct ocfs2_dinode *)di_bh->b_data;
- /*
- * Take alloc sem here to prevent concurrent lookups. That way
- * the mapping, zeroing and tree manipulation within
- * ocfs2_write() will be safe against ->readpage(). This
- * should also serve to lock out allocation from a shared
- * writeable region.
- */
- down_write(&OCFS2_I(inode)->ip_alloc_sem);
+ if (ocfs2_supports_inline_data(osb)) {
+ ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len,
+ mmap_page, wc);
+ if (ret == 1) {
+ ret = 0;
+ goto success;
+ }
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+ }
- ret = ocfs2_get_clusters(inode, wc.w_cpos, &phys, NULL);
+ ret = ocfs2_expand_nonsparse_inode(inode, pos, len, wc);
if (ret) {
mlog_errno(ret);
- goto out_meta;
+ goto out;
}
- /* phys == 0 means that allocation is required. */
- if (phys == 0) {
- ret = ocfs2_lock_allocators(inode, di, 1, &data_ac, &meta_ac);
+ ret = ocfs2_check_range_for_refcount(inode, pos, len);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ } else if (ret == 1) {
+ ret = ocfs2_refcount_cow(inode, di_bh,
+ wc->w_cpos, wc->w_clen, UINT_MAX);
if (ret) {
mlog_errno(ret);
- goto out_meta;
+ goto out;
}
-
- credits = ocfs2_calc_extend_credits(inode->i_sb, di, 1);
}
- ret = ocfs2_data_lock(inode, 1);
+ ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc,
+ &extents_to_split);
if (ret) {
mlog_errno(ret);
- goto out_meta;
+ goto out;
+ }
+
+ di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
+
+ /*
+ * We set w_target_from, w_target_to here so that
+ * ocfs2_write_end() knows which range in the target page to
+ * write out. An allocation requires that we write the entire
+ * cluster range.
+ */
+ if (clusters_to_alloc || extents_to_split) {
+ /*
+ * XXX: We are stretching the limits of
+ * ocfs2_lock_allocators(). It greatly over-estimates
+ * the work to be done.
+ */
+ mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u,"
+ " clusters_to_add = %u, extents_to_split = %u\n",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno,
+ (long long)i_size_read(inode), le32_to_cpu(di->i_clusters),
+ clusters_to_alloc, extents_to_split);
+
+ ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
+ wc->w_di_bh);
+ ret = ocfs2_lock_allocators(inode, &et,
+ clusters_to_alloc, extents_to_split,
+ &data_ac, &meta_ac);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ credits = ocfs2_calc_extend_credits(inode->i_sb,
+ &di->id2.i_list,
+ clusters_to_alloc);
+
}
+ /*
+ * We have to zero sparse allocated clusters, unwritten extent clusters,
+ * and non-sparse clusters we just extended. For non-sparse writes,
+ * we know zeros will only be needed in the first and/or last cluster.
+ */
+ if (clusters_to_alloc || extents_to_split ||
+ (wc->w_clen && (wc->w_desc[0].c_needs_zero ||
+ wc->w_desc[wc->w_clen - 1].c_needs_zero)))
+ cluster_of_pages = 1;
+ else
+ cluster_of_pages = 0;
+
+ ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages);
+
handle = ocfs2_start_trans(osb, credits);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
- goto out_data;
+ goto out;
}
- written = ocfs2_write(file, phys, handle, di_bh, data_ac,
- meta_ac, &wc);
- if (written < 0) {
- ret = written;
- mlog_errno(ret);
+ wc->w_handle = handle;
+
+ if (clusters_to_alloc && vfs_dq_alloc_space_nodirty(inode,
+ ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc))) {
+ ret = -EDQUOT;
goto out_commit;
}
+ /*
+ * We don't want this to fail in ocfs2_write_end(), so do it
+ * here.
+ */
+ ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_quota;
+ }
- ret = ocfs2_journal_access(handle, inode, di_bh,
- OCFS2_JOURNAL_ACCESS_WRITE);
+ /*
+ * Fill our page array first. That way we've grabbed enough so
+ * that we can zero and flush if we error after adding the
+ * extent.
+ */
+ ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos,
+ cluster_of_pages, mmap_page);
if (ret) {
mlog_errno(ret);
- goto out_commit;
+ goto out_quota;
+ }
+
+ ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos,
+ len);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_quota;
+ }
+
+ if (data_ac)
+ ocfs2_free_alloc_context(data_ac);
+ if (meta_ac)
+ ocfs2_free_alloc_context(meta_ac);
+
+success:
+ *pagep = wc->w_target_page;
+ *fsdata = wc;
+ return 0;
+out_quota:
+ if (clusters_to_alloc)
+ vfs_dq_free_space(inode,
+ ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
+out_commit:
+ ocfs2_commit_trans(osb, handle);
+
+out:
+ ocfs2_free_write_ctxt(wc);
+
+ if (data_ac)
+ ocfs2_free_alloc_context(data_ac);
+ if (meta_ac)
+ ocfs2_free_alloc_context(meta_ac);
+ return ret;
+}
+
+static int ocfs2_write_begin(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
+{
+ int ret;
+ struct buffer_head *di_bh = NULL;
+ struct inode *inode = mapping->host;
+
+ ret = ocfs2_inode_lock(inode, &di_bh, 1);
+ if (ret) {
+ mlog_errno(ret);
+ return ret;
+ }
+
+ /*
+ * Take alloc sem here to prevent concurrent lookups. That way
+ * the mapping, zeroing and tree manipulation within
+ * ocfs2_write() will be safe against ->readpage(). This
+ * should also serve to lock out allocation from a shared
+ * writeable region.
+ */
+ down_write(&OCFS2_I(inode)->ip_alloc_sem);
+
+ ret = ocfs2_write_begin_nolock(mapping, pos, len, flags, pagep,
+ fsdata, di_bh, NULL);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_fail;
+ }
+
+ brelse(di_bh);
+
+ return 0;
+
+out_fail:
+ up_write(&OCFS2_I(inode)->ip_alloc_sem);
+
+ brelse(di_bh);
+ ocfs2_inode_unlock(inode, 1);
+
+ return ret;
+}
+
+static void ocfs2_write_end_inline(struct inode *inode, loff_t pos,
+ unsigned len, unsigned *copied,
+ struct ocfs2_dinode *di,
+ struct ocfs2_write_ctxt *wc)
+{
+ void *kaddr;
+
+ if (unlikely(*copied < len)) {
+ if (!PageUptodate(wc->w_target_page)) {
+ *copied = 0;
+ return;
+ }
}
- pos += written;
+ kaddr = kmap_atomic(wc->w_target_page, KM_USER0);
+ memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied);
+ kunmap_atomic(kaddr, KM_USER0);
+
+ mlog(0, "Data written to inode at offset %llu. "
+ "id_count = %u, copied = %u, i_dyn_features = 0x%x\n",
+ (unsigned long long)pos, *copied,
+ le16_to_cpu(di->id2.i_data.id_count),
+ le16_to_cpu(di->i_dyn_features));
+}
+
+int ocfs2_write_end_nolock(struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata)
+{
+ int i;
+ unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1);
+ struct inode *inode = mapping->host;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct ocfs2_write_ctxt *wc = fsdata;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
+ handle_t *handle = wc->w_handle;
+ struct page *tmppage;
+
+ if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
+ ocfs2_write_end_inline(inode, pos, len, &copied, di, wc);
+ goto out_write_size;
+ }
+
+ if (unlikely(copied < len)) {
+ if (!PageUptodate(wc->w_target_page))
+ copied = 0;
+
+ ocfs2_zero_new_buffers(wc->w_target_page, start+copied,
+ start+len);
+ }
+ flush_dcache_page(wc->w_target_page);
+
+ for(i = 0; i < wc->w_num_pages; i++) {
+ tmppage = wc->w_pages[i];
+
+ if (tmppage == wc->w_target_page) {
+ from = wc->w_target_from;
+ to = wc->w_target_to;
+
+ BUG_ON(from > PAGE_CACHE_SIZE ||
+ to > PAGE_CACHE_SIZE ||
+ to < from);
+ } else {
+ /*
+ * Pages adjacent to the target (if any) imply
+ * a hole-filling write in which case we want
+ * to flush their entire range.
+ */
+ from = 0;
+ to = PAGE_CACHE_SIZE;
+ }
+
+ if (page_has_buffers(tmppage)) {
+ if (ocfs2_should_order_data(inode))
+ ocfs2_jbd2_file_inode(wc->w_handle, inode);
+ block_commit_write(tmppage, from, to);
+ }
+ }
+
+out_write_size:
+ pos += copied;
if (pos > inode->i_size) {
i_size_write(inode, pos);
mark_inode_dirty(inode);
}
- inode->i_blocks = ocfs2_align_bytes_to_sectors((u64)(i_size_read(inode)));
+ inode->i_blocks = ocfs2_inode_sector_count(inode);
di->i_size = cpu_to_le64((u64)i_size_read(inode));
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
+ ocfs2_journal_dirty(handle, wc->w_di_bh);
- ret = ocfs2_journal_dirty(handle, di_bh);
- if (ret)
- mlog_errno(ret);
-
-out_commit:
ocfs2_commit_trans(osb, handle);
-out_data:
- ocfs2_data_unlock(inode, 1);
+ ocfs2_run_deallocs(osb, &wc->w_dealloc);
-out_meta:
- up_write(&OCFS2_I(inode)->ip_alloc_sem);
- ocfs2_meta_unlock(inode, 1);
+ ocfs2_free_write_ctxt(wc);
-out:
- brelse(di_bh);
- if (data_ac)
- ocfs2_free_alloc_context(data_ac);
- if (meta_ac)
- ocfs2_free_alloc_context(meta_ac);
+ return copied;
+}
- return written ? written : ret;
+static int ocfs2_write_end(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata)
+{
+ int ret;
+ struct inode *inode = mapping->host;
+
+ ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata);
+
+ up_write(&OCFS2_I(inode)->ip_alloc_sem);
+ ocfs2_inode_unlock(inode, 1);
+
+ return ret;
}
const struct address_space_operations ocfs2_aops = {
- .readpage = ocfs2_readpage,
- .writepage = ocfs2_writepage,
- .bmap = ocfs2_bmap,
- .sync_page = block_sync_page,
- .direct_IO = ocfs2_direct_IO,
- .invalidatepage = ocfs2_invalidatepage,
- .releasepage = ocfs2_releasepage,
- .migratepage = buffer_migrate_page,
+ .readpage = ocfs2_readpage,
+ .readpages = ocfs2_readpages,
+ .writepage = ocfs2_writepage,
+ .write_begin = ocfs2_write_begin,
+ .write_end = ocfs2_write_end,
+ .bmap = ocfs2_bmap,
+ .sync_page = block_sync_page,
+ .direct_IO = ocfs2_direct_IO,
+ .invalidatepage = ocfs2_invalidatepage,
+ .releasepage = ocfs2_releasepage,
+ .migratepage = buffer_migrate_page,
+ .is_partially_uptodate = block_is_partially_uptodate,
+ .error_remove_page = generic_error_remove_page,
};
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff