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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/reiserfs/inode.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/reiserfs/inode.c')
-rw-r--r--fs/reiserfs/inode.c2846
1 files changed, 2846 insertions, 0 deletions
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
new file mode 100644
index 00000000000..7543031396f
--- /dev/null
+++ b/fs/reiserfs/inode.c
@@ -0,0 +1,2846 @@
+/*
+ * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
+ */
+
+#include <linux/config.h>
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/reiserfs_fs.h>
+#include <linux/reiserfs_acl.h>
+#include <linux/reiserfs_xattr.h>
+#include <linux/smp_lock.h>
+#include <linux/pagemap.h>
+#include <linux/highmem.h>
+#include <asm/uaccess.h>
+#include <asm/unaligned.h>
+#include <linux/buffer_head.h>
+#include <linux/mpage.h>
+#include <linux/writeback.h>
+#include <linux/quotaops.h>
+
+extern int reiserfs_default_io_size; /* default io size devuned in super.c */
+
+static int reiserfs_commit_write(struct file *f, struct page *page,
+ unsigned from, unsigned to);
+static int reiserfs_prepare_write(struct file *f, struct page *page,
+ unsigned from, unsigned to);
+
+void reiserfs_delete_inode (struct inode * inode)
+{
+ /* We need blocks for transaction + (user+group) quota update (possibly delete) */
+ int jbegin_count = JOURNAL_PER_BALANCE_CNT * 2 + 2 * REISERFS_QUOTA_INIT_BLOCKS;
+ struct reiserfs_transaction_handle th ;
+
+ reiserfs_write_lock(inode->i_sb);
+
+ /* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */
+ if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */
+ down (&inode->i_sem);
+
+ reiserfs_delete_xattrs (inode);
+
+ if (journal_begin(&th, inode->i_sb, jbegin_count)) {
+ up (&inode->i_sem);
+ goto out;
+ }
+ reiserfs_update_inode_transaction(inode) ;
+
+ if (reiserfs_delete_object (&th, inode)) {
+ up (&inode->i_sem);
+ goto out;
+ }
+
+ /* Do quota update inside a transaction for journaled quotas. We must do that
+ * after delete_object so that quota updates go into the same transaction as
+ * stat data deletion */
+ DQUOT_FREE_INODE(inode);
+
+ if (journal_end(&th, inode->i_sb, jbegin_count)) {
+ up (&inode->i_sem);
+ goto out;
+ }
+
+ up (&inode->i_sem);
+
+ /* all items of file are deleted, so we can remove "save" link */
+ remove_save_link (inode, 0/* not truncate */); /* we can't do anything
+ * about an error here */
+ } else {
+ /* no object items are in the tree */
+ ;
+ }
+out:
+ clear_inode (inode); /* note this must go after the journal_end to prevent deadlock */
+ inode->i_blocks = 0;
+ reiserfs_write_unlock(inode->i_sb);
+}
+
+static void _make_cpu_key (struct cpu_key * key, int version, __u32 dirid, __u32 objectid,
+ loff_t offset, int type, int length )
+{
+ key->version = version;
+
+ key->on_disk_key.k_dir_id = dirid;
+ key->on_disk_key.k_objectid = objectid;
+ set_cpu_key_k_offset (key, offset);
+ set_cpu_key_k_type (key, type);
+ key->key_length = length;
+}
+
+
+/* take base of inode_key (it comes from inode always) (dirid, objectid) and version from an inode, set
+ offset and type of key */
+void make_cpu_key (struct cpu_key * key, struct inode * inode, loff_t offset,
+ int type, int length )
+{
+ _make_cpu_key (key, get_inode_item_key_version (inode), le32_to_cpu (INODE_PKEY (inode)->k_dir_id),
+ le32_to_cpu (INODE_PKEY (inode)->k_objectid),
+ offset, type, length);
+}
+
+
+//
+// when key is 0, do not set version and short key
+//
+inline void make_le_item_head (struct item_head * ih, const struct cpu_key * key,
+ int version,
+ loff_t offset, int type, int length,
+ int entry_count/*or ih_free_space*/)
+{
+ if (key) {
+ ih->ih_key.k_dir_id = cpu_to_le32 (key->on_disk_key.k_dir_id);
+ ih->ih_key.k_objectid = cpu_to_le32 (key->on_disk_key.k_objectid);
+ }
+ put_ih_version( ih, version );
+ set_le_ih_k_offset (ih, offset);
+ set_le_ih_k_type (ih, type);
+ put_ih_item_len( ih, length );
+ /* set_ih_free_space (ih, 0);*/
+ // for directory items it is entry count, for directs and stat
+ // datas - 0xffff, for indirects - 0
+ put_ih_entry_count( ih, entry_count );
+}
+
+//
+// FIXME: we might cache recently accessed indirect item
+
+// Ugh. Not too eager for that....
+// I cut the code until such time as I see a convincing argument (benchmark).
+// I don't want a bloated inode struct..., and I don't like code complexity....
+
+/* cutting the code is fine, since it really isn't in use yet and is easy
+** to add back in. But, Vladimir has a really good idea here. Think
+** about what happens for reading a file. For each page,
+** The VFS layer calls reiserfs_readpage, who searches the tree to find
+** an indirect item. This indirect item has X number of pointers, where
+** X is a big number if we've done the block allocation right. But,
+** we only use one or two of these pointers during each call to readpage,
+** needlessly researching again later on.
+**
+** The size of the cache could be dynamic based on the size of the file.
+**
+** I'd also like to see us cache the location the stat data item, since
+** we are needlessly researching for that frequently.
+**
+** --chris
+*/
+
+/* If this page has a file tail in it, and
+** it was read in by get_block_create_0, the page data is valid,
+** but tail is still sitting in a direct item, and we can't write to
+** it. So, look through this page, and check all the mapped buffers
+** to make sure they have valid block numbers. Any that don't need
+** to be unmapped, so that block_prepare_write will correctly call
+** reiserfs_get_block to convert the tail into an unformatted node
+*/
+static inline void fix_tail_page_for_writing(struct page *page) {
+ struct buffer_head *head, *next, *bh ;
+
+ if (page && page_has_buffers(page)) {
+ head = page_buffers(page) ;
+ bh = head ;
+ do {
+ next = bh->b_this_page ;
+ if (buffer_mapped(bh) && bh->b_blocknr == 0) {
+ reiserfs_unmap_buffer(bh) ;
+ }
+ bh = next ;
+ } while (bh != head) ;
+ }
+}
+
+/* reiserfs_get_block does not need to allocate a block only if it has been
+ done already or non-hole position has been found in the indirect item */
+static inline int allocation_needed (int retval, b_blocknr_t allocated,
+ struct item_head * ih,
+ __u32 * item, int pos_in_item)
+{
+ if (allocated)
+ return 0;
+ if (retval == POSITION_FOUND && is_indirect_le_ih (ih) &&
+ get_block_num(item, pos_in_item))
+ return 0;
+ return 1;
+}
+
+static inline int indirect_item_found (int retval, struct item_head * ih)
+{
+ return (retval == POSITION_FOUND) && is_indirect_le_ih (ih);
+}
+
+
+static inline void set_block_dev_mapped (struct buffer_head * bh,
+ b_blocknr_t block, struct inode * inode)
+{
+ map_bh(bh, inode->i_sb, block);
+}
+
+
+//
+// files which were created in the earlier version can not be longer,
+// than 2 gb
+//
+static int file_capable (struct inode * inode, long block)
+{
+ if (get_inode_item_key_version (inode) != KEY_FORMAT_3_5 || // it is new file.
+ block < (1 << (31 - inode->i_sb->s_blocksize_bits))) // old file, but 'block' is inside of 2gb
+ return 1;
+
+ return 0;
+}
+
+/*static*/ int restart_transaction(struct reiserfs_transaction_handle *th,
+ struct inode *inode, struct path *path) {
+ struct super_block *s = th->t_super ;
+ int len = th->t_blocks_allocated ;
+ int err;
+
+ BUG_ON (!th->t_trans_id);
+ BUG_ON (!th->t_refcount);
+
+ /* we cannot restart while nested */
+ if (th->t_refcount > 1) {
+ return 0 ;
+ }
+ pathrelse(path) ;
+ reiserfs_update_sd(th, inode) ;
+ err = journal_end(th, s, len) ;
+ if (!err) {
+ err = journal_begin(th, s, JOURNAL_PER_BALANCE_CNT * 6) ;
+ if (!err)
+ reiserfs_update_inode_transaction(inode) ;
+ }
+ return err;
+}
+
+// it is called by get_block when create == 0. Returns block number
+// for 'block'-th logical block of file. When it hits direct item it
+// returns 0 (being called from bmap) or read direct item into piece
+// of page (bh_result)
+
+// Please improve the english/clarity in the comment above, as it is
+// hard to understand.
+
+static int _get_block_create_0 (struct inode * inode, long block,
+ struct buffer_head * bh_result,
+ int args)
+{
+ INITIALIZE_PATH (path);
+ struct cpu_key key;
+ struct buffer_head * bh;
+ struct item_head * ih, tmp_ih;
+ int fs_gen ;
+ int blocknr;
+ char * p = NULL;
+ int chars;
+ int ret ;
+ int done = 0 ;
+ unsigned long offset ;
+
+ // prepare the key to look for the 'block'-th block of file
+ make_cpu_key (&key, inode,
+ (loff_t)block * inode->i_sb->s_blocksize + 1, TYPE_ANY, 3);
+
+research:
+ if (search_for_position_by_key (inode->i_sb, &key, &path) != POSITION_FOUND) {
+ pathrelse (&path);
+ if (p)
+ kunmap(bh_result->b_page) ;
+ // We do not return -ENOENT if there is a hole but page is uptodate, because it means
+ // That there is some MMAPED data associated with it that is yet to be written to disk.
+ if ((args & GET_BLOCK_NO_HOLE) && !PageUptodate(bh_result->b_page) ) {
+ return -ENOENT ;
+ }
+ return 0 ;
+ }
+
+ //
+ bh = get_last_bh (&path);
+ ih = get_ih (&path);
+ if (is_indirect_le_ih (ih)) {
+ __u32 * ind_item = (__u32 *)B_I_PITEM (bh, ih);
+
+ /* FIXME: here we could cache indirect item or part of it in
+ the inode to avoid search_by_key in case of subsequent
+ access to file */
+ blocknr = get_block_num(ind_item, path.pos_in_item) ;
+ ret = 0 ;
+ if (blocknr) {
+ map_bh(bh_result, inode->i_sb, blocknr);
+ if (path.pos_in_item == ((ih_item_len(ih) / UNFM_P_SIZE) - 1)) {
+ set_buffer_boundary(bh_result);
+ }
+ } else
+ // We do not return -ENOENT if there is a hole but page is uptodate, because it means
+ // That there is some MMAPED data associated with it that is yet to be written to disk.
+ if ((args & GET_BLOCK_NO_HOLE) && !PageUptodate(bh_result->b_page) ) {
+ ret = -ENOENT ;
+ }
+
+ pathrelse (&path);
+ if (p)
+ kunmap(bh_result->b_page) ;
+ return ret ;
+ }
+
+ // requested data are in direct item(s)
+ if (!(args & GET_BLOCK_READ_DIRECT)) {
+ // we are called by bmap. FIXME: we can not map block of file
+ // when it is stored in direct item(s)
+ pathrelse (&path);
+ if (p)
+ kunmap(bh_result->b_page) ;
+ return -ENOENT;
+ }
+
+ /* if we've got a direct item, and the buffer or page was uptodate,
+ ** we don't want to pull data off disk again. skip to the
+ ** end, where we map the buffer and return
+ */
+ if (buffer_uptodate(bh_result)) {
+ goto finished ;
+ } else
+ /*
+ ** grab_tail_page can trigger calls to reiserfs_get_block on up to date
+ ** pages without any buffers. If the page is up to date, we don't want
+ ** read old data off disk. Set the up to date bit on the buffer instead
+ ** and jump to the end
+ */
+ if (!bh_result->b_page || PageUptodate(bh_result->b_page)) {
+ set_buffer_uptodate(bh_result);
+ goto finished ;
+ }
+
+ // read file tail into part of page
+ offset = (cpu_key_k_offset(&key) - 1) & (PAGE_CACHE_SIZE - 1) ;
+ fs_gen = get_generation(inode->i_sb) ;
+ copy_item_head (&tmp_ih, ih);
+
+ /* we only want to kmap if we are reading the tail into the page.
+ ** this is not the common case, so we don't kmap until we are
+ ** sure we need to. But, this means the item might move if
+ ** kmap schedules
+ */
+ if (!p) {
+ p = (char *)kmap(bh_result->b_page) ;
+ if (fs_changed (fs_gen, inode->i_sb) && item_moved (&tmp_ih, &path)) {
+ goto research;
+ }
+ }
+ p += offset ;
+ memset (p, 0, inode->i_sb->s_blocksize);
+ do {
+ if (!is_direct_le_ih (ih)) {
+ BUG ();
+ }
+ /* make sure we don't read more bytes than actually exist in
+ ** the file. This can happen in odd cases where i_size isn't
+ ** correct, and when direct item padding results in a few
+ ** extra bytes at the end of the direct item
+ */
+ if ((le_ih_k_offset(ih) + path.pos_in_item) > inode->i_size)
+ break ;
+ if ((le_ih_k_offset(ih) - 1 + ih_item_len(ih)) > inode->i_size) {
+ chars = inode->i_size - (le_ih_k_offset(ih) - 1) - path.pos_in_item;
+ done = 1 ;
+ } else {
+ chars = ih_item_len(ih) - path.pos_in_item;
+ }
+ memcpy (p, B_I_PITEM (bh, ih) + path.pos_in_item, chars);
+
+ if (done)
+ break ;
+
+ p += chars;
+
+ if (PATH_LAST_POSITION (&path) != (B_NR_ITEMS (bh) - 1))
+ // we done, if read direct item is not the last item of
+ // node FIXME: we could try to check right delimiting key
+ // to see whether direct item continues in the right
+ // neighbor or rely on i_size
+ break;
+
+ // update key to look for the next piece
+ set_cpu_key_k_offset (&key, cpu_key_k_offset (&key) + chars);
+ if (search_for_position_by_key (inode->i_sb, &key, &path) != POSITION_FOUND)
+ // we read something from tail, even if now we got IO_ERROR
+ break;
+ bh = get_last_bh (&path);
+ ih = get_ih (&path);
+ } while (1);
+
+ flush_dcache_page(bh_result->b_page) ;
+ kunmap(bh_result->b_page) ;
+
+finished:
+ pathrelse (&path);
+ /* this buffer has valid data, but isn't valid for io. mapping it to
+ * block #0 tells the rest of reiserfs it just has a tail in it
+ */
+ map_bh(bh_result, inode->i_sb, 0);
+ set_buffer_uptodate (bh_result);
+ return 0;
+}
+
+
+// this is called to create file map. So, _get_block_create_0 will not
+// read direct item
+static int reiserfs_bmap (struct inode * inode, sector_t block,
+ struct buffer_head * bh_result, int create)
+{
+ if (!file_capable (inode, block))
+ return -EFBIG;
+
+ reiserfs_write_lock(inode->i_sb);
+ /* do not read the direct item */
+ _get_block_create_0 (inode, block, bh_result, 0) ;
+ reiserfs_write_unlock(inode->i_sb);
+ return 0;
+}
+
+/* special version of get_block that is only used by grab_tail_page right
+** now. It is sent to block_prepare_write, and when you try to get a
+** block past the end of the file (or a block from a hole) it returns
+** -ENOENT instead of a valid buffer. block_prepare_write expects to
+** be able to do i/o on the buffers returned, unless an error value
+** is also returned.
+**
+** So, this allows block_prepare_write to be used for reading a single block
+** in a page. Where it does not produce a valid page for holes, or past the
+** end of the file. This turns out to be exactly what we need for reading
+** tails for conversion.
+**
+** The point of the wrapper is forcing a certain value for create, even
+** though the VFS layer is calling this function with create==1. If you
+** don't want to send create == GET_BLOCK_NO_HOLE to reiserfs_get_block,
+** don't use this function.
+*/
+static int reiserfs_get_block_create_0 (struct inode * inode, sector_t block,
+ struct buffer_head * bh_result, int create) {
+ return reiserfs_get_block(inode, block, bh_result, GET_BLOCK_NO_HOLE) ;
+}
+
+/* This is special helper for reiserfs_get_block in case we are executing
+ direct_IO request. */
+static int reiserfs_get_blocks_direct_io(struct inode *inode,
+ sector_t iblock,
+ unsigned long max_blocks,
+ struct buffer_head *bh_result,
+ int create)
+{
+ int ret ;
+
+ bh_result->b_page = NULL;
+
+ /* We set the b_size before reiserfs_get_block call since it is
+ referenced in convert_tail_for_hole() that may be called from
+ reiserfs_get_block() */
+ bh_result->b_size = (1 << inode->i_blkbits);
+
+ ret = reiserfs_get_block(inode, iblock, bh_result,
+ create | GET_BLOCK_NO_DANGLE) ;
+ if (ret)
+ goto out;
+
+ /* don't allow direct io onto tail pages */
+ if (buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
+ /* make sure future calls to the direct io funcs for this offset
+ ** in the file fail by unmapping the buffer
+ */
+ clear_buffer_mapped(bh_result);
+ ret = -EINVAL ;
+ }
+ /* Possible unpacked tail. Flush the data before pages have
+ disappeared */
+ if (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) {
+ int err;
+ lock_kernel();
+ err = reiserfs_commit_for_inode(inode);
+ REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
+ unlock_kernel();
+ if (err < 0)
+ ret = err;
+ }
+out:
+ return ret ;
+}
+
+
+/*
+** helper function for when reiserfs_get_block is called for a hole
+** but the file tail is still in a direct item
+** bh_result is the buffer head for the hole
+** tail_offset is the offset of the start of the tail in the file
+**
+** This calls prepare_write, which will start a new transaction
+** you should not be in a transaction, or have any paths held when you
+** call this.
+*/
+static int convert_tail_for_hole(struct inode *inode,
+ struct buffer_head *bh_result,
+ loff_t tail_offset) {
+ unsigned long index ;
+ unsigned long tail_end ;
+ unsigned long tail_start ;
+ struct page * tail_page ;
+ struct page * hole_page = bh_result->b_page ;
+ int retval = 0 ;
+
+ if ((tail_offset & (bh_result->b_size - 1)) != 1)
+ return -EIO ;
+
+ /* always try to read until the end of the block */
+ tail_start = tail_offset & (PAGE_CACHE_SIZE - 1) ;
+ tail_end = (tail_start | (bh_result->b_size - 1)) + 1 ;
+
+ index = tail_offset >> PAGE_CACHE_SHIFT ;
+ /* hole_page can be zero in case of direct_io, we are sure
+ that we cannot get here if we write with O_DIRECT into
+ tail page */
+ if (!hole_page || index != hole_page->index) {
+ tail_page = grab_cache_page(inode->i_mapping, index) ;
+ retval = -ENOMEM;
+ if (!tail_page) {
+ goto out ;
+ }
+ } else {
+ tail_page = hole_page ;
+ }
+
+ /* we don't have to make sure the conversion did not happen while
+ ** we were locking the page because anyone that could convert
+ ** must first take i_sem.
+ **
+ ** We must fix the tail page for writing because it might have buffers
+ ** that are mapped, but have a block number of 0. This indicates tail
+ ** data that has been read directly into the page, and block_prepare_write
+ ** won't trigger a get_block in this case.
+ */
+ fix_tail_page_for_writing(tail_page) ;
+ retval = reiserfs_prepare_write(NULL, tail_page, tail_start, tail_end);
+ if (retval)
+ goto unlock ;
+
+ /* tail conversion might change the data in the page */
+ flush_dcache_page(tail_page) ;
+
+ retval = reiserfs_commit_write(NULL, tail_page, tail_start, tail_end) ;
+
+unlock:
+ if (tail_page != hole_page) {
+ unlock_page(tail_page) ;
+ page_cache_release(tail_page) ;
+ }
+out:
+ return retval ;
+}
+
+static inline int _allocate_block(struct reiserfs_transaction_handle *th,
+ long block,
+ struct inode *inode,
+ b_blocknr_t *allocated_block_nr,
+ struct path * path,
+ int flags) {
+ BUG_ON (!th->t_trans_id);
+
+#ifdef REISERFS_PREALLOCATE
+ if (!(flags & GET_BLOCK_NO_ISEM)) {
+ return reiserfs_new_unf_blocknrs2(th, inode, allocated_block_nr, path, block);
+ }
+#endif
+ return reiserfs_new_unf_blocknrs (th, inode, allocated_block_nr, path, block);
+}
+
+int reiserfs_get_block (struct inode * inode, sector_t block,
+ struct buffer_head * bh_result, int create)
+{
+ int repeat, retval = 0;
+ b_blocknr_t allocated_block_nr = 0;// b_blocknr_t is (unsigned) 32 bit int
+ INITIALIZE_PATH(path);
+ int pos_in_item;
+ struct cpu_key key;
+ struct buffer_head * bh, * unbh = NULL;
+ struct item_head * ih, tmp_ih;
+ __u32 * item;
+ int done;
+ int fs_gen;
+ struct reiserfs_transaction_handle *th = NULL;
+ /* space reserved in transaction batch:
+ . 3 balancings in direct->indirect conversion
+ . 1 block involved into reiserfs_update_sd()
+ XXX in practically impossible worst case direct2indirect()
+ can incur (much) more than 3 balancings.
+ quota update for user, group */
+ int jbegin_count = JOURNAL_PER_BALANCE_CNT * 3 + 1 + 2 * REISERFS_QUOTA_TRANS_BLOCKS;
+ int version;
+ int dangle = 1;
+ loff_t new_offset = (((loff_t)block) << inode->i_sb->s_blocksize_bits) + 1 ;
+
+ /* bad.... */
+ reiserfs_write_lock(inode->i_sb);
+ version = get_inode_item_key_version (inode);
+
+ if (block < 0) {
+ reiserfs_write_unlock(inode->i_sb);
+ return -EIO;
+ }
+
+ if (!file_capable (inode, block)) {
+ reiserfs_write_unlock(inode->i_sb);
+ return -EFBIG;
+ }
+
+ /* if !create, we aren't changing the FS, so we don't need to
+ ** log anything, so we don't need to start a transaction
+ */
+ if (!(create & GET_BLOCK_CREATE)) {
+ int ret ;
+ /* find number of block-th logical block of the file */
+ ret = _get_block_create_0 (inode, block, bh_result,
+ create | GET_BLOCK_READ_DIRECT) ;
+ reiserfs_write_unlock(inode->i_sb);
+ return ret;
+ }
+ /*
+ * if we're already in a transaction, make sure to close
+ * any new transactions we start in this func
+ */
+ if ((create & GET_BLOCK_NO_DANGLE) ||
+ reiserfs_transaction_running(inode->i_sb))
+ dangle = 0;
+
+ /* If file is of such a size, that it might have a tail and tails are enabled
+ ** we should mark it as possibly needing tail packing on close
+ */
+ if ( (have_large_tails (inode->i_sb) && inode->i_size < i_block_size (inode)*4) ||
+ (have_small_tails (inode->i_sb) && inode->i_size < i_block_size(inode)) )
+ REISERFS_I(inode)->i_flags |= i_pack_on_close_mask ;
+
+ /* set the key of the first byte in the 'block'-th block of file */
+ make_cpu_key (&key, inode, new_offset,
+ TYPE_ANY, 3/*key length*/);
+ if ((new_offset + inode->i_sb->s_blocksize - 1) > inode->i_size) {
+start_trans:
+ th = reiserfs_persistent_transaction(inode->i_sb, jbegin_count);
+ if (!th) {
+ retval = -ENOMEM;
+ goto failure;
+ }
+ reiserfs_update_inode_transaction(inode) ;
+ }
+ research:
+
+ retval = search_for_position_by_key (inode->i_sb, &key, &path);
+ if (retval == IO_ERROR) {
+ retval = -EIO;
+ goto failure;
+ }
+
+ bh = get_last_bh (&path);
+ ih = get_ih (&path);
+ item = get_item (&path);
+ pos_in_item = path.pos_in_item;
+
+ fs_gen = get_generation (inode->i_sb);
+ copy_item_head (&tmp_ih, ih);
+
+ if (allocation_needed (retval, allocated_block_nr, ih, item, pos_in_item)) {
+ /* we have to allocate block for the unformatted node */
+ if (!th) {
+ pathrelse(&path) ;
+ goto start_trans;
+ }
+
+ repeat = _allocate_block(th, block, inode, &allocated_block_nr, &path, create);
+
+ if (repeat == NO_DISK_SPACE || repeat == QUOTA_EXCEEDED) {
+ /* restart the transaction to give the journal a chance to free
+ ** some blocks. releases the path, so we have to go back to
+ ** research if we succeed on the second try
+ */
+ SB_JOURNAL(inode->i_sb)->j_next_async_flush = 1;
+ retval = restart_transaction(th, inode, &path) ;
+ if (retval)
+ goto failure;
+ repeat = _allocate_block(th, block, inode, &allocated_block_nr, NULL, create);
+
+ if (repeat != NO_DISK_SPACE && repeat != QUOTA_EXCEEDED) {
+ goto research ;
+ }
+ if (repeat == QUOTA_EXCEEDED)
+ retval = -EDQUOT;
+ else
+ retval = -ENOSPC;
+ goto failure;
+ }
+
+ if (fs_changed (fs_gen, inode->i_sb) && item_moved (&tmp_ih, &path)) {
+ goto research;
+ }
+ }
+
+ if (indirect_item_found (retval, ih)) {
+ b_blocknr_t unfm_ptr;
+ /* 'block'-th block is in the file already (there is
+ corresponding cell in some indirect item). But it may be
+ zero unformatted node pointer (hole) */
+ unfm_ptr = get_block_num (item, pos_in_item);
+ if (unfm_ptr == 0) {
+ /* use allocated block to plug the hole */
+ reiserfs_prepare_for_journal(inode->i_sb, bh, 1) ;
+ if (fs_changed (fs_gen, inode->i_sb) && item_moved (&tmp_ih, &path)) {
+ reiserfs_restore_prepared_buffer(inode->i_sb, bh) ;
+ goto research;
+ }
+ set_buffer_new(bh_result);
+ if (buffer_dirty(bh_result) && reiserfs_data_ordered(inode->i_sb))
+ reiserfs_add_ordered_list(inode, bh_result);
+ put_block_num(item, pos_in_item, allocated_block_nr) ;
+ unfm_ptr = allocated_block_nr;
+ journal_mark_dirty (th, inode->i_sb, bh);
+ reiserfs_update_sd(th, inode) ;
+ }
+ set_block_dev_mapped(bh_result, unfm_ptr, inode);
+ pathrelse (&path);
+ retval = 0;
+ if (!dangle && th)
+ retval = reiserfs_end_persistent_transaction(th);
+
+ reiserfs_write_unlock(inode->i_sb);
+
+ /* the item was found, so new blocks were not added to the file
+ ** there is no need to make sure the inode is updated with this
+ ** transaction
+ */
+ return retval;
+ }
+
+ if (!th) {
+ pathrelse(&path) ;
+ goto start_trans;
+ }
+
+ /* desired position is not found or is in the direct item. We have
+ to append file with holes up to 'block'-th block converting
+ direct items to indirect one if necessary */
+ done = 0;
+ do {
+ if (is_statdata_le_ih (ih)) {
+ __u32 unp = 0;
+ struct cpu_key tmp_key;
+
+ /* indirect item has to be inserted */
+ make_le_item_head (&tmp_ih, &key, version, 1, TYPE_INDIRECT,
+ UNFM_P_SIZE, 0/* free_space */);
+
+ if (cpu_key_k_offset (&key) == 1) {
+ /* we are going to add 'block'-th block to the file. Use
+ allocated block for that */
+ unp = cpu_to_le32 (allocated_block_nr);
+ set_block_dev_mapped (bh_result, allocated_block_nr, inode);
+ set_buffer_new(bh_result);
+ done = 1;
+ }
+ tmp_key = key; // ;)
+ set_cpu_key_k_offset (&tmp_key, 1);
+ PATH_LAST_POSITION(&path) ++;
+
+ retval = reiserfs_insert_item (th, &path, &tmp_key, &tmp_ih, inode, (char *)&unp);
+ if (retval) {
+ reiserfs_free_block (th, inode, allocated_block_nr, 1);
+ goto failure; // retval == -ENOSPC, -EDQUOT or -EIO or -EEXIST
+ }
+ //mark_tail_converted (inode);
+ } else if (is_direct_le_ih (ih)) {
+ /* direct item has to be converted */
+ loff_t tail_offset;
+
+ tail_offset = ((le_ih_k_offset (ih) - 1) & ~(inode->i_sb->s_blocksize - 1)) + 1;
+ if (tail_offset == cpu_key_k_offset (&key)) {
+ /* direct item we just found fits into block we have
+ to map. Convert it into unformatted node: use
+ bh_result for the conversion */
+ set_block_dev_mapped (bh_result, allocated_block_nr, inode);
+ unbh = bh_result;
+ done = 1;
+ } else {
+ /* we have to padd file tail stored in direct item(s)
+ up to block size and convert it to unformatted
+ node. FIXME: this should also get into page cache */
+
+ pathrelse(&path) ;
+ /*
+ * ugly, but we can only end the transaction if
+ * we aren't nested
+ */
+ BUG_ON (!th->t_refcount);
+ if (th->t_refcount == 1) {
+ retval = reiserfs_end_persistent_transaction(th);
+ th = NULL;
+ if (retval)
+ goto failure;
+ }
+
+ retval = convert_tail_for_hole(inode, bh_result, tail_offset) ;
+ if (retval) {
+ if ( retval != -ENOSPC )
+ reiserfs_warning (inode->i_sb, "clm-6004: convert tail failed inode %lu, error %d", inode->i_ino, retval) ;
+ if (allocated_block_nr) {
+ /* the bitmap, the super, and the stat data == 3 */
+ if (!th)
+ th = reiserfs_persistent_transaction(inode->i_sb,3);
+ if (th)
+ reiserfs_free_block (th,inode,allocated_block_nr,1);
+ }
+ goto failure ;
+ }
+ goto research ;
+ }
+ retval = direct2indirect (th, inode, &path, unbh, tail_offset);
+ if (retval) {
+ reiserfs_unmap_buffer(unbh);
+ reiserfs_free_block (th, inode, allocated_block_nr, 1);
+ goto failure;
+ }
+ /* it is important the set_buffer_uptodate is done after
+ ** the direct2indirect. The buffer might contain valid
+ ** data newer than the data on disk (read by readpage, changed,
+ ** and then sent here by writepage). direct2indirect needs
+ ** to know if unbh was already up to date, so it can decide
+ ** if the data in unbh needs to be replaced with data from
+ ** the disk
+ */
+ set_buffer_uptodate (unbh);
+
+ /* unbh->b_page == NULL in case of DIRECT_IO request, this means
+ buffer will disappear shortly, so it should not be added to
+ */
+ if ( unbh->b_page ) {
+ /* we've converted the tail, so we must
+ ** flush unbh before the transaction commits
+ */
+ reiserfs_add_tail_list(inode, unbh) ;
+
+ /* mark it dirty now to prevent commit_write from adding
+ ** this buffer to the inode's dirty buffer list
+ */
+ /*
+ * AKPM: changed __mark_buffer_dirty to mark_buffer_dirty().
+ * It's still atomic, but it sets the page dirty too,
+ * which makes it eligible for writeback at any time by the
+ * VM (which was also the case with __mark_buffer_dirty())
+ */
+ mark_buffer_dirty(unbh) ;
+ }
+ } else {
+ /* append indirect item with holes if needed, when appending
+ pointer to 'block'-th block use block, which is already
+ allocated */
+ struct cpu_key tmp_key;
+ unp_t unf_single=0; // We use this in case we need to allocate only
+ // one block which is a fastpath
+ unp_t *un;
+ __u64 max_to_insert=MAX_ITEM_LEN(inode->i_sb->s_blocksize)/UNFM_P_SIZE;
+ __u64 blocks_needed;
+
+ RFALSE( pos_in_item != ih_item_len(ih) / UNFM_P_SIZE,
+ "vs-804: invalid position for append");
+ /* indirect item has to be appended, set up key of that position */
+ make_cpu_key (&tmp_key, inode,
+ le_key_k_offset (version, &(ih->ih_key)) + op_bytes_number (ih, inode->i_sb->s_blocksize),
+ //pos_in_item * inode->i_sb->s_blocksize,
+ TYPE_INDIRECT, 3);// key type is unimportant
+
+ blocks_needed = 1 + ((cpu_key_k_offset (&key) - cpu_key_k_offset (&tmp_key)) >> inode->i_sb->s_blocksize_bits);
+ RFALSE( blocks_needed < 0, "green-805: invalid offset");
+
+ if ( blocks_needed == 1 ) {
+ un = &unf_single;
+ } else {
+ un=kmalloc( min(blocks_needed,max_to_insert)*UNFM_P_SIZE,
+ GFP_ATOMIC); // We need to avoid scheduling.
+ if ( !un) {
+ un = &unf_single;
+ blocks_needed = 1;
+ max_to_insert = 0;
+ } else
+ memset(un, 0, UNFM_P_SIZE * min(blocks_needed,max_to_insert));
+ }
+ if ( blocks_needed <= max_to_insert) {
+ /* we are going to add target block to the file. Use allocated
+ block for that */
+ un[blocks_needed-1] = cpu_to_le32 (allocated_block_nr);
+ set_block_dev_mapped (bh_result, allocated_block_nr, inode);
+ set_buffer_new(bh_result);
+ done = 1;
+ } else {
+ /* paste hole to the indirect item */
+ /* If kmalloc failed, max_to_insert becomes zero and it means we
+ only have space for one block */
+ blocks_needed=max_to_insert?max_to_insert:1;
+ }
+ retval = reiserfs_paste_into_item (th, &path, &tmp_key, inode, (char *)un, UNFM_P_SIZE * blocks_needed);
+
+ if (blocks_needed != 1)
+ kfree(un);
+
+ if (retval) {
+ reiserfs_free_block (th, inode, allocated_block_nr, 1);
+ goto failure;
+ }
+ if (!done) {
+ /* We need to mark new file size in case this function will be
+ interrupted/aborted later on. And we may do this only for
+ holes. */
+ inode->i_size += inode->i_sb->s_blocksize * blocks_needed;
+ }
+ }
+
+ if (done == 1)
+ break;
+
+ /* this loop could log more blocks than we had originally asked
+ ** for. So, we have to allow the transaction to end if it is
+ ** too big or too full. Update the inode so things are
+ ** consistent if we crash before the function returns
+ **
+ ** release the path so that anybody waiting on the path before
+ ** ending their transaction will be able to continue.
+ */
+ if (journal_transaction_should_end(th, th->t_blocks_allocated)) {
+ retval = restart_transaction(th, inode, &path) ;
+ if (retval)
+ goto failure;
+ }
+ /* inserting indirect pointers for a hole can take a
+ ** long time. reschedule if needed
+ */
+ cond_resched();
+
+ retval = search_for_position_by_key (inode->i_sb, &key, &path);
+ if (retval == IO_ERROR) {
+ retval = -EIO;
+ goto failure;
+ }
+ if (retval == POSITION_FOUND) {
+ reiserfs_warning (inode->i_sb, "vs-825: reiserfs_get_block: "
+ "%K should not be found", &key);
+ retval = -EEXIST;
+ if (allocated_block_nr)
+ reiserfs_free_block (th, inode, allocated_block_nr, 1);
+ pathrelse(&path) ;
+ goto failure;
+ }
+ bh = get_last_bh (&path);
+ ih = get_ih (&path);
+ item = get_item (&path);
+ pos_in_item = path.pos_in_item;
+ } while (1);
+
+
+ retval = 0;
+
+ failure:
+ if (th && (!dangle || (retval && !th->t_trans_id))) {
+ int err;
+ if (th->t_trans_id)
+ reiserfs_update_sd(th, inode);
+ err = reiserfs_end_persistent_transaction(th);
+ if (err)
+ retval = err;
+ }
+
+ reiserfs_write_unlock(inode->i_sb);
+ reiserfs_check_path(&path) ;
+ return retval;
+}
+
+static int
+reiserfs_readpages(struct file *file, struct address_space *mapping,
+ struct list_head *pages, unsigned nr_pages)
+{
+ return mpage_readpages(mapping, pages, nr_pages, reiserfs_get_block);
+}
+
+/* Compute real number of used bytes by file
+ * Following three functions can go away when we'll have enough space in stat item
+ */
+static int real_space_diff(struct inode *inode, int sd_size)
+{
+ int bytes;
+ loff_t blocksize = inode->i_sb->s_blocksize ;
+
+ if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode))
+ return sd_size ;
+
+ /* End of file is also in full block with indirect reference, so round
+ ** up to the next block.
+ **
+ ** there is just no way to know if the tail is actually packed
+ ** on the file, so we have to assume it isn't. When we pack the
+ ** tail, we add 4 bytes to pretend there really is an unformatted
+ ** node pointer
+ */
+ bytes = ((inode->i_size + (blocksize-1)) >> inode->i_sb->s_blocksize_bits) * UNFM_P_SIZE + sd_size;
+ return bytes ;
+}
+
+static inline loff_t to_real_used_space(struct inode *inode, ulong blocks,
+ int sd_size)
+{
+ if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
+ return inode->i_size + (loff_t)(real_space_diff(inode, sd_size)) ;
+ }
+ return ((loff_t)real_space_diff(inode, sd_size)) + (((loff_t)blocks) << 9);
+}
+
+/* Compute number of blocks used by file in ReiserFS counting */
+static inline ulong to_fake_used_blocks(struct inode *inode, int sd_size)
+{
+ loff_t bytes = inode_get_bytes(inode) ;
+ loff_t real_space = real_space_diff(inode, sd_size) ;
+
+ /* keeps fsck and non-quota versions of reiserfs happy */
+ if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
+ bytes += (loff_t)511 ;
+ }
+
+ /* files from before the quota patch might i_blocks such that
+ ** bytes < real_space. Deal with that here to prevent it from
+ ** going negative.
+ */
+ if (bytes < real_space)
+ return 0 ;
+ return (bytes - real_space) >> 9;
+}
+
+//
+// BAD: new directories have stat data of new type and all other items
+// of old type. Version stored in the inode says about body items, so
+// in update_stat_data we can not rely on inode, but have to check
+// item version directly
+//
+
+// called by read_locked_inode
+static void init_inode (struct inode * inode, struct path * path)
+{
+ struct buffer_head * bh;
+ struct item_head * ih;
+ __u32 rdev;
+ //int version = ITEM_VERSION_1;
+
+ bh = PATH_PLAST_BUFFER (path);
+ ih = PATH_PITEM_HEAD (path);
+
+
+ copy_key (INODE_PKEY (inode), &(ih->ih_key));
+ inode->i_blksize = reiserfs_default_io_size;
+
+ INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list ));
+ REISERFS_I(inode)->i_flags = 0;
+ REISERFS_I(inode)->i_prealloc_block = 0;
+ REISERFS_I(inode)->i_prealloc_count = 0;
+ REISERFS_I(inode)->i_trans_id = 0;
+ REISERFS_I(inode)->i_jl = NULL;
+ REISERFS_I(inode)->i_acl_access = NULL;
+ REISERFS_I(inode)->i_acl_default = NULL;
+ init_rwsem (&REISERFS_I(inode)->xattr_sem);
+
+ if (stat_data_v1 (ih)) {
+ struct stat_data_v1 * sd = (struct stat_data_v1 *)B_I_PITEM (bh, ih);
+ unsigned long blocks;
+
+ set_inode_item_key_version (inode, KEY_FORMAT_3_5);
+ set_inode_sd_version (inode, STAT_DATA_V1);
+ inode->i_mode = sd_v1_mode(sd);
+ inode->i_nlink = sd_v1_nlink(sd);
+ inode->i_uid = sd_v1_uid(sd);
+ inode->i_gid = sd_v1_gid(sd);
+ inode->i_size = sd_v1_size(sd);
+ inode->i_atime.tv_sec = sd_v1_atime(sd);
+ inode->i_mtime.tv_sec = sd_v1_mtime(sd);
+ inode->i_ctime.tv_sec = sd_v1_ctime(sd);
+ inode->i_atime.tv_nsec = 0;
+ inode->i_ctime.tv_nsec = 0;
+ inode->i_mtime.tv_nsec = 0;
+
+ inode->i_blocks = sd_v1_blocks(sd);
+ inode->i_generation = le32_to_cpu (INODE_PKEY (inode)->k_dir_id);
+ blocks = (inode->i_size + 511) >> 9;
+ blocks = _ROUND_UP (blocks, inode->i_sb->s_blocksize >> 9);
+ if (inode->i_blocks > blocks) {
+ // there was a bug in <=3.5.23 when i_blocks could take negative
+ // values. Starting from 3.5.17 this value could even be stored in
+ // stat data. For such files we set i_blocks based on file
+ // size. Just 2 notes: this can be wrong for sparce files. On-disk value will be
+ // only updated if file's inode will ever change
+ inode->i_blocks = blocks;
+ }
+
+ rdev = sd_v1_rdev(sd);
+ REISERFS_I(inode)->i_first_direct_byte = sd_v1_first_direct_byte(sd);
+ /* an early bug in the quota code can give us an odd number for the
+ ** block count. This is incorrect, fix it here.
+ */
+ if (inode->i_blocks & 1) {
+ inode->i_blocks++ ;
+ }
+ inode_set_bytes(inode, to_real_used_space(inode, inode->i_blocks,
+ SD_V1_SIZE));
+ /* nopack is initially zero for v1 objects. For v2 objects,
+ nopack is initialised from sd_attrs */
+ REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
+ } else {
+ // new stat data found, but object may have old items
+ // (directories and symlinks)
+ struct stat_data * sd = (struct stat_data *)B_I_PITEM (bh, ih);
+
+ inode->i_mode = sd_v2_mode(sd);
+ inode->i_nlink = sd_v2_nlink(sd);
+ inode->i_uid = sd_v2_uid(sd);
+ inode->i_size = sd_v2_size(sd);
+ inode->i_gid = sd_v2_gid(sd);
+ inode->i_mtime.tv_sec = sd_v2_mtime(sd);
+ inode->i_atime.tv_sec = sd_v2_atime(sd);
+ inode->i_ctime.tv_sec = sd_v2_ctime(sd);
+ inode->i_ctime.tv_nsec = 0;
+ inode->i_mtime.tv_nsec = 0;
+ inode->i_atime.tv_nsec = 0;
+ inode->i_blocks = sd_v2_blocks(sd);
+ rdev = sd_v2_rdev(sd);
+ if( S_ISCHR( inode -> i_mode ) || S_ISBLK( inode -> i_mode ) )
+ inode->i_generation = le32_to_cpu (INODE_PKEY (inode)->k_dir_id);
+ else
+ inode->i_generation = sd_v2_generation(sd);
+
+ if (S_ISDIR (inode->i_mode) || S_ISLNK (inode->i_mode))
+ set_inode_item_key_version (inode, KEY_FORMAT_3_5);
+ else
+ set_inode_item_key_version (inode, KEY_FORMAT_3_6);
+ REISERFS_I(inode)->i_first_direct_byte = 0;
+ set_inode_sd_version (inode, STAT_DATA_V2);
+ inode_set_bytes(inode, to_real_used_space(inode, inode->i_blocks,
+ SD_V2_SIZE));
+ /* read persistent inode attributes from sd and initalise
+ generic inode flags from them */
+ REISERFS_I(inode)->i_attrs = sd_v2_attrs( sd );
+ sd_attrs_to_i_attrs( sd_v2_attrs( sd ), inode );
+ }
+
+ pathrelse (path);
+ if (S_ISREG (inode->i_mode)) {
+ inode->i_op = &reiserfs_file_inode_operations;
+ inode->i_fop = &reiserfs_file_operations;
+ inode->i_mapping->a_ops = &reiserfs_address_space_operations ;
+ } else if (S_ISDIR (inode->i_mode)) {
+ inode->i_op = &reiserfs_dir_inode_operations;
+ inode->i_fop = &reiserfs_dir_operations;
+ } else if (S_ISLNK (inode->i_mode)) {
+ inode->i_op = &reiserfs_symlink_inode_operations;
+ inode->i_mapping->a_ops = &reiserfs_address_space_operations;
+ } else {
+ inode->i_blocks = 0;
+ inode->i_op = &reiserfs_special_inode_operations;
+ init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
+ }
+}
+
+
+// update new stat data with inode fields
+static void inode2sd (void * sd, struct inode * inode, loff_t size)
+{
+ struct stat_data * sd_v2 = (struct stat_data *)sd;
+ __u16 flags;
+
+ set_sd_v2_mode(sd_v2, inode->i_mode );
+ set_sd_v2_nlink(sd_v2, inode->i_nlink );
+ set_sd_v2_uid(sd_v2, inode->i_uid );
+ set_sd_v2_size(sd_v2, size );
+ set_sd_v2_gid(sd_v2, inode->i_gid );
+ set_sd_v2_mtime(sd_v2, inode->i_mtime.tv_sec );
+ set_sd_v2_atime(sd_v2, inode->i_atime.tv_sec );
+ set_sd_v2_ctime(sd_v2, inode->i_ctime.tv_sec );
+ set_sd_v2_blocks(sd_v2, to_fake_used_blocks(inode, SD_V2_SIZE));
+ if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
+ set_sd_v2_rdev(sd_v2, new_encode_dev(inode->i_rdev));
+ else
+ set_sd_v2_generation(sd_v2, inode->i_generation);
+ flags = REISERFS_I(inode)->i_attrs;
+ i_attrs_to_sd_attrs( inode, &flags );
+ set_sd_v2_attrs( sd_v2, flags );
+}
+
+
+// used to copy inode's fields to old stat data
+static void inode2sd_v1 (void * sd, struct inode * inode, loff_t size)
+{
+ struct stat_data_v1 * sd_v1 = (struct stat_data_v1 *)sd;
+
+ set_sd_v1_mode(sd_v1, inode->i_mode );
+ set_sd_v1_uid(sd_v1, inode->i_uid );
+ set_sd_v1_gid(sd_v1, inode->i_gid );
+ set_sd_v1_nlink(sd_v1, inode->i_nlink );
+ set_sd_v1_size(sd_v1, size );
+ set_sd_v1_atime(sd_v1, inode->i_atime.tv_sec );
+ set_sd_v1_ctime(sd_v1, inode->i_ctime.tv_sec );
+ set_sd_v1_mtime(sd_v1, inode->i_mtime.tv_sec );
+
+ if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
+ set_sd_v1_rdev(sd_v1, new_encode_dev(inode->i_rdev));
+ else
+ set_sd_v1_blocks(sd_v1, to_fake_used_blocks(inode, SD_V1_SIZE));
+
+ // Sigh. i_first_direct_byte is back
+ set_sd_v1_first_direct_byte(sd_v1, REISERFS_I(inode)->i_first_direct_byte);
+}
+
+
+/* NOTE, you must prepare the buffer head before sending it here,
+** and then log it after the call
+*/
+static void update_stat_data (struct path * path, struct inode * inode,
+ loff_t size)
+{
+ struct buffer_head * bh;
+ struct item_head * ih;
+
+ bh = PATH_PLAST_BUFFER (path);
+ ih = PATH_PITEM_HEAD (path);
+
+ if (!is_statdata_le_ih (ih))
+ reiserfs_panic (inode->i_sb, "vs-13065: update_stat_data: key %k, found item %h",
+ INODE_PKEY (inode), ih);
+
+ if (stat_data_v1 (ih)) {
+ // path points to old stat data
+ inode2sd_v1 (B_I_PITEM (bh, ih), inode, size);
+ } else {
+ inode2sd (B_I_PITEM (bh, ih), inode, size);
+ }
+
+ return;
+}
+
+
+void reiserfs_update_sd_size (struct reiserfs_transaction_handle *th,
+ struct inode * inode, loff_t size)
+{
+ struct cpu_key key;
+ INITIALIZE_PATH(path);
+ struct buffer_head *bh ;
+ int fs_gen ;
+ struct item_head *ih, tmp_ih ;
+ int retval;
+
+ BUG_ON (!th->t_trans_id);
+
+ make_cpu_key (&key, inode, SD_OFFSET, TYPE_STAT_DATA, 3);//key type is unimportant
+
+ for(;;) {
+ int pos;
+ /* look for the object's stat data */
+ retval = search_item (inode->i_sb, &key, &path);
+ if (retval == IO_ERROR) {
+ reiserfs_warning (inode->i_sb, "vs-13050: reiserfs_update_sd: "
+ "i/o failure occurred trying to update %K stat data",
+ &key);
+ return;
+ }
+ if (retval == ITEM_NOT_FOUND) {
+ pos = PATH_LAST_POSITION (&path);
+ pathrelse(&path) ;
+ if (inode->i_nlink == 0) {
+ /*reiserfs_warning (inode->i_sb, "vs-13050: reiserfs_update_sd: i_nlink == 0, stat data not found");*/
+ return;
+ }
+ reiserfs_warning (inode->i_sb, "vs-13060: reiserfs_update_sd: "
+ "stat data of object %k (nlink == %d) not found (pos %d)",
+ INODE_PKEY (inode), inode->i_nlink, pos);
+ reiserfs_check_path(&path) ;
+ return;
+ }
+
+ /* sigh, prepare_for_journal might schedule. When it schedules the
+ ** FS might change. We have to detect that, and loop back to the
+ ** search if the stat data item has moved
+ */
+ bh = get_last_bh(&path) ;
+ ih = get_ih(&path) ;
+ copy_item_head (&tmp_ih, ih);
+ fs_gen = get_generation (inode->i_sb);
+ reiserfs_prepare_for_journal(inode->i_sb, bh, 1) ;
+ if (fs_changed (fs_gen, inode->i_sb) && item_moved(&tmp_ih, &path)) {
+ reiserfs_restore_prepared_buffer(inode->i_sb, bh) ;
+ continue ; /* Stat_data item has been moved after scheduling. */
+ }
+ break;
+ }
+ update_stat_data (&path, inode, size);
+ journal_mark_dirty(th, th->t_super, bh) ;
+ pathrelse (&path);
+ return;
+}
+
+/* reiserfs_read_locked_inode is called to read the inode off disk, and it
+** does a make_bad_inode when things go wrong. But, we need to make sure
+** and clear the key in the private portion of the inode, otherwise a
+** corresponding iput might try to delete whatever object the inode last
+** represented.
+*/
+static void reiserfs_make_bad_inode(struct inode *inode) {
+ memset(INODE_PKEY(inode), 0, KEY_SIZE);
+ make_bad_inode(inode);
+}
+
+//
+// initially this function was derived from minix or ext2's analog and
+// evolved as the prototype did
+//
+
+int reiserfs_init_locked_inode (struct inode * inode, void *p)
+{
+ struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p ;
+ inode->i_ino = args->objectid;
+ INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid);
+ return 0;
+}
+
+/* looks for stat data in the tree, and fills up the fields of in-core
+ inode stat data fields */
+void reiserfs_read_locked_inode (struct inode * inode, struct reiserfs_iget_args *args)
+{
+ INITIALIZE_PATH (path_to_sd);
+ struct cpu_key key;
+ unsigned long dirino;
+ int retval;
+
+ dirino = args->dirid ;
+
+ /* set version 1, version 2 could be used too, because stat data
+ key is the same in both versions */
+ key.version = KEY_FORMAT_3_5;
+ key.on_disk_key.k_dir_id = dirino;
+ key.on_disk_key.k_objectid = inode->i_ino;
+ key.on_disk_key.u.k_offset_v1.k_offset = SD_OFFSET;
+ key.on_disk_key.u.k_offset_v1.k_uniqueness = SD_UNIQUENESS;
+
+ /* look for the object's stat data */
+ retval = search_item (inode->i_sb, &key, &path_to_sd);
+ if (retval == IO_ERROR) {
+ reiserfs_warning (inode->i_sb, "vs-13070: reiserfs_read_locked_inode: "
+ "i/o failure occurred trying to find stat data of %K",
+ &key);
+ reiserfs_make_bad_inode(inode) ;
+ return;
+ }
+ if (retval != ITEM_FOUND) {
+ /* a stale NFS handle can trigger this without it being an error */
+ pathrelse (&path_to_sd);
+ reiserfs_make_bad_inode(inode) ;
+ inode->i_nlink = 0;
+ return;
+ }
+
+ init_inode (inode, &path_to_sd);
+
+ /* It is possible that knfsd is trying to access inode of a file
+ that is being removed from the disk by some other thread. As we
+ update sd on unlink all that is required is to check for nlink
+ here. This bug was first found by Sizif when debugging
+ SquidNG/Butterfly, forgotten, and found again after Philippe
+ Gramoulle <philippe.gramoulle@mmania.com> reproduced it.
+
+ More logical fix would require changes in fs/inode.c:iput() to
+ remove inode from hash-table _after_ fs cleaned disk stuff up and
+ in iget() to return NULL if I_FREEING inode is found in
+ hash-table. */
+ /* Currently there is one place where it's ok to meet inode with
+ nlink==0: processing of open-unlinked and half-truncated files
+ during mount (fs/reiserfs/super.c:finish_unfinished()). */
+ if( ( inode -> i_nlink == 0 ) &&
+ ! REISERFS_SB(inode -> i_sb) -> s_is_unlinked_ok ) {
+ reiserfs_warning (inode->i_sb,
+ "vs-13075: reiserfs_read_locked_inode: "
+ "dead inode read from disk %K. "
+ "This is likely to be race with knfsd. Ignore",
+ &key );
+ reiserfs_make_bad_inode( inode );
+ }
+
+ reiserfs_check_path(&path_to_sd) ; /* init inode should be relsing */
+
+}
+
+/**
+ * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked().
+ *
+ * @inode: inode from hash table to check
+ * @opaque: "cookie" passed to iget5_locked(). This is &reiserfs_iget_args.
+ *
+ * This function is called by iget5_locked() to distinguish reiserfs inodes
+ * having the same inode numbers. Such inodes can only exist due to some
+ * error condition. One of them should be bad. Inodes with identical
+ * inode numbers (objectids) are distinguished by parent directory ids.
+ *
+ */
+int reiserfs_find_actor( struct inode *inode, void *opaque )
+{
+ struct reiserfs_iget_args *args;
+
+ args = opaque;
+ /* args is already in CPU order */
+ return (inode->i_ino == args->objectid) &&
+ (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid);
+}
+
+struct inode * reiserfs_iget (struct super_block * s, const struct cpu_key * key)
+{
+ struct inode * inode;
+ struct reiserfs_iget_args args ;
+
+ args.objectid = key->on_disk_key.k_objectid ;
+ args.dirid = key->on_disk_key.k_dir_id ;
+ inode = iget5_locked (s, key->on_disk_key.k_objectid,
+ reiserfs_find_actor, reiserfs_init_locked_inode, (void *)(&args));
+ if (!inode)
+ return ERR_PTR(-ENOMEM) ;
+
+ if (inode->i_state & I_NEW) {
+ reiserfs_read_locked_inode(inode, &args);
+ unlock_new_inode(inode);
+ }
+
+ if (comp_short_keys (INODE_PKEY (inode), key) || is_bad_inode (inode)) {
+ /* either due to i/o error or a stale NFS handle */
+ iput (inode);
+ inode = NULL;
+ }
+ return inode;
+}
+
+struct dentry *reiserfs_get_dentry(struct super_block *sb, void *vobjp)
+{
+ __u32 *data = vobjp;
+ struct cpu_key key ;
+ struct dentry *result;
+ struct inode *inode;
+
+ key.on_disk_key.k_objectid = data[0] ;
+ key.on_disk_key.k_dir_id = data[1] ;
+ reiserfs_write_lock(sb);
+ inode = reiserfs_iget(sb, &key) ;
+ if (inode && !IS_ERR(inode) && data[2] != 0 &&
+ data[2] != inode->i_generation) {
+ iput(inode) ;
+ inode = NULL ;
+ }
+ reiserfs_write_unlock(sb);
+ if (!inode)
+ inode = ERR_PTR(-ESTALE);
+ if (IS_ERR(inode))
+ return ERR_PTR(PTR_ERR(inode));
+ result = d_alloc_anon(inode);
+ if (!result) {
+ iput(inode);
+ return ERR_PTR(-ENOMEM);
+ }
+ return result;
+}
+
+struct dentry *reiserfs_decode_fh(struct super_block *sb, __u32 *data,
+ int len, int fhtype,
+ int (*acceptable)(void *contect, struct dentry *de),
+ void *context) {
+ __u32 obj[3], parent[3];
+
+ /* fhtype happens to reflect the number of u32s encoded.
+ * due to a bug in earlier code, fhtype might indicate there
+ * are more u32s then actually fitted.
+ * so if fhtype seems to be more than len, reduce fhtype.
+ * Valid types are:
+ * 2 - objectid + dir_id - legacy support
+ * 3 - objectid + dir_id + generation
+ * 4 - objectid + dir_id + objectid and dirid of parent - legacy
+ * 5 - objectid + dir_id + generation + objectid and dirid of parent
+ * 6 - as above plus generation of directory
+ * 6 does not fit in NFSv2 handles
+ */
+ if (fhtype > len) {
+ if (fhtype != 6 || len != 5)
+ reiserfs_warning (sb, "nfsd/reiserfs, fhtype=%d, len=%d - odd",
+ fhtype, len);
+ fhtype = 5;
+ }
+
+ obj[0] = data[0];
+ obj[1] = data[1];
+ if (fhtype == 3 || fhtype >= 5)
+ obj[2] = data[2];
+ else obj[2] = 0; /* generation number */
+
+ if (fhtype >= 4) {
+ parent[0] = data[fhtype>=5?3:2] ;
+ parent[1] = data[fhtype>=5?4:3] ;
+ if (fhtype == 6)
+ parent[2] = data[5];
+ else parent[2] = 0;
+ }
+ return sb->s_export_op->find_exported_dentry(sb, obj, fhtype < 4 ? NULL : parent,
+ acceptable, context);
+}
+
+int reiserfs_encode_fh(struct dentry *dentry, __u32 *data, int *lenp, int need_parent) {
+ struct inode *inode = dentry->d_inode ;
+ int maxlen = *lenp;
+
+ if (maxlen < 3)
+ return 255 ;
+
+ data[0] = inode->i_ino ;
+ data[1] = le32_to_cpu(INODE_PKEY (inode)->k_dir_id) ;
+ data[2] = inode->i_generation ;
+ *lenp = 3 ;
+ /* no room for directory info? return what we've stored so far */
+ if (maxlen < 5 || ! need_parent)
+ return 3 ;
+
+ spin_lock(&dentry->d_lock);
+ inode = dentry->d_parent->d_inode ;
+ data[3] = inode->i_ino ;
+ data[4] = le32_to_cpu(INODE_PKEY (inode)->k_dir_id) ;
+ *lenp = 5 ;
+ if (maxlen >= 6) {
+ data[5] = inode->i_generation ;
+ *lenp = 6 ;
+ }
+ spin_unlock(&dentry->d_lock);
+ return *lenp ;
+}
+
+
+/* looks for stat data, then copies fields to it, marks the buffer
+ containing stat data as dirty */
+/* reiserfs inodes are never really dirty, since the dirty inode call
+** always logs them. This call allows the VFS inode marking routines
+** to properly mark inodes for datasync and such, but only actually
+** does something when called for a synchronous update.
+*/
+int reiserfs_write_inode (struct inode * inode, int do_sync) {
+ struct reiserfs_transaction_handle th ;
+ int jbegin_count = 1 ;
+
+ if (inode->i_sb->s_flags & MS_RDONLY)
+ return -EROFS;
+ /* memory pressure can sometimes initiate write_inode calls with sync == 1,
+ ** these cases are just when the system needs ram, not when the
+ ** inode needs to reach disk for safety, and they can safely be
+ ** ignored because the altered inode has already been logged.
+ */
+ if (do_sync && !(current->flags & PF_MEMALLOC)) {
+ reiserfs_write_lock(inode->i_sb);
+ if (!journal_begin(&th, inode->i_sb, jbegin_count)) {
+ reiserfs_update_sd (&th, inode);
+ journal_end_sync(&th, inode->i_sb, jbegin_count) ;
+ }
+ reiserfs_write_unlock(inode->i_sb);
+ }
+ return 0;
+}
+
+/* stat data of new object is inserted already, this inserts the item
+ containing "." and ".." entries */
+static int reiserfs_new_directory (struct reiserfs_transaction_handle *th,
+ struct inode *inode,
+ struct item_head * ih, struct path * path,
+ struct inode * dir)
+{
+ struct super_block * sb = th->t_super;
+ char empty_dir [EMPTY_DIR_SIZE];
+ char * body = empty_dir;
+ struct cpu_key key;
+ int retval;
+
+ BUG_ON (!th->t_trans_id);
+
+ _make_cpu_key (&key, KEY_FORMAT_3_5, le32_to_cpu (ih->ih_key.k_dir_id),
+ le32_to_cpu (ih->ih_key.k_objectid), DOT_OFFSET, TYPE_DIRENTRY, 3/*key length*/);
+
+ /* compose item head for new item. Directories consist of items of
+ old type (ITEM_VERSION_1). Do not set key (second arg is 0), it
+ is done by reiserfs_new_inode */
+ if (old_format_only (sb)) {
+ make_le_item_head (ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET, TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2);
+
+ make_empty_dir_item_v1 (body, ih->ih_key.k_dir_id, ih->ih_key.k_objectid,
+ INODE_PKEY (dir)->k_dir_id,
+ INODE_PKEY (dir)->k_objectid );
+ } else {
+ make_le_item_head (ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET, TYPE_DIRENTRY, EMPTY_DIR_SIZE, 2);
+
+ make_empty_dir_item (body, ih->ih_key.k_dir_id, ih->ih_key.k_objectid,
+ INODE_PKEY (dir)->k_dir_id,
+ INODE_PKEY (dir)->k_objectid );
+ }
+
+ /* look for place in the tree for new item */
+ retval = search_item (sb, &key, path);
+ if (retval == IO_ERROR) {
+ reiserfs_warning (sb, "vs-13080: reiserfs_new_directory: "
+ "i/o failure occurred creating new directory");
+ return -EIO;
+ }
+ if (retval == ITEM_FOUND) {
+ pathrelse (path);
+ reiserfs_warning (sb, "vs-13070: reiserfs_new_directory: "
+ "object with this key exists (%k)", &(ih->ih_key));
+ return -EEXIST;
+ }
+
+ /* insert item, that is empty directory item */
+ return reiserfs_insert_item (th, path, &key, ih, inode, body);
+}
+
+
+/* stat data of object has been inserted, this inserts the item
+ containing the body of symlink */
+static int reiserfs_new_symlink (struct reiserfs_transaction_handle *th,
+ struct inode *inode, /* Inode of symlink */
+ struct item_head * ih,
+ struct path * path, const char * symname, int item_len)
+{
+ struct super_block * sb = th->t_super;
+ struct cpu_key key;
+ int retval;
+
+ BUG_ON (!th->t_trans_id);
+
+ _make_cpu_key (&key, KEY_FORMAT_3_5,
+ le32_to_cpu (ih->ih_key.k_dir_id),
+ le32_to_cpu (ih->ih_key.k_objectid),
+ 1, TYPE_DIRECT, 3/*key length*/);
+
+ make_le_item_head (ih, NULL, KEY_FORMAT_3_5, 1, TYPE_DIRECT, item_len, 0/*free_space*/);
+
+ /* look for place in the tree for new item */
+ retval = search_item (sb, &key, path);
+ if (retval == IO_ERROR) {
+ reiserfs_warning (sb, "vs-13080: reiserfs_new_symlinik: "
+ "i/o failure occurred creating new symlink");
+ return -EIO;
+ }
+ if (retval == ITEM_FOUND) {
+ pathrelse (path);
+ reiserfs_warning (sb, "vs-13080: reiserfs_new_symlink: "
+ "object with this key exists (%k)", &(ih->ih_key));
+ return -EEXIST;
+ }
+
+ /* insert item, that is body of symlink */
+ return reiserfs_insert_item (th, path, &key, ih, inode, symname);
+}
+
+
+/* inserts the stat data into the tree, and then calls
+ reiserfs_new_directory (to insert ".", ".." item if new object is
+ directory) or reiserfs_new_symlink (to insert symlink body if new
+ object is symlink) or nothing (if new object is regular file)
+
+ NOTE! uid and gid must already be set in the inode. If we return
+ non-zero due to an error, we have to drop the quota previously allocated
+ for the fresh inode. This can only be done outside a transaction, so
+ if we return non-zero, we also end the transaction. */
+int reiserfs_new_inode (struct reiserfs_transaction_handle *th,
+ struct inode * dir, int mode,
+ const char * symname,
+ /* 0 for regular, EMTRY_DIR_SIZE for dirs,
+ strlen (symname) for symlinks)*/
+ loff_t i_size, struct dentry *dentry,
+ struct inode *inode)
+{
+ struct super_block * sb;
+ INITIALIZE_PATH (path_to_key);
+ struct cpu_key key;
+ struct item_head ih;
+ struct stat_data sd;
+ int retval;
+ int err;
+
+ BUG_ON (!th->t_trans_id);
+
+ if (DQUOT_ALLOC_INODE(inode)) {
+ err = -EDQUOT;
+ goto out_end_trans;
+ }
+ if (!dir || !dir->i_nlink) {
+ err = -EPERM;
+ goto out_bad_inode;
+ }
+
+ sb = dir->i_sb;
+
+ /* item head of new item */
+ ih.ih_key.k_dir_id = reiserfs_choose_packing(dir);
+ ih.ih_key.k_objectid = cpu_to_le32 (reiserfs_get_unused_objectid (th));
+ if (!ih.ih_key.k_objectid) {
+ err = -ENOMEM;
+ goto out_bad_inode ;
+ }
+ if (old_format_only (sb))
+ /* not a perfect generation count, as object ids can be reused, but
+ ** this is as good as reiserfs can do right now.
+ ** note that the private part of inode isn't filled in yet, we have
+ ** to use the directory.
+ */
+ inode->i_generation = le32_to_cpu (INODE_PKEY (dir)->k_objectid);
+ else
+#if defined( USE_INODE_GENERATION_COUNTER )
+ inode->i_generation = le32_to_cpu(REISERFS_SB(sb)->s_rs->s_inode_generation);
+#else
+ inode->i_generation = ++event;
+#endif
+
+ /* fill stat data */
+ inode->i_nlink = (S_ISDIR (mode) ? 2 : 1);
+
+ /* uid and gid must already be set by the caller for quota init */
+
+ /* symlink cannot be immutable or append only, right? */
+ if( S_ISLNK( inode -> i_mode ) )
+ inode -> i_flags &= ~ ( S_IMMUTABLE | S_APPEND );
+
+ inode->i_mtime = inode->i_atime = inode->i_ctime =
+ CURRENT_TIME_SEC;
+ inode->i_size = i_size;
+ inode->i_blocks = 0;
+ inode->i_bytes = 0;
+ REISERFS_I(inode)->i_first_direct_byte = S_ISLNK(mode) ? 1 :
+ U32_MAX/*NO_BYTES_IN_DIRECT_ITEM*/;
+
+ INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list ));
+ REISERFS_I(inode)->i_flags = 0;
+ REISERFS_I(inode)->i_prealloc_block = 0;
+ REISERFS_I(inode)->i_prealloc_count = 0;
+ REISERFS_I(inode)->i_trans_id = 0;
+ REISERFS_I(inode)->i_jl = NULL;
+ REISERFS_I(inode)->i_attrs =
+ REISERFS_I(dir)->i_attrs & REISERFS_INHERIT_MASK;
+ sd_attrs_to_i_attrs( REISERFS_I(inode) -> i_attrs, inode );
+ REISERFS_I(inode)->i_acl_access = NULL;
+ REISERFS_I(inode)->i_acl_default = NULL;
+ init_rwsem (&REISERFS_I(inode)->xattr_sem);
+
+ if (old_format_only (sb))
+ make_le_item_head (&ih, NULL, KEY_FORMAT_3_5, SD_OFFSET, TYPE_STAT_DATA, SD_V1_SIZE, MAX_US_INT);
+ else
+ make_le_item_head (&ih, NULL, KEY_FORMAT_3_6, SD_OFFSET, TYPE_STAT_DATA, SD_SIZE, MAX_US_INT);
+
+ /* key to search for correct place for new stat data */
+ _make_cpu_key (&key, KEY_FORMAT_3_6, le32_to_cpu (ih.ih_key.k_dir_id),
+ le32_to_cpu (ih.ih_key.k_objectid), SD_OFFSET, TYPE_STAT_DATA, 3/*key length*/);
+
+ /* find proper place for inserting of stat data */
+ retval = search_item (sb, &key, &path_to_key);
+ if (retval == IO_ERROR) {
+ err = -EIO;
+ goto out_bad_inode;
+ }
+ if (retval == ITEM_FOUND) {
+ pathrelse (&path_to_key);
+ err = -EEXIST;
+ goto out_bad_inode;
+ }
+ if (old_format_only (sb)) {
+ if (inode->i_uid & ~0xffff || inode->i_gid & ~0xffff) {
+ pathrelse (&path_to_key);
+ /* i_uid or i_gid is too big to be stored in stat data v3.5 */
+ err = -EINVAL;
+ goto out_bad_inode;
+ }
+ inode2sd_v1 (&sd, inode, inode->i_size);
+ } else {
+ inode2sd (&sd, inode, inode->i_size);
+ }
+ // these do not go to on-disk stat data
+ inode->i_ino = le32_to_cpu (ih.ih_key.k_objectid);
+ inode->i_blksize = reiserfs_default_io_size;
+
+ // store in in-core inode the key of stat data and version all
+ // object items will have (directory items will have old offset
+ // format, other new objects will consist of new items)
+ memcpy (INODE_PKEY (inode), &(ih.ih_key), KEY_SIZE);
+ if (old_format_only (sb) || S_ISDIR(mode) || S_ISLNK(mode))
+ set_inode_item_key_version (inode, KEY_FORMAT_3_5);
+ else
+ set_inode_item_key_version (inode, KEY_FORMAT_3_6);
+ if (old_format_only (sb))
+ set_inode_sd_version (inode, STAT_DATA_V1);
+ else
+ set_inode_sd_version (inode, STAT_DATA_V2);
+
+ /* insert the stat data into the tree */
+#ifdef DISPLACE_NEW_PACKING_LOCALITIES
+ if (REISERFS_I(dir)->new_packing_locality)
+ th->displace_new_blocks = 1;
+#endif
+ retval = reiserfs_insert_item (th, &path_to_key, &key, &ih, inode, (char *)(&sd));
+ if (retval) {
+ err = retval;
+ reiserfs_check_path(&path_to_key) ;
+ goto out_bad_inode;
+ }
+
+#ifdef DISPLACE_NEW_PACKING_LOCALITIES
+ if (!th->displace_new_blocks)
+ REISERFS_I(dir)->new_packing_locality = 0;
+#endif
+ if (S_ISDIR(mode)) {
+ /* insert item with "." and ".." */
+ retval = reiserfs_new_directory (th, inode, &ih, &path_to_key, dir);
+ }
+
+ if (S_ISLNK(mode)) {
+ /* insert body of symlink */
+ if (!old_format_only (sb))
+ i_size = ROUND_UP(i_size);
+ retval = reiserfs_new_symlink (th, inode, &ih, &path_to_key, symname, i_size);
+ }
+ if (retval) {
+ err = retval;
+ reiserfs_check_path(&path_to_key) ;
+ journal_end(th, th->t_super, th->t_blocks_allocated);
+ goto out_inserted_sd;
+ }
+
+ /* XXX CHECK THIS */
+ if (reiserfs_posixacl (inode->i_sb)) {
+ retval = reiserfs_inherit_default_acl (dir, dentry, inode);
+ if (retval) {
+ err = retval;
+ reiserfs_check_path(&path_to_key) ;
+ journal_end(th, th->t_super, th->t_blocks_allocated);
+ goto out_inserted_sd;
+ }
+ } else if (inode->i_sb->s_flags & MS_POSIXACL) {
+ reiserfs_warning (inode->i_sb, "ACLs aren't enabled in the fs, "
+ "but vfs thinks they are!");
+ } else if (is_reiserfs_priv_object (dir)) {
+ reiserfs_mark_inode_private (inode);
+ }
+
+ insert_inode_hash (inode);
+ reiserfs_update_sd(th, inode);
+ reiserfs_check_path(&path_to_key) ;
+
+ return 0;
+
+/* it looks like you can easily compress these two goto targets into
+ * one. Keeping it like this doesn't actually hurt anything, and they
+ * are place holders for what the quota code actually needs.
+ */
+out_bad_inode:
+ /* Invalidate the object, nothing was inserted yet */
+ INODE_PKEY(inode)->k_objectid = 0;
+
+ /* Quota change must be inside a transaction for journaling */
+ DQUOT_FREE_INODE(inode);
+
+out_end_trans:
+ journal_end(th, th->t_super, th->t_blocks_allocated) ;
+ /* Drop can be outside and it needs more credits so it's better to have it outside */
+ DQUOT_DROP(inode);
+ inode->i_flags |= S_NOQUOTA;
+ make_bad_inode(inode);
+
+out_inserted_sd:
+ inode->i_nlink = 0;
+ th->t_trans_id = 0; /* so the caller can't use this handle later */
+ iput(inode);
+ return err;
+}
+
+/*
+** finds the tail page in the page cache,
+** reads the last block in.
+**
+** On success, page_result is set to a locked, pinned page, and bh_result
+** is set to an up to date buffer for the last block in the file. returns 0.
+**
+** tail conversion is not done, so bh_result might not be valid for writing
+** check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before
+** trying to write the block.
+**
+** on failure, nonzero is returned, page_result and bh_result are untouched.
+*/
+static int grab_tail_page(struct inode *p_s_inode,
+ struct page **page_result,
+ struct buffer_head **bh_result) {
+
+ /* we want the page with the last byte in the file,
+ ** not the page that will hold the next byte for appending
+ */
+ unsigned long index = (p_s_inode->i_size-1) >> PAGE_CACHE_SHIFT ;
+ unsigned long pos = 0 ;
+ unsigned long start = 0 ;
+ unsigned long blocksize = p_s_inode->i_sb->s_blocksize ;
+ unsigned long offset = (p_s_inode->i_size) & (PAGE_CACHE_SIZE - 1) ;
+ struct buffer_head *bh ;
+ struct buffer_head *head ;
+ struct page * page ;
+ int error ;
+
+ /* we know that we are only called with inode->i_size > 0.
+ ** we also know that a file tail can never be as big as a block
+ ** If i_size % blocksize == 0, our file is currently block aligned
+ ** and it won't need converting or zeroing after a truncate.
+ */
+ if ((offset & (blocksize - 1)) == 0) {
+ return -ENOENT ;
+ }
+ page = grab_cache_page(p_s_inode->i_mapping, index) ;
+ error = -ENOMEM ;
+ if (!page) {
+ goto out ;
+ }
+ /* start within the page of the last block in the file */
+ start = (offset / blocksize) * blocksize ;
+
+ error = block_prepare_write(page, start, offset,
+ reiserfs_get_block_create_0) ;
+ if (error)
+ goto unlock ;
+
+ head = page_buffers(page) ;
+ bh = head;
+ do {
+ if (pos >= start) {
+ break ;
+ }
+ bh = bh->b_this_page ;
+ pos += blocksize ;
+ } while(bh != head) ;
+
+ if (!buffer_uptodate(bh)) {
+ /* note, this should never happen, prepare_write should
+ ** be taking care of this for us. If the buffer isn't up to date,
+ ** I've screwed up the code to find the buffer, or the code to
+ ** call prepare_write
+ */
+ reiserfs_warning (p_s_inode->i_sb,
+ "clm-6000: error reading block %lu on dev %s",
+ bh->b_blocknr,
+ reiserfs_bdevname (p_s_inode->i_sb)) ;
+ error = -EIO ;
+ goto unlock ;
+ }
+ *bh_result = bh ;
+ *page_result = page ;
+
+out:
+ return error ;
+
+unlock:
+ unlock_page(page) ;
+ page_cache_release(page) ;
+ return error ;
+}
+
+/*
+** vfs version of truncate file. Must NOT be called with
+** a transaction already started.
+**
+** some code taken from block_truncate_page
+*/
+int reiserfs_truncate_file(struct inode *p_s_inode, int update_timestamps) {
+ struct reiserfs_transaction_handle th ;
+ /* we want the offset for the first byte after the end of the file */
+ unsigned long offset = p_s_inode->i_size & (PAGE_CACHE_SIZE - 1) ;
+ unsigned blocksize = p_s_inode->i_sb->s_blocksize ;
+ unsigned length ;
+ struct page *page = NULL ;
+ int error ;
+ struct buffer_head *bh = NULL ;
+
+ reiserfs_write_lock(p_s_inode->i_sb);
+
+ if (p_s_inode->i_size > 0) {
+ if ((error = grab_tail_page(p_s_inode, &page, &bh))) {
+ // -ENOENT means we truncated past the end of the file,
+ // and get_block_create_0 could not find a block to read in,
+ // which is ok.
+ if (error != -ENOENT)
+ reiserfs_warning (p_s_inode->i_sb,
+ "clm-6001: grab_tail_page failed %d",
+ error);
+ page = NULL ;
+ bh = NULL ;
+ }
+ }
+
+ /* so, if page != NULL, we have a buffer head for the offset at
+ ** the end of the file. if the bh is mapped, and bh->b_blocknr != 0,
+ ** then we have an unformatted node. Otherwise, we have a direct item,
+ ** and no zeroing is required on disk. We zero after the truncate,
+ ** because the truncate might pack the item anyway
+ ** (it will unmap bh if it packs).
+ */
+ /* it is enough to reserve space in transaction for 2 balancings:
+ one for "save" link adding and another for the first
+ cut_from_item. 1 is for update_sd */
+ error = journal_begin (&th, p_s_inode->i_sb,
+ JOURNAL_PER_BALANCE_CNT * 2 + 1);
+ if (error)
+ goto out;
+ reiserfs_update_inode_transaction(p_s_inode) ;
+ if (update_timestamps)
+ /* we are doing real truncate: if the system crashes before the last
+ transaction of truncating gets committed - on reboot the file
+ either appears truncated properly or not truncated at all */
+ add_save_link (&th, p_s_inode, 1);
+ error = reiserfs_do_truncate (&th, p_s_inode, page, update_timestamps) ;
+ if (error)
+ goto out;
+ error = journal_end (&th, p_s_inode->i_sb, JOURNAL_PER_BALANCE_CNT * 2 + 1);
+ if (error)
+ goto out;
+
+ if (update_timestamps) {
+ error = remove_save_link (p_s_inode, 1/* truncate */);
+ if (error)
+ goto out;
+ }
+
+ if (page) {
+ length = offset & (blocksize - 1) ;
+ /* if we are not on a block boundary */
+ if (length) {
+ char *kaddr;
+
+ length = blocksize - length ;
+ kaddr = kmap_atomic(page, KM_USER0) ;
+ memset(kaddr + offset, 0, length) ;
+ flush_dcache_page(page) ;
+ kunmap_atomic(kaddr, KM_USER0) ;
+ if (buffer_mapped(bh) && bh->b_blocknr != 0) {
+ mark_buffer_dirty(bh) ;
+ }
+ }
+ unlock_page(page) ;
+ page_cache_release(page) ;
+ }
+
+ reiserfs_write_unlock(p_s_inode->i_sb);
+ return 0;
+out:
+ if (page) {
+ unlock_page (page);
+ page_cache_release (page);
+ }
+ reiserfs_write_unlock(p_s_inode->i_sb);
+ return error;
+}
+
+static int map_block_for_writepage(struct inode *inode,
+ struct buffer_head *bh_result,
+ unsigned long block) {
+ struct reiserfs_transaction_handle th ;
+ int fs_gen ;
+ struct item_head tmp_ih ;
+ struct item_head *ih ;
+ struct buffer_head *bh ;
+ __u32 *item ;
+ struct cpu_key key ;
+ INITIALIZE_PATH(path) ;
+ int pos_in_item ;
+ int jbegin_count = JOURNAL_PER_BALANCE_CNT ;
+ loff_t byte_offset = (block << inode->i_sb->s_blocksize_bits) + 1 ;
+ int retval ;
+ int use_get_block = 0 ;
+ int bytes_copied = 0 ;
+ int copy_size ;
+ int trans_running = 0;
+
+ /* catch places below that try to log something without starting a trans */
+ th.t_trans_id = 0;
+
+ if (!buffer_uptodate(bh_result)) {
+ return -EIO;
+ }
+
+ kmap(bh_result->b_page) ;
+start_over:
+ reiserfs_write_lock(inode->i_sb);
+ make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3) ;
+
+research:
+ retval = search_for_position_by_key(inode->i_sb, &key, &path) ;
+ if (retval != POSITION_FOUND) {
+ use_get_block = 1;
+ goto out ;
+ }
+
+ bh = get_last_bh(&path) ;
+ ih = get_ih(&path) ;
+ item = get_item(&path) ;
+ pos_in_item = path.pos_in_item ;
+
+ /* we've found an unformatted node */
+ if (indirect_item_found(retval, ih)) {
+ if (bytes_copied > 0) {
+ reiserfs_warning (inode->i_sb, "clm-6002: bytes_copied %d",
+ bytes_copied) ;
+ }
+ if (!get_block_num(item, pos_in_item)) {
+ /* crap, we are writing to a hole */
+ use_get_block = 1;
+ goto out ;
+ }
+ set_block_dev_mapped(bh_result, get_block_num(item,pos_in_item),inode);
+ } else if (is_direct_le_ih(ih)) {
+ char *p ;
+ p = page_address(bh_result->b_page) ;
+ p += (byte_offset -1) & (PAGE_CACHE_SIZE - 1) ;
+ copy_size = ih_item_len(ih) - pos_in_item;
+
+ fs_gen = get_generation(inode->i_sb) ;
+ copy_item_head(&tmp_ih, ih) ;
+
+ if (!trans_running) {
+ /* vs-3050 is gone, no need to drop the path */
+ retval = journal_begin(&th, inode->i_sb, jbegin_count) ;
+ if (retval)
+ goto out;
+ reiserfs_update_inode_transaction(inode) ;
+ trans_running = 1;
+ if (fs_changed(fs_gen, inode->i_sb) && item_moved(&tmp_ih, &path)) {
+ reiserfs_restore_prepared_buffer(inode->i_sb, bh) ;
+ goto research;
+ }
+ }
+
+ reiserfs_prepare_for_journal(inode->i_sb, bh, 1) ;
+
+ if (fs_changed (fs_gen, inode->i_sb) && item_moved (&tmp_ih, &path)) {
+ reiserfs_restore_prepared_buffer(inode->i_sb, bh) ;
+ goto research;
+ }
+
+ memcpy( B_I_PITEM(bh, ih) + pos_in_item, p + bytes_copied, copy_size) ;
+
+ journal_mark_dirty(&th, inode->i_sb, bh) ;
+ bytes_copied += copy_size ;
+ set_block_dev_mapped(bh_result, 0, inode);
+
+ /* are there still bytes left? */
+ if (bytes_copied < bh_result->b_size &&
+ (byte_offset + bytes_copied) < inode->i_size) {
+ set_cpu_key_k_offset(&key, cpu_key_k_offset(&key) + copy_size) ;
+ goto research ;
+ }
+ } else {
+ reiserfs_warning (inode->i_sb,
+ "clm-6003: bad item inode %lu, device %s",
+ inode->i_ino, reiserfs_bdevname (inode->i_sb)) ;
+ retval = -EIO ;
+ goto out ;
+ }
+ retval = 0 ;
+
+out:
+ pathrelse(&path) ;
+ if (trans_running) {
+ int err = journal_end(&th, inode->i_sb, jbegin_count) ;
+ if (err)
+ retval = err;
+ trans_running = 0;
+ }
+ reiserfs_write_unlock(inode->i_sb);
+
+ /* this is where we fill in holes in the file. */
+ if (use_get_block) {
+ retval = reiserfs_get_block(inode, block, bh_result,
+ GET_BLOCK_CREATE | GET_BLOCK_NO_ISEM |
+ GET_BLOCK_NO_DANGLE);
+ if (!retval) {
+ if (!buffer_mapped(bh_result) || bh_result->b_blocknr == 0) {
+ /* get_block failed to find a mapped unformatted node. */
+ use_get_block = 0 ;
+ goto start_over ;
+ }
+ }
+ }
+ kunmap(bh_result->b_page) ;
+
+ if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
+ /* we've copied data from the page into the direct item, so the
+ * buffer in the page is now clean, mark it to reflect that.
+ */
+ lock_buffer(bh_result);
+ clear_buffer_dirty(bh_result);
+ unlock_buffer(bh_result);
+ }
+ return retval ;
+}
+
+/*
+ * mason@suse.com: updated in 2.5.54 to follow the same general io
+ * start/recovery path as __block_write_full_page, along with special
+ * code to handle reiserfs tails.
+ */
+static int reiserfs_write_full_page(struct page *page, struct writeback_control *wbc) {
+ struct inode *inode = page->mapping->host ;
+ unsigned long end_index = inode->i_size >> PAGE_CACHE_SHIFT ;
+ int error = 0;
+ unsigned long block ;
+ struct buffer_head *head, *bh;
+ int partial = 0 ;
+ int nr = 0;
+ int checked = PageChecked(page);
+ struct reiserfs_transaction_handle th;
+ struct super_block *s = inode->i_sb;
+ int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize;
+ th.t_trans_id = 0;
+
+ /* The page dirty bit is cleared before writepage is called, which
+ * means we have to tell create_empty_buffers to make dirty buffers
+ * The page really should be up to date at this point, so tossing
+ * in the BH_Uptodate is just a sanity check.
+ */
+ if (!page_has_buffers(page)) {
+ create_empty_buffers(page, s->s_blocksize,
+ (1 << BH_Dirty) | (1 << BH_Uptodate));
+ }
+ head = page_buffers(page) ;
+
+ /* last page in the file, zero out any contents past the
+ ** last byte in the file
+ */
+ if (page->index >= end_index) {
+ char *kaddr;
+ unsigned last_offset;
+
+ last_offset = inode->i_size & (PAGE_CACHE_SIZE - 1) ;
+ /* no file contents in this page */
+ if (page->index >= end_index + 1 || !last_offset) {
+ unlock_page(page);
+ return 0;
+ }
+ kaddr = kmap_atomic(page, KM_USER0);
+ memset(kaddr + last_offset, 0, PAGE_CACHE_SIZE-last_offset) ;
+ flush_dcache_page(page) ;
+ kunmap_atomic(kaddr, KM_USER0) ;
+ }
+ bh = head ;
+ block = page->index << (PAGE_CACHE_SHIFT - s->s_blocksize_bits) ;
+ /* first map all the buffers, logging any direct items we find */
+ do {
+ if ((checked || buffer_dirty(bh)) && (!buffer_mapped(bh) ||
+ (buffer_mapped(bh) && bh->b_blocknr == 0))) {
+ /* not mapped yet, or it points to a direct item, search
+ * the btree for the mapping info, and log any direct
+ * items found
+ */
+ if ((error = map_block_for_writepage(inode, bh, block))) {
+ goto fail ;
+ }
+ }
+ bh = bh->b_this_page;
+ block++;
+ } while(bh != head) ;
+
+ /*
+ * we start the transaction after map_block_for_writepage,
+ * because it can create holes in the file (an unbounded operation).
+ * starting it here, we can make a reliable estimate for how many
+ * blocks we're going to log
+ */
+ if (checked) {
+ ClearPageChecked(page);
+ reiserfs_write_lock(s);
+ error = journal_begin(&th, s, bh_per_page + 1);
+ if (error) {
+ reiserfs_write_unlock(s);
+ goto fail;
+ }
+ reiserfs_update_inode_transaction(inode);
+ }
+ /* now go through and lock any dirty buffers on the page */
+ do {
+ get_bh(bh);
+ if (!buffer_mapped(bh))
+ continue;
+ if (buffer_mapped(bh) && bh->b_blocknr == 0)
+ continue;
+
+ if (checked) {
+ reiserfs_prepare_for_journal(s, bh, 1);
+ journal_mark_dirty(&th, s, bh);
+ continue;
+ }
+ /* from this point on, we know the buffer is mapped to a
+ * real block and not a direct item
+ */
+ if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) {
+ lock_buffer(bh);
+ } else {
+ if (test_set_buffer_locked(bh)) {
+ redirty_page_for_writepage(wbc, page);
+ continue;
+ }
+ }
+ if (test_clear_buffer_dirty(bh)) {
+ mark_buffer_async_write(bh);
+ } else {
+ unlock_buffer(bh);
+ }
+ } while((bh = bh->b_this_page) != head);
+
+ if (checked) {
+ error = journal_end(&th, s, bh_per_page + 1);
+ reiserfs_write_unlock(s);
+ if (error)
+ goto fail;
+ }
+ BUG_ON(PageWriteback(page));
+ set_page_writeback(page);
+ unlock_page(page);
+
+ /*
+ * since any buffer might be the only dirty buffer on the page,
+ * the first submit_bh can bring the page out of writeback.
+ * be careful with the buffers.
+ */
+ do {
+ struct buffer_head *next = bh->b_this_page;
+ if (buffer_async_write(bh)) {
+ submit_bh(WRITE, bh);
+ nr++;
+ }
+ put_bh(bh);
+ bh = next;
+ } while(bh != head);
+
+ error = 0;
+done:
+ if (nr == 0) {
+ /*
+ * if this page only had a direct item, it is very possible for
+ * no io to be required without there being an error. Or,
+ * someone else could have locked them and sent them down the
+ * pipe without locking the page
+ */
+ bh = head ;
+ do {
+ if (!buffer_uptodate(bh)) {
+ partial = 1;
+ break;
+ }
+ bh = bh->b_this_page;
+ } while(bh != head);
+ if (!partial)
+ SetPageUptodate(page);
+ end_page_writeback(page);
+ }
+ return error;
+
+fail:
+ /* catches various errors, we need to make sure any valid dirty blocks
+ * get to the media. The page is currently locked and not marked for
+ * writeback
+ */
+ ClearPageUptodate(page);
+ bh = head;
+ do {
+ get_bh(bh);
+ if (buffer_mapped(bh) && buffer_dirty(bh) && bh->b_blocknr) {
+ lock_buffer(bh);
+ mark_buffer_async_write(bh);
+ } else {
+ /*
+ * clear any dirty bits that might have come from getting
+ * attached to a dirty page
+ */
+ clear_buffer_dirty(bh);
+ }
+ bh = bh->b_this_page;
+ } while(bh != head);
+ SetPageError(page);
+ BUG_ON(PageWriteback(page));
+ set_page_writeback(page);
+ unlock_page(page);
+ do {
+ struct buffer_head *next = bh->b_this_page;
+ if (buffer_async_write(bh)) {
+ clear_buffer_dirty(bh);
+ submit_bh(WRITE, bh);
+ nr++;
+ }
+ put_bh(bh);
+ bh = next;
+ } while(bh != head);
+ goto done;
+}
+
+
+static int reiserfs_readpage (struct file *f, struct page * page)
+{
+ return block_read_full_page (page, reiserfs_get_block);
+}
+
+
+static int reiserfs_writepage (struct page * page, struct writeback_control *wbc)
+{
+ struct inode *inode = page->mapping->host ;
+ reiserfs_wait_on_write_block(inode->i_sb) ;
+ return reiserfs_write_full_page(page, wbc) ;
+}
+
+static int reiserfs_prepare_write(struct file *f, struct page *page,
+ unsigned from, unsigned to) {
+ struct inode *inode = page->mapping->host ;
+ int ret;
+ int old_ref = 0;
+
+ reiserfs_wait_on_write_block(inode->i_sb) ;
+ fix_tail_page_for_writing(page) ;
+ if (reiserfs_transaction_running(inode->i_sb)) {
+ struct reiserfs_transaction_handle *th;
+ th = (struct reiserfs_transaction_handle *)current->journal_info;
+ BUG_ON (!th->t_refcount);
+ BUG_ON (!th->t_trans_id);
+ old_ref = th->t_refcount;
+ th->t_refcount++;
+ }
+
+ ret = block_prepare_write(page, from, to, reiserfs_get_block) ;
+ if (ret && reiserfs_transaction_running(inode->i_sb)) {
+ struct reiserfs_transaction_handle *th = current->journal_info;
+ /* this gets a little ugly. If reiserfs_get_block returned an
+ * error and left a transacstion running, we've got to close it,
+ * and we've got to free handle if it was a persistent transaction.
+ *
+ * But, if we had nested into an existing transaction, we need
+ * to just drop the ref count on the handle.
+ *
+ * If old_ref == 0, the transaction is from reiserfs_get_block,
+ * and it was a persistent trans. Otherwise, it was nested above.
+ */
+ if (th->t_refcount > old_ref) {
+ if (old_ref)
+ th->t_refcount--;
+ else {
+ int err;
+ reiserfs_write_lock(inode->i_sb);
+ err = reiserfs_end_persistent_transaction(th);
+ reiserfs_write_unlock(inode->i_sb);
+ if (err)
+ ret = err;
+ }
+ }
+ }
+ return ret;
+
+}
+
+
+static sector_t reiserfs_aop_bmap(struct address_space *as, sector_t block) {
+ return generic_block_bmap(as, block, reiserfs_bmap) ;
+}
+
+static int reiserfs_commit_write(struct file *f, struct page *page,
+ unsigned from, unsigned to) {
+ struct inode *inode = page->mapping->host ;
+ loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
+ int ret = 0;
+ int update_sd = 0;
+ struct reiserfs_transaction_handle *th = NULL;
+
+ reiserfs_wait_on_write_block(inode->i_sb) ;
+ if (reiserfs_transaction_running(inode->i_sb)) {
+ th = current->journal_info;
+ }
+ reiserfs_commit_page(inode, page, from, to);
+
+ /* generic_commit_write does this for us, but does not update the
+ ** transaction tracking stuff when the size changes. So, we have
+ ** to do the i_size updates here.
+ */
+ if (pos > inode->i_size) {
+ struct reiserfs_transaction_handle myth ;
+ reiserfs_write_lock(inode->i_sb);
+ /* If the file have grown beyond the border where it
+ can have a tail, unmark it as needing a tail
+ packing */
+ if ( (have_large_tails (inode->i_sb) && inode->i_size > i_block_size (inode)*4) ||
+ (have_small_tails (inode->i_sb) && inode->i_size > i_block_size(inode)) )
+ REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask ;
+
+ ret = journal_begin(&myth, inode->i_sb, 1) ;
+ if (ret) {
+ reiserfs_write_unlock(inode->i_sb);
+ goto journal_error;
+ }
+ reiserfs_update_inode_transaction(inode) ;
+ inode->i_size = pos ;
+ reiserfs_update_sd(&myth, inode) ;
+ update_sd = 1;
+ ret = journal_end(&myth, inode->i_sb, 1) ;
+ reiserfs_write_unlock(inode->i_sb);
+ if (ret)
+ goto journal_error;
+ }
+ if (th) {
+ reiserfs_write_lock(inode->i_sb);
+ if (!update_sd)
+ reiserfs_update_sd(th, inode) ;
+ ret = reiserfs_end_persistent_transaction(th);
+ reiserfs_write_unlock(inode->i_sb);
+ if (ret)
+ goto out;
+ }
+
+ /* we test for O_SYNC here so we can commit the transaction
+ ** for any packed tails the file might have had
+ */
+ if (f && (f->f_flags & O_SYNC)) {
+ reiserfs_write_lock(inode->i_sb);
+ ret = reiserfs_commit_for_inode(inode) ;
+ reiserfs_write_unlock(inode->i_sb);
+ }
+out:
+ return ret ;
+
+journal_error:
+ if (th) {
+ reiserfs_write_lock(inode->i_sb);
+ if (!update_sd)
+ reiserfs_update_sd(th, inode) ;
+ ret = reiserfs_end_persistent_transaction(th);
+ reiserfs_write_unlock(inode->i_sb);
+ }
+
+ return ret;
+}
+
+void sd_attrs_to_i_attrs( __u16 sd_attrs, struct inode *inode )
+{
+ if( reiserfs_attrs( inode -> i_sb ) ) {
+ if( sd_attrs & REISERFS_SYNC_FL )
+ inode -> i_flags |= S_SYNC;
+ else
+ inode -> i_flags &= ~S_SYNC;
+ if( sd_attrs & REISERFS_IMMUTABLE_FL )
+ inode -> i_flags |= S_IMMUTABLE;
+ else
+ inode -> i_flags &= ~S_IMMUTABLE;
+ if( sd_attrs & REISERFS_APPEND_FL )
+ inode -> i_flags |= S_APPEND;
+ else
+ inode -> i_flags &= ~S_APPEND;
+ if( sd_attrs & REISERFS_NOATIME_FL )
+ inode -> i_flags |= S_NOATIME;
+ else
+ inode -> i_flags &= ~S_NOATIME;
+ if( sd_attrs & REISERFS_NOTAIL_FL )
+ REISERFS_I(inode)->i_flags |= i_nopack_mask;
+ else
+ REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
+ }
+}
+
+void i_attrs_to_sd_attrs( struct inode *inode, __u16 *sd_attrs )
+{
+ if( reiserfs_attrs( inode -> i_sb ) ) {
+ if( inode -> i_flags & S_IMMUTABLE )
+ *sd_attrs |= REISERFS_IMMUTABLE_FL;
+ else
+ *sd_attrs &= ~REISERFS_IMMUTABLE_FL;
+ if( inode -> i_flags & S_SYNC )
+ *sd_attrs |= REISERFS_SYNC_FL;
+ else
+ *sd_attrs &= ~REISERFS_SYNC_FL;
+ if( inode -> i_flags & S_NOATIME )
+ *sd_attrs |= REISERFS_NOATIME_FL;
+ else
+ *sd_attrs &= ~REISERFS_NOATIME_FL;
+ if( REISERFS_I(inode)->i_flags & i_nopack_mask )
+ *sd_attrs |= REISERFS_NOTAIL_FL;
+ else
+ *sd_attrs &= ~REISERFS_NOTAIL_FL;
+ }
+}
+
+/* decide if this buffer needs to stay around for data logging or ordered
+** write purposes
+*/
+static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh)
+{
+ int ret = 1 ;
+ struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb) ;
+
+ spin_lock(&j->j_dirty_buffers_lock) ;
+ if (!buffer_mapped(bh)) {
+ goto free_jh;
+ }
+ /* the page is locked, and the only places that log a data buffer
+ * also lock the page.
+ */
+ if (reiserfs_file_data_log(inode)) {
+ /*
+ * very conservative, leave the buffer pinned if
+ * anyone might need it.
+ */
+ if (buffer_journaled(bh) || buffer_journal_dirty(bh)) {
+ ret = 0 ;
+ }
+ } else
+ if (buffer_dirty(bh) || buffer_locked(bh)) {
+ struct reiserfs_journal_list *jl;
+ struct reiserfs_jh *jh = bh->b_private;
+
+ /* why is this safe?
+ * reiserfs_setattr updates i_size in the on disk
+ * stat data before allowing vmtruncate to be called.
+ *
+ * If buffer was put onto the ordered list for this
+ * transaction, we know for sure either this transaction
+ * or an older one already has updated i_size on disk,
+ * and this ordered data won't be referenced in the file
+ * if we crash.
+ *
+ * if the buffer was put onto the ordered list for an older
+ * transaction, we need to leave it around
+ */
+ if (jh && (jl = jh->jl) && jl != SB_JOURNAL(inode->i_sb)->j_current_jl)
+ ret = 0;
+ }
+free_jh:
+ if (ret && bh->b_private) {
+ reiserfs_free_jh(bh);
+ }
+ spin_unlock(&j->j_dirty_buffers_lock) ;
+ return ret ;
+}
+
+/* clm -- taken from fs/buffer.c:block_invalidate_page */
+static int reiserfs_invalidatepage(struct page *page, unsigned long offset)
+{
+ struct buffer_head *head, *bh, *next;
+ struct inode *inode = page->mapping->host;
+ unsigned int curr_off = 0;
+ int ret = 1;
+
+ BUG_ON(!PageLocked(page));
+
+ if (offset == 0)
+ ClearPageChecked(page);
+
+ if (!page_has_buffers(page))
+ goto out;
+
+ head = page_buffers(page);
+ bh = head;
+ do {
+ unsigned int next_off = curr_off + bh->b_size;
+ next = bh->b_this_page;
+
+ /*
+ * is this block fully invalidated?
+ */
+ if (offset <= curr_off) {
+ if (invalidatepage_can_drop(inode, bh))
+ reiserfs_unmap_buffer(bh);
+ else
+ ret = 0;
+ }
+ curr_off = next_off;
+ bh = next;
+ } while (bh != head);
+
+ /*
+ * We release buffers only if the entire page is being invalidated.
+ * The get_block cached value has been unconditionally invalidated,
+ * so real IO is not possible anymore.
+ */
+ if (!offset && ret)
+ ret = try_to_release_page(page, 0);
+out:
+ return ret;
+}
+
+static int reiserfs_set_page_dirty(struct page *page) {
+ struct inode *inode = page->mapping->host;
+ if (reiserfs_file_data_log(inode)) {
+ SetPageChecked(page);
+ return __set_page_dirty_nobuffers(page);
+ }
+ return __set_page_dirty_buffers(page);
+}
+
+/*
+ * Returns 1 if the page's buffers were dropped. The page is locked.
+ *
+ * Takes j_dirty_buffers_lock to protect the b_assoc_buffers list_heads
+ * in the buffers at page_buffers(page).
+ *
+ * even in -o notail mode, we can't be sure an old mount without -o notail
+ * didn't create files with tails.
+ */
+static int reiserfs_releasepage(struct page *page, int unused_gfp_flags)
+{
+ struct inode *inode = page->mapping->host ;
+ struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb) ;
+ struct buffer_head *head ;
+ struct buffer_head *bh ;
+ int ret = 1 ;
+
+ WARN_ON(PageChecked(page));
+ spin_lock(&j->j_dirty_buffers_lock) ;
+ head = page_buffers(page) ;
+ bh = head ;
+ do {
+ if (bh->b_private) {
+ if (!buffer_dirty(bh) && !buffer_locked(bh)) {
+ reiserfs_free_jh(bh);
+ } else {
+ ret = 0 ;
+ break ;
+ }
+ }
+ bh = bh->b_this_page ;
+ } while (bh != head) ;
+ if (ret)
+ ret = try_to_free_buffers(page) ;
+ spin_unlock(&j->j_dirty_buffers_lock) ;
+ return ret ;
+}
+
+/* We thank Mingming Cao for helping us understand in great detail what
+ to do in this section of the code. */
+static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb,
+ const struct iovec *iov, loff_t offset, unsigned long nr_segs)
+{
+ struct file *file = iocb->ki_filp;
+ struct inode *inode = file->f_mapping->host;
+
+ return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
+ offset, nr_segs, reiserfs_get_blocks_direct_io, NULL);
+}
+
+int reiserfs_setattr(struct dentry *dentry, struct iattr *attr) {
+ struct inode *inode = dentry->d_inode ;
+ int error ;
+ unsigned int ia_valid = attr->ia_valid;
+ reiserfs_write_lock(inode->i_sb);
+ if (attr->ia_valid & ATTR_SIZE) {
+ /* version 2 items will be caught by the s_maxbytes check
+ ** done for us in vmtruncate
+ */
+ if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
+ attr->ia_size > MAX_NON_LFS) {
+ error = -EFBIG ;
+ goto out;
+ }
+ /* fill in hole pointers in the expanding truncate case. */
+ if (attr->ia_size > inode->i_size) {
+ error = generic_cont_expand(inode, attr->ia_size) ;
+ if (REISERFS_I(inode)->i_prealloc_count > 0) {
+ int err;
+ struct reiserfs_transaction_handle th ;
+ /* we're changing at most 2 bitmaps, inode + super */
+ err = journal_begin(&th, inode->i_sb, 4) ;
+ if (!err) {
+ reiserfs_discard_prealloc (&th, inode);
+ err = journal_end(&th, inode->i_sb, 4) ;
+ }
+ if (err)
+ error = err;
+ }
+ if (error)
+ goto out;
+ }
+ }
+
+ if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) ||
+ ((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) &&
+ (get_inode_sd_version (inode) == STAT_DATA_V1)) {
+ /* stat data of format v3.5 has 16 bit uid and gid */
+ error = -EINVAL;
+ goto out;
+ }
+
+ error = inode_change_ok(inode, attr) ;
+ if (!error) {
+ if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
+ (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
+ error = reiserfs_chown_xattrs (inode, attr);
+
+ if (!error) {
+ struct reiserfs_transaction_handle th;
+
+ /* (user+group)*(old+new) structure - we count quota info and , inode write (sb, inode) */
+ journal_begin(&th, inode->i_sb, 4*REISERFS_QUOTA_INIT_BLOCKS+2);
+ error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
+ if (error) {
+ journal_end(&th, inode->i_sb, 4*REISERFS_QUOTA_INIT_BLOCKS+2);
+ goto out;
+ }
+ /* Update corresponding info in inode so that everything is in
+ * one transaction */
+ if (attr->ia_valid & ATTR_UID)
+ inode->i_uid = attr->ia_uid;
+ if (attr->ia_valid & ATTR_GID)
+ inode->i_gid = attr->ia_gid;
+ mark_inode_dirty(inode);
+ journal_end(&th, inode->i_sb, 4*REISERFS_QUOTA_INIT_BLOCKS+2);
+ }
+ }
+ if (!error)
+ error = inode_setattr(inode, attr) ;
+ }
+
+
+ if (!error && reiserfs_posixacl (inode->i_sb)) {
+ if (attr->ia_valid & ATTR_MODE)
+ error = reiserfs_acl_chmod (inode);
+ }
+
+out:
+ reiserfs_write_unlock(inode->i_sb);
+ return error ;
+}
+
+
+
+struct address_space_operations reiserfs_address_space_operations = {
+ .writepage = reiserfs_writepage,
+ .readpage = reiserfs_readpage,
+ .readpages = reiserfs_readpages,
+ .releasepage = reiserfs_releasepage,
+ .invalidatepage = reiserfs_invalidatepage,
+ .sync_page = block_sync_page,
+ .prepare_write = reiserfs_prepare_write,
+ .commit_write = reiserfs_commit_write,
+ .bmap = reiserfs_aop_bmap,
+ .direct_IO = reiserfs_direct_IO,
+ .set_page_dirty = reiserfs_set_page_dirty,
+} ;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 15:15:29 +0000