--- /dev/null
+/*
+ * linux/fs/ufs/util.c
+ *
+ * Copyright (C) 1998
+ * Daniel Pirkl <daniel.pirkl@email.cz>
+ * Charles University, Faculty of Mathematics and Physics
+ */
+
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/buffer_head.h>
+
+#include "ufs_fs.h"
+#include "ufs.h"
+#include "swab.h"
+#include "util.h"
+
+struct ufs_buffer_head * _ubh_bread_ (struct ufs_sb_private_info * uspi,
+ struct super_block *sb, u64 fragment, u64 size)
+{
+ struct ufs_buffer_head * ubh;
+ unsigned i, j ;
+ u64 count = 0;
+ if (size & ~uspi->s_fmask)
+ return NULL;
+ count = size >> uspi->s_fshift;
+ if (count > UFS_MAXFRAG)
+ return NULL;
+ ubh = kmalloc (sizeof (struct ufs_buffer_head), GFP_NOFS);
+ if (!ubh)
+ return NULL;
+ ubh->fragment = fragment;
+ ubh->count = count;
+ for (i = 0; i < count; i++)
+ if (!(ubh->bh[i] = sb_bread(sb, fragment + i)))
+ goto failed;
+ for (; i < UFS_MAXFRAG; i++)
+ ubh->bh[i] = NULL;
+ return ubh;
+failed:
+ for (j = 0; j < i; j++)
+ brelse (ubh->bh[j]);
+ kfree(ubh);
+ return NULL;
+}
+
+struct ufs_buffer_head * ubh_bread_uspi (struct ufs_sb_private_info * uspi,
+ struct super_block *sb, u64 fragment, u64 size)
+{
+ unsigned i, j;
+ u64 count = 0;
+ if (size & ~uspi->s_fmask)
+ return NULL;
+ count = size >> uspi->s_fshift;
+ if (count <= 0 || count > UFS_MAXFRAG)
+ return NULL;
+ USPI_UBH(uspi)->fragment = fragment;
+ USPI_UBH(uspi)->count = count;
+ for (i = 0; i < count; i++)
+ if (!(USPI_UBH(uspi)->bh[i] = sb_bread(sb, fragment + i)))
+ goto failed;
+ for (; i < UFS_MAXFRAG; i++)
+ USPI_UBH(uspi)->bh[i] = NULL;
+ return USPI_UBH(uspi);
+failed:
+ for (j = 0; j < i; j++)
+ brelse (USPI_UBH(uspi)->bh[j]);
+ return NULL;
+}
+
+void ubh_brelse (struct ufs_buffer_head * ubh)
+{
+ unsigned i;
+ if (!ubh)
+ return;
+ for (i = 0; i < ubh->count; i++)
+ brelse (ubh->bh[i]);
+ kfree (ubh);
+}
+
+void ubh_brelse_uspi (struct ufs_sb_private_info * uspi)
+{
+ unsigned i;
+ if (!USPI_UBH(uspi))
+ return;
+ for ( i = 0; i < USPI_UBH(uspi)->count; i++ ) {
+ brelse (USPI_UBH(uspi)->bh[i]);
+ USPI_UBH(uspi)->bh[i] = NULL;
+ }
+}
+
+void ubh_mark_buffer_dirty (struct ufs_buffer_head * ubh)
+{
+ unsigned i;
+ if (!ubh)
+ return;
+ for ( i = 0; i < ubh->count; i++ )
+ mark_buffer_dirty (ubh->bh[i]);
+}
+
+void ubh_mark_buffer_uptodate (struct ufs_buffer_head * ubh, int flag)
+{
+ unsigned i;
+ if (!ubh)
+ return;
+ if (flag) {
+ for ( i = 0; i < ubh->count; i++ )
+ set_buffer_uptodate (ubh->bh[i]);
+ } else {
+ for ( i = 0; i < ubh->count; i++ )
+ clear_buffer_uptodate (ubh->bh[i]);
+ }
+}
+
+void ubh_sync_block(struct ufs_buffer_head *ubh)
+{
+ if (ubh) {
+ unsigned i;
+
+ for (i = 0; i < ubh->count; i++)
+ write_dirty_buffer(ubh->bh[i], WRITE);
+
+ for (i = 0; i < ubh->count; i++)
+ wait_on_buffer(ubh->bh[i]);
+ }
+}
+
+void ubh_bforget (struct ufs_buffer_head * ubh)
+{
+ unsigned i;
+ if (!ubh)
+ return;
+ for ( i = 0; i < ubh->count; i++ ) if ( ubh->bh[i] )
+ bforget (ubh->bh[i]);
+}
+
+int ubh_buffer_dirty (struct ufs_buffer_head * ubh)
+{
+ unsigned i;
+ unsigned result = 0;
+ if (!ubh)
+ return 0;
+ for ( i = 0; i < ubh->count; i++ )
+ result |= buffer_dirty(ubh->bh[i]);
+ return result;
+}
+
+void _ubh_ubhcpymem_(struct ufs_sb_private_info * uspi,
+ unsigned char * mem, struct ufs_buffer_head * ubh, unsigned size)
+{
+ unsigned len, bhno;
+ if (size > (ubh->count << uspi->s_fshift))
+ size = ubh->count << uspi->s_fshift;
+ bhno = 0;
+ while (size) {
+ len = min_t(unsigned int, size, uspi->s_fsize);
+ memcpy (mem, ubh->bh[bhno]->b_data, len);
+ mem += uspi->s_fsize;
+ size -= len;
+ bhno++;
+ }
+}
+
+void _ubh_memcpyubh_(struct ufs_sb_private_info * uspi,
+ struct ufs_buffer_head * ubh, unsigned char * mem, unsigned size)
+{
+ unsigned len, bhno;
+ if (size > (ubh->count << uspi->s_fshift))
+ size = ubh->count << uspi->s_fshift;
+ bhno = 0;
+ while (size) {
+ len = min_t(unsigned int, size, uspi->s_fsize);
+ memcpy (ubh->bh[bhno]->b_data, mem, len);
+ mem += uspi->s_fsize;
+ size -= len;
+ bhno++;
+ }
+}
+
+dev_t
+ufs_get_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi)
+{
+ __u32 fs32;
+ dev_t dev;
+
+ if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
+ fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[1]);
+ else
+ fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[0]);
+ switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
+ case UFS_ST_SUNx86:
+ case UFS_ST_SUN:
+ if ((fs32 & 0xffff0000) == 0 ||
+ (fs32 & 0xffff0000) == 0xffff0000)
+ dev = old_decode_dev(fs32 & 0x7fff);
+ else
+ dev = MKDEV(sysv_major(fs32), sysv_minor(fs32));
+ break;
+
+ default:
+ dev = old_decode_dev(fs32);
+ break;
+ }
+ return dev;
+}
+
+void
+ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev)
+{
+ __u32 fs32;
+
+ switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
+ case UFS_ST_SUNx86:
+ case UFS_ST_SUN:
+ fs32 = sysv_encode_dev(dev);
+ if ((fs32 & 0xffff8000) == 0) {
+ fs32 = old_encode_dev(dev);
+ }
+ break;
+
+ default:
+ fs32 = old_encode_dev(dev);
+ break;
+ }
+ if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
+ ufsi->i_u1.i_data[1] = cpu_to_fs32(sb, fs32);
+ else
+ ufsi->i_u1.i_data[0] = cpu_to_fs32(sb, fs32);
+}
+
+/**
+ * ufs_get_locked_page() - locate, pin and lock a pagecache page, if not exist
+ * read it from disk.
+ * @mapping: the address_space to search
+ * @index: the page index
+ *
+ * Locates the desired pagecache page, if not exist we'll read it,
+ * locks it, increments its reference
+ * count and returns its address.
+ *
+ */
+
+struct page *ufs_get_locked_page(struct address_space *mapping,
+ pgoff_t index)
+{
+ struct page *page;
+
+ page = find_lock_page(mapping, index);
+ if (!page) {
+ page = read_mapping_page(mapping, index, NULL);
+
+ if (IS_ERR(page)) {
+ printk(KERN_ERR "ufs_change_blocknr: "
+ "read_mapping_page error: ino %lu, index: %lu\n",
+ mapping->host->i_ino, index);
+ goto out;
+ }
+
+ lock_page(page);
+
+ if (unlikely(page->mapping == NULL)) {
+ /* Truncate got there first */
+ unlock_page(page);
+ page_cache_release(page);
+ page = NULL;
+ goto out;
+ }
+
+ if (!PageUptodate(page) || PageError(page)) {
+ unlock_page(page);
+ page_cache_release(page);
+
+ printk(KERN_ERR "ufs_change_blocknr: "
+ "can not read page: ino %lu, index: %lu\n",
+ mapping->host->i_ino, index);
+
+ page = ERR_PTR(-EIO);
+ }
+ }
+out:
+ return page;
+}
Code Review / kvmfornfv.git / blobdiff