* Copyright (C) 1997 Theodore Ts'o.
*
* %Begin-Header%
- * This file may be redistributed under the terms of the GNU Public
- * License.
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
* %End-Header%
*/
+#include "config.h"
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
struct ext2_icount_el {
ext2_ino_t ino;
- __u16 count;
+ __u32 count;
};
struct ext2_icount {
TDB_CONTEXT *tdb;
};
+/*
+ * We now use a 32-bit counter field because it doesn't cost us
+ * anything extra for the in-memory data structure, due to alignment
+ * padding. But there's no point changing the interface if most of
+ * the time we only care if the number is bigger than 65,000 or not.
+ * So use the following translation function to return a 16-bit count.
+ */
+#define icount_16_xlate(x) (((x) > 65500) ? 65500 : (x))
+
void ext2fs_free_icount(ext2_icount_t icount)
{
if (!icount)
return retval;
memset(icount, 0, sizeof(struct ext2_icount));
- retval = ext2fs_allocate_inode_bitmap(fs, 0, &icount->single);
+ retval = ext2fs_allocate_inode_bitmap(fs, "icount", &icount->single);
if (retval)
goto errout;
if (flags & EXT2_ICOUNT_OPT_INCREMENT) {
- retval = ext2fs_allocate_inode_bitmap(fs, 0,
+ retval = ext2fs_allocate_inode_bitmap(fs, "icount_inc",
&icount->multiple);
if (retval)
goto errout;
ext2_icount_t icount;
errcode_t retval;
char *fn, uuid[40];
+ ext2_ino_t num_inodes;
+ mode_t save_umask;
int fd;
retval = alloc_icount(fs, flags, &icount);
goto errout;
uuid_unparse(fs->super->s_uuid, uuid);
sprintf(fn, "%s/%s-icount-XXXXXX", tdb_dir, uuid);
+ save_umask = umask(077);
fd = mkstemp(fn);
-
- icount->tdb_fn = fn;
- icount->tdb = tdb_open(fn, 0, TDB_CLEAR_IF_FIRST,
- O_RDWR | O_CREAT | O_TRUNC, 0600);
- if (icount->tdb) {
- close(fd);
- *ret = icount;
- return 0;
+ if (fd < 0) {
+ retval = errno;
+ ext2fs_free_mem(&fn);
+ goto errout;
}
+ icount->tdb_fn = fn;
+ umask(save_umask);
+ /*
+ * This is an overestimate of the size that we will need; the
+ * ideal value is the number of used inodes with a count
+ * greater than 1. OTOH the times when we really need this is
+ * with the backup programs that use lots of hard links, in
+ * which case the number of inodes in use approaches the ideal
+ * value.
+ */
+ num_inodes = fs->super->s_inodes_count - fs->super->s_free_inodes_count;
- retval = errno;
+ icount->tdb = tdb_open(fn, num_inodes, TDB_NOLOCK | TDB_NOSYNC,
+ O_RDWR | O_CREAT | O_TRUNC, 0600);
close(fd);
-
+ if (icount->tdb == NULL) {
+ retval = errno;
+ goto errout;
+ }
+ *ret = icount;
+ return 0;
errout:
ext2fs_free_icount(icount);
return(retval);
printf("Icount allocated %u entries, %d bytes.\n",
icount->size, bytes);
#endif
- retval = ext2fs_get_mem(bytes, &icount->list);
+ retval = ext2fs_get_array(icount->size, sizeof(struct ext2_icount_el),
+ &icount->list);
if (retval)
goto errout;
memset(icount->list, 0, bytes);
static struct ext2_icount_el *get_icount_el(ext2_icount_t icount,
ext2_ino_t ino, int create)
{
- float range;
int low, high, mid;
- ext2_ino_t lowval, highval;
if (!icount || !icount->list)
return 0;
low = 0;
high = (int) icount->count-1;
while (low <= high) {
-#if 0
- mid = (low+high)/2;
-#else
- if (low == high)
- mid = low;
- else {
- /* Interpolate for efficiency */
- lowval = icount->list[low].ino;
- highval = icount->list[high].ino;
-
- if (ino < lowval)
- range = 0;
- else if (ino > highval)
- range = 1;
- else {
- range = ((float) (ino - lowval)) /
- (highval - lowval);
- if (range > 0.9)
- range = 0.9;
- if (range < 0.1)
- range = 0.1;
- }
- mid = low + ((int) (range * (high-low)));
- }
-#endif
+ mid = ((unsigned)low + (unsigned)high) >> 1;
if (ino == icount->list[mid].ino) {
icount->cursor = mid+1;
return &icount->list[mid];
}
static errcode_t set_inode_count(ext2_icount_t icount, ext2_ino_t ino,
- __u16 count)
+ __u32 count)
{
struct ext2_icount_el *el;
TDB_DATA key, data;
key.dptr = (unsigned char *) &ino;
key.dsize = sizeof(ext2_ino_t);
data.dptr = (unsigned char *) &count;
- data.dsize = sizeof(__u16);
+ data.dsize = sizeof(__u32);
if (count) {
if (tdb_store(icount->tdb, key, data, TDB_REPLACE))
return tdb_error(icount->tdb) +
}
static errcode_t get_inode_count(ext2_icount_t icount, ext2_ino_t ino,
- __u16 *count)
+ __u32 *count)
{
struct ext2_icount_el *el;
TDB_DATA key, data;
return tdb_error(icount->tdb) + EXT2_ET_TDB_SUCCESS;
}
- *count = *((__u16 *) data.dptr);
+ *count = *((__u32 *) data.dptr);
free(data.dptr);
return 0;
}
errcode_t ext2fs_icount_fetch(ext2_icount_t icount, ext2_ino_t ino, __u16 *ret)
{
- struct ext2_icount_el *el;
-
+ __u32 val;
EXT2_CHECK_MAGIC(icount, EXT2_ET_MAGIC_ICOUNT);
if (!ino || (ino > icount->num_inodes))
return EXT2_ET_INVALID_ARGUMENT;
- if (ext2fs_test_inode_bitmap(icount->single, ino)) {
+ if (ext2fs_test_inode_bitmap2(icount->single, ino)) {
*ret = 1;
return 0;
}
if (icount->multiple &&
- !ext2fs_test_inode_bitmap(icount->multiple, ino)) {
+ !ext2fs_test_inode_bitmap2(icount->multiple, ino)) {
*ret = 0;
return 0;
}
- get_inode_count(icount, ino, ret);
+ get_inode_count(icount, ino, &val);
+ *ret = icount_16_xlate(val);
return 0;
}
errcode_t ext2fs_icount_increment(ext2_icount_t icount, ext2_ino_t ino,
__u16 *ret)
{
- struct ext2_icount_el *el;
- __u16 curr_value;
+ __u32 curr_value;
EXT2_CHECK_MAGIC(icount, EXT2_ET_MAGIC_ICOUNT);
if (!ino || (ino > icount->num_inodes))
return EXT2_ET_INVALID_ARGUMENT;
- if (ext2fs_test_inode_bitmap(icount->single, ino)) {
+ if (ext2fs_test_inode_bitmap2(icount->single, ino)) {
/*
* If the existing count is 1, then we know there is
* no entry in the list.
if (set_inode_count(icount, ino, 2))
return EXT2_ET_NO_MEMORY;
curr_value = 2;
- ext2fs_unmark_inode_bitmap(icount->single, ino);
+ ext2fs_unmark_inode_bitmap2(icount->single, ino);
} else if (icount->multiple) {
/*
* The count is either zero or greater than 1; if the
* inode is set in icount->multiple, then there should
* be an entry in the list, so we need to fix it.
*/
- if (ext2fs_test_inode_bitmap(icount->multiple, ino)) {
+ if (ext2fs_test_inode_bitmap2(icount->multiple, ino)) {
get_inode_count(icount, ino, &curr_value);
curr_value++;
if (set_inode_count(icount, ino, curr_value))
* The count was zero; mark the single bitmap
* and return.
*/
- zero_count:
- ext2fs_mark_inode_bitmap(icount->single, ino);
+ ext2fs_mark_inode_bitmap2(icount->single, ino);
if (ret)
*ret = 1;
return 0;
return EXT2_ET_NO_MEMORY;
}
if (icount->multiple)
- ext2fs_mark_inode_bitmap(icount->multiple, ino);
+ ext2fs_mark_inode_bitmap2(icount->multiple, ino);
if (ret)
- *ret = curr_value;
+ *ret = icount_16_xlate(curr_value);
return 0;
}
errcode_t ext2fs_icount_decrement(ext2_icount_t icount, ext2_ino_t ino,
__u16 *ret)
{
- __u16 curr_value;
+ __u32 curr_value;
if (!ino || (ino > icount->num_inodes))
return EXT2_ET_INVALID_ARGUMENT;
EXT2_CHECK_MAGIC(icount, EXT2_ET_MAGIC_ICOUNT);
- if (ext2fs_test_inode_bitmap(icount->single, ino)) {
- ext2fs_unmark_inode_bitmap(icount->single, ino);
+ if (ext2fs_test_inode_bitmap2(icount->single, ino)) {
+ ext2fs_unmark_inode_bitmap2(icount->single, ino);
if (icount->multiple)
- ext2fs_unmark_inode_bitmap(icount->multiple, ino);
+ ext2fs_unmark_inode_bitmap2(icount->multiple, ino);
else {
set_inode_count(icount, ino, 0);
}
}
if (icount->multiple &&
- !ext2fs_test_inode_bitmap(icount->multiple, ino))
+ !ext2fs_test_inode_bitmap2(icount->multiple, ino))
return EXT2_ET_INVALID_ARGUMENT;
get_inode_count(icount, ino, &curr_value);
return EXT2_ET_NO_MEMORY;
if (curr_value == 1)
- ext2fs_mark_inode_bitmap(icount->single, ino);
+ ext2fs_mark_inode_bitmap2(icount->single, ino);
if ((curr_value == 0) && icount->multiple)
- ext2fs_unmark_inode_bitmap(icount->multiple, ino);
+ ext2fs_unmark_inode_bitmap2(icount->multiple, ino);
if (ret)
- *ret = curr_value;
+ *ret = icount_16_xlate(curr_value);
return 0;
}
EXT2_CHECK_MAGIC(icount, EXT2_ET_MAGIC_ICOUNT);
if (count == 1) {
- ext2fs_mark_inode_bitmap(icount->single, ino);
+ ext2fs_mark_inode_bitmap2(icount->single, ino);
if (icount->multiple)
- ext2fs_unmark_inode_bitmap(icount->multiple, ino);
+ ext2fs_unmark_inode_bitmap2(icount->multiple, ino);
return 0;
}
if (count == 0) {
- ext2fs_unmark_inode_bitmap(icount->single, ino);
+ ext2fs_unmark_inode_bitmap2(icount->single, ino);
if (icount->multiple) {
/*
* If the icount->multiple bitmap is enabled,
* we can just clear both bitmaps and we're done
*/
- ext2fs_unmark_inode_bitmap(icount->multiple, ino);
+ ext2fs_unmark_inode_bitmap2(icount->multiple, ino);
} else
set_inode_count(icount, ino, 0);
return 0;
if (set_inode_count(icount, ino, count))
return EXT2_ET_NO_MEMORY;
- ext2fs_unmark_inode_bitmap(icount->single, ino);
+ ext2fs_unmark_inode_bitmap2(icount->single, ino);
if (icount->multiple)
- ext2fs_mark_inode_bitmap(icount->multiple, ino);
+ ext2fs_mark_inode_bitmap2(icount->multiple, ino);
return 0;
}
static void setup(void)
{
errcode_t retval;
- int i;
struct ext2_super_block param;
initialize_ext2_error_table();
memset(¶m, 0, sizeof(param));
- param.s_blocks_count = 12000;
+ ext2fs_blocks_count_set(¶m, 12000);
- retval = ext2fs_initialize("test fs", 0, ¶m,
+ retval = ext2fs_initialize("test fs", EXT2_FLAG_64BITS, ¶m,
test_io_manager, &test_fs);
if (retval) {
com_err("setup", retval,
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff