-/*\r
- * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)\r
- *\r
- *\r
- * HelenOS:\r
- * Copyright (c) 2012 Martin Sucha\r
- * Copyright (c) 2012 Frantisek Princ\r
- * All rights reserved.\r
- *\r
- * Redistribution and use in source and binary forms, with or without\r
- * modification, are permitted provided that the following conditions\r
- * are met:\r
- *\r
- * - Redistributions of source code must retain the above copyright\r
- * notice, this list of conditions and the following disclaimer.\r
- * - Redistributions in binary form must reproduce the above copyright\r
- * notice, this list of conditions and the following disclaimer in the\r
- * documentation and/or other materials provided with the distribution.\r
- * - The name of the author may not be used to endorse or promote products\r
- * derived from this software without specific prior written permission.\r
- *\r
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\r
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\r
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\r
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\r
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT\r
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\r
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\r
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\r
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF\r
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\r
- */\r
-\r
-/** @addtogroup lwext4\r
- * @{\r
- */\r
-/**\r
- * @file ext4_ialloc.c\r
- * @brief Inode allocation procedures.\r
- */\r
-\r
-#include "ext4_config.h"\r
-#include "ext4_types.h"\r
-#include "ext4_ialloc.h"\r
-#include "ext4_super.h"\r
-#include "ext4_fs.h"\r
-#include "ext4_blockdev.h"\r
-#include "ext4_block_group.h"\r
-#include "ext4_bitmap.h"\r
-\r
-/**@brief Convert i-node number to relative index in block group.\r
- * @param sb Superblock\r
- * @param inode I-node number to be converted\r
- * @return Index of the i-node in the block group\r
- */\r
-static uint32_t ext4_ialloc_inode2index_in_group(struct ext4_sblock *sb,\r
- uint32_t inode)\r
-{\r
- uint32_t inodes_per_group = ext4_get32(sb, inodes_per_group);\r
- return (inode - 1) % inodes_per_group;\r
-}\r
-\r
-/**@brief Convert relative index of i-node to absolute i-node number.\r
- * @param sb Superblock\r
- * @param index Index to be converted\r
- * @return Absolute number of the i-node\r
- *\r
- */\r
-static uint32_t ext4_ialloc_index_in_group2inode(struct ext4_sblock *sb,\r
- uint32_t index, uint32_t bgid)\r
-{\r
- uint32_t inodes_per_group = ext4_get32(sb, inodes_per_group);\r
- return bgid * inodes_per_group + (index + 1);\r
-}\r
-\r
-/**@brief Compute block group number from the i-node number.\r
- * @param sb Superblock\r
- * @param inode I-node number to be found the block group for\r
- * @return Block group number computed from i-node number\r
- */\r
-static uint32_t ext4_ialloc_get_bgid_of_inode(struct ext4_sblock *sb,\r
- uint32_t inode)\r
-{\r
- uint32_t inodes_per_group = ext4_get32(sb, inodes_per_group);\r
- return (inode - 1) / inodes_per_group;\r
-}\r
-\r
-int ext4_ialloc_free_inode(struct ext4_fs *fs, uint32_t index, bool is_dir)\r
-{\r
- struct ext4_sblock *sb = &fs->sb;\r
-\r
- /* Compute index of block group and load it */\r
- uint32_t block_group = ext4_ialloc_get_bgid_of_inode(sb, index);\r
-\r
- struct ext4_block_group_ref bg_ref;\r
- int rc = ext4_fs_get_block_group_ref(fs, block_group, &bg_ref);\r
- if (rc != EOK)\r
- return rc;\r
-\r
- /* Load i-node bitmap */\r
- uint32_t bitmap_block_addr =\r
- ext4_bg_get_inode_bitmap(bg_ref.block_group, sb);\r
-\r
- struct ext4_block bitmap_block;\r
- rc = ext4_block_get(fs->bdev, &bitmap_block, bitmap_block_addr);\r
- if (rc != EOK)\r
- return rc;\r
-\r
- /* Free i-node in the bitmap */\r
- uint32_t index_in_group = ext4_ialloc_inode2index_in_group(sb, index);\r
- ext4_bmap_bit_clr(bitmap_block.data, index_in_group);\r
- bitmap_block.dirty = true;\r
-\r
- /* Put back the block with bitmap */\r
- rc = ext4_block_set(fs->bdev, &bitmap_block);\r
- if (rc != EOK) {\r
- /* Error in saving bitmap */\r
- ext4_fs_put_block_group_ref(&bg_ref);\r
- return rc;\r
- }\r
-\r
- /* If released i-node is a directory, decrement used directories count\r
- */\r
- if (is_dir) {\r
- uint32_t bg_used_dirs =\r
- ext4_bg_get_used_dirs_count(bg_ref.block_group, sb);\r
- bg_used_dirs--;\r
- ext4_bg_set_used_dirs_count(bg_ref.block_group, sb,\r
- bg_used_dirs);\r
- }\r
-\r
- /* Update block group free inodes count */\r
- uint32_t free_inodes =\r
- ext4_bg_get_free_inodes_count(bg_ref.block_group, sb);\r
- free_inodes++;\r
- ext4_bg_set_free_inodes_count(bg_ref.block_group, sb, free_inodes);\r
-\r
- bg_ref.dirty = true;\r
-\r
- /* Put back the modified block group */\r
- rc = ext4_fs_put_block_group_ref(&bg_ref);\r
- if (rc != EOK)\r
- return rc;\r
-\r
- /* Update superblock free inodes count */\r
- ext4_set32(sb, free_inodes_count,\r
- ext4_get32(sb, free_inodes_count) + 1);\r
-\r
- return EOK;\r
-}\r
-\r
-int ext4_ialloc_alloc_inode(struct ext4_fs *fs, uint32_t *index, bool is_dir)\r
-{\r
- struct ext4_sblock *sb = &fs->sb;\r
-\r
- uint32_t bgid = fs->last_inode_bg_id;\r
- uint32_t bg_count = ext4_block_group_cnt(sb);\r
- uint32_t sb_free_inodes = ext4_get32(sb, free_inodes_count);\r
- bool rewind = false;\r
-\r
- /* Try to find free i-node in all block groups */\r
- while (bgid <= bg_count) {\r
-\r
- if (bgid == bg_count) {\r
- if (rewind)\r
- break;\r
- bg_count = fs->last_inode_bg_id;\r
- bgid = 0;\r
- rewind = true;\r
- continue;\r
- }\r
-\r
- /* Load block group to check */\r
- struct ext4_block_group_ref bg_ref;\r
- int rc = ext4_fs_get_block_group_ref(fs, bgid, &bg_ref);\r
- if (rc != EOK)\r
- return rc;\r
-\r
- struct ext4_bgroup *bg = bg_ref.block_group;\r
-\r
- /* Read necessary values for algorithm */\r
- uint32_t free_inodes = ext4_bg_get_free_inodes_count(bg, sb);\r
- uint32_t used_dirs = ext4_bg_get_used_dirs_count(bg, sb);\r
-\r
- /* Check if this block group is good candidate for allocation */\r
- if (free_inodes > 0) {\r
- /* Load block with bitmap */\r
- uint32_t bitmap_block_addr =\r
- ext4_bg_get_inode_bitmap(bg_ref.block_group, sb);\r
-\r
- struct ext4_block bitmap_block;\r
- rc = ext4_block_get(fs->bdev, &bitmap_block,\r
- bitmap_block_addr);\r
- if (rc != EOK) {\r
- ext4_fs_put_block_group_ref(&bg_ref);\r
- return rc;\r
- }\r
-\r
- /* Try to allocate i-node in the bitmap */\r
- uint32_t inodes_in_group =\r
- ext4_inodes_in_group_cnt(sb, bgid);\r
- uint32_t index_in_group;\r
-\r
- rc = ext4_bmap_bit_find_clr(bitmap_block.data, 0,\r
- inodes_in_group,\r
- &index_in_group);\r
- /* Block group has not any free i-node */\r
- if (rc == ENOSPC) {\r
- rc = ext4_block_set(fs->bdev, &bitmap_block);\r
- if (rc != EOK) {\r
- ext4_fs_put_block_group_ref(&bg_ref);\r
- return rc;\r
- }\r
-\r
- rc = ext4_fs_put_block_group_ref(&bg_ref);\r
- if (rc != EOK)\r
- return rc;\r
-\r
- continue;\r
- }\r
-\r
- ext4_bmap_bit_set(bitmap_block.data, index_in_group);\r
-\r
- /* Free i-node found, save the bitmap */\r
- bitmap_block.dirty = true;\r
-\r
- ext4_block_set(fs->bdev, &bitmap_block);\r
- if (rc != EOK) {\r
- ext4_fs_put_block_group_ref(&bg_ref);\r
- return rc;\r
- }\r
-\r
- /* Modify filesystem counters */\r
- free_inodes--;\r
- ext4_bg_set_free_inodes_count(bg, sb, free_inodes);\r
-\r
- /* Increment used directories counter */\r
- if (is_dir) {\r
- used_dirs++;\r
- ext4_bg_set_used_dirs_count(bg, sb, used_dirs);\r
- }\r
-\r
- /* Decrease unused inodes count */\r
- if (ext4_bg_has_flag(bg,\r
- EXT4_BLOCK_GROUP_ITABLE_ZEROED)) {\r
- uint32_t unused =\r
- ext4_bg_get_itable_unused(bg, sb);\r
-\r
- uint32_t inodes_in_group =\r
- ext4_inodes_in_group_cnt(sb, bgid);\r
-\r
- uint32_t free = inodes_in_group - unused;\r
-\r
- if (index_in_group >= free) {\r
- unused = inodes_in_group -\r
- (index_in_group + 1);\r
- ext4_bg_set_itable_unused(bg, sb,\r
- unused);\r
- }\r
- }\r
-\r
- /* Save modified block group */\r
- bg_ref.dirty = true;\r
-\r
- rc = ext4_fs_put_block_group_ref(&bg_ref);\r
- if (rc != EOK)\r
- return rc;\r
-\r
- /* Update superblock */\r
- sb_free_inodes--;\r
- ext4_set32(sb, free_inodes_count, sb_free_inodes);\r
-\r
- /* Compute the absolute i-nodex number */\r
- *index = ext4_ialloc_index_in_group2inode(\r
- sb, index_in_group, bgid);\r
-\r
- fs->last_inode_bg_id = bgid;\r
-\r
- return EOK;\r
- }\r
-\r
- /* Block group not modified, put it and jump to the next block\r
- * group */\r
- ext4_fs_put_block_group_ref(&bg_ref);\r
- if (rc != EOK)\r
- return rc;\r
-\r
- ++bgid;\r
- }\r
-\r
- return ENOSPC;\r
-}\r
-\r
-/**\r
- * @}\r
- */\r
+/*
+ * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
+ *
+ *
+ * HelenOS:
+ * Copyright (c) 2012 Martin Sucha
+ * Copyright (c) 2012 Frantisek Princ
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup lwext4
+ * @{
+ */
+/**
+ * @file ext4_ialloc.c
+ * @brief Inode allocation procedures.
+ */
+
+#include "ext4_config.h"
+#include "ext4_types.h"
+#include "ext4_ialloc.h"
+#include "ext4_super.h"
+#include "ext4_crc32c.h"
+#include "ext4_fs.h"
+#include "ext4_blockdev.h"
+#include "ext4_block_group.h"
+#include "ext4_bitmap.h"
+
+/**@brief Convert i-node number to relative index in block group.
+ * @param sb Superblock
+ * @param inode I-node number to be converted
+ * @return Index of the i-node in the block group
+ */
+static uint32_t ext4_ialloc_inode2index_in_group(struct ext4_sblock *sb,
+ uint32_t inode)
+{
+ uint32_t inodes_per_group = ext4_get32(sb, inodes_per_group);
+ return (inode - 1) % inodes_per_group;
+}
+
+/**@brief Convert relative index of i-node to absolute i-node number.
+ * @param sb Superblock
+ * @param index Index to be converted
+ * @return Absolute number of the i-node
+ *
+ */
+static uint32_t ext4_ialloc_index_in_group2inode(struct ext4_sblock *sb,
+ uint32_t index, uint32_t bgid)
+{
+ uint32_t inodes_per_group = ext4_get32(sb, inodes_per_group);
+ return bgid * inodes_per_group + (index + 1);
+}
+
+/**@brief Compute block group number from the i-node number.
+ * @param sb Superblock
+ * @param inode I-node number to be found the block group for
+ * @return Block group number computed from i-node number
+ */
+static uint32_t ext4_ialloc_get_bgid_of_inode(struct ext4_sblock *sb,
+ uint32_t inode)
+{
+ uint32_t inodes_per_group = ext4_get32(sb, inodes_per_group);
+ return (inode - 1) / inodes_per_group;
+}
+
+#if CONFIG_META_CSUM_ENABLE
+static uint32_t ext4_ialloc_bitmap_csum(struct ext4_sblock *sb,
+ void *bitmap)
+{
+ uint32_t checksum = 0;
+ if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM)) {
+ uint32_t inodes_per_group =
+ ext4_get32(sb, inodes_per_group);
+
+ /* First calculate crc32 checksum against fs uuid */
+ checksum = ext4_crc32c(EXT4_CRC32_INIT, sb->uuid,
+ sizeof(sb->uuid));
+ /* Then calculate crc32 checksum against inode bitmap */
+ checksum = ext4_crc32c(checksum, bitmap,
+ (inodes_per_group + 7) / 8);
+ }
+ return checksum;
+}
+#else
+#define ext4_ialloc_bitmap_csum(...) 0
+#endif
+
+void ext4_ialloc_set_bitmap_csum(struct ext4_sblock *sb,
+ struct ext4_bgroup *bg,
+ void *bitmap __unused)
+{
+ int desc_size = ext4_sb_get_desc_size(sb);
+ uint32_t checksum = ext4_ialloc_bitmap_csum(sb, bitmap);
+ uint16_t lo_checksum = to_le16(checksum & 0xFFFF),
+ hi_checksum = to_le16(checksum >> 16);
+
+ if (!ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM))
+ return;
+
+ /* See if we need to assign a 32bit checksum */
+ bg->inode_bitmap_csum_lo = lo_checksum;
+ if (desc_size == EXT4_MAX_BLOCK_GROUP_DESCRIPTOR_SIZE)
+ bg->inode_bitmap_csum_hi = hi_checksum;
+
+}
+
+#if CONFIG_META_CSUM_ENABLE
+static bool
+ext4_ialloc_verify_bitmap_csum(struct ext4_sblock *sb,
+ struct ext4_bgroup *bg,
+ void *bitmap __unused)
+{
+
+ int desc_size = ext4_sb_get_desc_size(sb);
+ uint32_t checksum = ext4_ialloc_bitmap_csum(sb, bitmap);
+ uint16_t lo_checksum = to_le16(checksum & 0xFFFF),
+ hi_checksum = to_le16(checksum >> 16);
+
+ if (!ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM))
+ return true;
+
+ if (bg->inode_bitmap_csum_lo != lo_checksum)
+ return false;
+
+ if (desc_size == EXT4_MAX_BLOCK_GROUP_DESCRIPTOR_SIZE)
+ if (bg->inode_bitmap_csum_hi != hi_checksum)
+ return false;
+
+ return true;
+}
+#else
+#define ext4_ialloc_verify_bitmap_csum(...) true
+#endif
+
+int ext4_ialloc_free_inode(struct ext4_fs *fs, uint32_t index, bool is_dir)
+{
+ struct ext4_sblock *sb = &fs->sb;
+
+ /* Compute index of block group and load it */
+ uint32_t block_group = ext4_ialloc_get_bgid_of_inode(sb, index);
+
+ struct ext4_block_group_ref bg_ref;
+ int rc = ext4_fs_get_block_group_ref(fs, block_group, &bg_ref);
+ if (rc != EOK)
+ return rc;
+
+ /* Load i-node bitmap */
+ uint32_t bitmap_block_addr =
+ ext4_bg_get_inode_bitmap(bg_ref.block_group, sb);
+
+ struct ext4_block bitmap_block;
+ rc = ext4_block_get(fs->bdev, &bitmap_block, bitmap_block_addr);
+ if (rc != EOK)
+ return rc;
+
+ if (!ext4_ialloc_verify_bitmap_csum(sb,
+ bg_ref.block_group,
+ bitmap_block.data)) {
+ ext4_dbg(DEBUG_IALLOC,
+ DBG_WARN "Bitmap checksum failed."
+ "Group: %" PRIu32"\n",
+ bg_ref.index);
+ }
+
+ /* Free i-node in the bitmap */
+ uint32_t index_in_group = ext4_ialloc_inode2index_in_group(sb, index);
+ ext4_bmap_bit_clr(bitmap_block.data, index_in_group);
+ ext4_ialloc_set_bitmap_csum(sb, bg_ref.block_group,
+ bitmap_block.data);
+ bitmap_block.dirty = true;
+
+ /* Put back the block with bitmap */
+ rc = ext4_block_set(fs->bdev, &bitmap_block);
+ if (rc != EOK) {
+ /* Error in saving bitmap */
+ ext4_fs_put_block_group_ref(&bg_ref);
+ return rc;
+ }
+
+ /* If released i-node is a directory, decrement used directories count
+ */
+ if (is_dir) {
+ uint32_t bg_used_dirs =
+ ext4_bg_get_used_dirs_count(bg_ref.block_group, sb);
+ bg_used_dirs--;
+ ext4_bg_set_used_dirs_count(bg_ref.block_group, sb,
+ bg_used_dirs);
+ }
+
+ /* Update block group free inodes count */
+ uint32_t free_inodes =
+ ext4_bg_get_free_inodes_count(bg_ref.block_group, sb);
+ free_inodes++;
+ ext4_bg_set_free_inodes_count(bg_ref.block_group, sb, free_inodes);
+
+ bg_ref.dirty = true;
+
+ /* Put back the modified block group */
+ rc = ext4_fs_put_block_group_ref(&bg_ref);
+ if (rc != EOK)
+ return rc;
+
+ /* Update superblock free inodes count */
+ ext4_set32(sb, free_inodes_count,
+ ext4_get32(sb, free_inodes_count) + 1);
+
+ return EOK;
+}
+
+int ext4_ialloc_alloc_inode(struct ext4_fs *fs, uint32_t *index, bool is_dir)
+{
+ struct ext4_sblock *sb = &fs->sb;
+
+ uint32_t bgid = fs->last_inode_bg_id;
+ uint32_t bg_count = ext4_block_group_cnt(sb);
+ uint32_t sb_free_inodes = ext4_get32(sb, free_inodes_count);
+ bool rewind = false;
+
+ /* Try to find free i-node in all block groups */
+ while (bgid <= bg_count) {
+
+ if (bgid == bg_count) {
+ if (rewind)
+ break;
+ bg_count = fs->last_inode_bg_id;
+ bgid = 0;
+ rewind = true;
+ continue;
+ }
+
+ /* Load block group to check */
+ struct ext4_block_group_ref bg_ref;
+ int rc = ext4_fs_get_block_group_ref(fs, bgid, &bg_ref);
+ if (rc != EOK)
+ return rc;
+
+ struct ext4_bgroup *bg = bg_ref.block_group;
+
+ /* Read necessary values for algorithm */
+ uint32_t free_inodes = ext4_bg_get_free_inodes_count(bg, sb);
+ uint32_t used_dirs = ext4_bg_get_used_dirs_count(bg, sb);
+
+ /* Check if this block group is good candidate for allocation */
+ if (free_inodes > 0) {
+ /* Load block with bitmap */
+ uint32_t bitmap_block_addr =
+ ext4_bg_get_inode_bitmap(bg_ref.block_group, sb);
+
+ struct ext4_block bitmap_block;
+ rc = ext4_block_get(fs->bdev, &bitmap_block,
+ bitmap_block_addr);
+ if (rc != EOK) {
+ ext4_fs_put_block_group_ref(&bg_ref);
+ return rc;
+ }
+
+ if (!ext4_ialloc_verify_bitmap_csum(sb,
+ bg_ref.block_group,
+ bitmap_block.data)) {
+ ext4_dbg(DEBUG_IALLOC,
+ DBG_WARN "Bitmap checksum failed."
+ "Group: %" PRIu32"\n",
+ bg_ref.index);
+ }
+
+ /* Try to allocate i-node in the bitmap */
+ uint32_t inodes_in_group =
+ ext4_inodes_in_group_cnt(sb, bgid);
+ uint32_t index_in_group;
+
+ rc = ext4_bmap_bit_find_clr(bitmap_block.data, 0,
+ inodes_in_group,
+ &index_in_group);
+ /* Block group has not any free i-node */
+ if (rc == ENOSPC) {
+ rc = ext4_block_set(fs->bdev, &bitmap_block);
+ if (rc != EOK) {
+ ext4_fs_put_block_group_ref(&bg_ref);
+ return rc;
+ }
+
+ rc = ext4_fs_put_block_group_ref(&bg_ref);
+ if (rc != EOK)
+ return rc;
+
+ continue;
+ }
+
+ ext4_bmap_bit_set(bitmap_block.data, index_in_group);
+
+ /* Free i-node found, save the bitmap */
+ ext4_ialloc_set_bitmap_csum(sb, bg_ref.block_group,
+ bitmap_block.data);
+ bitmap_block.dirty = true;
+
+ ext4_block_set(fs->bdev, &bitmap_block);
+ if (rc != EOK) {
+ ext4_fs_put_block_group_ref(&bg_ref);
+ return rc;
+ }
+
+ /* Modify filesystem counters */
+ free_inodes--;
+ ext4_bg_set_free_inodes_count(bg, sb, free_inodes);
+
+ /* Increment used directories counter */
+ if (is_dir) {
+ used_dirs++;
+ ext4_bg_set_used_dirs_count(bg, sb, used_dirs);
+ }
+
+ /* Decrease unused inodes count */
+ uint32_t unused =
+ ext4_bg_get_itable_unused(bg, sb);
+
+ uint32_t free = inodes_in_group - unused;
+
+ if (index_in_group >= free) {
+ unused = inodes_in_group -
+ (index_in_group + 1);
+ ext4_bg_set_itable_unused(bg, sb,
+ unused);
+ }
+
+ /* Save modified block group */
+ bg_ref.dirty = true;
+
+ rc = ext4_fs_put_block_group_ref(&bg_ref);
+ if (rc != EOK)
+ return rc;
+
+ /* Update superblock */
+ sb_free_inodes--;
+ ext4_set32(sb, free_inodes_count, sb_free_inodes);
+
+ /* Compute the absolute i-nodex number */
+ *index = ext4_ialloc_index_in_group2inode(
+ sb, index_in_group, bgid);
+
+ fs->last_inode_bg_id = bgid;
+
+ return EOK;
+ }
+
+ /* Block group not modified, put it and jump to the next block
+ * group */
+ ext4_fs_put_block_group_ref(&bg_ref);
+ if (rc != EOK)
+ return rc;
+
+ ++bgid;
+ }
+
+ return ENOSPC;
+}
+
+/**
+ * @}
+ */
projects / lwext4.git / blobdiff