--- /dev/null
+/*
+ * linux/fs/ext4/ialloc.c
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ *
+ * BSD ufs-inspired inode and directory allocation by
+ * Stephen Tweedie (sct@redhat.com), 1993
+ * Big-endian to little-endian byte-swapping/bitmaps by
+ * David S. Miller (davem@caip.rutgers.edu), 1995
+ */
+
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/jbd2.h>
+#include <linux/ext4_fs.h>
+#include <linux/ext4_jbd2.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/quotaops.h>
+#include <linux/buffer_head.h>
+#include <linux/random.h>
+#include <linux/bitops.h>
+#include <linux/blkdev.h>
+#include <linux/vs_dlimit.h>
+#include <linux/vs_tag.h>
+#include <asm/byteorder.h>
+
+#include "xattr.h"
+#include "acl.h"
+
+/*
+ * ialloc.c contains the inodes allocation and deallocation routines
+ */
+
+/*
+ * The free inodes are managed by bitmaps. A file system contains several
+ * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap
+ * block for inodes, N blocks for the inode table and data blocks.
+ *
+ * The file system contains group descriptors which are located after the
+ * super block. Each descriptor contains the number of the bitmap block and
+ * the free blocks count in the block.
+ */
+
+
+/*
+ * Read the inode allocation bitmap for a given block_group, reading
+ * into the specified slot in the superblock's bitmap cache.
+ *
+ * Return buffer_head of bitmap on success or NULL.
+ */
+static struct buffer_head *
+read_inode_bitmap(struct super_block * sb, unsigned long block_group)
+{
+ struct ext4_group_desc *desc;
+ struct buffer_head *bh = NULL;
+
+ desc = ext4_get_group_desc(sb, block_group, NULL);
+ if (!desc)
+ goto error_out;
+
+ bh = sb_bread(sb, ext4_inode_bitmap(sb, desc));
+ if (!bh)
+ ext4_error(sb, "read_inode_bitmap",
+ "Cannot read inode bitmap - "
+ "block_group = %lu, inode_bitmap = %llu",
+ block_group, ext4_inode_bitmap(sb, desc));
+error_out:
+ return bh;
+}
+
+/*
+ * NOTE! When we get the inode, we're the only people
+ * that have access to it, and as such there are no
+ * race conditions we have to worry about. The inode
+ * is not on the hash-lists, and it cannot be reached
+ * through the filesystem because the directory entry
+ * has been deleted earlier.
+ *
+ * HOWEVER: we must make sure that we get no aliases,
+ * which means that we have to call "clear_inode()"
+ * _before_ we mark the inode not in use in the inode
+ * bitmaps. Otherwise a newly created file might use
+ * the same inode number (not actually the same pointer
+ * though), and then we'd have two inodes sharing the
+ * same inode number and space on the harddisk.
+ */
+void ext4_free_inode (handle_t *handle, struct inode * inode)
+{
+ struct super_block * sb = inode->i_sb;
+ int is_directory;
+ unsigned long ino;
+ struct buffer_head *bitmap_bh = NULL;
+ struct buffer_head *bh2;
+ unsigned long block_group;
+ unsigned long bit;
+ struct ext4_group_desc * gdp;
+ struct ext4_super_block * es;
+ struct ext4_sb_info *sbi;
+ int fatal = 0, err;
+
+ if (atomic_read(&inode->i_count) > 1) {
+ printk ("ext4_free_inode: inode has count=%d\n",
+ atomic_read(&inode->i_count));
+ return;
+ }
+ if (inode->i_nlink) {
+ printk ("ext4_free_inode: inode has nlink=%d\n",
+ inode->i_nlink);
+ return;
+ }
+ if (!sb) {
+ printk("ext4_free_inode: inode on nonexistent device\n");
+ return;
+ }
+ sbi = EXT4_SB(sb);
+
+ ino = inode->i_ino;
+ ext4_debug ("freeing inode %lu\n", ino);
+
+ /*
+ * Note: we must free any quota before locking the superblock,
+ * as writing the quota to disk may need the lock as well.
+ */
+ DQUOT_INIT(inode);
+ ext4_xattr_delete_inode(handle, inode);
+ DQUOT_FREE_INODE(inode);
+ DQUOT_DROP(inode);
+ DLIMIT_FREE_INODE(inode);
+
+ is_directory = S_ISDIR(inode->i_mode);
+
+ /* Do this BEFORE marking the inode not in use or returning an error */
+ clear_inode (inode);
+
+ es = EXT4_SB(sb)->s_es;
+ if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
+ ext4_error (sb, "ext4_free_inode",
+ "reserved or nonexistent inode %lu", ino);
+ goto error_return;
+ }
+ block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
+ bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb);
+ bitmap_bh = read_inode_bitmap(sb, block_group);
+ if (!bitmap_bh)
+ goto error_return;
+
+ BUFFER_TRACE(bitmap_bh, "get_write_access");
+ fatal = ext4_journal_get_write_access(handle, bitmap_bh);
+ if (fatal)
+ goto error_return;
+
+ /* Ok, now we can actually update the inode bitmaps.. */
+ if (!ext4_clear_bit_atomic(sb_bgl_lock(sbi, block_group),
+ bit, bitmap_bh->b_data))
+ ext4_error (sb, "ext4_free_inode",
+ "bit already cleared for inode %lu", ino);
+ else {
+ gdp = ext4_get_group_desc (sb, block_group, &bh2);
+
+ BUFFER_TRACE(bh2, "get_write_access");
+ fatal = ext4_journal_get_write_access(handle, bh2);
+ if (fatal) goto error_return;
+
+ if (gdp) {
+ spin_lock(sb_bgl_lock(sbi, block_group));
+ gdp->bg_free_inodes_count = cpu_to_le16(
+ le16_to_cpu(gdp->bg_free_inodes_count) + 1);
+ if (is_directory)
+ gdp->bg_used_dirs_count = cpu_to_le16(
+ le16_to_cpu(gdp->bg_used_dirs_count) - 1);
+ spin_unlock(sb_bgl_lock(sbi, block_group));
+ percpu_counter_inc(&sbi->s_freeinodes_counter);
+ if (is_directory)
+ percpu_counter_dec(&sbi->s_dirs_counter);
+
+ }
+ BUFFER_TRACE(bh2, "call ext4_journal_dirty_metadata");
+ err = ext4_journal_dirty_metadata(handle, bh2);
+ if (!fatal) fatal = err;
+ }
+ BUFFER_TRACE(bitmap_bh, "call ext4_journal_dirty_metadata");
+ err = ext4_journal_dirty_metadata(handle, bitmap_bh);
+ if (!fatal)
+ fatal = err;
+ sb->s_dirt = 1;
+error_return:
+ brelse(bitmap_bh);
+ ext4_std_error(sb, fatal);
+}
+
+/*
+ * There are two policies for allocating an inode. If the new inode is
+ * a directory, then a forward search is made for a block group with both
+ * free space and a low directory-to-inode ratio; if that fails, then of
+ * the groups with above-average free space, that group with the fewest
+ * directories already is chosen.
+ *
+ * For other inodes, search forward from the parent directory\'s block
+ * group to find a free inode.
+ */
+static int find_group_dir(struct super_block *sb, struct inode *parent)
+{
+ int ngroups = EXT4_SB(sb)->s_groups_count;
+ unsigned int freei, avefreei;
+ struct ext4_group_desc *desc, *best_desc = NULL;
+ struct buffer_head *bh;
+ int group, best_group = -1;
+
+ freei = percpu_counter_read_positive(&EXT4_SB(sb)->s_freeinodes_counter);
+ avefreei = freei / ngroups;
+
+ for (group = 0; group < ngroups; group++) {
+ desc = ext4_get_group_desc (sb, group, &bh);
+ if (!desc || !desc->bg_free_inodes_count)
+ continue;
+ if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei)
+ continue;
+ if (!best_desc ||
+ (le16_to_cpu(desc->bg_free_blocks_count) >
+ le16_to_cpu(best_desc->bg_free_blocks_count))) {
+ best_group = group;
+ best_desc = desc;
+ }
+ }
+ return best_group;
+}
+
+/*
+ * Orlov's allocator for directories.
+ *
+ * We always try to spread first-level directories.
+ *
+ * If there are blockgroups with both free inodes and free blocks counts
+ * not worse than average we return one with smallest directory count.
+ * Otherwise we simply return a random group.
+ *
+ * For the rest rules look so:
+ *
+ * It's OK to put directory into a group unless
+ * it has too many directories already (max_dirs) or
+ * it has too few free inodes left (min_inodes) or
+ * it has too few free blocks left (min_blocks) or
+ * it's already running too large debt (max_debt).
+ * Parent's group is prefered, if it doesn't satisfy these
+ * conditions we search cyclically through the rest. If none
+ * of the groups look good we just look for a group with more
+ * free inodes than average (starting at parent's group).
+ *
+ * Debt is incremented each time we allocate a directory and decremented
+ * when we allocate an inode, within 0--255.
+ */
+
+#define INODE_COST 64
+#define BLOCK_COST 256
+
+static int find_group_orlov(struct super_block *sb, struct inode *parent)
+{
+ int parent_group = EXT4_I(parent)->i_block_group;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ struct ext4_super_block *es = sbi->s_es;
+ int ngroups = sbi->s_groups_count;
+ int inodes_per_group = EXT4_INODES_PER_GROUP(sb);
+ unsigned int freei, avefreei;
+ ext4_fsblk_t freeb, avefreeb;
+ ext4_fsblk_t blocks_per_dir;
+ unsigned int ndirs;
+ int max_debt, max_dirs, min_inodes;
+ ext4_grpblk_t min_blocks;
+ int group = -1, i;
+ struct ext4_group_desc *desc;
+ struct buffer_head *bh;
+
+ freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter);
+ avefreei = freei / ngroups;
+ freeb = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
+ avefreeb = freeb;
+ do_div(avefreeb, ngroups);
+ ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter);
+
+ if ((parent == sb->s_root->d_inode) ||
+ (EXT4_I(parent)->i_flags & EXT4_TOPDIR_FL)) {
+ int best_ndir = inodes_per_group;
+ int best_group = -1;
+
+ get_random_bytes(&group, sizeof(group));
+ parent_group = (unsigned)group % ngroups;
+ for (i = 0; i < ngroups; i++) {
+ group = (parent_group + i) % ngroups;
+ desc = ext4_get_group_desc (sb, group, &bh);
+ if (!desc || !desc->bg_free_inodes_count)
+ continue;
+ if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir)
+ continue;
+ if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei)
+ continue;
+ if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb)
+ continue;
+ best_group = group;
+ best_ndir = le16_to_cpu(desc->bg_used_dirs_count);
+ }
+ if (best_group >= 0)
+ return best_group;
+ goto fallback;
+ }
+
+ blocks_per_dir = ext4_blocks_count(es) - freeb;
+ do_div(blocks_per_dir, ndirs);
+
+ max_dirs = ndirs / ngroups + inodes_per_group / 16;
+ min_inodes = avefreei - inodes_per_group / 4;
+ min_blocks = avefreeb - EXT4_BLOCKS_PER_GROUP(sb) / 4;
+
+ max_debt = EXT4_BLOCKS_PER_GROUP(sb);
+ max_debt /= max_t(int, blocks_per_dir, BLOCK_COST);
+ if (max_debt * INODE_COST > inodes_per_group)
+ max_debt = inodes_per_group / INODE_COST;
+ if (max_debt > 255)
+ max_debt = 255;
+ if (max_debt == 0)
+ max_debt = 1;
+
+ for (i = 0; i < ngroups; i++) {
+ group = (parent_group + i) % ngroups;
+ desc = ext4_get_group_desc (sb, group, &bh);
+ if (!desc || !desc->bg_free_inodes_count)
+ continue;
+ if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs)
+ continue;
+ if (le16_to_cpu(desc->bg_free_inodes_count) < min_inodes)
+ continue;
+ if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks)
+ continue;
+ return group;
+ }
+
+fallback:
+ for (i = 0; i < ngroups; i++) {
+ group = (parent_group + i) % ngroups;
+ desc = ext4_get_group_desc (sb, group, &bh);
+ if (!desc || !desc->bg_free_inodes_count)
+ continue;
+ if (le16_to_cpu(desc->bg_free_inodes_count) >= avefreei)
+ return group;
+ }
+
+ if (avefreei) {
+ /*
+ * The free-inodes counter is approximate, and for really small
+ * filesystems the above test can fail to find any blockgroups
+ */
+ avefreei = 0;
+ goto fallback;
+ }
+
+ return -1;
+}
+
+static int find_group_other(struct super_block *sb, struct inode *parent)
+{
+ int parent_group = EXT4_I(parent)->i_block_group;
+ int ngroups = EXT4_SB(sb)->s_groups_count;
+ struct ext4_group_desc *desc;
+ struct buffer_head *bh;
+ int group, i;
+
+ /*
+ * Try to place the inode in its parent directory
+ */
+ group = parent_group;
+ desc = ext4_get_group_desc (sb, group, &bh);
+ if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
+ le16_to_cpu(desc->bg_free_blocks_count))
+ return group;
+
+ /*
+ * We're going to place this inode in a different blockgroup from its
+ * parent. We want to cause files in a common directory to all land in
+ * the same blockgroup. But we want files which are in a different
+ * directory which shares a blockgroup with our parent to land in a
+ * different blockgroup.
+ *
+ * So add our directory's i_ino into the starting point for the hash.
+ */
+ group = (group + parent->i_ino) % ngroups;
+
+ /*
+ * Use a quadratic hash to find a group with a free inode and some free
+ * blocks.
+ */
+ for (i = 1; i < ngroups; i <<= 1) {
+ group += i;
+ if (group >= ngroups)
+ group -= ngroups;
+ desc = ext4_get_group_desc (sb, group, &bh);
+ if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
+ le16_to_cpu(desc->bg_free_blocks_count))
+ return group;
+ }
+
+ /*
+ * That failed: try linear search for a free inode, even if that group
+ * has no free blocks.
+ */
+ group = parent_group;
+ for (i = 0; i < ngroups; i++) {
+ if (++group >= ngroups)
+ group = 0;
+ desc = ext4_get_group_desc (sb, group, &bh);
+ if (desc && le16_to_cpu(desc->bg_free_inodes_count))
+ return group;
+ }
+
+ return -1;
+}
+
+/*
+ * There are two policies for allocating an inode. If the new inode is
+ * a directory, then a forward search is made for a block group with both
+ * free space and a low directory-to-inode ratio; if that fails, then of
+ * the groups with above-average free space, that group with the fewest
+ * directories already is chosen.
+ *
+ * For other inodes, search forward from the parent directory's block
+ * group to find a free inode.
+ */
+struct inode *ext4_new_inode(handle_t *handle, struct inode * dir, int mode)
+{
+ struct super_block *sb;
+ struct buffer_head *bitmap_bh = NULL;
+ struct buffer_head *bh2;
+ int group;
+ unsigned long ino = 0;
+ struct inode * inode;
+ struct ext4_group_desc * gdp = NULL;
+ struct ext4_super_block * es;
+ struct ext4_inode_info *ei;
+ struct ext4_sb_info *sbi;
+ int err = 0;
+ struct inode *ret;
+ int i;
+
+ /* Cannot create files in a deleted directory */
+ if (!dir || !dir->i_nlink)
+ return ERR_PTR(-EPERM);
+
+ sb = dir->i_sb;
+ inode = new_inode(sb);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+
+ inode->i_tag = dx_current_fstag(sb);
+ if (DLIMIT_ALLOC_INODE(inode)) {
+ err = -ENOSPC;
+ goto out_dlimit;
+ }
+ ei = EXT4_I(inode);
+
+ sbi = EXT4_SB(sb);
+ es = sbi->s_es;
+ if (S_ISDIR(mode)) {
+ if (test_opt (sb, OLDALLOC))
+ group = find_group_dir(sb, dir);
+ else
+ group = find_group_orlov(sb, dir);
+ } else
+ group = find_group_other(sb, dir);
+
+ err = -ENOSPC;
+ if (group == -1)
+ goto out;
+
+ for (i = 0; i < sbi->s_groups_count; i++) {
+ err = -EIO;
+
+ gdp = ext4_get_group_desc(sb, group, &bh2);
+ if (!gdp)
+ goto fail;
+
+ brelse(bitmap_bh);
+ bitmap_bh = read_inode_bitmap(sb, group);
+ if (!bitmap_bh)
+ goto fail;
+
+ ino = 0;
+
+repeat_in_this_group:
+ ino = ext4_find_next_zero_bit((unsigned long *)
+ bitmap_bh->b_data, EXT4_INODES_PER_GROUP(sb), ino);
+ if (ino < EXT4_INODES_PER_GROUP(sb)) {
+
+ BUFFER_TRACE(bitmap_bh, "get_write_access");
+ err = ext4_journal_get_write_access(handle, bitmap_bh);
+ if (err)
+ goto fail;
+
+ if (!ext4_set_bit_atomic(sb_bgl_lock(sbi, group),
+ ino, bitmap_bh->b_data)) {
+ /* we won it */
+ BUFFER_TRACE(bitmap_bh,
+ "call ext4_journal_dirty_metadata");
+ err = ext4_journal_dirty_metadata(handle,
+ bitmap_bh);
+ if (err)
+ goto fail;
+ goto got;
+ }
+ /* we lost it */
+ jbd2_journal_release_buffer(handle, bitmap_bh);
+
+ if (++ino < EXT4_INODES_PER_GROUP(sb))
+ goto repeat_in_this_group;
+ }
+
+ /*
+ * This case is possible in concurrent environment. It is very
+ * rare. We cannot repeat the find_group_xxx() call because
+ * that will simply return the same blockgroup, because the
+ * group descriptor metadata has not yet been updated.
+ * So we just go onto the next blockgroup.
+ */
+ if (++group == sbi->s_groups_count)
+ group = 0;
+ }
+ err = -ENOSPC;
+ goto out;
+
+got:
+ ino += group * EXT4_INODES_PER_GROUP(sb) + 1;
+ if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
+ ext4_error (sb, "ext4_new_inode",
+ "reserved inode or inode > inodes count - "
+ "block_group = %d, inode=%lu", group, ino);
+ err = -EIO;
+ goto fail;
+ }
+
+ BUFFER_TRACE(bh2, "get_write_access");
+ err = ext4_journal_get_write_access(handle, bh2);
+ if (err) goto fail;
+ spin_lock(sb_bgl_lock(sbi, group));
+ gdp->bg_free_inodes_count =
+ cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) - 1);
+ if (S_ISDIR(mode)) {
+ gdp->bg_used_dirs_count =
+ cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) + 1);
+ }
+ spin_unlock(sb_bgl_lock(sbi, group));
+ BUFFER_TRACE(bh2, "call ext4_journal_dirty_metadata");
+ err = ext4_journal_dirty_metadata(handle, bh2);
+ if (err) goto fail;
+
+ percpu_counter_dec(&sbi->s_freeinodes_counter);
+ if (S_ISDIR(mode))
+ percpu_counter_inc(&sbi->s_dirs_counter);
+ sb->s_dirt = 1;
+
+ inode->i_uid = current->fsuid;
+ if (test_opt (sb, GRPID))
+ inode->i_gid = dir->i_gid;
+ else if (dir->i_mode & S_ISGID) {
+ inode->i_gid = dir->i_gid;
+ if (S_ISDIR(mode))
+ mode |= S_ISGID;
+ } else
+ inode->i_gid = current->fsgid;
+ inode->i_mode = mode;
+
+ inode->i_ino = ino;
+ /* This is the optimal IO size (for stat), not the fs block size */
+ inode->i_blocks = 0;
+ inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
+
+ memset(ei->i_data, 0, sizeof(ei->i_data));
+ ei->i_dir_start_lookup = 0;
+ ei->i_disksize = 0;
+
+ ei->i_flags = EXT4_I(dir)->i_flags &
+ ~(EXT4_INDEX_FL|EXT4_IUNLINK_FL|EXT4_BARRIER_FL);
+ if (S_ISLNK(mode))
+ ei->i_flags &= ~(EXT4_IMMUTABLE_FL|EXT4_APPEND_FL);
+ /* dirsync only applies to directories */
+ if (!S_ISDIR(mode))
+ ei->i_flags &= ~EXT4_DIRSYNC_FL;
+#ifdef EXT4_FRAGMENTS
+ ei->i_faddr = 0;
+ ei->i_frag_no = 0;
+ ei->i_frag_size = 0;
+#endif
+ ei->i_file_acl = 0;
+ ei->i_dir_acl = 0;
+ ei->i_dtime = 0;
+ ei->i_block_alloc_info = NULL;
+ ei->i_block_group = group;
+
+ ext4_set_inode_flags(inode);
+ if (IS_DIRSYNC(inode))
+ handle->h_sync = 1;
+ insert_inode_hash(inode);
+ spin_lock(&sbi->s_next_gen_lock);
+ inode->i_generation = sbi->s_next_generation++;
+ spin_unlock(&sbi->s_next_gen_lock);
+
+ ei->i_state = EXT4_STATE_NEW;
+ ei->i_extra_isize =
+ (EXT4_INODE_SIZE(inode->i_sb) > EXT4_GOOD_OLD_INODE_SIZE) ?
+ sizeof(struct ext4_inode) - EXT4_GOOD_OLD_INODE_SIZE : 0;
+
+ ret = inode;
+ if(DQUOT_ALLOC_INODE(inode)) {
+ err = -EDQUOT;
+ goto fail_drop;
+ }
+
+ err = ext4_init_acl(handle, inode, dir);
+ if (err)
+ goto fail_free_drop;
+
+ err = ext4_init_security(handle,inode, dir);
+ if (err)
+ goto fail_free_drop;
+
+ err = ext4_mark_inode_dirty(handle, inode);
+ if (err) {
+ ext4_std_error(sb, err);
+ goto fail_free_drop;
+ }
+ if (test_opt(sb, EXTENTS)) {
+ EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL;
+ ext4_ext_tree_init(handle, inode);
+ if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
+ err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
+ if (err) goto fail;
+ EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS);
+ BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "call ext4_journal_dirty_metadata");
+ err = ext4_journal_dirty_metadata(handle, EXT4_SB(sb)->s_sbh);
+ }
+ }
+
+ ext4_debug("allocating inode %lu\n", inode->i_ino);
+ goto really_out;
+fail:
+ ext4_std_error(sb, err);
+out:
+ DLIMIT_FREE_INODE(inode);
+out_dlimit:
+ iput(inode);
+ ret = ERR_PTR(err);
+really_out:
+ brelse(bitmap_bh);
+ return ret;
+
+fail_free_drop:
+ DQUOT_FREE_INODE(inode);
+
+fail_drop:
+ DQUOT_DROP(inode);
+ DLIMIT_FREE_INODE(inode);
+ inode->i_flags |= S_NOQUOTA;
+ inode->i_nlink = 0;
+ iput(inode);
+ brelse(bitmap_bh);
+ return ERR_PTR(err);
+}
+
+/* Verify that we are loading a valid orphan from disk */
+struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
+{
+ unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count);
+ unsigned long block_group;
+ int bit;
+ struct buffer_head *bitmap_bh = NULL;
+ struct inode *inode = NULL;
+
+ /* Error cases - e2fsck has already cleaned up for us */
+ if (ino > max_ino) {
+ ext4_warning(sb, __FUNCTION__,
+ "bad orphan ino %lu! e2fsck was run?", ino);
+ goto out;
+ }
+
+ block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
+ bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb);
+ bitmap_bh = read_inode_bitmap(sb, block_group);
+ if (!bitmap_bh) {
+ ext4_warning(sb, __FUNCTION__,
+ "inode bitmap error for orphan %lu", ino);
+ goto out;
+ }
+
+ /* Having the inode bit set should be a 100% indicator that this
+ * is a valid orphan (no e2fsck run on fs). Orphans also include
+ * inodes that were being truncated, so we can't check i_nlink==0.
+ */
+ if (!ext4_test_bit(bit, bitmap_bh->b_data) ||
+ !(inode = iget(sb, ino)) || is_bad_inode(inode) ||
+ NEXT_ORPHAN(inode) > max_ino) {
+ ext4_warning(sb, __FUNCTION__,
+ "bad orphan inode %lu! e2fsck was run?", ino);
+ printk(KERN_NOTICE "ext4_test_bit(bit=%d, block=%llu) = %d\n",
+ bit, (unsigned long long)bitmap_bh->b_blocknr,
+ ext4_test_bit(bit, bitmap_bh->b_data));
+ printk(KERN_NOTICE "inode=%p\n", inode);
+ if (inode) {
+ printk(KERN_NOTICE "is_bad_inode(inode)=%d\n",
+ is_bad_inode(inode));
+ printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n",
+ NEXT_ORPHAN(inode));
+ printk(KERN_NOTICE "max_ino=%lu\n", max_ino);
+ }
+ /* Avoid freeing blocks if we got a bad deleted inode */
+ if (inode && inode->i_nlink == 0)
+ inode->i_blocks = 0;
+ iput(inode);
+ inode = NULL;
+ }
+out:
+ brelse(bitmap_bh);
+ return inode;
+}
+
+unsigned long ext4_count_free_inodes (struct super_block * sb)
+{
+ unsigned long desc_count;
+ struct ext4_group_desc *gdp;
+ int i;
+#ifdef EXT4FS_DEBUG
+ struct ext4_super_block *es;
+ unsigned long bitmap_count, x;
+ struct buffer_head *bitmap_bh = NULL;
+
+ es = EXT4_SB(sb)->s_es;
+ desc_count = 0;
+ bitmap_count = 0;
+ gdp = NULL;
+ for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) {
+ gdp = ext4_get_group_desc (sb, i, NULL);
+ if (!gdp)
+ continue;
+ desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
+ brelse(bitmap_bh);
+ bitmap_bh = read_inode_bitmap(sb, i);
+ if (!bitmap_bh)
+ continue;
+
+ x = ext4_count_free(bitmap_bh, EXT4_INODES_PER_GROUP(sb) / 8);
+ printk("group %d: stored = %d, counted = %lu\n",
+ i, le16_to_cpu(gdp->bg_free_inodes_count), x);
+ bitmap_count += x;
+ }
+ brelse(bitmap_bh);
+ printk("ext4_count_free_inodes: stored = %u, computed = %lu, %lu\n",
+ le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count);
+ return desc_count;
+#else
+ desc_count = 0;
+ for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) {
+ gdp = ext4_get_group_desc (sb, i, NULL);
+ if (!gdp)
+ continue;
+ desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
+ cond_resched();
+ }
+ return desc_count;
+#endif
+}
+
+/* Called at mount-time, super-block is locked */
+unsigned long ext4_count_dirs (struct super_block * sb)
+{
+ unsigned long count = 0;
+ int i;
+
+ for (i = 0; i < EXT4_SB(sb)->s_groups_count; i++) {
+ struct ext4_group_desc *gdp = ext4_get_group_desc (sb, i, NULL);
+ if (!gdp)
+ continue;
+ count += le16_to_cpu(gdp->bg_used_dirs_count);
+ }
+ return count;
+}
+
git://git.onelab.eu / linux-2.6.git / blobdiff