Changeset e80c2ff in mainline for uspace/srv/fs/minixfs/mfs_dentry.c

Timestamp:

2011-07-06T19:56:57Z (14 years ago)

Author:

Maurizio Lombardi <m.lombardi85@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

b89281b

Parents:

70ac0af

Message:

The read_directory_entry() function has been rewritten to avoid dynamic memory allocation
of the d_info structure.

File:

• uspace/srv/fs/minixfs/mfs_dentry.c (modified) (11 diffs)

uspace/srv/fs/minixfs/mfs_dentry.c

@@ -36 +36 @@
 int
 read_directory_entry(struct mfs_node *mnode,
-                     struct mfs_dentry_info **d_info, unsigned index)
+                     struct mfs_dentry_info *d_info, unsigned index)
 {
         const struct mfs_instance *inst = mnode->instance;
@@ -44 +44 @@
         block_t *b;
 
-        *d_info = malloc(sizeof(**d_info));
-        if (!*d_info)
-                return ENOMEM;
-
         int r = read_map(&block, mnode, index * sbi->dirsize);
-        if (r != EOK)
-                goto out_err;
+        on_error(r, goto out_err);
 
         if (block == 0) {
@@ -59 +54 @@
 
         r = block_get(&b, inst->handle, block, BLOCK_FLAGS_NONE);
-        if (r != EOK)
-                goto out_err;
+        on_error(r, goto out_err);
 
         unsigned dentries_per_zone = sbi->block_size / sbi->dirsize;
@@ -70 +64 @@
                 d3 = b->data + (dentry_off * MFS3_DIRSIZE);
 
-                (*d_info)->d_inum = conv32(sbi->native, d3->d_inum);
-                memcpy((*d_info)->d_name, d3->d_name, MFS3_MAX_NAME_LEN);
+                d_info->d_inum = conv32(sbi->native, d3->d_inum);
+                memcpy(d_info->d_name, d3->d_name, MFS3_MAX_NAME_LEN);
         } else {
                 const int namelen = longnames ? MFS_L_MAX_NAME_LEN :
@@ -80 +74 @@
                 d = b->data + dentry_off * (longnames ? MFSL_DIRSIZE :
                                             MFS_DIRSIZE);
-                (*d_info)->d_inum = conv16(sbi->native, d->d_inum);
-                memcpy((*d_info)->d_name, d->d_name, namelen);
+                d_info->d_inum = conv16(sbi->native, d->d_inum);
+                memcpy(d_info->d_name, d->d_name, namelen);
         }
 
         block_put(b);
 
-        (*d_info)->index = index;
-        (*d_info)->node = mnode;
+        d_info->index = index;
+        d_info->node = mnode;
+
+out_err:
         return EOK;
-
-out_err:
-        free(*d_info);
-        *d_info = NULL;
-        return r;
 }
 
@@ -108 +99 @@
 
         r = read_map(&block, mnode, d_off_bytes);
-        if (r != EOK)
-                goto out;
+        on_error(r, goto out);
 
         r = block_get(&b, mnode->instance->handle, block, BLOCK_FLAGS_NONE);
-        if (r != EOK)
-                goto out;
+        on_error(r, goto out);
 
         const size_t name_len = sbi->max_name_len;
@@ -144 +133 @@
 {
         struct mfs_sb_info *sbi = mnode->instance->sbi;
-        struct mfs_dentry_info *d_info;
-        int i, r;
+        struct mfs_dentry_info d_info;
+        int r;
 
         const size_t name_len = str_size(d_name);
@@ -153 +142 @@
 
         /*Search the directory entry to be removed*/
-        for (i = 0; ; ++i) {
+        unsigned i;
+        for (i = 0; i < mnode->ino_i->i_size / sbi->dirsize ; ++i) {
                 r = read_directory_entry(mnode, &d_info, i);
                 on_error(r, return r);
 
-                if (!d_info) {
-                        /*Reached the end of the dentries list*/
-                        break;
-                }
-
-                if (!bcmp(d_info->d_name, d_name, name_len)) {
-                        d_info->d_inum = 0;
-                        r = write_dentry(d_info);
-                        free(d_info);
+                if (!bcmp(d_info.d_name, d_name, name_len)) {
+                        d_info.d_inum = 0;
+                        r = write_dentry(&d_info);
                         return r;
                 }
-                free(d_info);
         }
 
@@ -177 +160 @@
 insert_dentry(struct mfs_node *mnode, const char *d_name, fs_index_t d_inum)
 {
-        int i, r;
+        int r;
         struct mfs_sb_info *sbi = mnode->instance->sbi;
-        struct mfs_dentry_info *d_info;
+        struct mfs_dentry_info d_info;
         bool empty_dentry_found = false;
 
@@ -188 +171 @@
 
         /*Search for an empty dentry*/
-
-        for (i = 0; ; ++i) {
+        unsigned i;
+        for (i = 0; i < mnode->ino_i->i_size / sbi->dirsize; ++i) {
                 r = read_directory_entry(mnode, &d_info, i);
-                if (r != EOK)
-                        return r;
-
-                if (!d_info) {
-                        /*Reached the end of the dentries list*/
-                        break;
-                }
-
-                if (d_info->d_inum == 0) {
+                on_error(r, return r);
+
+                if (d_info.d_inum == 0) {
                         /*This entry is not used*/
                         empty_dentry_found = true;
                         break;
                 }
-                free(d_info);
         }
 
@@ -213 +189 @@
                 r = read_directory_entry(mnode, &d_info, i);
                 on_error(r, goto out);
-
-                assert(d_info != NULL);
-        }
-
-        d_info->d_inum = d_inum;
-        memcpy(d_info->d_name, d_name, name_len);
-        d_info->d_name[name_len] = 0;
-
-        r = write_dentry(d_info);
-        free(d_info);
+        }
+
+        d_info.d_inum = d_inum;
+        memcpy(d_info.d_name, d_name, name_len);
+        d_info.d_name[name_len] = 0;
+
+        r = write_dentry(&d_info);
 out:
         return r;