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-rw-r--r--exfat/libexfat/node.c218
1 files changed, 167 insertions, 51 deletions
diff --git a/exfat/libexfat/node.c b/exfat/libexfat/node.c
index f89b5731d..56205fced 100644
--- a/exfat/libexfat/node.c
+++ b/exfat/libexfat/node.c
@@ -2,11 +2,12 @@
node.c (09.10.09)
exFAT file system implementation library.
+ Free exFAT implementation.
Copyright (C) 2010-2013 Andrew Nayenko
- This program is free software: you can redistribute it and/or modify
+ This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
+ the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
@@ -14,8 +15,9 @@
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "exfat.h"
@@ -51,16 +53,18 @@ void exfat_put_node(struct exfat* ef, struct exfat_node* node)
if (node->references == 0)
{
- if (node->flags & EXFAT_ATTRIB_DIRTY)
- exfat_flush_node(ef, node);
+ /* FIXME handle I/O error */
+ if (exfat_flush_node(ef, node) != 0)
+ exfat_bug("node flush failed");
if (node->flags & EXFAT_ATTRIB_UNLINKED)
{
/* free all clusters and node structure itself */
exfat_truncate(ef, node, 0, true);
free(node);
}
- if (ef->cmap.dirty)
- exfat_flush_cmap(ef);
+ /* FIXME handle I/O error */
+ if (exfat_flush(ef) != 0)
+ exfat_bug("flush failed");
}
}
@@ -86,8 +90,12 @@ static int opendir(struct exfat* ef, const struct exfat_node* dir,
exfat_error("out of memory");
return -ENOMEM;
}
- exfat_pread(ef->dev, it->chunk, CLUSTER_SIZE(*ef->sb),
- exfat_c2o(ef, it->cluster));
+ if (exfat_pread(ef->dev, it->chunk, CLUSTER_SIZE(*ef->sb),
+ exfat_c2o(ef, it->cluster)) < 0)
+ {
+ exfat_error("failed to read directory cluster %#x", it->cluster);
+ return -EIO;
+ }
return 0;
}
@@ -119,8 +127,13 @@ static int fetch_next_entry(struct exfat* ef, const struct exfat_node* parent,
it->cluster);
return 1;
}
- exfat_pread(ef->dev, it->chunk, CLUSTER_SIZE(*ef->sb),
- exfat_c2o(ef, it->cluster));
+ if (exfat_pread(ef->dev, it->chunk, CLUSTER_SIZE(*ef->sb),
+ exfat_c2o(ef, it->cluster)) < 0)
+ {
+ exfat_error("failed to read the next directory cluster %#x",
+ it->cluster);
+ return 1;
+ }
}
return 0;
}
@@ -218,6 +231,12 @@ static int readdir(struct exfat* ef, const struct exfat_node* parent,
exfat_error("too few continuations (%hhu)", continuations);
goto error;
}
+ if (continuations > 1 +
+ DIV_ROUND_UP(EXFAT_NAME_MAX, EXFAT_ENAME_MAX))
+ {
+ exfat_error("too many continuations (%hhu)", continuations);
+ goto error;
+ }
reference_checksum = le16_to_cpu(meta1->checksum);
actual_checksum = exfat_start_checksum(meta1);
*node = allocate_node();
@@ -276,7 +295,10 @@ static int readdir(struct exfat* ef, const struct exfat_node* parent,
file_name = (const struct exfat_entry_name*) entry;
actual_checksum = exfat_add_checksum(entry, actual_checksum);
- memcpy(namep, file_name->name, EXFAT_ENAME_MAX * sizeof(le16_t));
+ memcpy(namep, file_name->name,
+ MIN(EXFAT_ENAME_MAX,
+ ((*node)->name + EXFAT_NAME_MAX - namep)) *
+ sizeof(le16_t));
namep += EXFAT_ENAME_MAX;
if (--continuations == 0)
{
@@ -344,8 +366,15 @@ static int readdir(struct exfat* ef, const struct exfat_node* parent,
}
ef->upcase_chars = le64_to_cpu(upcase->size) / sizeof(le16_t);
- exfat_pread(ef->dev, ef->upcase, le64_to_cpu(upcase->size),
- exfat_c2o(ef, le32_to_cpu(upcase->start_cluster)));
+ if (exfat_pread(ef->dev, ef->upcase, le64_to_cpu(upcase->size),
+ exfat_c2o(ef, le32_to_cpu(upcase->start_cluster))) < 0)
+ {
+ exfat_error("failed to read upper case table "
+ "(%"PRIu64" bytes starting at cluster %#x)",
+ le64_to_cpu(upcase->size),
+ le32_to_cpu(upcase->start_cluster));
+ goto error;
+ }
break;
case EXFAT_ENTRY_BITMAP:
@@ -359,16 +388,17 @@ static int readdir(struct exfat* ef, const struct exfat_node* parent,
}
ef->cmap.size = le32_to_cpu(ef->sb->cluster_count) -
EXFAT_FIRST_DATA_CLUSTER;
- if (le64_to_cpu(bitmap->size) < (ef->cmap.size + 7) / 8)
+ if (le64_to_cpu(bitmap->size) < DIV_ROUND_UP(ef->cmap.size, 8))
{
exfat_error("invalid clusters bitmap size: %"PRIu64
" (expected at least %u)",
- le64_to_cpu(bitmap->size), (ef->cmap.size + 7) / 8);
+ le64_to_cpu(bitmap->size),
+ DIV_ROUND_UP(ef->cmap.size, 8));
goto error;
}
/* FIXME bitmap can be rather big, up to 512 MB */
ef->cmap.chunk_size = ef->cmap.size;
- ef->cmap.chunk = malloc(le64_to_cpu(bitmap->size));
+ ef->cmap.chunk = malloc(BMAP_SIZE(ef->cmap.chunk_size));
if (ef->cmap.chunk == NULL)
{
exfat_error("failed to allocate clusters bitmap chunk "
@@ -377,8 +407,15 @@ static int readdir(struct exfat* ef, const struct exfat_node* parent,
goto error;
}
- exfat_pread(ef->dev, ef->cmap.chunk, le64_to_cpu(bitmap->size),
- exfat_c2o(ef, ef->cmap.start_cluster));
+ if (exfat_pread(ef->dev, ef->cmap.chunk,
+ BMAP_SIZE(ef->cmap.chunk_size),
+ exfat_c2o(ef, ef->cmap.start_cluster)) < 0)
+ {
+ exfat_error("failed to read clusters bitmap "
+ "(%"PRIu64" bytes starting at cluster %#x)",
+ le64_to_cpu(bitmap->size), ef->cmap.start_cluster);
+ goto error;
+ }
break;
case EXFAT_ENTRY_LABEL:
@@ -516,7 +553,7 @@ static void next_entry(struct exfat* ef, const struct exfat_node* parent,
*cluster = exfat_next_cluster(ef, parent, *cluster);
}
-void exfat_flush_node(struct exfat* ef, struct exfat_node* node)
+int exfat_flush_node(struct exfat* ef, struct exfat_node* node)
{
cluster_t cluster;
off64_t offset;
@@ -524,11 +561,14 @@ void exfat_flush_node(struct exfat* ef, struct exfat_node* node)
struct exfat_entry_meta1 meta1;
struct exfat_entry_meta2 meta2;
+ if (!(node->flags & EXFAT_ATTRIB_DIRTY))
+ return 0; /* no need to flush */
+
if (ef->ro)
exfat_bug("unable to flush node to read-only FS");
if (node->parent == NULL)
- return; /* do not flush unlinked node */
+ return 0; /* do not flush unlinked node */
cluster = node->entry_cluster;
offset = node->entry_offset;
@@ -536,14 +576,22 @@ void exfat_flush_node(struct exfat* ef, struct exfat_node* node)
next_entry(ef, node->parent, &cluster, &offset);
meta2_offset = co2o(ef, cluster, offset);
- exfat_pread(ef->dev, &meta1, sizeof(meta1), meta1_offset);
+ if (exfat_pread(ef->dev, &meta1, sizeof(meta1), meta1_offset) < 0)
+ {
+ exfat_error("failed to read meta1 entry on flush");
+ return -EIO;
+ }
if (meta1.type != EXFAT_ENTRY_FILE)
exfat_bug("invalid type of meta1: 0x%hhx", meta1.type);
meta1.attrib = cpu_to_le16(node->flags);
exfat_unix2exfat(node->mtime, &meta1.mdate, &meta1.mtime, &meta1.mtime_cs);
exfat_unix2exfat(node->atime, &meta1.adate, &meta1.atime, NULL);
- exfat_pread(ef->dev, &meta2, sizeof(meta2), meta2_offset);
+ if (exfat_pread(ef->dev, &meta2, sizeof(meta2), meta2_offset) < 0)
+ {
+ exfat_error("failed to read meta2 entry on flush");
+ return -EIO;
+ }
if (meta2.type != EXFAT_ENTRY_FILE_INFO)
exfat_bug("invalid type of meta2: 0x%hhx", meta2.type);
meta2.size = meta2.real_size = cpu_to_le64(node->size);
@@ -556,13 +604,22 @@ void exfat_flush_node(struct exfat* ef, struct exfat_node* node)
meta1.checksum = exfat_calc_checksum(&meta1, &meta2, node->name);
- exfat_pwrite(ef->dev, &meta1, sizeof(meta1), meta1_offset);
- exfat_pwrite(ef->dev, &meta2, sizeof(meta2), meta2_offset);
+ if (exfat_pwrite(ef->dev, &meta1, sizeof(meta1), meta1_offset) < 0)
+ {
+ exfat_error("failed to write meta1 entry on flush");
+ return -EIO;
+ }
+ if (exfat_pwrite(ef->dev, &meta2, sizeof(meta2), meta2_offset) < 0)
+ {
+ exfat_error("failed to write meta2 entry on flush");
+ return -EIO;
+ }
node->flags &= ~EXFAT_ATTRIB_DIRTY;
+ return 0;
}
-static void erase_entry(struct exfat* ef, struct exfat_node* node)
+static bool erase_entry(struct exfat* ef, struct exfat_node* node)
{
cluster_t cluster = node->entry_cluster;
off64_t offset = node->entry_offset;
@@ -570,18 +627,32 @@ static void erase_entry(struct exfat* ef, struct exfat_node* node)
uint8_t entry_type;
entry_type = EXFAT_ENTRY_FILE & ~EXFAT_ENTRY_VALID;
- exfat_pwrite(ef->dev, &entry_type, 1, co2o(ef, cluster, offset));
+ if (exfat_pwrite(ef->dev, &entry_type, 1, co2o(ef, cluster, offset)) < 0)
+ {
+ exfat_error("failed to erase meta1 entry");
+ return false;
+ }
next_entry(ef, node->parent, &cluster, &offset);
entry_type = EXFAT_ENTRY_FILE_INFO & ~EXFAT_ENTRY_VALID;
- exfat_pwrite(ef->dev, &entry_type, 1, co2o(ef, cluster, offset));
+ if (exfat_pwrite(ef->dev, &entry_type, 1, co2o(ef, cluster, offset)) < 0)
+ {
+ exfat_error("failed to erase meta2 entry");
+ return false;
+ }
while (name_entries--)
{
next_entry(ef, node->parent, &cluster, &offset);
entry_type = EXFAT_ENTRY_FILE_NAME & ~EXFAT_ENTRY_VALID;
- exfat_pwrite(ef->dev, &entry_type, 1, co2o(ef, cluster, offset));
+ if (exfat_pwrite(ef->dev, &entry_type, 1,
+ co2o(ef, cluster, offset)) < 0)
+ {
+ exfat_error("failed to erase name entry");
+ return false;
+ }
}
+ return true;
}
static int shrink_directory(struct exfat* ef, struct exfat_node* dir,
@@ -640,7 +711,11 @@ static int delete(struct exfat* ef, struct exfat_node* node)
int rc;
exfat_get_node(parent);
- erase_entry(ef, node);
+ if (!erase_entry(ef, node))
+ {
+ exfat_put_node(ef, parent);
+ return -EIO;
+ }
exfat_update_mtime(parent);
tree_detach(node);
rc = shrink_directory(ef, parent, deleted_offset);
@@ -757,17 +832,32 @@ static int write_entry(struct exfat* ef, struct exfat_node* dir,
meta1.checksum = exfat_calc_checksum(&meta1, &meta2, node->name);
- exfat_pwrite(ef->dev, &meta1, sizeof(meta1), co2o(ef, cluster, offset));
+ if (exfat_pwrite(ef->dev, &meta1, sizeof(meta1),
+ co2o(ef, cluster, offset)) < 0)
+ {
+ exfat_error("failed to write meta1 entry");
+ return -EIO;
+ }
next_entry(ef, dir, &cluster, &offset);
- exfat_pwrite(ef->dev, &meta2, sizeof(meta2), co2o(ef, cluster, offset));
+ if (exfat_pwrite(ef->dev, &meta2, sizeof(meta2),
+ co2o(ef, cluster, offset)) < 0)
+ {
+ exfat_error("failed to write meta2 entry");
+ return -EIO;
+ }
for (i = 0; i < name_entries; i++)
{
struct exfat_entry_name name_entry = {EXFAT_ENTRY_FILE_NAME, 0};
memcpy(name_entry.name, node->name + i * EXFAT_ENAME_MAX,
- EXFAT_ENAME_MAX * sizeof(le16_t));
+ MIN(EXFAT_ENAME_MAX, EXFAT_NAME_MAX - i * EXFAT_ENAME_MAX) *
+ sizeof(le16_t));
next_entry(ef, dir, &cluster, &offset);
- exfat_pwrite(ef->dev, &name_entry, sizeof(name_entry),
- co2o(ef, cluster, offset));
+ if (exfat_pwrite(ef->dev, &name_entry, sizeof(name_entry),
+ co2o(ef, cluster, offset)) < 0)
+ {
+ exfat_error("failed to write name entry");
+ return -EIO;
+ }
}
init_node_meta1(node, &meta1);
@@ -837,7 +927,7 @@ int exfat_mkdir(struct exfat* ef, const char* path)
return 0;
}
-static void rename_entry(struct exfat* ef, struct exfat_node* dir,
+static int rename_entry(struct exfat* ef, struct exfat_node* dir,
struct exfat_node* node, const le16_t* name, cluster_t new_cluster,
off64_t new_offset)
{
@@ -849,26 +939,43 @@ static void rename_entry(struct exfat* ef, struct exfat_node* dir,
const int name_entries = DIV_ROUND_UP(name_length, EXFAT_ENAME_MAX);
int i;
- exfat_pread(ef->dev, &meta1, sizeof(meta1),
- co2o(ef, old_cluster, old_offset));
+ if (exfat_pread(ef->dev, &meta1, sizeof(meta1),
+ co2o(ef, old_cluster, old_offset)) < 0)
+ {
+ exfat_error("failed to read meta1 entry on rename");
+ return -EIO;
+ }
next_entry(ef, node->parent, &old_cluster, &old_offset);
- exfat_pread(ef->dev, &meta2, sizeof(meta2),
- co2o(ef, old_cluster, old_offset));
+ if (exfat_pread(ef->dev, &meta2, sizeof(meta2),
+ co2o(ef, old_cluster, old_offset)) < 0)
+ {
+ exfat_error("failed to read meta2 entry on rename");
+ return -EIO;
+ }
meta1.continuations = 1 + name_entries;
meta2.name_hash = exfat_calc_name_hash(ef, name);
meta2.name_length = name_length;
meta1.checksum = exfat_calc_checksum(&meta1, &meta2, name);
- erase_entry(ef, node);
+ if (!erase_entry(ef, node))
+ return -EIO;
node->entry_cluster = new_cluster;
node->entry_offset = new_offset;
- exfat_pwrite(ef->dev, &meta1, sizeof(meta1),
- co2o(ef, new_cluster, new_offset));
+ if (exfat_pwrite(ef->dev, &meta1, sizeof(meta1),
+ co2o(ef, new_cluster, new_offset)) < 0)
+ {
+ exfat_error("failed to write meta1 entry on rename");
+ return -EIO;
+ }
next_entry(ef, dir, &new_cluster, &new_offset);
- exfat_pwrite(ef->dev, &meta2, sizeof(meta2),
- co2o(ef, new_cluster, new_offset));
+ if (exfat_pwrite(ef->dev, &meta2, sizeof(meta2),
+ co2o(ef, new_cluster, new_offset)) < 0)
+ {
+ exfat_error("failed to write meta2 entry on rename");
+ return -EIO;
+ }
for (i = 0; i < name_entries; i++)
{
@@ -876,13 +983,18 @@ static void rename_entry(struct exfat* ef, struct exfat_node* dir,
memcpy(name_entry.name, name + i * EXFAT_ENAME_MAX,
EXFAT_ENAME_MAX * sizeof(le16_t));
next_entry(ef, dir, &new_cluster, &new_offset);
- exfat_pwrite(ef->dev, &name_entry, sizeof(name_entry),
- co2o(ef, new_cluster, new_offset));
+ if (exfat_pwrite(ef->dev, &name_entry, sizeof(name_entry),
+ co2o(ef, new_cluster, new_offset)) < 0)
+ {
+ exfat_error("failed to write name entry on rename");
+ return -EIO;
+ }
}
memcpy(node->name, name, (EXFAT_NAME_MAX + 1) * sizeof(le16_t));
tree_detach(node);
tree_attach(dir, node);
+ return 0;
}
int exfat_rename(struct exfat* ef, const char* old_path, const char* new_path)
@@ -961,7 +1073,7 @@ int exfat_rename(struct exfat* ef, const char* old_path, const char* new_path)
exfat_put_node(ef, node);
return rc;
}
- rename_entry(ef, dir, node, name, cluster, offset);
+ rc = rename_entry(ef, dir, node, name, cluster, offset);
exfat_put_node(ef, dir);
exfat_put_node(ef, node);
return 0;
@@ -1049,8 +1161,12 @@ int exfat_set_label(struct exfat* ef, const char* label)
if (entry.length == 0)
entry.type ^= EXFAT_ENTRY_VALID;
- exfat_pwrite(ef->dev, &entry, sizeof(struct exfat_entry_label),
- co2o(ef, cluster, offset));
+ if (exfat_pwrite(ef->dev, &entry, sizeof(struct exfat_entry_label),
+ co2o(ef, cluster, offset)) < 0)
+ {
+ exfat_error("failed to write label entry");
+ return -EIO;
+ }
strcpy(ef->label, label);
return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-05 21:20:48 +0100