diff mbox series

[v3,2/6] vvfat: Fix usage of `info.file.offset`

Message ID 836a0ea26f641a4f0ff4b2bd8e9c9d17c59ef2d7.1716717181.git.amjadsharafi10@gmail.com
State New
Headers show
Series vvfat: Fix write bugs for large files and add iotests | expand

Commit Message

Amjad Alsharafi May 26, 2024, 9:56 a.m. UTC 
The field is marked as "the offset in the file (in clusters)", but it
was being used like this
`cluster_size*(nums)+mapping->info.file.offset`, which is incorrect.

Additionally, removed the `abort` when `first_mapping_index` does not
match, as this matches the case when adding new clusters for files, and
its inevitable that we reach this condition when doing that if the
clusters are not after one another, so there is no reason to `abort`
here, execution continues and the new clusters are written to disk
correctly.

Signed-off-by: Amjad Alsharafi <amjadsharafi10@gmail.com>
---
 block/vvfat.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/block/vvfat.c b/block/vvfat.c
index ab342f0743..cb3ab81e29 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -1408,7 +1408,7 @@  read_cluster_directory:
 
         assert(s->current_fd);
 
-        offset=s->cluster_size*(cluster_num-s->current_mapping->begin)+s->current_mapping->info.file.offset;
+        offset=s->cluster_size*((cluster_num - s->current_mapping->begin) + s->current_mapping->info.file.offset);
         if(lseek(s->current_fd, offset, SEEK_SET)!=offset)
             return -3;
         s->cluster=s->cluster_buffer;
@@ -1929,8 +1929,8 @@  get_cluster_count_for_direntry(BDRVVVFATState* s, direntry_t* direntry, const ch
                         (mapping->mode & MODE_DIRECTORY) == 0) {
 
                     /* was modified in qcow */
-                    if (offset != mapping->info.file.offset + s->cluster_size
-                            * (cluster_num - mapping->begin)) {
+                    if (offset != s->cluster_size
+                            * ((cluster_num - mapping->begin) + mapping->info.file.offset)) {
                         /* offset of this cluster in file chain has changed */
                         abort();
                         copy_it = 1;
@@ -1944,7 +1944,6 @@  get_cluster_count_for_direntry(BDRVVVFATState* s, direntry_t* direntry, const ch
 
                     if (mapping->first_mapping_index != first_mapping_index
                             && mapping->info.file.offset > 0) {
-                        abort();
                         copy_it = 1;
                     }
 
@@ -2404,7 +2403,7 @@  static int commit_mappings(BDRVVVFATState* s,
                         (mapping->end - mapping->begin);
             } else
                 next_mapping->info.file.offset = mapping->info.file.offset +
-                        mapping->end - mapping->begin;
+                        (mapping->end - mapping->begin);
 
             mapping = next_mapping;
         }