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[FIX][DFSv2][ELMFAT]修复多线程环境下lseek返回值概率性被篡改的问题

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angryproton
2025-12-24 22:52:04 +08:00
committed by R b b666
parent 239f371fcb
commit ec0c2bbbd8
1 changed files with 3 additions and 2 deletions
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components/dfs/dfs_v2/filesystems/elmfat/dfs_elm.c
+3 -2
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@@ -629,7 +629,7 @@ int dfs_elm_flush(struct dfs_file *file)
off_t dfs_elm_lseek(struct dfs_file *file, off_t offset, int wherece) off_t dfs_elm_lseek(struct dfs_file *file, off_t offset, int wherece)
{ {
FRESULT result = FR_OK; FRESULT result = FR_OK;
off_t pos = 0;
switch (wherece) switch (wherece)
{ {
case SEEK_SET: case SEEK_SET:
@@ -656,11 +656,12 @@ off_t dfs_elm_lseek(struct dfs_file *file, off_t offset, int wherece)
RT_ASSERT(fd != RT_NULL); RT_ASSERT(fd != RT_NULL);
rt_mutex_take(&file->vnode->lock, RT_WAITING_FOREVER); rt_mutex_take(&file->vnode->lock, RT_WAITING_FOREVER);
result = f_lseek(fd, offset); result = f_lseek(fd, offset);
pos = fd->fptr;
rt_mutex_release(&file->vnode->lock); rt_mutex_release(&file->vnode->lock);
if (result == FR_OK) if (result == FR_OK)
{ {
/* return current position */ /* return current position */
return fd->fptr; return pos;
} }
} }
else if (file->vnode->type == FT_DIRECTORY) else if (file->vnode->type == FT_DIRECTORY)