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Do not rewrite the root directory if it has not changed

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vau 2020-05-31 16:48:53 +03:00 committed by patacongo
parent 18e4ab99cb
commit 20615a9f65
1 changed files with 13 additions and 1 deletions
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14
fs/fat/fs_fat32.c
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@ -1394,6 +1394,8 @@ static int fat_sync(FAR struct file *filep)
if ((ff->ff_bflags & FFBUFF_MODIFIED) != 0) if ((ff->ff_bflags & FFBUFF_MODIFIED) != 0)
{ {
uint8_t dircopy[DIR_SIZE];
/* Flush any unwritten data in the file buffer */ /* Flush any unwritten data in the file buffer */
ret = fat_ffcacheflush(fs, ff); ret = fat_ffcacheflush(fs, ff);
@ -1419,6 +1421,10 @@ static int fat_sync(FAR struct file *filep)
direntry = &fs->fs_buffer[(ff->ff_dirindex & DIRSEC_NDXMASK(fs)) * direntry = &fs->fs_buffer[(ff->ff_dirindex & DIRSEC_NDXMASK(fs)) *
DIR_SIZE]; DIR_SIZE];
/* Copy directory entry */
memcpy(dircopy, direntry, DIR_SIZE);
/* Set the archive bit, set the write time, and update /* Set the archive bit, set the write time, and update
* anything that may have* changed in the directory * anything that may have* changed in the directory
* entry: the file size, and the start cluster * entry: the file size, and the start cluster
@ -1438,11 +1444,17 @@ static int fat_sync(FAR struct file *filep)
ff->ff_bflags &= ~FFBUFF_MODIFIED; ff->ff_bflags &= ~FFBUFF_MODIFIED;
/* Compare old and new directory entry */
if (memcmp(direntry, dircopy, DIR_SIZE) != 0)
{
fs->fs_dirty = true;
}
/* Flush these change to disk and update FSINFO (if /* Flush these change to disk and update FSINFO (if
* appropriate. * appropriate.
*/ */
fs->fs_dirty = true;
ret = fat_updatefsinfo(fs); ret = fat_updatefsinfo(fs);
} }