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fs: fat: reuse deleted directory entries

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When creating new directory entries try to reuse entries marked as deleted.

In fill_dir_slot() do not allocate new clusters as this has already been
done in fat_find_empty_dentries().

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2020-11-22 11:54:22 +01:00
parent 32a5f887c4
commit 3049a5106c
1 changed files with 22 additions and 12 deletions
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34
fs/fat/fat_write.c
View file

@ -258,7 +258,7 @@ static int flush_dirty_fat_buffer(fsdata *mydata)
* @count: number of directory entries to find
* Return: 0 on success or negative error number
*/
static int __maybe_unused fat_find_empty_dentries(fat_itr *itr, int count)
static int fat_find_empty_dentries(fat_itr *itr, int count)
{
unsigned int cluster;
dir_entry *dent;
@ -421,11 +421,9 @@ fill_dir_slot(fat_itr *itr, const char *l_name, const char *shortname)
if (itr->remaining == 0)
flush_dir(itr);
/* allocate a cluster for more entries */
if (!next_dent(itr) && !itr->dent)
if ((itr->is_root && itr->fsdata->fatsize != 32) ||
new_dir_table(itr))
return -EIO;
next_dent(itr);
if (!itr->dent)
return -EIO;
}
return 0;
@ -1339,6 +1337,7 @@ int file_fat_write_at(const char *filename, loff_t pos, void *buffer,
} else {
/* Create a new file */
char shortname[SHORT_NAME_SIZE];
int ndent;
if (itr->is_root) {
/* root dir cannot have "." or ".." */
@ -1362,10 +1361,15 @@ int file_fat_write_at(const char *filename, loff_t pos, void *buffer,
}
/* Check if long name is needed */
ret = set_name(itr, filename, shortname);
if (ret < 0)
ndent = set_name(itr, filename, shortname);
if (ndent < 0) {
ret = ndent;
goto exit;
if (ret > 1) {
}
ret = fat_find_empty_dentries(itr, ndent);
if (ret)
goto exit;
if (ndent > 1) {
/* Set long name entries */
ret = fill_dir_slot(itr, filename, shortname);
if (ret)
@ -1607,6 +1611,7 @@ int fat_mkdir(const char *new_dirname)
goto exit;
} else {
char shortname[SHORT_NAME_SIZE];
int ndent;
if (itr->is_root) {
/* root dir cannot have "." or ".." */
@ -1624,10 +1629,15 @@ int fat_mkdir(const char *new_dirname)
}
/* Check if long name is needed */
ret = set_name(itr, dirname, shortname);
if (ret < 0)
ndent = set_name(itr, dirname, shortname);
if (ndent < 0) {
ret = ndent;
goto exit;
if (ret > 1) {
}
ret = fat_find_empty_dentries(itr, ndent);
if (ret)
goto exit;
if (ndent > 1) {
/* Set long name entries */
ret = fill_dir_slot(itr, dirname, shortname);
if (ret)