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fs: fat: add rename

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The implementation roughly follows the POSIX specification for
rename() [1]. The ordering of operations attempting to minimize the chance
for data loss in unexpected circumstances.

The 'mv' command was implemented as a front end for the rename operation
as that is what most users are likely familiar with in terms of behavior.

The 'FAT_RENAME' Kconfig option was added to prevent code size increase on
size-oriented builds like SPL.

[1] https://pubs.opengroup.org/onlinepubs/9799919799/functions/rename.html

Signed-off-by: Gabriel Dalimonte <gabriel.dalimonte@gmail.com>
This commit is contained in:
Gabriel Dalimonte 2025-02-17 13:26:44 -05:00 • committed by Tom Rini
parent d9c149664f
commit 06159a1465
11 changed files with 930 additions and 1 deletions
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include/fat.h
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@ -206,6 +206,7 @@ int fat_opendir(const char *filename, struct fs_dir_stream **dirsp);
int fat_readdir(struct fs_dir_stream *dirs, struct fs_dirent **dentp);
void fat_closedir(struct fs_dir_stream *dirs);
int fat_unlink(const char *filename);
int fat_rename(const char *old_path, const char *new_path);
int fat_mkdir(const char *dirname);
void fat_close(void);
void *fat_next_cluster(fat_itr *itr, unsigned int *nbytes);