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The disk_read() and disk_write() functions of the FAT driver use the
blk_dread() and blk_dwrite() respectively. The blk_* APIs read and write
to the devices in terms of the device block size. However, the FAT
driver reads in terms of the device block size (from fat_set_blk_dev and
read_bootsectandvi) and sector size in the rest of the places.
This causes buffer overflows or partial reads when the FAT sector size
is not equal to device block size. Fix this by using blk_dread in
fat_set_blk_dev and read_bootsectandvi instead of disk_read. And update
disk_read/disk_write to handle FAT sector size and block size mismatch.
Tested on
blksz | FAT sector size
------+----------------
4096 | 4096
512 | 512
4096 | 512
512 | 4096
Signed-off-by: Varadarajan Narayanan <[email protected]>
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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 <[email protected]>
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Signed-off-by: Tuomas Tynkkynen <[email protected]>
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Add Kconfig symbols for various configurations
supported by FAT filesystem support code.
CONFIG_SUPPORT_VFAT has been left out since its
force enabled in include/fat.h and probably
should get removed at some point.
Signed-off-by: Sekhar Nori <[email protected]>
[trini: add select FS_FAT for CMD_FAT and SPL_FAT_SUPPORT]
Signed-off-by: Tom Rini <[email protected]>
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This would be useful to start moving various config options.
Signed-off-by: Masahiro Yamada <[email protected]>
Acked-by: Simon Glass <[email protected]>
Tested-by: Simon Glass <[email protected]>
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