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author | Wu, Josh <Josh.wu@atmel.com> | 2014-05-08 16:14:07 +0800 |
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committer | Tom Rini <trini@ti.com> | 2014-05-12 16:31:51 -0400 |
commit | dd6d7967dfa88bd51062a8afb004962d16006ecd (patch) | |
tree | ecfe8eb5205642f8eb65d6d623575f5769f1469a /board/pxa255_idp | |
parent | 2e98f70882f8c1a09b662137884c1435a97c9a1c (diff) | |
download | u-boot-imx-dd6d7967dfa88bd51062a8afb004962d16006ecd.zip u-boot-imx-dd6d7967dfa88bd51062a8afb004962d16006ecd.tar.gz u-boot-imx-dd6d7967dfa88bd51062a8afb004962d16006ecd.tar.bz2 |
fs/fat: correct FAT16/12 file finding in root dir
When write a file into FAT file system, it will search a match file in
root dir. So the find_directory_entry() will get the first cluster of
root dir content and search the directory item one by one. If the file
is not found, we will call get_fatent_value() to get next cluster of root
dir via lookup the FAT table and continue the search.
The issue is in FAT16/12 system, we cannot get root dir's next clust
from FAT table. The FAT table only be use to find the clust of data
aera in FAT16/12.
In FAT16/12 if the clust is in root dir, the clust number is a negative
number or 0, 1. Since root dir is located in front of the data area.
Data area start clust #2. So the root dir clust number should < 2.
This patch will check above situation before call get_fatenv_value().
If curclust is < 2, include minus number, we just increase one on the
curclust since root dir is in continous cluster.
The patch also add a sanity check for entry in get_fatenv_value().
Signed-off-by: Josh Wu <josh.wu@atmel.com>
Diffstat (limited to 'board/pxa255_idp')
0 files changed, 0 insertions, 0 deletions