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From 7a9929813cf912b424da18b8faa1320751baec2d Mon Sep 17 00:00:00 2001
From: Stephen Warren <swarren@nvidia.com>
Date: Thu, 23 Jan 2014 12:57:00 -0700
Subject: [PATCH 12/13] fat: implement exists() for FAT fs
This hooks into the generic "file exists" support added in an earlier
patch, and provides an implementation for the ext4 filesystem.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
fs/fat/fat.c | 18 ++++++++++++++----
fs/fs.c | 2 +-
include/fat.h | 1 +
3 files changed, 16 insertions(+), 5 deletions(-)
diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index b41d62e..bc06c0a 100644
--- a/fs/fat/fat.c
+++ b/fs/fat/fat.c
@@ -808,7 +808,7 @@ __u8 do_fat_read_at_block[MAX_CLUSTSIZE]
long
do_fat_read_at(const char *filename, unsigned long pos, void *buffer,
- unsigned long maxsize, int dols)
+ unsigned long maxsize, int dols, int dogetsize)
{
char fnamecopy[2048];
boot_sector bs;
@@ -1152,7 +1152,10 @@ rootdir_done:
subname = nextname;
}
- ret = get_contents(mydata, dentptr, pos, buffer, maxsize);
+ if (dogetsize)
+ ret = FAT2CPU32(dentptr->size);
+ else
+ ret = get_contents(mydata, dentptr, pos, buffer, maxsize);
debug("Size: %d, got: %ld\n", FAT2CPU32(dentptr->size), ret);
exit:
@@ -1163,7 +1166,7 @@ exit:
long
do_fat_read(const char *filename, void *buffer, unsigned long maxsize, int dols)
{
- return do_fat_read_at(filename, 0, buffer, maxsize, dols);
+ return do_fat_read_at(filename, 0, buffer, maxsize, dols, 0);
}
int file_fat_detectfs(void)
@@ -1233,11 +1236,18 @@ int file_fat_ls(const char *dir)
return do_fat_read(dir, NULL, 0, LS_YES);
}
+int fat_exists(const char *filename)
+{
+ int sz;
+ sz = do_fat_read_at(filename, 0, NULL, 0, LS_NO, 1);
+ return (sz >= 0) ? 0 : 1;
+}
+
long file_fat_read_at(const char *filename, unsigned long pos, void *buffer,
unsigned long maxsize)
{
printf("reading %s\n", filename);
- return do_fat_read_at(filename, pos, buffer, maxsize, LS_NO);
+ return do_fat_read_at(filename, pos, buffer, maxsize, LS_NO, 0);
}
long file_fat_read(const char *filename, void *buffer, unsigned long maxsize)
diff --git a/fs/fs.c b/fs/fs.c
index 3f14d01..d2bc8d0 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -80,7 +80,7 @@ static struct fstype_info fstypes[] = {
.probe = fat_set_blk_dev,
.close = fat_close,
.ls = file_fat_ls,
- .exists = fs_exists_unsupported,
+ .exists = fat_exists,
.read = fat_read_file,
.write = fs_write_unsupported,
},
diff --git a/include/fat.h b/include/fat.h
index 2c951e7..c8eb7cc 100644
--- a/include/fat.h
+++ b/include/fat.h
@@ -188,6 +188,7 @@ file_read_func file_fat_read;
int file_cd(const char *path);
int file_fat_detectfs(void);
int file_fat_ls(const char *dir);
+int fat_exists(const char *filename);
long file_fat_read_at(const char *filename, unsigned long pos, void *buffer,
unsigned long maxsize);
long file_fat_read(const char *filename, void *buffer, unsigned long maxsize);
--
1.8.5.3
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