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ext4: Allow reading files with non-zero offset, clamp read len 

Support was already implemented, but not hooked up. This fixes several
fails in the test cases.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
This commit is contained in:
Stefan Brüns 2016-11-06 18:33:57 +01:00 committed by Tom Rini
parent f81db56f2f
commit 66a47ff2d8
3 changed files with 11 additions and 16 deletions
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8
common/spl/spl_ext.c
View File

@ -42,7 +42,7 @@ int spl_load_image_ext(struct spl_image_info *spl_image,
puts("spl: ext4fs_open failed\n");
goto end;
}
err = ext4fs_read((char *)header, sizeof(struct image_header), &actlen);
err = ext4fs_read((char *)header, 0, sizeof(struct image_header), &actlen);
if (err < 0) {
puts("spl: ext4fs_read failed\n");
goto end;
@ -54,7 +54,7 @@ int spl_load_image_ext(struct spl_image_info *spl_image,
goto end;
}
err = ext4fs_read((char *)spl_image->load_addr, filelen, &actlen);
err = ext4fs_read((char *)spl_image->load_addr, 0, filelen, &actlen);
end:
#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
@ -97,7 +97,7 @@ int spl_load_image_ext_os(struct spl_image_info *spl_image,
puts("spl: ext4fs_open failed\n");
goto defaults;
}
err = ext4fs_read((void *)CONFIG_SYS_SPL_ARGS_ADDR, filelen, &actlen);
err = ext4fs_read((void *)CONFIG_SYS_SPL_ARGS_ADDR, 0, filelen, &actlen);
if (err < 0) {
printf("spl: error reading image %s, err - %d, falling back to default\n",
file, err);
@ -127,7 +127,7 @@ defaults:
if (err < 0)
puts("spl: ext4fs_open failed\n");
err = ext4fs_read((void *)CONFIG_SYS_SPL_ARGS_ADDR, filelen, &actlen);
err = ext4fs_read((void *)CONFIG_SYS_SPL_ARGS_ADDR, 0, filelen, &actlen);
if (err < 0) {
#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
printf("%s: error reading image %s, err - %d\n",

17
fs/ext4/ext4fs.c
View File

@ -65,8 +65,8 @@ int ext4fs_read_file(struct ext2fs_node *node, loff_t pos,
short status;
/* Adjust len so it we can't read past the end of the file. */
if (len > filesize)
len = filesize;
if (len + pos > filesize)
len = (filesize - pos);
blockcnt = lldiv(((len + pos) + blocksize - 1), blocksize);
@ -190,12 +190,12 @@ int ext4fs_size(const char *filename, loff_t *size)
return ext4fs_open(filename, size);
}
int ext4fs_read(char *buf, loff_t len, loff_t *actread)
int ext4fs_read(char *buf, loff_t offset, loff_t len, loff_t *actread)
{
if (ext4fs_root == NULL || ext4fs_file == NULL)
return 0;
return -1;
return ext4fs_read_file(ext4fs_file, 0, len, buf, actread);
return ext4fs_read_file(ext4fs_file, offset, len, buf, actread);
}
int ext4fs_probe(struct blk_desc *fs_dev_desc,
@ -217,11 +217,6 @@ int ext4_read_file(const char *filename, void *buf, loff_t offset, loff_t len,
loff_t file_len;
int ret;
if (offset != 0) {
printf("** Cannot support non-zero offset **\n");
return -1;
}
ret = ext4fs_open(filename, &file_len);
if (ret < 0) {
printf("** File not found %s **\n", filename);
@ -231,7 +226,7 @@ int ext4_read_file(const char *filename, void *buf, loff_t offset, loff_t len,
if (len == 0)
len = file_len;
return ext4fs_read(buf, len, len_read);
return ext4fs_read(buf, offset, len, len_read);
}
int ext4fs_uuid(char *uuid_str)

2
include/ext4fs.h
View File

@ -135,7 +135,7 @@ int ext4_write_file(const char *filename, void *buf, loff_t offset, loff_t len,
struct ext_filesystem *get_fs(void);
int ext4fs_open(const char *filename, loff_t *len);
int ext4fs_read(char *buf, loff_t len, loff_t *actread);
int ext4fs_read(char *buf, loff_t offset, loff_t len, loff_t *actread);
int ext4fs_mount(unsigned part_length);
void ext4fs_close(void);
void ext4fs_reinit_global(void);