diff options
| author | Stefan Brüns <stefan.bruens@rwth-aachen.de> | 2016-11-06 18:33:57 +0100 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2016-11-21 14:07:27 -0500 |
| commit | 66a47ff2d8f037e1e9d641623257894a9975c325 (patch) | |
| tree | e88226f6c864e3916648c4ce09ccd0af9b194a37 /fs/ext4 | |
| parent | f81db56f2fd6dc16efeaec2961121244765a1f11 (diff) | |
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>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/ext4fs.c | 17 |
1 files changed, 6 insertions, 11 deletions
diff --git a/fs/ext4/ext4fs.c b/fs/ext4/ext4fs.c index 3078737770..7187dcfb05 100644 --- a/fs/ext4/ext4fs.c +++ b/fs/ext4/ext4fs.c @@ -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) |