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kobj_read_file: Return -1 on vn_rdwr() error

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I noticed that the SPL implementation of kobj_read_file is not correct
after comparing it with the userland implementation of kobj_read_file()
in zfsonlinux/zfs#4104.

Note that we no longer pass RLIM64_INFINITY with this, but our vn_rdwr
implementation did not support it anyway, so there is no difference.

Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #513
This commit is contained in:
Richard Yao 2015-12-15 11:48:19 -05:00 committed by Brian Behlendorf
parent 7323da1b2f
commit be29e6a6e6
2 changed files with 10 additions and 5 deletions
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4
include/sys/kobj.h
View File

@ -35,8 +35,8 @@ typedef struct _buf buf_t;
extern struct _buf *kobj_open_file(const char *name);
extern void kobj_close_file(struct _buf *file);
extern int kobj_read_file(struct _buf *file, char *buf,
ssize_t size, offset_t off);
extern int kobj_read_file(struct _buf *file, char *buf, unsigned size,
unsigned off);
extern int kobj_get_filesize(struct _buf *file, uint64_t *size);
#endif /* SPL_KOBJ_H */

11
module/spl/spl-kobj.c
View File

@ -57,10 +57,15 @@ kobj_close_file(struct _buf *file)
EXPORT_SYMBOL(kobj_close_file);
int
kobj_read_file(struct _buf *file, char *buf, ssize_t size, offset_t off)
kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
{
return (vn_rdwr(UIO_READ, file->vp, buf, size, off,
UIO_SYSSPACE, 0, RLIM64_INFINITY, 0, NULL));
ssize_t resid;
if (vn_rdwr(UIO_READ, file->vp, buf, size, (offset_t)off,
UIO_SYSSPACE, 0, 0, 0, &resid) != 0)
return (-1);
return (size - resid);
} /* kobj_read_file() */
EXPORT_SYMBOL(kobj_read_file);