| Message ID | 1544063533-10139-3-git-send-email-lizhijian@cn.fujitsu.com |
|---|---|
| State | New |
| Headers | show |
| Series | allow to load initrd below 4G for recent kernel | expand |
On Thu, Dec 06, 2018 at 10:32:11AM +0800, Li Zhijian wrote: > Don't expect read(2) can always read as many as it's told. > > Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com> > Reviewed-by: Richard Henderson <richard.henderson@linaro.org> This is more a theoretical bugfix than a refactoring right? > --- > V4: add reviewed-by tag > --- > hw/core/loader.c | 11 +++++------ > 1 file changed, 5 insertions(+), 6 deletions(-) > > diff --git a/hw/core/loader.c b/hw/core/loader.c > index fa41842..9cbceab 100644 > --- a/hw/core/loader.c > +++ b/hw/core/loader.c > @@ -77,21 +77,20 @@ int64_t get_image_size(const char *filename) > ssize_t load_image_size(const char *filename, void *addr, size_t size) > { > int fd; > - ssize_t actsize; > + ssize_t actsize, l = 0; > > fd = open(filename, O_RDONLY | O_BINARY); > if (fd < 0) { > return -1; > } > > - actsize = read(fd, addr, size); > - if (actsize < 0) { > - close(fd); > - return -1; > + while ((actsize = read(fd, addr + l, size - l)) > 0) { > + l += actsize; > } > + > close(fd); > > - return actsize; > + return actsize < 0 ? -1 : l; > } > > /* read()-like version */ > -- > 2.7.4
On 12/22/18 00:12, Michael S. Tsirkin wrote: > On Thu, Dec 06, 2018 at 10:32:11AM +0800, Li Zhijian wrote: >> Don't expect read(2) can always read as many as it's told. >> >> Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com> >> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> > This is more a theoretical bugfix than a refactoring right? Yes， it does. how about change the title to : "enhance reading on load_image_size()" or such Thanks Zhijian > >> --- >> V4: add reviewed-by tag >> --- >> hw/core/loader.c | 11 +++++------ >> 1 file changed, 5 insertions(+), 6 deletions(-) >> >> diff --git a/hw/core/loader.c b/hw/core/loader.c >> index fa41842..9cbceab 100644 >> --- a/hw/core/loader.c >> +++ b/hw/core/loader.c >> @@ -77,21 +77,20 @@ int64_t get_image_size(const char *filename) >> ssize_t load_image_size(const char *filename, void *addr, size_t size) >> { >> int fd; >> - ssize_t actsize; >> + ssize_t actsize, l = 0; >> >> fd = open(filename, O_RDONLY | O_BINARY); >> if (fd < 0) { >> return -1; >> } >> >> - actsize = read(fd, addr, size); >> - if (actsize < 0) { >> - close(fd); >> - return -1; >> + while ((actsize = read(fd, addr + l, size - l)) > 0) { >> + l += actsize; >> } >> + >> close(fd); >> >> - return actsize; >> + return actsize < 0 ? -1 : l; >> } >> >> /* read()-like version */ >> -- >> 2.7.4 > > >
On Mon, Dec 24, 2018 at 3:16 AM Li Zhijian <lizhijian@cn.fujitsu.com> wrote: > > > On 12/22/18 00:12, Michael S. Tsirkin wrote: > > On Thu, Dec 06, 2018 at 10:32:11AM +0800, Li Zhijian wrote: > >> Don't expect read(2) can always read as many as it's told. > >> > >> Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com> > >> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> > > This is more a theoretical bugfix than a refactoring right? > > Yes， it does. > > how about change the title to : "enhance reading on load_image_size()" or such Maybe something like this: "hw/core/loader.c: Read as long as possible in load_image_size()" Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> > > Thanks > Zhijian > > > > > >> --- > >> V4: add reviewed-by tag > >> --- > >> hw/core/loader.c | 11 +++++------ > >> 1 file changed, 5 insertions(+), 6 deletions(-) > >> > >> diff --git a/hw/core/loader.c b/hw/core/loader.c > >> index fa41842..9cbceab 100644 > >> --- a/hw/core/loader.c > >> +++ b/hw/core/loader.c > >> @@ -77,21 +77,20 @@ int64_t get_image_size(const char *filename) > >> ssize_t load_image_size(const char *filename, void *addr, size_t size) > >> { > >> int fd; > >> - ssize_t actsize; > >> + ssize_t actsize, l = 0; > >> > >> fd = open(filename, O_RDONLY | O_BINARY); > >> if (fd < 0) { > >> return -1; > >> } > >> > >> - actsize = read(fd, addr, size); > >> - if (actsize < 0) { > >> - close(fd); > >> - return -1; > >> + while ((actsize = read(fd, addr + l, size - l)) > 0) { > >> + l += actsize; > >> } > >> + > >> close(fd); > >> > >> - return actsize; > >> + return actsize < 0 ? -1 : l; > >> } > >> > >> /* read()-like version */ > >> -- > >> 2.7.4 > > > > > > > -- > Best regards. > Li Zhijian (8528) > > >
On 1/7/19 18:33, Stefano Garzarella wrote: > On Mon, Dec 24, 2018 at 3:16 AM Li Zhijian <lizhijian@cn.fujitsu.com> wrote: >> >> On 12/22/18 00:12, Michael S. Tsirkin wrote: >>> On Thu, Dec 06, 2018 at 10:32:11AM +0800, Li Zhijian wrote: >>>> Don't expect read(2) can always read as many as it's told. >>>> >>>> Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com> >>>> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> >>> This is more a theoretical bugfix than a refactoring right? >> Yes， it does. >> >> how about change the title to : "enhance reading on load_image_size()" or such > Maybe something like this: "hw/core/loader.c: Read as long as possible > in load_image_size()" It really helps, i will take your suggestion to the subject. Thanks Zhijian > > Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> >
diff --git a/hw/core/loader.c b/hw/core/loader.c index fa41842..9cbceab 100644 --- a/hw/core/loader.c +++ b/hw/core/loader.c @@ -77,21 +77,20 @@ int64_t get_image_size(const char *filename) ssize_t load_image_size(const char *filename, void *addr, size_t size) { int fd; - ssize_t actsize; + ssize_t actsize, l = 0; fd = open(filename, O_RDONLY | O_BINARY); if (fd < 0) { return -1; } - actsize = read(fd, addr, size); - if (actsize < 0) { - close(fd); - return -1; + while ((actsize = read(fd, addr + l, size - l)) > 0) { + l += actsize; } + close(fd); - return actsize; + return actsize < 0 ? -1 : l; } /* read()-like version */