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authorPaolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>2006-01-18 17:43:00 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-18 19:20:21 -0800
commit4833aff757b747b51b878a13f3a6e2b1a2abb619 (patch)
treecaec57a746cb04ef62e04fc5cf14a6acc555de46 /arch/um
parentce2d2aedcc3ca582fed90f44970e8b3e4f006a7d (diff)
downloadop-kernel-dev-4833aff757b747b51b878a13f3a6e2b1a2abb619.zip
op-kernel-dev-4833aff757b747b51b878a13f3a6e2b1a2abb619.tar.gz
[PATCH] uml: allow again to move backing file and to override saved location
When the user specifies both a COW file and its backing file, if the previous backing file is not found, currently UML tries again to use it and fails. This can be corrected by changing same_backing_files() return value in that case, so that the caller will try to change the COW file to point to the new location, as already done in other cases. Additionally, given the change in the meaning of the func, change its name, invert its return value, so all values are inverted except when stat(from_cow,&buf2) fails. And add some comments and two minor bugfixes - remove a fd leak (return err rather than goto out) and a repeated check. Tested well. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um')
-rw-r--r--arch/um/drivers/ubd_kern.c28
1 files changed, 15 insertions, 13 deletions
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 7696f8d..c171d0a 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -1103,31 +1103,33 @@ static int ubd_ioctl(struct inode * inode, struct file * file,
return(-EINVAL);
}
-static int same_backing_files(char *from_cmdline, char *from_cow, char *cow)
+static int path_requires_switch(char *from_cmdline, char *from_cow, char *cow)
{
struct uml_stat buf1, buf2;
int err;
- if(from_cmdline == NULL) return(1);
- if(!strcmp(from_cmdline, from_cow)) return(1);
+ if(from_cmdline == NULL)
+ return 0;
+ if(!strcmp(from_cmdline, from_cow))
+ return 0;
err = os_stat_file(from_cmdline, &buf1);
if(err < 0){
printk("Couldn't stat '%s', err = %d\n", from_cmdline, -err);
- return(1);
+ return 0;
}
err = os_stat_file(from_cow, &buf2);
if(err < 0){
printk("Couldn't stat '%s', err = %d\n", from_cow, -err);
- return(1);
+ return 1;
}
if((buf1.ust_dev == buf2.ust_dev) && (buf1.ust_ino == buf2.ust_ino))
- return(1);
+ return 0;
printk("Backing file mismatch - \"%s\" requested,\n"
"\"%s\" specified in COW header of \"%s\"\n",
from_cmdline, from_cow, cow);
- return(0);
+ return 1;
}
static int backing_file_mismatch(char *file, __u64 size, time_t mtime)
@@ -1189,7 +1191,7 @@ int open_ubd_file(char *file, struct openflags *openflags,
unsigned long long size;
__u32 version, align;
char *backing_file;
- int fd, err, sectorsize, same, mode = 0644;
+ int fd, err, sectorsize, asked_switch, mode = 0644;
fd = os_open_file(file, *openflags, mode);
if(fd < 0){
@@ -1209,6 +1211,7 @@ int open_ubd_file(char *file, struct openflags *openflags,
goto out_close;
}
+ /* Succesful return case! */
if(backing_file_out == NULL) return(fd);
err = read_cow_header(file_reader, &fd, &version, &backing_file, &mtime,
@@ -1220,17 +1223,16 @@ int open_ubd_file(char *file, struct openflags *openflags,
}
if(err) return(fd);
- if(backing_file_out == NULL) return(fd);
-
- same = same_backing_files(*backing_file_out, backing_file, file);
+ asked_switch = path_requires_switch(*backing_file_out, backing_file, file);
- if(!same && !backing_file_mismatch(*backing_file_out, size, mtime)){
+ /* Allow switching only if no mismatch. */
+ if (asked_switch && !backing_file_mismatch(*backing_file_out, size, mtime)) {
printk("Switching backing file to '%s'\n", *backing_file_out);
err = write_cow_header(file, fd, *backing_file_out,
sectorsize, align, &size);
if(err){
printk("Switch failed, errno = %d\n", -err);
- return(err);
+ goto out_close;
}
}
else {
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