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pagemap: return EINVAL, not EIO, for unaligned reads of kpagecount or kpageflags 

If the user tries to read from a position that is not a multiple of 8, or
read a number of bytes that is not a multiple of 8, they have passed an
invalid argument to read, for the purpose of reading these files.  It's
not an IO error because we didn't encounter any trouble finding the data
they asked for.

Signed-off-by: Thomas Tuttle <ttuttle@google.com>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Thomas Tuttle 2008-06-05 22:46:58 -07:00 committed by Linus Torvalds
parent bbcdac0c20
commit 4710d1ac4c
1 changed files with 2 additions and 2 deletions
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4
fs/proc/proc_misc.c
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@ -716,7 +716,7 @@ static ssize_t kpagecount_read(struct file *file, char __user *buf,
pfn = src / KPMSIZE; pfn = src / KPMSIZE;
count = min_t(size_t, count, (max_pfn * KPMSIZE) - src); count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
if (src & KPMMASK || count & KPMMASK) if (src & KPMMASK || count & KPMMASK)
return -EIO; return -EINVAL;
while (count > 0) { while (count > 0) {
ppage = NULL; ppage = NULL;
@ -782,7 +782,7 @@ static ssize_t kpageflags_read(struct file *file, char __user *buf,
pfn = src / KPMSIZE; pfn = src / KPMSIZE;
count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src); count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
if (src & KPMMASK || count & KPMMASK) if (src & KPMMASK || count & KPMMASK)
return -EIO; return -EINVAL;
while (count > 0) { while (count > 0) {
ppage = NULL; ppage = NULL;