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fs: sysfs: return EGBIG on write if offset is larger than file size 

According to the user expectations common utilities like dd or sh
redirection operator > should work correctly over binary files from
sysfs. At the moment doing excessive write can not be completed:

  write(1, "\0\0\0\0\0\0\0\0", 8)         = 4
  write(1, "\0\0\0\0", 4)                 = 0
  write(1, "\0\0\0\0", 4)                 = 0
  write(1, "\0\0\0\0", 4)                 = 0
  ...

Fix the problem by returning EFBIG described in man 2 write.

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vladimir Zapolskiy 2014-09-24 18:21:04 +03:00 committed by Greg Kroah-Hartman
parent 41fb96a4b6
commit 0936896056
1 changed files with 1 additions and 1 deletions
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2
fs/sysfs/file.c
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@ -125,7 +125,7 @@ static ssize_t sysfs_kf_bin_write(struct kernfs_open_file *of, char *buf,
if (size) {
if (size <= pos)
return 0;
return -EFBIG;
count = min_t(ssize_t, count, size - pos);
}
if (!count)