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author | David S. Miller <davem@davemloft.net> | 2010-05-31 05:46:45 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2010-05-31 05:46:45 -0700 |
commit | 64960848abd18d0bcde3f53ffa7ed0b631e6b25d (patch) | |
tree | 8424a1c550a98ce09f127425fde9b7b5f2f5027a /fs/read_write.c | |
parent | 2903037400a26e7c0cc93ab75a7d62abfacdf485 (diff) | |
parent | 67a3e12b05e055c0415c556a315a3d3eb637e29e (diff) |
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
Diffstat (limited to 'fs/read_write.c')
-rw-r--r-- | fs/read_write.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index 113386d6fd2d..9c0485236e68 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -97,6 +97,23 @@ loff_t generic_file_llseek(struct file *file, loff_t offset, int origin) } EXPORT_SYMBOL(generic_file_llseek); +/** + * noop_llseek - No Operation Performed llseek implementation + * @file: file structure to seek on + * @offset: file offset to seek to + * @origin: type of seek + * + * This is an implementation of ->llseek useable for the rare special case when + * userspace expects the seek to succeed but the (device) file is actually not + * able to perform the seek. In this case you use noop_llseek() instead of + * falling back to the default implementation of ->llseek. + */ +loff_t noop_llseek(struct file *file, loff_t offset, int origin) +{ + return file->f_pos; +} +EXPORT_SYMBOL(noop_llseek); + loff_t no_llseek(struct file *file, loff_t offset, int origin) { return -ESPIPE; |