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authorIngo Molnar <mingo@elte.hu>2008-06-16 11:20:37 +0200
committerIngo Molnar <mingo@elte.hu>2008-06-16 11:20:37 +0200
commit3557b18fcbe0e29706214f3c7cc680a7823605eb (patch)
tree2a70696b78a9e8b5ba38090901301931d395ecfb /fs/libfs.c
parent4226ab93d8ae3fd895abe45879fe34d489a98718 (diff)
parent066519068ad2fbe98c7f45552b1f592903a9c8c8 (diff)
Merge branch 'linus' into x86/ptemasktip-x86-ptemask-2008-06-16_09.20_Mon
Diffstat (limited to 'fs/libfs.c')
-rw-r--r--fs/libfs.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/libfs.c b/fs/libfs.c
index b004dfadd891..892d41cb3382 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -528,6 +528,23 @@ ssize_t simple_read_from_buffer(void __user *to, size_t count, loff_t *ppos,
return count;
}
+ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
+ const void *from, size_t available)
+{
+ loff_t pos = *ppos;
+
+ if (pos < 0)
+ return -EINVAL;
+ if (pos >= available)
+ return 0;
+ if (count > available - pos)
+ count = available - pos;
+ memcpy(to, from + pos, count);
+ *ppos = pos + count;
+
+ return count;
+}
+
/*
* Transaction based IO.
* The file expects a single write which triggers the transaction, and then
@@ -800,6 +817,7 @@ EXPORT_SYMBOL(simple_statfs);
EXPORT_SYMBOL(simple_sync_file);
EXPORT_SYMBOL(simple_unlink);
EXPORT_SYMBOL(simple_read_from_buffer);
+EXPORT_SYMBOL(memory_read_from_buffer);
EXPORT_SYMBOL(simple_transaction_get);
EXPORT_SYMBOL(simple_transaction_read);
EXPORT_SYMBOL(simple_transaction_release);