diff options
author | Ingo Molnar <mingo@elte.hu> | 2008-06-16 11:20:37 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-06-16 11:20:37 +0200 |
commit | 3557b18fcbe0e29706214f3c7cc680a7823605eb (patch) | |
tree | 2a70696b78a9e8b5ba38090901301931d395ecfb /fs/libfs.c | |
parent | 4226ab93d8ae3fd895abe45879fe34d489a98718 (diff) | |
parent | 066519068ad2fbe98c7f45552b1f592903a9c8c8 (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.c | 18 |
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); |