The first one happens in
do_filp_open -> path_openat -> do_last -> handle_truncate -> do_truncate
-> notify_change -> simple_setattr -> setattr_prepare -> inode_newsize_ok.
Demo:
# dd if=/dev/zero of=/x bs=102400 count=1024
[...]
# mkswap /x && swapon /x
[...]
# strace dd if=/dev/zero of=/x count=1
[...]
open("/x", O_WRONLY|O_CREAT|O_TRUNC, 0666) = -1 ETXTBSY (Text file busy)
[...]
# strace dd if=/dev/zero of=/x count=1 conv=notrunc
[...]
open("/x", O_WRONLY|O_CREAT, 0666) = 3
dup2(3, 1) = 1
close(3) = 0
read(0, "\0\0\0\0[...]"..., 512) = 512
write(1, "\0\0\0\0[...]"..., 512) = 512
[...]
#
The second one is in kernel_read_file -> deny_write_access.
Signed-off-by: Jann Horn <jannh@xxxxxxxxxx>
---
man2/open.2 | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/man2/open.2 b/man2/open.2
index 4a43f32e0..858eb2660 100644
--- a/man2/open.2
+++ b/man2/open.2
@@ -1159,6 +1159,17 @@ requested.
refers to an executable image which is currently being executed and
write access was requested.
.TP
+.B ETXTBSY
+.I pathname
+refers to a file that is currently in use as a swap file, and the
+.B O_TRUNC
+flag was specified.
+.TP
+.B ETXTBSY
+.I pathname
+refers to a file that is currently being read by the kernel (e.g. for
+module/firmware loading), and write access was requested.
+.TP
.B EWOULDBLOCK
The
.B O_NONBLOCK
--
2.16.2.804.g6dcf76e118-goog
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