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-rw-r--r--source3/modules/vfs_readahead.c129
1 files changed, 88 insertions, 41 deletions
diff --git a/source3/modules/vfs_readahead.c b/source3/modules/vfs_readahead.c
index 2663326c99..550562d03d 100644
--- a/source3/modules/vfs_readahead.c
+++ b/source3/modules/vfs_readahead.c
@@ -22,35 +22,21 @@
static BOOL didmsg;
#endif
+struct readahead_data {
+ SMB_OFF_T off_bound;
+ SMB_OFF_T len;
+ BOOL didmsg;
+};
+
/*
* This module copes with Vista AIO read requests on Linux
* by detecting the initial 0x80000 boundary reads and causing
* the buffer cache to be filled in advance.
*/
-static unsigned long get_offset_boundary(struct vfs_handle_struct *handle)
-{
- SMB_OFF_T off_bound = conv_str_size(lp_parm_const_string(SNUM(handle->conn),
- "readahead",
- "offset",
- NULL));
- if (off_bound == 0) {
- off_bound = 0x80000;
- }
- return (unsigned long)off_bound;
-}
-
-static unsigned long get_offset_length(struct vfs_handle_struct *handle, unsigned long def_val)
-{
- SMB_OFF_T len = conv_str_size(lp_parm_const_string(SNUM(handle->conn),
- "readahead",
- "length",
- NULL));
- if (len == 0) {
- len = def_val;
- }
- return (unsigned long)len;
-}
+/*******************************************************************
+ sendfile wrapper that does readahead/posix_fadvise.
+*******************************************************************/
static ssize_t readahead_sendfile(struct vfs_handle_struct *handle,
int tofd,
@@ -60,27 +46,27 @@ static ssize_t readahead_sendfile(struct vfs_handle_struct *handle,
SMB_OFF_T offset,
size_t count)
{
- unsigned long off_bound = get_offset_boundary(handle);
- if ( offset % off_bound == 0) {
- unsigned long len = get_offset_length(handle, off_bound);
+ struct readahead_data *rhd = (struct readahead_data *)handle->data;
+
+ if ( offset % rhd->off_bound == 0) {
#if defined(HAVE_LINUX_READAHEAD)
- int err = readahead(fromfd, offset, (size_t)len);
+ int err = readahead(fromfd, offset, (size_t)rhd->len);
DEBUG(10,("readahead_sendfile: readahead on fd %u, offset %llu, len %u returned %d\n",
(unsigned int)fromfd,
(unsigned long long)offset,
- (unsigned int)len,
+ (unsigned int)rhd->len,
err ));
#elif defined(HAVE_POSIX_FADVISE)
- int err = posix_fadvise(fromfd, offset, (off_t)len, POSIX_FADV_WILLNEED);
+ int err = posix_fadvise(fromfd, offset, (off_t)rhd->len, POSIX_FADV_WILLNEED);
DEBUG(10,("readahead_sendfile: posix_fadvise on fd %u, offset %llu, len %u returned %d\n",
(unsigned int)fromfd,
(unsigned long long)offset,
- (unsigned int)len,
+ (unsigned int)rhd->len,
err ));
#else
- if (!didmsg) {
+ if (!rhd->didmsg) {
DEBUG(0,("readahead_sendfile: no readahead on this platform\n"));
- didmsg = True;
+ rhd->didmsg = True;
}
#endif
}
@@ -93,6 +79,10 @@ static ssize_t readahead_sendfile(struct vfs_handle_struct *handle,
count);
}
+/*******************************************************************
+ pread wrapper that does readahead/posix_fadvise.
+*******************************************************************/
+
static ssize_t readahead_pread(vfs_handle_struct *handle,
files_struct *fsp,
int fd,
@@ -100,40 +90,97 @@ static ssize_t readahead_pread(vfs_handle_struct *handle,
size_t count,
SMB_OFF_T offset)
{
- unsigned long off_bound = get_offset_boundary(handle);
- if ( offset % off_bound == 0) {
- unsigned long len = get_offset_length(handle, off_bound);
+ struct readahead_data *rhd = (struct readahead_data *)handle->data;
+
+ if ( offset % rhd->off_bound == 0) {
#if defined(HAVE_LINUX_READAHEAD)
- int err = readahead(fd, offset, (size_t)len);
+ int err = readahead(fd, offset, (size_t)rhd->len);
DEBUG(10,("readahead_pread: readahead on fd %u, offset %llu, len %u returned %d\n",
(unsigned int)fd,
(unsigned long long)offset,
- (unsigned int)len,
+ (unsigned int)rhd->len,
err ));
#elif defined(HAVE_POSIX_FADVISE)
- int err = posix_fadvise(fromfd, offset, (off_t)len, POSIX_FADV_WILLNEED);
+ int err = posix_fadvise(fromfd, offset, (off_t)rhd->len, POSIX_FADV_WILLNEED);
DEBUG(10,("readahead_pread: posix_fadvise on fd %u, offset %llu, len %u returned %d\n",
(unsigned int)fd,
(unsigned long long)offset,
- (unsigned int)len,
+ (unsigned int)rhd->len,
(err ));
#else
- if (!didmsg) {
+ if (!rhd->didmsg) {
DEBUG(0,("readahead_pread: no readahead on this platform\n"));
- didmsg = True;
+ rhd->didmsg = True;
}
#endif
}
return SMB_VFS_NEXT_PREAD(handle, fsp, fd, data, count, offset);
}
+/*******************************************************************
+ Directly called from main smbd when freeing handle.
+*******************************************************************/
+
+static void free_readahead_data(void **pptr)
+{
+ SAFE_FREE(*pptr);
+}
+
+/*******************************************************************
+ Allocate the handle specific data so we don't call the expensive
+ conv_str_size function for each sendfile/pread.
+*******************************************************************/
+
+static int readahead_connect(struct vfs_handle_struct *handle,
+ const char *service,
+ const char *user)
+{
+ struct readahead_data *rhd = SMB_MALLOC_P(struct readahead_data);
+ if (!rhd) {
+ DEBUG(0,("readahead_connect: out of memory\n"));
+ return -1;
+ }
+ ZERO_STRUCTP(rhd);
+
+ rhd->didmsg = False;
+ rhd->off_bound = conv_str_size(lp_parm_const_string(SNUM(handle->conn),
+ "readahead",
+ "offset",
+ NULL));
+ if (rhd->off_bound == 0) {
+ rhd->off_bound = 0x80000;
+ }
+ rhd->len = conv_str_size(lp_parm_const_string(SNUM(handle->conn),
+ "readahead",
+ "length",
+ NULL));
+ if (rhd->len == 0) {
+ rhd->len = rhd->off_bound;
+ }
+
+ handle->data = (void *)rhd;
+ handle->free_data = free_readahead_data;
+ return 0;
+}
+
+/*******************************************************************
+ Functions we're replacing.
+ We don't replace read as it isn't used from smbd to read file
+ data.
+*******************************************************************/
+
static vfs_op_tuple readahead_ops [] =
{
{SMB_VFS_OP(readahead_sendfile), SMB_VFS_OP_SENDFILE, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(readahead_pread), SMB_VFS_OP_PREAD, SMB_VFS_LAYER_TRANSPARENT},
+ {SMB_VFS_OP(readahead_connect), SMB_VFS_OP_CONNECT, SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
};
+/*******************************************************************
+ Module initialization boilerplate.
+*******************************************************************/
+
NTSTATUS vfs_readahead_init(void);
NTSTATUS vfs_readahead_init(void)
{
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