diff options
Diffstat (limited to 'source3/modules/vfs_readahead.c')
-rw-r--r-- | source3/modules/vfs_readahead.c | 129 |
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) { |