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authorMiklos Szeredi <miklos@szeredi.hu>2005-09-09 13:10:33 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-09 14:03:46 -0700
commitdb50b96c0f28a21c5a4a19ecaba12d0972aab06a (patch)
treed7f2cb99de499c116ce08153a369044af0622c16 /fs
parent06663267b4b1e85ece73236ea720355668d4f736 (diff)
downloadlinux-stericsson-db50b96c0f28a21c5a4a19ecaba12d0972aab06a.tar.gz
[PATCH] FUSE - readpages operation
This patch adds readpages support to FUSE. With the help of the readpages() operation multiple reads are bundled together and sent as a single request to userspace. This can improve reading performace. Signed-off-by: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/fuse/file.c67
-rw-r--r--fs/fuse/fuse_i.h3
-rw-r--r--fs/fuse/inode.c15
3 files changed, 85 insertions, 0 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 96ea302db184..86ffb6db5fe7 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -227,6 +227,72 @@ static int fuse_readpage(struct file *file, struct page *page)
return err;
}
+static int fuse_send_readpages(struct fuse_req *req, struct file *file,
+ struct inode *inode)
+{
+ loff_t pos = (loff_t) req->pages[0]->index << PAGE_CACHE_SHIFT;
+ size_t count = req->num_pages << PAGE_CACHE_SHIFT;
+ unsigned i;
+ req->out.page_zeroing = 1;
+ fuse_send_read(req, file, inode, pos, count);
+ for (i = 0; i < req->num_pages; i++) {
+ struct page *page = req->pages[i];
+ if (!req->out.h.error)
+ SetPageUptodate(page);
+ unlock_page(page);
+ }
+ return req->out.h.error;
+}
+
+struct fuse_readpages_data {
+ struct fuse_req *req;
+ struct file *file;
+ struct inode *inode;
+};
+
+static int fuse_readpages_fill(void *_data, struct page *page)
+{
+ struct fuse_readpages_data *data = _data;
+ struct fuse_req *req = data->req;
+ struct inode *inode = data->inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+
+ if (req->num_pages &&
+ (req->num_pages == FUSE_MAX_PAGES_PER_REQ ||
+ (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read ||
+ req->pages[req->num_pages - 1]->index + 1 != page->index)) {
+ int err = fuse_send_readpages(req, data->file, inode);
+ if (err) {
+ unlock_page(page);
+ return err;
+ }
+ fuse_reset_request(req);
+ }
+ req->pages[req->num_pages] = page;
+ req->num_pages ++;
+ return 0;
+}
+
+static int fuse_readpages(struct file *file, struct address_space *mapping,
+ struct list_head *pages, unsigned nr_pages)
+{
+ struct inode *inode = mapping->host;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_readpages_data data;
+ int err;
+ data.file = file;
+ data.inode = inode;
+ data.req = fuse_get_request_nonint(fc);
+ if (!data.req)
+ return -EINTR;
+
+ err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);
+ if (!err && data.req->num_pages)
+ err = fuse_send_readpages(data.req, file, inode);
+ fuse_put_request(fc, data.req);
+ return err;
+}
+
static ssize_t fuse_send_write(struct fuse_req *req, struct file *file,
struct inode *inode, loff_t pos, size_t count)
{
@@ -331,6 +397,7 @@ static struct address_space_operations fuse_file_aops = {
.readpage = fuse_readpage,
.prepare_write = fuse_prepare_write,
.commit_write = fuse_commit_write,
+ .readpages = fuse_readpages,
.set_page_dirty = fuse_set_page_dirty,
};
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 86183c562104..aff3a01ea02b 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -201,6 +201,9 @@ struct fuse_conn {
/** The fuse mount flags for this mount */
unsigned flags;
+ /** Maximum read size */
+ unsigned max_read;
+
/** Readers of the connection are waiting on this */
wait_queue_head_t waitq;
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 458c62ca0fec..0b75c73386e9 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -32,6 +32,7 @@ struct fuse_mount_data {
unsigned rootmode;
unsigned user_id;
unsigned flags;
+ unsigned max_read;
};
static struct inode *fuse_alloc_inode(struct super_block *sb)
@@ -250,6 +251,7 @@ enum {
OPT_DEFAULT_PERMISSIONS,
OPT_ALLOW_OTHER,
OPT_KERNEL_CACHE,
+ OPT_MAX_READ,
OPT_ERR
};
@@ -260,6 +262,7 @@ static match_table_t tokens = {
{OPT_DEFAULT_PERMISSIONS, "default_permissions"},
{OPT_ALLOW_OTHER, "allow_other"},
{OPT_KERNEL_CACHE, "kernel_cache"},
+ {OPT_MAX_READ, "max_read=%u"},
{OPT_ERR, NULL}
};
@@ -268,6 +271,7 @@ static int parse_fuse_opt(char *opt, struct fuse_mount_data *d)
char *p;
memset(d, 0, sizeof(struct fuse_mount_data));
d->fd = -1;
+ d->max_read = ~0;
while ((p = strsep(&opt, ",")) != NULL) {
int token;
@@ -308,6 +312,12 @@ static int parse_fuse_opt(char *opt, struct fuse_mount_data *d)
d->flags |= FUSE_KERNEL_CACHE;
break;
+ case OPT_MAX_READ:
+ if (match_int(&args[0], &value))
+ return 0;
+ d->max_read = value;
+ break;
+
default:
return 0;
}
@@ -329,6 +339,8 @@ static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
seq_puts(m, ",allow_other");
if (fc->flags & FUSE_KERNEL_CACHE)
seq_puts(m, ",kernel_cache");
+ if (fc->max_read != ~0)
+ seq_printf(m, ",max_read=%u", fc->max_read);
return 0;
}
@@ -453,6 +465,9 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
fc->flags = d.flags;
fc->user_id = d.user_id;
+ fc->max_read = d.max_read;
+ if (fc->max_read / PAGE_CACHE_SIZE < fc->bdi.ra_pages)
+ fc->bdi.ra_pages = fc->max_read / PAGE_CACHE_SIZE;
err = -ENOMEM;
root = get_root_inode(sb, d.rootmode);