From d809161402e9f99aefe8848c4e701597ac367269 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Wed, 6 Dec 2006 20:35:48 -0800 Subject: [PATCH] [PATCH] fuse: add blksize option Add 'blksize' option for block device based filesystems. During initialization this is used to set the block size on the device and the super block. The default block size is 512bytes. Signed-off-by: Miklos Szeredi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/filesystems/fuse.txt | 5 +++++ fs/fuse/inode.c | 24 ++++++++++++++++++++---- 2 files changed, 25 insertions(+), 4 deletions(-) diff --git a/Documentation/filesystems/fuse.txt b/Documentation/filesystems/fuse.txt index fd17dce..345392c 100644 --- a/Documentation/filesystems/fuse.txt +++ b/Documentation/filesystems/fuse.txt @@ -110,6 +110,11 @@ Mount options The default is infinite. Note that the size of read requests is limited anyway to 32 pages (which is 128kbyte on i386). +'blksize=N' + + Set the block size for the filesystem. The default is 512. This + option is only valid for 'fuseblk' type mounts. + Control filesystem ~~~~~~~~~~~~~~~~~~ diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 38cf97d..1baaaeb2 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -39,6 +39,7 @@ struct fuse_mount_data { unsigned group_id_present : 1; unsigned flags; unsigned max_read; + unsigned blksize; }; static struct inode *fuse_alloc_inode(struct super_block *sb) @@ -274,6 +275,7 @@ enum { OPT_DEFAULT_PERMISSIONS, OPT_ALLOW_OTHER, OPT_MAX_READ, + OPT_BLKSIZE, OPT_ERR }; @@ -285,14 +287,16 @@ static match_table_t tokens = { {OPT_DEFAULT_PERMISSIONS, "default_permissions"}, {OPT_ALLOW_OTHER, "allow_other"}, {OPT_MAX_READ, "max_read=%u"}, + {OPT_BLKSIZE, "blksize=%u"}, {OPT_ERR, NULL} }; -static int parse_fuse_opt(char *opt, struct fuse_mount_data *d) +static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) { char *p; memset(d, 0, sizeof(struct fuse_mount_data)); d->max_read = ~0; + d->blksize = 512; while ((p = strsep(&opt, ",")) != NULL) { int token; @@ -345,6 +349,12 @@ static int parse_fuse_opt(char *opt, struct fuse_mount_data *d) d->max_read = value; break; + case OPT_BLKSIZE: + if (!is_bdev || match_int(&args[0], &value)) + return 0; + d->blksize = value; + break; + default: return 0; } @@ -500,15 +510,21 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent) struct dentry *root_dentry; struct fuse_req *init_req; int err; + int is_bdev = sb->s_bdev != NULL; if (sb->s_flags & MS_MANDLOCK) return -EINVAL; - if (!parse_fuse_opt((char *) data, &d)) + if (!parse_fuse_opt((char *) data, &d, is_bdev)) return -EINVAL; - sb->s_blocksize = PAGE_CACHE_SIZE; - sb->s_blocksize_bits = PAGE_CACHE_SHIFT; + if (is_bdev) { + if (!sb_set_blocksize(sb, d.blksize)) + return -EINVAL; + } else { + sb->s_blocksize = PAGE_CACHE_SIZE; + sb->s_blocksize_bits = PAGE_CACHE_SHIFT; + } sb->s_magic = FUSE_SUPER_MAGIC; sb->s_op = &fuse_super_operations; sb->s_maxbytes = MAX_LFS_FILESIZE; -- 2.7.4