diff options
Diffstat (limited to 'fs/fuse/dax.c')
| -rw-r--r-- | fs/fuse/dax.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/fs/fuse/dax.c b/fs/fuse/dax.c index 031106020f75..fec8a2bd75b3 100644 --- a/fs/fuse/dax.c +++ b/fs/fuse/dax.c @@ -9,7 +9,10 @@ #include <linux/dax.h> #include <linux/pfn_t.h> -/* Default memory range size, 2MB */ +/* + * Default memory range size. A power of 2 so it agrees with common FUSE_INIT + * map_alignment values 4KB and 64KB. + */ #define FUSE_DAX_SHIFT 21 #define FUSE_DAX_SZ (1 << FUSE_DAX_SHIFT) #define FUSE_DAX_PAGES (FUSE_DAX_SZ / PAGE_SIZE) @@ -123,3 +126,13 @@ int fuse_dax_conn_alloc(struct fuse_conn *fc, struct dax_device *dax_dev) fc->dax = fcd; return 0; } + +bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int map_alignment) +{ + if (fc->dax && (map_alignment > FUSE_DAX_SHIFT)) { + pr_warn("FUSE: map_alignment %u incompatible with dax mem range size %u\n", + map_alignment, FUSE_DAX_SZ); + return false; + } + return true; +} |