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FUSE: Document global sysctl knobs

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So that I don't have to keep grepping around the codebase to remember what each
one does.  And maybe it saves someone else some time.

Fix a trivial whitespace issue while here.

No functional change.

Sponsored by:	Dell EMC Isilon
This commit is contained in:
cem 2018-08-15 17:41:19 +00:00
parent cf43600549
commit ac707f043f
1 changed files with 19 additions and 8 deletions
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27
sys/fs/fuse/fuse_node.c
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@ -97,37 +97,48 @@ MALLOC_DEFINE(M_FUSEVN, "fuse_vnode", "fuse vnode private data");
static int fuse_node_count = 0;
SYSCTL_INT(_vfs_fuse, OID_AUTO, node_count, CTLFLAG_RD,
&fuse_node_count, 0, "");
&fuse_node_count, 0, "Count of FUSE vnodes");
int fuse_data_cache_enable = 1;
SYSCTL_INT(_vfs_fuse, OID_AUTO, data_cache_enable, CTLFLAG_RW,
&fuse_data_cache_enable, 0, "");
&fuse_data_cache_enable, 0,
"enable caching of FUSE file data (including dirty data)");
int fuse_data_cache_invalidate = 0;
SYSCTL_INT(_vfs_fuse, OID_AUTO, data_cache_invalidate, CTLFLAG_RW,
&fuse_data_cache_invalidate, 0, "");
&fuse_data_cache_invalidate, 0,
"If non-zero, discard cached clean file data when there are no active file"
" users");
int fuse_mmap_enable = 1;
SYSCTL_INT(_vfs_fuse, OID_AUTO, mmap_enable, CTLFLAG_RW,
&fuse_mmap_enable, 0, "");
&fuse_mmap_enable, 0,
"If non-zero, and data_cache_enable is also non-zero, enable mmap(2) of "
"FUSE files");
int fuse_refresh_size = 0;
SYSCTL_INT(_vfs_fuse, OID_AUTO, refresh_size, CTLFLAG_RW,
&fuse_refresh_size, 0, "");
&fuse_refresh_size, 0,
"If non-zero, and no dirty file extension data is buffered, fetch file "
"size before write operations");
int fuse_sync_resize = 1;
SYSCTL_INT(_vfs_fuse, OID_AUTO, sync_resize, CTLFLAG_RW,
&fuse_sync_resize, 0, "");
&fuse_sync_resize, 0,
"If a cached write extended a file, inform FUSE filesystem of the changed"
"size immediately subsequent to the issued writes");
int fuse_fix_broken_io = 0;
SYSCTL_INT(_vfs_fuse, OID_AUTO, fix_broken_io, CTLFLAG_RW,
&fuse_fix_broken_io, 0, "");
&fuse_fix_broken_io, 0,
"If non-zero, print a diagnostic warning if a userspace filesystem returns"
" EIO on reads of recently extended portions of files");
static void
fuse_vnode_init(struct vnode *vp, struct fuse_vnode_data *fvdat,
@ -336,7 +347,7 @@ fuse_vnode_savesize(struct vnode *vp, struct ucred *cred)
fsai->valid = 0;
/* Truncate to a new value. */
fsai->size = fvdat->filesize;
fsai->size = fvdat->filesize;
fsai->valid |= FATTR_SIZE;
fuse_filehandle_getrw(vp, FUFH_WRONLY, &fufh);