diff options
Diffstat (limited to 'usr/src/uts/common/sys/vnode.h')
| -rw-r--r-- | usr/src/uts/common/sys/vnode.h | 56 |
1 files changed, 46 insertions, 10 deletions
diff --git a/usr/src/uts/common/sys/vnode.h b/usr/src/uts/common/sys/vnode.h index b8702bc8f5..df5da6c2e7 100644 --- a/usr/src/uts/common/sys/vnode.h +++ b/usr/src/uts/common/sys/vnode.h @@ -21,7 +21,7 @@ /* * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved. - * Copyright (c) 2018, Joyent, Inc. + * Copyright 2020 Joyent, Inc. * Copyright (c) 2011, 2017 by Delphix. All rights reserved. * Copyright 2017 RackTop Systems. */ @@ -197,6 +197,7 @@ struct vsd_node { * v_count * v_shrlocks * v_path + * v_phantom_count * v_vsd * v_xattrdir * @@ -214,6 +215,7 @@ struct vsd_node { * v_lock * v_flag * v_count + * v_phantom_count * v_data * v_vfsp * v_stream @@ -285,6 +287,8 @@ typedef struct vnode { kmutex_t v_lock; /* protects vnode fields */ uint_t v_flag; /* vnode flags (see below) */ uint_t v_count; /* reference count */ + /* non vn_count() ref count (see below) */ + uint_t v_phantom_count; void *v_data; /* private data for fs */ struct vfs *v_vfsp; /* ptr to containing VFS */ struct stdata *v_stream; /* associated stream */ @@ -811,13 +815,15 @@ typedef enum vnevent { VE_REMOVE = 3, /* Remove of vnode's name */ VE_RMDIR = 4, /* Remove of directory vnode's name */ VE_CREATE = 5, /* Create with vnode's name which exists */ - VE_LINK = 6, /* Link with vnode's name as source */ - VE_RENAME_DEST_DIR = 7, /* Rename with vnode as target dir */ - VE_MOUNTEDOVER = 8, /* File or Filesystem got mounted over vnode */ + VE_LINK = 6, /* Link with vnode's name as source */ + VE_RENAME_DEST_DIR = 7, /* Rename with vnode as target dir */ + VE_MOUNTEDOVER = 8, /* File or Filesystem got mounted over vnode */ VE_TRUNCATE = 9, /* Truncate */ VE_PRE_RENAME_SRC = 10, /* Pre-rename, with vnode as source */ VE_PRE_RENAME_DEST = 11, /* Pre-rename, with vnode as target/dest. */ - VE_PRE_RENAME_DEST_DIR = 12 /* Pre-rename with vnode as target dir */ + VE_PRE_RENAME_DEST_DIR = 12, /* Pre-rename with vnode as target dir */ + VE_RENAME_SRC_DIR = 13, /* Rename with vnode as source dir */ + VE_RESIZE = 14 /* Resize/truncate to non-zero offset */ } vnevent_t; /* @@ -1292,9 +1298,9 @@ void vn_recycle(vnode_t *); void vn_free(vnode_t *); int vn_is_readonly(vnode_t *); -int vn_is_opened(vnode_t *, v_mode_t); -int vn_is_mapped(vnode_t *, v_mode_t); -int vn_has_other_opens(vnode_t *, v_mode_t); +int vn_is_opened(vnode_t *, v_mode_t); +int vn_is_mapped(vnode_t *, v_mode_t); +int vn_has_other_opens(vnode_t *, v_mode_t); void vn_open_upgrade(vnode_t *, int); void vn_open_downgrade(vnode_t *, int); @@ -1333,10 +1339,12 @@ int vn_createat(char *pnamep, enum uio_seg seg, struct vattr *vap, int vn_rdwr(enum uio_rw rw, struct vnode *vp, caddr_t base, ssize_t len, offset_t offset, enum uio_seg seg, int ioflag, rlim64_t ulimit, cred_t *cr, ssize_t *residp); +uint_t vn_count(struct vnode *vp); void vn_rele(struct vnode *vp); void vn_rele_async(struct vnode *vp, struct taskq *taskq); void vn_rele_dnlc(struct vnode *vp); void vn_rele_stream(struct vnode *vp); +void vn_phantom_rele(struct vnode *vp); int vn_link(char *from, char *to, enum uio_seg seg); int vn_linkat(vnode_t *fstartvp, char *from, enum symfollow follow, vnode_t *tstartvp, char *to, enum uio_seg seg); @@ -1377,7 +1385,8 @@ void vnevent_remove(vnode_t *, vnode_t *, char *, caller_context_t *); void vnevent_rmdir(vnode_t *, vnode_t *, char *, caller_context_t *); void vnevent_create(vnode_t *, caller_context_t *); void vnevent_link(vnode_t *, caller_context_t *); -void vnevent_rename_dest_dir(vnode_t *, caller_context_t *ct); +void vnevent_rename_dest_dir(vnode_t *, vnode_t *, char *, + caller_context_t *ct); void vnevent_mountedover(vnode_t *, caller_context_t *); void vnevent_truncate(vnode_t *, caller_context_t *); int vnevent_support(vnode_t *, caller_context_t *); @@ -1387,6 +1396,7 @@ void vnevent_pre_rename_dest(vnode_t *, vnode_t *, char *, caller_context_t *); void vnevent_pre_rename_dest_dir(vnode_t *, vnode_t *, char *, caller_context_t *); +void vnevent_resize(vnode_t *, caller_context_t *); /* Vnode specific data */ void vsd_create(uint_t *, void (*)(void *)); @@ -1439,6 +1449,16 @@ extern uint_t pvn_vmodsort_supported; * this->vp->v_path == NULL ? "NULL" : stringof(this->vp->v_path), * this->vp->v_count) * }' + * + * There are some situations where we don't want a hold to make the vnode + * 'busy'. For example, watching a directory via port events or inotify + * should not prevent a filesystem from mounting on a watched directory. + * For those instances, a phantom hold is used via VN_PHANTOM_HOLD(). + * + * A phantom hold works identically to regular hold, except that those holds + * are excluded from the return value of vn_count(). + * + * A phantom hold must be released by VN_PHANTOM_RELE(). */ #define VN_HOLD_LOCKED(vp) { \ ASSERT(mutex_owned(&(vp)->v_lock)); \ @@ -1467,6 +1487,22 @@ extern uint_t pvn_vmodsort_supported; DTRACE_PROBE1(vn__rele, vnode_t *, vp); \ } +#define VN_PHANTOM_HOLD_LOCKED(vp) { \ + VN_HOLD_LOCKED(vp); \ + (vp)->v_phantom_count++; \ + DTRACE_PROBE1(vn__phantom_hold, vnode_t *, vp); \ +} + +#define VN_PHANTOM_HOLD(vp) { \ + mutex_enter(&(vp)->v_lock); \ + VN_PHANTOM_HOLD_LOCKED(vp); \ + mutex_exit(&(vp)->v_lock); \ +} + +#define VN_PHANTOM_RELE(vp) { \ + vn_phantom_rele(vp); \ +} + #define VN_SET_VFS_TYPE_DEV(vp, vfsp, type, dev) { \ (vp)->v_vfsp = (vfsp); \ (vp)->v_type = (type); \ @@ -1477,7 +1513,7 @@ extern uint_t pvn_vmodsort_supported; * Compare two vnodes for equality. In general this macro should be used * in preference to calling VOP_CMP directly. */ -#define VN_CMP(VP1, VP2) ((VP1) == (VP2) ? 1 : \ +#define VN_CMP(VP1, VP2) ((VP1) == (VP2) ? 1 : \ ((VP1) && (VP2) && (vn_getops(VP1) == vn_getops(VP2)) ? \ VOP_CMP(VP1, VP2, NULL) : 0)) |