Author: kib
Date: Thu Jan 26 10:49:45 2017
New Revision: 312803
URL: https://svnweb.freebsd.org/changeset/base/312803
Log:
MFC r312409:
Style fixes and comment updates.
MFC r312435:
Remove mistakenly merged field.
Modified:
stable/10/sys/fs/tmpfs/tmpfs.h
stable/10/sys/fs/tmpfs/tmpfs_subr.c
stable/10/sys/fs/tmpfs/tmpfs_vfsops.c
stable/10/sys/fs/tmpfs/tmpfs_vnops.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/fs/tmpfs/tmpfs.h
==============================================================================
--- stable/10/sys/fs/tmpfs/tmpfs.h Thu Jan 26 10:47:05 2017
(r312802)
+++ stable/10/sys/fs/tmpfs/tmpfs.h Thu Jan 26 10:49:45 2017
(r312803)
@@ -80,8 +80,10 @@ struct tmpfs_dirent {
uint32_t td_hash;
u_int td_namelen;
- /* Pointer to the node this entry refers to. In case this field
- * is NULL, the node is a whiteout. */
+ /*
+ * Pointer to the node this entry refers to. In case this field
+ * is NULL, the node is a whiteout.
+ */
struct tmpfs_node * td_node;
union {
@@ -94,21 +96,24 @@ struct tmpfs_dirent {
} ud;
};
-/* A directory in tmpfs holds a list of directory entries, which in
- * turn point to other files (which can be directories themselves).
+/*
+ * A directory in tmpfs holds a collection of directory entries, which
+ * in turn point to other files (which can be directories themselves).
*
- * In tmpfs, this list is managed by a RB-Tree, whose head is defined by
- * the struct tmpfs_dir type.
+ * In tmpfs, this collection is managed by a RB-Tree, whose head is
+ * defined by the struct tmpfs_dir type.
*
* It is important to notice that directories do not have entries for . and
* .. as other file systems do. These can be generated when requested
* based on information available by other means, such as the pointer to
* the node itself in the former case or the pointer to the parent directory
* in the latter case. This is done to simplify tmpfs's code and, more
- * importantly, to remove redundancy. */
+ * importantly, to remove redundancy.
+ */
RB_HEAD(tmpfs_dir, tmpfs_dirent);
-/* Each entry in a directory has a cookie that identifies it. Cookies
+/*
+ * Each entry in a directory has a cookie that identifies it. Cookies
* supersede offsets within directories because, given how tmpfs stores
* directories in memory, there is no such thing as an offset.
*
@@ -139,51 +144,65 @@ RB_HEAD(tmpfs_dir, tmpfs_dirent);
* a particular type. The code must be careful to only access those
* attributes that are actually allowed by the node's type.
*
- *
* Below is the key of locks used to protected the fields in the following
* structures.
- *
+ * (v) vnode lock in exclusive mode
+ * (vi) vnode lock in exclusive mode, or vnode lock in shared vnode and
+ * tn_interlock
+ * (i) tn_interlock
+ * (m) tmpfs_mount allnode_lock
+ * (c) stable after creation
*/
struct tmpfs_node {
- /* Doubly-linked list entry which links all existing nodes for a
- * single file system. This is provided to ease the removal of
- * all nodes during the unmount operation. */
- LIST_ENTRY(tmpfs_node) tn_entries;
+ /*
+ * Doubly-linked list entry which links all existing nodes for
+ * a single file system. This is provided to ease the removal
+ * of all nodes during the unmount operation, and to support
+ * the implementation of VOP_VNTOCNP().
+ */
+ LIST_ENTRY(tmpfs_node) tn_entries; /* (m) */
- /* The node's type. Any of 'VBLK', 'VCHR', 'VDIR', 'VFIFO',
+ /*
+ * The node's type. Any of 'VBLK', 'VCHR', 'VDIR', 'VFIFO',
* 'VLNK', 'VREG' and 'VSOCK' is allowed. The usage of vnode
* types instead of a custom enumeration is to make things simpler
- * and faster, as we do not need to convert between two types. */
- enum vtype tn_type;
+ * and faster, as we do not need to convert between two types.
+ */
+ enum vtype tn_type; /* (c) */
/* Node identifier. */
- ino_t tn_id;
+ ino_t tn_id; /* (c) */
- /* Node's internal status. This is used by several file system
+ /*
+ * Node's internal status. This is used by several file system
* operations to do modifications to the node in a delayed
- * fashion. */
- int tn_status;
+ * fashion.
+ */
+ int tn_status; /* (vi) */
#define TMPFS_NODE_ACCESSED (1 << 1)
#define TMPFS_NODE_MODIFIED (1 << 2)
#define TMPFS_NODE_CHANGED (1 << 3)
- /* The node size. It does not necessarily match the real amount
- * of memory consumed by it. */
- off_t tn_size;
+ /*
+ * The node size. It does not necessarily match the real amount
+ * of memory consumed by it.
+ */
+ off_t tn_size; /* (v) */
/* Generic node attributes. */
- uid_t tn_uid;
- gid_t tn_gid;
- mode_t tn_mode;
- u_long tn_flags;
- nlink_t tn_links;
- struct timespec tn_atime;
- struct timespec tn_mtime;
- struct timespec tn_ctime;
- struct timespec tn_birthtime;
- unsigned long tn_gen;
+ uid_t tn_uid; /* (v) */
+ gid_t tn_gid; /* (v) */
+ mode_t tn_mode; /* (v) */
+ u_long tn_flags; /* (v) */
+ nlink_t tn_links; /* (v) */
+ struct timespec tn_atime; /* (vi) */
+ struct timespec tn_mtime; /* (vi) */
+ struct timespec tn_ctime; /* (vi) */
+ struct timespec tn_birthtime; /* (v) */
+ unsigned long tn_gen; /* (c) */
- /* As there is a single vnode for each active file within the
+ /*
+ * As there is a single vnode for each active file within the
* system, care has to be taken to avoid allocating more than one
* vnode per file. In order to do this, a bidirectional association
* is kept between vnodes and nodes.
@@ -196,70 +215,81 @@ struct tmpfs_node {
* tn_vnode.
*
* May be NULL when the node is unused (that is, no vnode has been
- * allocated for it or it has been reclaimed). */
- struct vnode * tn_vnode;
+ * allocated for it or it has been reclaimed).
+ */
+ struct vnode * tn_vnode; /* (i) */
- /* Interlock to protect tn_vpstate, and tn_status under shared
+ /*
+ * Interlock to protect tn_vpstate, and tn_status under shared
* vnode lock.
*/
struct mtx tn_interlock;
- /* Identify if current node has vnode assiocate with
+ /*
+ * Identify if current node has vnode assiocate with
* or allocating vnode.
*/
- int tn_vpstate;
+ int tn_vpstate; /* (i) */
/* misc data field for different tn_type node */
union {
/* Valid when tn_type == VBLK || tn_type == VCHR. */
- dev_t tn_rdev;
+ dev_t tn_rdev; /* (c) */
/* Valid when tn_type == VDIR. */
struct tn_dir {
- /* Pointer to the parent directory. The root
+ /*
+ * Pointer to the parent directory. The root
* directory has a pointer to itself in this field;
- * this property identifies the root node. */
+ * this property identifies the root node.
+ */
struct tmpfs_node * tn_parent;
- /* Head of a tree that links the contents of
- * the directory together. */
+ /*
+ * Head of a tree that links the contents of
+ * the directory together.
+ */
struct tmpfs_dir tn_dirhead;
- /* Head of a list the contains fake directory entries
+ /*
+ * Head of a list the contains fake directory entries
* heads, i.e. entries with TMPFS_DIRCOOKIE_DUPHEAD
- * flag. */
+ * flag.
+ */
struct tmpfs_dir_duphead tn_dupindex;
- /* Number and pointer of the first directory entry
+ /*
+ * Number and pointer of the first directory entry
* returned by the readdir operation if it were
* called again to continue reading data from the
* same directory as before. This is used to speed
* up reads of long directories, assuming that no
* more than one read is in progress at a given time.
- * Otherwise, these values are discarded. */
+ * Otherwise, these values are discarded.
+ */
off_t tn_readdir_lastn;
struct tmpfs_dirent * tn_readdir_lastp;
} tn_dir;
/* Valid when tn_type == VLNK. */
/* The link's target, allocated from a string pool. */
- char * tn_link;
+ char * tn_link; /* (c) */
/* Valid when tn_type == VREG. */
struct tn_reg {
- /* The contents of regular files stored in a tmpfs
- * file system are represented by a single anonymous
- * memory object (aobj, for short). The aobj provides
- * direct access to any position within the file,
- * because its contents are always mapped in a
- * contiguous region of virtual memory. It is a task
- * of the memory management subsystem (see uvm(9)) to
- * issue the required page ins or page outs whenever
- * a position within the file is accessed. */
- vm_object_t tn_aobj;
-
- }tn_reg;
- }tn_spec;
+ /*
+ * The contents of regular files stored in a
+ * tmpfs file system are represented by a
+ * single anonymous memory object (aobj, for
+ * short). The aobj provides direct access to
+ * any position within the file. It is a task
+ * of the memory management subsystem to issue
+ * the required page ins or page outs whenever
+ * a position within the file is accessed.
+ */
+ vm_object_t tn_aobj; /* (c) */
+ } tn_reg;
+ } tn_spec; /* (v) */
};
LIST_HEAD(tmpfs_node_list, tmpfs_node);
@@ -303,26 +333,32 @@ LIST_HEAD(tmpfs_node_list, tmpfs_node);
* Internal representation of a tmpfs mount point.
*/
struct tmpfs_mount {
- /* Maximum number of memory pages available for use by the file
+ /*
+ * Maximum number of memory pages available for use by the file
* system, set during mount time. This variable must never be
* used directly as it may be bigger than the current amount of
* free memory; in the extreme case, it will hold the ULONG_MAX
- * value. */
+ * value.
+ */
u_long tm_pages_max;
/* Number of pages in use by the file system. */
u_long tm_pages_used;
- /* Pointer to the node representing the root directory of this
- * file system. */
+ /*
+ * Pointer to the node representing the root directory of this
+ * file system.
+ */
struct tmpfs_node * tm_root;
- /* Maximum number of possible nodes for this file system; set
+ /*
+ * Maximum number of possible nodes for this file system; set
* during mount time. We need a hard limit on the maximum number
* of nodes to avoid allocating too much of them; their objects
* cannot be released until the file system is unmounted.
* Otherwise, we could easily run out of memory by creating lots
- * of empty files and then simply removing them. */
+ * of empty files and then simply removing them.
+ */
ino_t tm_nodes_max;
/* unrhdr used to allocate inode numbers */
@@ -334,27 +370,16 @@ struct tmpfs_mount {
/* maximum representable file size */
u_int64_t tm_maxfilesize;
- /* Nodes are organized in two different lists. The used list
- * contains all nodes that are currently used by the file system;
- * i.e., they refer to existing files. The available list contains
- * all nodes that are currently available for use by new files.
- * Nodes must be kept in this list (instead of deleting them)
- * because we need to keep track of their generation number (tn_gen
- * field).
- *
- * Note that nodes are lazily allocated: if the available list is
- * empty and we have enough space to create more nodes, they will be
- * created and inserted in the used list. Once these are released,
- * they will go into the available list, remaining alive until the
- * file system is unmounted. */
+ /*
+ * The used list contains all nodes that are currently used by
+ * the file system; i.e., they refer to existing files.
+ */
struct tmpfs_node_list tm_nodes_used;
- /* All node lock to protect the node list and tmp_pages_used */
+ /* All node lock to protect the node list and tmp_pages_used. */
struct mtx allnode_lock;
- /* Pools used to store file system meta data. These are not shared
- * across several instances of tmpfs for the reasons described in
- * tmpfs_pool.c. */
+ /* Zones used to store file system meta data, per tmpfs mount. */
uma_zone_t tm_dirent_pool;
uma_zone_t tm_node_pool;
@@ -444,10 +469,6 @@ int tmpfs_truncate(struct vnode *, off_t
} while (0)
/*
- * Memory management stuff.
- */
-
-/*
* Amount of memory pages to reserve for the system (e.g., to not use by
* tmpfs).
*/
@@ -464,37 +485,34 @@ size_t tmpfs_pages_used(struct tmpfs_mou
* specific ones.
*/
-static inline
-struct tmpfs_mount *
+static inline struct tmpfs_mount *
VFS_TO_TMPFS(struct mount *mp)
{
struct tmpfs_mount *tmp;
- MPASS((mp) != NULL && (mp)->mnt_data != NULL);
- tmp = (struct tmpfs_mount *)(mp)->mnt_data;
- return tmp;
+ MPASS(mp != NULL && mp->mnt_data != NULL);
+ tmp = (struct tmpfs_mount *)mp->mnt_data;
+ return (tmp);
}
-static inline
-struct tmpfs_node *
+static inline struct tmpfs_node *
VP_TO_TMPFS_NODE(struct vnode *vp)
{
struct tmpfs_node *node;
- MPASS((vp) != NULL && (vp)->v_data != NULL);
+ MPASS(vp != NULL && vp->v_data != NULL);
node = (struct tmpfs_node *)vp->v_data;
- return node;
+ return (node);
}
-static inline
-struct tmpfs_node *
+static inline struct tmpfs_node *
VP_TO_TMPFS_DIR(struct vnode *vp)
{
struct tmpfs_node *node;
node = VP_TO_TMPFS_NODE(vp);
TMPFS_VALIDATE_DIR(node);
- return node;
+ return (node);
}
#endif /* _FS_TMPFS_TMPFS_H_ */
Modified: stable/10/sys/fs/tmpfs/tmpfs_subr.c
==============================================================================
--- stable/10/sys/fs/tmpfs/tmpfs_subr.c Thu Jan 26 10:47:05 2017
(r312802)
+++ stable/10/sys/fs/tmpfs/tmpfs_subr.c Thu Jan 26 10:49:45 2017
(r312803)
@@ -198,8 +198,8 @@ tmpfs_alloc_node(struct mount *mp, struc
return (EBUSY);
}
- nnode = (struct tmpfs_node *)uma_zalloc_arg(
- tmp->tm_node_pool, tmp, M_WAITOK);
+ nnode = (struct tmpfs_node *)uma_zalloc_arg(tmp->tm_node_pool, tmp,
+ M_WAITOK);
/* Generic initialization. */
nnode->tn_type = type;
@@ -257,7 +257,8 @@ tmpfs_alloc_node(struct mount *mp, struc
break;
default:
- panic("tmpfs_alloc_node: type %p %d", nnode,
(int)nnode->tn_type);
+ panic("tmpfs_alloc_node: type %p %d", nnode,
+ (int)nnode->tn_type);
}
TMPFS_LOCK(tmp);
@@ -266,25 +267,12 @@ tmpfs_alloc_node(struct mount *mp, struc
TMPFS_UNLOCK(tmp);
*node = nnode;
- return 0;
+ return (0);
}
/*
* Destroys the node pointed to by node from the file system 'tmp'.
- * If the node does not belong to the given mount point, the results are
- * unpredicted.
- *
- * If the node references a directory; no entries are allowed because
- * their removal could need a recursive algorithm, something forbidden in
- * kernel space. Furthermore, there is not need to provide such
- * functionality (recursive removal) because the only primitives offered
- * to the user are the removal of empty directories and the deletion of
- * individual files.
- *
- * Note that nodes are not really deleted; in fact, when a node has been
- * allocated, it cannot be deleted during the whole life of the file
- * system. Instead, they are moved to the available list and remain there
- * until reused.
+ * If the node references a directory, no entries are allowed.
*/
void
tmpfs_free_node(struct tmpfs_mount *tmp, struct tmpfs_node *node)
@@ -609,7 +597,7 @@ loop1:
VN_LOCK_ASHARE(vp);
error = insmntque1(vp, mp, tmpfs_insmntque_dtr, NULL);
- if (error)
+ if (error != 0)
vp = NULL;
unlock:
@@ -638,7 +626,7 @@ out:
}
#endif
- return error;
+ return (error);
}
/*
@@ -706,8 +694,8 @@ tmpfs_alloc_file(struct vnode *dvp, stru
/* Allocate a node that represents the new file. */
error = tmpfs_alloc_node(dvp->v_mount, tmp, vap->va_type,
- cnp->cn_cred->cr_uid,
- dnode->tn_gid, vap->va_mode, parent, target, vap->va_rdev, &node);
+ cnp->cn_cred->cr_uid, dnode->tn_gid, vap->va_mode, parent,
+ target, vap->va_rdev, &node);
if (error != 0)
return (error);
@@ -1115,9 +1103,8 @@ tmpfs_dir_getdotdotdent(struct tmpfs_nod
* Return ENOENT if the current node is already removed.
*/
TMPFS_ASSERT_LOCKED(node);
- if (node->tn_dir.tn_parent == NULL) {
+ if (node->tn_dir.tn_parent == NULL)
return (ENOENT);
- }
TMPFS_NODE_LOCK(node->tn_dir.tn_parent);
dent.d_fileno = node->tn_dir.tn_parent->tn_id;
Modified: stable/10/sys/fs/tmpfs/tmpfs_vfsops.c
==============================================================================
--- stable/10/sys/fs/tmpfs/tmpfs_vfsops.c Thu Jan 26 10:47:05 2017
(r312802)
+++ stable/10/sys/fs/tmpfs/tmpfs_vfsops.c Thu Jan 26 10:49:45 2017
(r312803)
@@ -189,7 +189,7 @@ tmpfs_mount(struct mount *mp)
/* Do not allow mounts if we do not have enough memory to preserve
* the minimum reserved pages. */
if (tmpfs_mem_avail() < TMPFS_PAGES_MINRESERVED)
- return ENOSPC;
+ return (ENOSPC);
/* Get the maximum number of memory pages this file system is
* allowed to use, based on the maximum size the user passed in
@@ -228,27 +228,23 @@ tmpfs_mount(struct mount *mp)
tmp->tm_pages_used = 0;
tmp->tm_ino_unr = new_unrhdr(2, INT_MAX, &tmp->allnode_lock);
tmp->tm_dirent_pool = uma_zcreate("TMPFS dirent",
- sizeof(struct tmpfs_dirent),
- NULL, NULL, NULL, NULL,
+ sizeof(struct tmpfs_dirent), NULL, NULL, NULL, NULL,
UMA_ALIGN_PTR, 0);
tmp->tm_node_pool = uma_zcreate("TMPFS node",
- sizeof(struct tmpfs_node),
- tmpfs_node_ctor, tmpfs_node_dtor,
- tmpfs_node_init, tmpfs_node_fini,
- UMA_ALIGN_PTR, 0);
+ sizeof(struct tmpfs_node), tmpfs_node_ctor, tmpfs_node_dtor,
+ tmpfs_node_init, tmpfs_node_fini, UMA_ALIGN_PTR, 0);
tmp->tm_ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
/* Allocate the root node. */
- error = tmpfs_alloc_node(mp, tmp, VDIR, root_uid,
- root_gid, root_mode & ALLPERMS, NULL, NULL,
- VNOVAL, &root);
+ error = tmpfs_alloc_node(mp, tmp, VDIR, root_uid, root_gid,
+ root_mode & ALLPERMS, NULL, NULL, VNOVAL, &root);
if (error != 0 || root == NULL) {
- uma_zdestroy(tmp->tm_node_pool);
- uma_zdestroy(tmp->tm_dirent_pool);
- delete_unrhdr(tmp->tm_ino_unr);
- free(tmp, M_TMPFSMNT);
- return error;
+ uma_zdestroy(tmp->tm_node_pool);
+ uma_zdestroy(tmp->tm_dirent_pool);
+ delete_unrhdr(tmp->tm_ino_unr);
+ free(tmp, M_TMPFSMNT);
+ return (error);
}
KASSERT(root->tn_id == 2,
("tmpfs root with invalid ino: %ju", (uintmax_t)root->tn_id));
@@ -338,12 +334,11 @@ static int
tmpfs_root(struct mount *mp, int flags, struct vnode **vpp)
{
int error;
- error = tmpfs_alloc_vp(mp, VFS_TO_TMPFS(mp)->tm_root, flags, vpp);
- if (!error)
+ error = tmpfs_alloc_vp(mp, VFS_TO_TMPFS(mp)->tm_root, flags, vpp);
+ if (error == 0)
(*vpp)->v_vflag |= VV_ROOT;
-
- return error;
+ return (error);
}
static int
Modified: stable/10/sys/fs/tmpfs/tmpfs_vnops.c
==============================================================================
--- stable/10/sys/fs/tmpfs/tmpfs_vnops.c Thu Jan 26 10:47:05 2017
(r312802)
+++ stable/10/sys/fs/tmpfs/tmpfs_vnops.c Thu Jan 26 10:49:45 2017
(r312803)
@@ -117,10 +117,12 @@ tmpfs_lookup(struct vop_cachedlookup_arg
if (de != NULL && de->td_node == NULL)
cnp->cn_flags |= ISWHITEOUT;
if (de == NULL || de->td_node == NULL) {
- /* The entry was not found in the directory.
+ /*
+ * The entry was not found in the directory.
* This is OK if we are creating or renaming an
* entry and are working on the last component of
- * the path name. */
+ * the path name.
+ */
if ((cnp->cn_flags & ISLASTCN) &&
(cnp->cn_nameiop == CREATE || \
cnp->cn_nameiop == RENAME ||
@@ -132,8 +134,10 @@ tmpfs_lookup(struct vop_cachedlookup_arg
if (error != 0)
goto out;
- /* Keep the component name in the buffer for
- * future uses. */
+ /*
+ * Keep the component name in the buffer for
+ * future uses.
+ */
cnp->cn_flags |= SAVENAME;
error = EJUSTRETURN;
@@ -142,14 +146,18 @@ tmpfs_lookup(struct vop_cachedlookup_arg
} else {
struct tmpfs_node *tnode;
- /* The entry was found, so get its associated
- * tmpfs_node. */
+ /*
+ * The entry was found, so get its associated
+ * tmpfs_node.
+ */
tnode = de->td_node;
- /* If we are not at the last path component and
+ /*
+ * If we are not at the last path component and
* found a non-directory or non-link entry (which
* may itself be pointing to a directory), raise
- * an error. */
+ * an error.
+ */
if ((tnode->tn_type != VDIR &&
tnode->tn_type != VLNK) &&
!(cnp->cn_flags & ISLASTCN)) {
@@ -157,9 +165,11 @@ tmpfs_lookup(struct vop_cachedlookup_arg
goto out;
}
- /* If we are deleting or renaming the entry, keep
+ /*
+ * If we are deleting or renaming the entry, keep
* track of its tmpfs_dirent so that it can be
- * easily deleted later. */
+ * easily deleted later.
+ */
if ((cnp->cn_flags & ISLASTCN) &&
(cnp->cn_nameiop == DELETE ||
cnp->cn_nameiop == RENAME)) {
@@ -175,8 +185,9 @@ tmpfs_lookup(struct vop_cachedlookup_arg
goto out;
if ((dnode->tn_mode & S_ISTXT) &&
- VOP_ACCESS(dvp, VADMIN, cnp->cn_cred,
cnp->cn_thread) &&
- VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred,
cnp->cn_thread)) {
+ VOP_ACCESS(dvp, VADMIN, cnp->cn_cred,
+ cnp->cn_thread) && VOP_ACCESS(*vpp, VADMIN,
+ cnp->cn_cred, cnp->cn_thread)) {
error = EPERM;
vput(*vpp);
*vpp = NULL;
@@ -192,18 +203,22 @@ tmpfs_lookup(struct vop_cachedlookup_arg
}
}
- /* Store the result of this lookup in the cache. Avoid this if the
+ /*
+ * Store the result of this lookup in the cache. Avoid this if the
* request was for creation, as it does not improve timings on
- * emprical tests. */
+ * emprical tests.
+ */
if ((cnp->cn_flags & MAKEENTRY) != 0)
cache_enter(dvp, *vpp, cnp);
out:
- /* If there were no errors, *vpp cannot be null and it must be
- * locked. */
+ /*
+ * If there were no errors, *vpp cannot be null and it must be
+ * locked.
+ */
MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp)));
- return error;
+ return (error);
}
static int
@@ -1386,7 +1401,7 @@ tmpfs_whiteout(struct vop_whiteout_args
}
/*
- * vnode operations vector used for files stored in a tmpfs file system.
+ * Vnode operations vector used for files stored in a tmpfs file system.
*/
struct vop_vector tmpfs_vnodeop_entries = {
.vop_default = &default_vnodeops,
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