From: Dave Chinner <dchinner@xxxxxxxxxx>
Now that xfs_inode.[ch] is no long shared with userspace, we can
start repopulating them with core kernel inode code such as locking
functions and the kernel struct xfs_inode definitions. From this
point onwards, xfs_inode.[ch] is purely for in-kernel inode specific
infrastructure. High level kernel only operations will slowly
migrate and merge with xfs_iops.c, so xfs_inode.[ch] really only
should gather core functions that are shared by other kernel-only
code.
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
---
fs/xfs/xfs_inode.c | 434 ++++++++++++++++++++++++++++++++++++++++++++++--
fs/xfs/xfs_inode.h | 134 ++++++++++++++-
fs/xfs/xfs_inode_ops.c | 415 ---------------------------------------------
fs/xfs/xfs_inode_ops.h | 64 -------
4 files changed, 545 insertions(+), 502 deletions(-)
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index c032da6..25706c7 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -15,36 +15,434 @@
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include <linux/log2.h>
-
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_log.h"
-#include "xfs_inum.h"
#include "xfs_trans.h"
-#include "xfs_trans_priv.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
-#include "xfs_alloc_btree.h"
-#include "xfs_ialloc_btree.h"
-#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
-#include "xfs_buf_item.h"
-#include "xfs_inode_item.h"
-#include "xfs_btree.h"
-#include "xfs_alloc.h"
-#include "xfs_ialloc.h"
-#include "xfs_bmap.h"
-#include "xfs_error.h"
-#include "xfs_quota.h"
-#include "xfs_filestream.h"
-#include "xfs_cksum.h"
#include "xfs_trace.h"
-#include "xfs_icache.h"
+
+/* Kernel only core inode infrastructure */
kmem_zone_t *xfs_inode_zone;
+/*
+ * This is a wrapper routine around the xfs_ilock() routine used to centralize
+ * some grungy code. It is used in places that wish to lock the inode solely
+ * for reading the extents. The reason these places can't just call
+ * xfs_ilock(SHARED) is that the inode lock also guards to bringing in of the
+ * extents from disk for a file in b-tree format. If the inode is in b-tree
+ * format, then we need to lock the inode exclusively until the extents are read
+ * in. Locking it exclusively all the time would limit our parallelism
+ * unnecessarily, though. What we do instead is check to see if the extents
+ * have been read in yet, and only lock the inode exclusively if they have not.
+ *
+ * The function returns a value which should be given to the corresponding
+ * xfs_iunlock_map_shared(). This value is the mode in which the lock was
+ * actually taken.
+ */
+uint
+xfs_ilock_map_shared(
+ xfs_inode_t *ip)
+{
+ uint lock_mode;
+
+ if ((ip->i_d.di_format == XFS_DINODE_FMT_BTREE) &&
+ ((ip->i_df.if_flags & XFS_IFEXTENTS) == 0)) {
+ lock_mode = XFS_ILOCK_EXCL;
+ } else {
+ lock_mode = XFS_ILOCK_SHARED;
+ }
+
+ xfs_ilock(ip, lock_mode);
+
+ return lock_mode;
+}
+
+/*
+ * This is simply the unlock routine to go with xfs_ilock_map_shared().
+ * All it does is call xfs_iunlock() with the given lock_mode.
+ */
+void
+xfs_iunlock_map_shared(
+ xfs_inode_t *ip,
+ unsigned int lock_mode)
+{
+ xfs_iunlock(ip, lock_mode);
+}
+
+/*
+ * The xfs inode contains 2 locks: a multi-reader lock called the
+ * i_iolock and a multi-reader lock called the i_lock. This routine
+ * allows either or both of the locks to be obtained.
+ *
+ * The 2 locks should always be ordered so that the IO lock is
+ * obtained first in order to prevent deadlock.
+ *
+ * ip -- the inode being locked
+ * lock_flags -- this parameter indicates the inode's locks
+ * to be locked. It can be:
+ * XFS_IOLOCK_SHARED,
+ * XFS_IOLOCK_EXCL,
+ * XFS_ILOCK_SHARED,
+ * XFS_ILOCK_EXCL,
+ * XFS_IOLOCK_SHARED | XFS_ILOCK_SHARED,
+ * XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL,
+ * XFS_IOLOCK_EXCL | XFS_ILOCK_SHARED,
+ * XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL
+ */
+void
+xfs_ilock(
+ xfs_inode_t *ip,
+ uint lock_flags)
+{
+ trace_xfs_ilock(ip, lock_flags, _RET_IP_);
+
+ /*
+ * You can't set both SHARED and EXCL for the same lock,
+ * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
+ * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
+ */
+ ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
+ (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
+ ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
+ (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
+ ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
+
+ if (lock_flags & XFS_IOLOCK_EXCL)
+ mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
+ else if (lock_flags & XFS_IOLOCK_SHARED)
+ mraccess_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
+
+ if (lock_flags & XFS_ILOCK_EXCL)
+ mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
+ else if (lock_flags & XFS_ILOCK_SHARED)
+ mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
+}
+
+/*
+ * This is just like xfs_ilock(), except that the caller
+ * is guaranteed not to sleep. It returns 1 if it gets
+ * the requested locks and 0 otherwise. If the IO lock is
+ * obtained but the inode lock cannot be, then the IO lock
+ * is dropped before returning.
+ *
+ * ip -- the inode being locked
+ * lock_flags -- this parameter indicates the inode's locks to be
+ * to be locked. See the comment for xfs_ilock() for a list
+ * of valid values.
+ */
+int
+xfs_ilock_nowait(
+ xfs_inode_t *ip,
+ uint lock_flags)
+{
+ trace_xfs_ilock_nowait(ip, lock_flags, _RET_IP_);
+
+ /*
+ * You can't set both SHARED and EXCL for the same lock,
+ * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
+ * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
+ */
+ ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
+ (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
+ ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
+ (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
+ ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
+
+ if (lock_flags & XFS_IOLOCK_EXCL) {
+ if (!mrtryupdate(&ip->i_iolock))
+ goto out;
+ } else if (lock_flags & XFS_IOLOCK_SHARED) {
+ if (!mrtryaccess(&ip->i_iolock))
+ goto out;
+ }
+ if (lock_flags & XFS_ILOCK_EXCL) {
+ if (!mrtryupdate(&ip->i_lock))
+ goto out_undo_iolock;
+ } else if (lock_flags & XFS_ILOCK_SHARED) {
+ if (!mrtryaccess(&ip->i_lock))
+ goto out_undo_iolock;
+ }
+ return 1;
+
+ out_undo_iolock:
+ if (lock_flags & XFS_IOLOCK_EXCL)
+ mrunlock_excl(&ip->i_iolock);
+ else if (lock_flags & XFS_IOLOCK_SHARED)
+ mrunlock_shared(&ip->i_iolock);
+ out:
+ return 0;
+}
+
+/*
+ * xfs_iunlock() is used to drop the inode locks acquired with
+ * xfs_ilock() and xfs_ilock_nowait(). The caller must pass
+ * in the flags given to xfs_ilock() or xfs_ilock_nowait() so
+ * that we know which locks to drop.
+ *
+ * ip -- the inode being unlocked
+ * lock_flags -- this parameter indicates the inode's locks to be
+ * to be unlocked. See the comment for xfs_ilock() for a list
+ * of valid values for this parameter.
+ *
+ */
+void
+xfs_iunlock(
+ xfs_inode_t *ip,
+ uint lock_flags)
+{
+ /*
+ * You can't set both SHARED and EXCL for the same lock,
+ * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
+ * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
+ */
+ ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
+ (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
+ ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
+ (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
+ ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
+ ASSERT(lock_flags != 0);
+
+ if (lock_flags & XFS_IOLOCK_EXCL)
+ mrunlock_excl(&ip->i_iolock);
+ else if (lock_flags & XFS_IOLOCK_SHARED)
+ mrunlock_shared(&ip->i_iolock);
+
+ if (lock_flags & XFS_ILOCK_EXCL)
+ mrunlock_excl(&ip->i_lock);
+ else if (lock_flags & XFS_ILOCK_SHARED)
+ mrunlock_shared(&ip->i_lock);
+
+ trace_xfs_iunlock(ip, lock_flags, _RET_IP_);
+}
+
+/*
+ * give up write locks. the i/o lock cannot be held nested
+ * if it is being demoted.
+ */
+void
+xfs_ilock_demote(
+ xfs_inode_t *ip,
+ uint lock_flags)
+{
+ ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL));
+ ASSERT((lock_flags & ~(XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)) == 0);
+
+ if (lock_flags & XFS_ILOCK_EXCL)
+ mrdemote(&ip->i_lock);
+ if (lock_flags & XFS_IOLOCK_EXCL)
+ mrdemote(&ip->i_iolock);
+
+ trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_);
+}
+
+#if defined(DEBUG) || defined(XFS_WARN)
+int
+xfs_isilocked(
+ xfs_inode_t *ip,
+ uint lock_flags)
+{
+ if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) {
+ if (!(lock_flags & XFS_ILOCK_SHARED))
+ return !!ip->i_lock.mr_writer;
+ return rwsem_is_locked(&ip->i_lock.mr_lock);
+ }
+
+ if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) {
+ if (!(lock_flags & XFS_IOLOCK_SHARED))
+ return !!ip->i_iolock.mr_writer;
+ return rwsem_is_locked(&ip->i_iolock.mr_lock);
+ }
+
+ ASSERT(0);
+ return 0;
+}
+#endif
+
+#ifdef DEBUG
+int xfs_locked_n;
+int xfs_small_retries;
+int xfs_middle_retries;
+int xfs_lots_retries;
+int xfs_lock_delays;
+#endif
+
+/*
+ * Bump the subclass so xfs_lock_inodes() acquires each lock with
+ * a different value
+ */
+static inline int
+xfs_lock_inumorder(int lock_mode, int subclass)
+{
+ if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
+ lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
+ if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
+ lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT;
+
+ return lock_mode;
+}
+
+/*
+ * The following routine will lock n inodes in exclusive mode.
+ * We assume the caller calls us with the inodes in i_ino order.
+ *
+ * We need to detect deadlock where an inode that we lock
+ * is in the AIL and we start waiting for another inode that is locked
+ * by a thread in a long running transaction (such as truncate). This can
+ * result in deadlock since the long running trans might need to wait
+ * for the inode we just locked in order to push the tail and free space
+ * in the log.
+ */
+void
+xfs_lock_inodes(
+ xfs_inode_t **ips,
+ int inodes,
+ uint lock_mode)
+{
+ int attempts = 0, i, j, try_lock;
+ xfs_log_item_t *lp;
+
+ ASSERT(ips && (inodes >= 2)); /* we need at least two */
+
+ try_lock = 0;
+ i = 0;
+
+again:
+ for (; i < inodes; i++) {
+ ASSERT(ips[i]);
+
+ if (i && (ips[i] == ips[i-1])) /* Already locked */
+ continue;
+
+ /*
+ * If try_lock is not set yet, make sure all locked inodes
+ * are not in the AIL.
+ * If any are, set try_lock to be used later.
+ */
+
+ if (!try_lock) {
+ for (j = (i - 1); j >= 0 && !try_lock; j--) {
+ lp = (xfs_log_item_t *)ips[j]->i_itemp;
+ if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
+ try_lock++;
+ }
+ }
+ }
+
+ /*
+ * If any of the previous locks we have locked is in the AIL,
+ * we must TRY to get the second and subsequent locks. If
+ * we can't get any, we must release all we have
+ * and try again.
+ */
+
+ if (try_lock) {
+ /* try_lock must be 0 if i is 0. */
+ /*
+ * try_lock means we have an inode locked
+ * that is in the AIL.
+ */
+ ASSERT(i != 0);
+ if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) {
+ attempts++;
+
+ /*
+ * Unlock all previous guys and try again.
+ * xfs_iunlock will try to push the tail
+ * if the inode is in the AIL.
+ */
+
+ for(j = i - 1; j >= 0; j--) {
+
+ /*
+ * Check to see if we've already
+ * unlocked this one.
+ * Not the first one going back,
+ * and the inode ptr is the same.
+ */
+ if ((j != (i - 1)) && ips[j] ==
+ ips[j+1])
+ continue;
+
+ xfs_iunlock(ips[j], lock_mode);
+ }
+
+ if ((attempts % 5) == 0) {
+ delay(1); /* Don't just spin the CPU */
+#ifdef DEBUG
+ xfs_lock_delays++;
+#endif
+ }
+ i = 0;
+ try_lock = 0;
+ goto again;
+ }
+ } else {
+ xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
+ }
+ }
+
+#ifdef DEBUG
+ if (attempts) {
+ if (attempts < 5) xfs_small_retries++;
+ else if (attempts < 100) xfs_middle_retries++;
+ else xfs_lots_retries++;
+ } else {
+ xfs_locked_n++;
+ }
+#endif
+}
+
+/*
+ * xfs_lock_two_inodes() can only be used to lock one type of lock
+ * at a time - the iolock or the ilock, but not both at once. If
+ * we lock both at once, lockdep will report false positives saying
+ * we have violated locking orders.
+ */
+void
+xfs_lock_two_inodes(
+ xfs_inode_t *ip0,
+ xfs_inode_t *ip1,
+ uint lock_mode)
+{
+ xfs_inode_t *temp;
+ int attempts = 0;
+ xfs_log_item_t *lp;
+
+ if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
+ ASSERT((lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) == 0);
+ ASSERT(ip0->i_ino != ip1->i_ino);
+
+ if (ip0->i_ino > ip1->i_ino) {
+ temp = ip0;
+ ip0 = ip1;
+ ip1 = temp;
+ }
+
+ again:
+ xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0));
+
+ /*
+ * If the first lock we have locked is in the AIL, we must TRY to get
+ * the second lock. If we can't get it, we must release the first one
+ * and try again.
+ */
+ lp = (xfs_log_item_t *)ip0->i_itemp;
+ if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
+ if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) {
+ xfs_iunlock(ip0, lock_mode);
+ if ((++attempts % 5) == 0)
+ delay(1); /* Don't just spin the CPU */
+ goto again;
+ }
+ } else {
+ xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1));
+ }
+}
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 83a8ce3..6afcaa3 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -18,17 +18,141 @@
#ifndef __XFS_INODE_H__
#define __XFS_INODE_H__
-struct xfs_dinode;
-struct xfs_inode;
+//struct xfs_dinode;
+//struct xfs_inode;
#include "xfs_inode_buf.h"
#include "xfs_inode_fork.h"
#include "xfs_inode_item_format.h"
-#ifdef __KERNEL__
+/* kernel only inode definitions */
-#include "xfs_inode_ops.h"
+typedef struct xfs_inode {
+ /* Inode linking and identification information. */
+ struct xfs_mount *i_mount; /* fs mount struct ptr */
+ struct xfs_dquot *i_udquot; /* user dquot */
+ struct xfs_dquot *i_gdquot; /* group dquot */
+
+ /* Inode location stuff */
+ xfs_ino_t i_ino; /* inode number (agno/agino)*/
+ struct xfs_imap i_imap; /* location for xfs_imap() */
+
+ /* Extent information. */
+ struct xfs_ifork *i_afp; /* attribute fork pointer */
+ struct xfs_ifork i_df; /* data fork */
+
+ /* Transaction and locking information. */
+ struct xfs_inode_log_item *i_itemp; /* logging information */
+ mrlock_t i_lock; /* inode lock */
+ mrlock_t i_iolock; /* inode IO lock */
+ atomic_t i_pincount; /* inode pin count */
+ spinlock_t i_flags_lock; /* inode i_flags lock */
+ /* Miscellaneous state. */
+ unsigned long i_flags; /* see defined flags below */
+ unsigned int i_delayed_blks; /* count of delay alloc blks */
+
+ struct xfs_icdinode i_d; /* most of ondisk inode */
+
+ /* VFS inode */
+ struct inode i_vnode; /* embedded VFS inode */
+} xfs_inode_t;
+
+/* Convert from vfs inode to xfs inode */
+static inline struct xfs_inode *XFS_I(struct inode *inode)
+{
+ return container_of(inode, struct xfs_inode, i_vnode);
+}
+
+/* convert from xfs inode to vfs inode */
+static inline struct inode *VFS_I(struct xfs_inode *ip)
+{
+ return &ip->i_vnode;
+}
+
+/*
+ * For regular files we only update the on-disk filesize when actually
+ * writing data back to disk. Until then only the copy in the VFS inode
+ * is uptodate.
+ */
+static inline xfs_fsize_t XFS_ISIZE(struct xfs_inode *ip)
+{
+ if (S_ISREG(ip->i_d.di_mode))
+ return i_size_read(VFS_I(ip));
+ return ip->i_d.di_size;
+}
+
+/*
+ * Flags for inode locking.
+ * Bit ranges: 1<<1 - 1<<16-1 -- iolock/ilock modes (bitfield)
+ * 1<<16 - 1<<32-1 -- lockdep annotation (integers)
+ */
+#define XFS_IOLOCK_EXCL (1<<0)
+#define XFS_IOLOCK_SHARED (1<<1)
+#define XFS_ILOCK_EXCL (1<<2)
+#define XFS_ILOCK_SHARED (1<<3)
+
+#define XFS_LOCK_MASK (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
+ | XFS_ILOCK_EXCL | XFS_ILOCK_SHARED)
-#endif /* __KERNEL__ */
+#define XFS_LOCK_FLAGS \
+ { XFS_IOLOCK_EXCL, "IOLOCK_EXCL" }, \
+ { XFS_IOLOCK_SHARED, "IOLOCK_SHARED" }, \
+ { XFS_ILOCK_EXCL, "ILOCK_EXCL" }, \
+ { XFS_ILOCK_SHARED, "ILOCK_SHARED" }
+
+
+/*
+ * Flags for lockdep annotations.
+ *
+ * XFS_LOCK_PARENT - for directory operations that require locking a
+ * parent directory inode and a child entry inode. The parent gets locked
+ * with this flag so it gets a lockdep subclass of 1 and the child entry
+ * lock will have a lockdep subclass of 0.
+ *
+ * XFS_LOCK_RTBITMAP/XFS_LOCK_RTSUM - the realtime device bitmap and summary
+ * inodes do not participate in the normal lock order, and thus have their
+ * own subclasses.
+ *
+ * XFS_LOCK_INUMORDER - for locking several inodes at the some time
+ * with xfs_lock_inodes(). This flag is used as the starting subclass
+ * and each subsequent lock acquired will increment the subclass by one.
+ * So the first lock acquired will have a lockdep subclass of 4, the
+ * second lock will have a lockdep subclass of 5, and so on. It is
+ * the responsibility of the class builder to shift this to the correct
+ * portion of the lock_mode lockdep mask.
+ */
+#define XFS_LOCK_PARENT 1
+#define XFS_LOCK_RTBITMAP 2
+#define XFS_LOCK_RTSUM 3
+#define XFS_LOCK_INUMORDER 4
+
+#define XFS_IOLOCK_SHIFT 16
+#define XFS_IOLOCK_PARENT (XFS_LOCK_PARENT << XFS_IOLOCK_SHIFT)
+
+#define XFS_ILOCK_SHIFT 24
+#define XFS_ILOCK_PARENT (XFS_LOCK_PARENT << XFS_ILOCK_SHIFT)
+#define XFS_ILOCK_RTBITMAP (XFS_LOCK_RTBITMAP << XFS_ILOCK_SHIFT)
+#define XFS_ILOCK_RTSUM (XFS_LOCK_RTSUM << XFS_ILOCK_SHIFT)
+
+#define XFS_IOLOCK_DEP_MASK 0x00ff0000
+#define XFS_ILOCK_DEP_MASK 0xff000000
+#define XFS_LOCK_DEP_MASK (XFS_IOLOCK_DEP_MASK | XFS_ILOCK_DEP_MASK)
+
+#define XFS_IOLOCK_DEP(flags) (((flags) & XFS_IOLOCK_DEP_MASK) >> XFS_IOLOCK_SHIFT)
+#define XFS_ILOCK_DEP(flags) (((flags) & XFS_ILOCK_DEP_MASK) >> XFS_ILOCK_SHIFT)
+
+void xfs_ilock(xfs_inode_t *, uint);
+int xfs_ilock_nowait(xfs_inode_t *, uint);
+void xfs_iunlock(xfs_inode_t *, uint);
+void xfs_ilock_demote(xfs_inode_t *, uint);
+int xfs_isilocked(xfs_inode_t *, uint);
+uint xfs_ilock_map_shared(xfs_inode_t *);
+void xfs_iunlock_map_shared(xfs_inode_t *, uint);
+void xfs_lock_inodes(xfs_inode_t **, int, uint);
+void xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint);
+
+extern struct kmem_zone *xfs_inode_zone;
+
+#include "xfs_inode_ops.h"
#endif /* __XFS_INODE_H__ */
diff --git a/fs/xfs/xfs_inode_ops.c b/fs/xfs/xfs_inode_ops.c
index 7a7f19d..b4d6948 100644
--- a/fs/xfs/xfs_inode_ops.c
+++ b/fs/xfs/xfs_inode_ops.c
@@ -72,421 +72,6 @@ xfs_get_extsz_hint(
return 0;
}
-/*
- * This is a wrapper routine around the xfs_ilock() routine used to centralize
- * some grungy code. It is used in places that wish to lock the inode solely
- * for reading the extents. The reason these places can't just call
- * xfs_ilock(SHARED) is that the inode lock also guards to bringing in of the
- * extents from disk for a file in b-tree format. If the inode is in b-tree
- * format, then we need to lock the inode exclusively until the extents are read
- * in. Locking it exclusively all the time would limit our parallelism
- * unnecessarily, though. What we do instead is check to see if the extents
- * have been read in yet, and only lock the inode exclusively if they have not.
- *
- * The function returns a value which should be given to the corresponding
- * xfs_iunlock_map_shared(). This value is the mode in which the lock was
- * actually taken.
- */
-uint
-xfs_ilock_map_shared(
- xfs_inode_t *ip)
-{
- uint lock_mode;
-
- if ((ip->i_d.di_format == XFS_DINODE_FMT_BTREE) &&
- ((ip->i_df.if_flags & XFS_IFEXTENTS) == 0)) {
- lock_mode = XFS_ILOCK_EXCL;
- } else {
- lock_mode = XFS_ILOCK_SHARED;
- }
-
- xfs_ilock(ip, lock_mode);
-
- return lock_mode;
-}
-
-/*
- * This is simply the unlock routine to go with xfs_ilock_map_shared().
- * All it does is call xfs_iunlock() with the given lock_mode.
- */
-void
-xfs_iunlock_map_shared(
- xfs_inode_t *ip,
- unsigned int lock_mode)
-{
- xfs_iunlock(ip, lock_mode);
-}
-
-/*
- * The xfs inode contains 2 locks: a multi-reader lock called the
- * i_iolock and a multi-reader lock called the i_lock. This routine
- * allows either or both of the locks to be obtained.
- *
- * The 2 locks should always be ordered so that the IO lock is
- * obtained first in order to prevent deadlock.
- *
- * ip -- the inode being locked
- * lock_flags -- this parameter indicates the inode's locks
- * to be locked. It can be:
- * XFS_IOLOCK_SHARED,
- * XFS_IOLOCK_EXCL,
- * XFS_ILOCK_SHARED,
- * XFS_ILOCK_EXCL,
- * XFS_IOLOCK_SHARED | XFS_ILOCK_SHARED,
- * XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL,
- * XFS_IOLOCK_EXCL | XFS_ILOCK_SHARED,
- * XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL
- */
-void
-xfs_ilock(
- xfs_inode_t *ip,
- uint lock_flags)
-{
- trace_xfs_ilock(ip, lock_flags, _RET_IP_);
-
- /*
- * You can't set both SHARED and EXCL for the same lock,
- * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
- * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
- */
- ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
- (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
- ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
- (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
- ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
-
- if (lock_flags & XFS_IOLOCK_EXCL)
- mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
- else if (lock_flags & XFS_IOLOCK_SHARED)
- mraccess_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
-
- if (lock_flags & XFS_ILOCK_EXCL)
- mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
- else if (lock_flags & XFS_ILOCK_SHARED)
- mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
-}
-
-/*
- * This is just like xfs_ilock(), except that the caller
- * is guaranteed not to sleep. It returns 1 if it gets
- * the requested locks and 0 otherwise. If the IO lock is
- * obtained but the inode lock cannot be, then the IO lock
- * is dropped before returning.
- *
- * ip -- the inode being locked
- * lock_flags -- this parameter indicates the inode's locks to be
- * to be locked. See the comment for xfs_ilock() for a list
- * of valid values.
- */
-int
-xfs_ilock_nowait(
- xfs_inode_t *ip,
- uint lock_flags)
-{
- trace_xfs_ilock_nowait(ip, lock_flags, _RET_IP_);
-
- /*
- * You can't set both SHARED and EXCL for the same lock,
- * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
- * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
- */
- ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
- (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
- ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
- (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
- ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
-
- if (lock_flags & XFS_IOLOCK_EXCL) {
- if (!mrtryupdate(&ip->i_iolock))
- goto out;
- } else if (lock_flags & XFS_IOLOCK_SHARED) {
- if (!mrtryaccess(&ip->i_iolock))
- goto out;
- }
- if (lock_flags & XFS_ILOCK_EXCL) {
- if (!mrtryupdate(&ip->i_lock))
- goto out_undo_iolock;
- } else if (lock_flags & XFS_ILOCK_SHARED) {
- if (!mrtryaccess(&ip->i_lock))
- goto out_undo_iolock;
- }
- return 1;
-
- out_undo_iolock:
- if (lock_flags & XFS_IOLOCK_EXCL)
- mrunlock_excl(&ip->i_iolock);
- else if (lock_flags & XFS_IOLOCK_SHARED)
- mrunlock_shared(&ip->i_iolock);
- out:
- return 0;
-}
-
-/*
- * xfs_iunlock() is used to drop the inode locks acquired with
- * xfs_ilock() and xfs_ilock_nowait(). The caller must pass
- * in the flags given to xfs_ilock() or xfs_ilock_nowait() so
- * that we know which locks to drop.
- *
- * ip -- the inode being unlocked
- * lock_flags -- this parameter indicates the inode's locks to be
- * to be unlocked. See the comment for xfs_ilock() for a list
- * of valid values for this parameter.
- *
- */
-void
-xfs_iunlock(
- xfs_inode_t *ip,
- uint lock_flags)
-{
- /*
- * You can't set both SHARED and EXCL for the same lock,
- * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
- * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
- */
- ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
- (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
- ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
- (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
- ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
- ASSERT(lock_flags != 0);
-
- if (lock_flags & XFS_IOLOCK_EXCL)
- mrunlock_excl(&ip->i_iolock);
- else if (lock_flags & XFS_IOLOCK_SHARED)
- mrunlock_shared(&ip->i_iolock);
-
- if (lock_flags & XFS_ILOCK_EXCL)
- mrunlock_excl(&ip->i_lock);
- else if (lock_flags & XFS_ILOCK_SHARED)
- mrunlock_shared(&ip->i_lock);
-
- trace_xfs_iunlock(ip, lock_flags, _RET_IP_);
-}
-
-/*
- * give up write locks. the i/o lock cannot be held nested
- * if it is being demoted.
- */
-void
-xfs_ilock_demote(
- xfs_inode_t *ip,
- uint lock_flags)
-{
- ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL));
- ASSERT((lock_flags & ~(XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)) == 0);
-
- if (lock_flags & XFS_ILOCK_EXCL)
- mrdemote(&ip->i_lock);
- if (lock_flags & XFS_IOLOCK_EXCL)
- mrdemote(&ip->i_iolock);
-
- trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_);
-}
-
-#if defined(DEBUG) || defined(XFS_WARN)
-int
-xfs_isilocked(
- xfs_inode_t *ip,
- uint lock_flags)
-{
- if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) {
- if (!(lock_flags & XFS_ILOCK_SHARED))
- return !!ip->i_lock.mr_writer;
- return rwsem_is_locked(&ip->i_lock.mr_lock);
- }
-
- if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) {
- if (!(lock_flags & XFS_IOLOCK_SHARED))
- return !!ip->i_iolock.mr_writer;
- return rwsem_is_locked(&ip->i_iolock.mr_lock);
- }
-
- ASSERT(0);
- return 0;
-}
-#endif
-
-#ifdef DEBUG
-int xfs_locked_n;
-int xfs_small_retries;
-int xfs_middle_retries;
-int xfs_lots_retries;
-int xfs_lock_delays;
-#endif
-
-/*
- * Bump the subclass so xfs_lock_inodes() acquires each lock with
- * a different value
- */
-static inline int
-xfs_lock_inumorder(int lock_mode, int subclass)
-{
- if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
- lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
- if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
- lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT;
-
- return lock_mode;
-}
-
-/*
- * The following routine will lock n inodes in exclusive mode.
- * We assume the caller calls us with the inodes in i_ino order.
- *
- * We need to detect deadlock where an inode that we lock
- * is in the AIL and we start waiting for another inode that is locked
- * by a thread in a long running transaction (such as truncate). This can
- * result in deadlock since the long running trans might need to wait
- * for the inode we just locked in order to push the tail and free space
- * in the log.
- */
-void
-xfs_lock_inodes(
- xfs_inode_t **ips,
- int inodes,
- uint lock_mode)
-{
- int attempts = 0, i, j, try_lock;
- xfs_log_item_t *lp;
-
- ASSERT(ips && (inodes >= 2)); /* we need at least two */
-
- try_lock = 0;
- i = 0;
-
-again:
- for (; i < inodes; i++) {
- ASSERT(ips[i]);
-
- if (i && (ips[i] == ips[i-1])) /* Already locked */
- continue;
-
- /*
- * If try_lock is not set yet, make sure all locked inodes
- * are not in the AIL.
- * If any are, set try_lock to be used later.
- */
-
- if (!try_lock) {
- for (j = (i - 1); j >= 0 && !try_lock; j--) {
- lp = (xfs_log_item_t *)ips[j]->i_itemp;
- if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
- try_lock++;
- }
- }
- }
-
- /*
- * If any of the previous locks we have locked is in the AIL,
- * we must TRY to get the second and subsequent locks. If
- * we can't get any, we must release all we have
- * and try again.
- */
-
- if (try_lock) {
- /* try_lock must be 0 if i is 0. */
- /*
- * try_lock means we have an inode locked
- * that is in the AIL.
- */
- ASSERT(i != 0);
- if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) {
- attempts++;
-
- /*
- * Unlock all previous guys and try again.
- * xfs_iunlock will try to push the tail
- * if the inode is in the AIL.
- */
-
- for(j = i - 1; j >= 0; j--) {
-
- /*
- * Check to see if we've already
- * unlocked this one.
- * Not the first one going back,
- * and the inode ptr is the same.
- */
- if ((j != (i - 1)) && ips[j] ==
- ips[j+1])
- continue;
-
- xfs_iunlock(ips[j], lock_mode);
- }
-
- if ((attempts % 5) == 0) {
- delay(1); /* Don't just spin the CPU */
-#ifdef DEBUG
- xfs_lock_delays++;
-#endif
- }
- i = 0;
- try_lock = 0;
- goto again;
- }
- } else {
- xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
- }
- }
-
-#ifdef DEBUG
- if (attempts) {
- if (attempts < 5) xfs_small_retries++;
- else if (attempts < 100) xfs_middle_retries++;
- else xfs_lots_retries++;
- } else {
- xfs_locked_n++;
- }
-#endif
-}
-
-/*
- * xfs_lock_two_inodes() can only be used to lock one type of lock
- * at a time - the iolock or the ilock, but not both at once. If
- * we lock both at once, lockdep will report false positives saying
- * we have violated locking orders.
- */
-void
-xfs_lock_two_inodes(
- xfs_inode_t *ip0,
- xfs_inode_t *ip1,
- uint lock_mode)
-{
- xfs_inode_t *temp;
- int attempts = 0;
- xfs_log_item_t *lp;
-
- if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
- ASSERT((lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) == 0);
- ASSERT(ip0->i_ino != ip1->i_ino);
-
- if (ip0->i_ino > ip1->i_ino) {
- temp = ip0;
- ip0 = ip1;
- ip1 = temp;
- }
-
- again:
- xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0));
-
- /*
- * If the first lock we have locked is in the AIL, we must TRY to get
- * the second lock. If we can't get it, we must release the first one
- * and try again.
- */
- lp = (xfs_log_item_t *)ip0->i_itemp;
- if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
- if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) {
- xfs_iunlock(ip0, lock_mode);
- if ((++attempts % 5) == 0)
- delay(1); /* Don't just spin the CPU */
- goto again;
- }
- } else {
- xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1));
- }
-}
-
void
__xfs_iflock(
diff --git a/fs/xfs/xfs_inode_ops.h b/fs/xfs/xfs_inode_ops.h
index ecaa019..b74e544 100644
--- a/fs/xfs/xfs_inode_ops.h
+++ b/fs/xfs/xfs_inode_ops.h
@@ -28,59 +28,6 @@ struct xfs_mount;
struct xfs_trans;
struct xfs_dquot;
-typedef struct xfs_inode {
- /* Inode linking and identification information. */
- struct xfs_mount *i_mount; /* fs mount struct ptr */
- struct xfs_dquot *i_udquot; /* user dquot */
- struct xfs_dquot *i_gdquot; /* group dquot */
-
- /* Inode location stuff */
- xfs_ino_t i_ino; /* inode number (agno/agino)*/
- struct xfs_imap i_imap; /* location for xfs_imap() */
-
- /* Extent information. */
- xfs_ifork_t *i_afp; /* attribute fork pointer */
- xfs_ifork_t i_df; /* data fork */
-
- /* Transaction and locking information. */
- struct xfs_inode_log_item *i_itemp; /* logging information */
- mrlock_t i_lock; /* inode lock */
- mrlock_t i_iolock; /* inode IO lock */
- atomic_t i_pincount; /* inode pin count */
- spinlock_t i_flags_lock; /* inode i_flags lock */
- /* Miscellaneous state. */
- unsigned long i_flags; /* see defined flags below */
- unsigned int i_delayed_blks; /* count of delay alloc blks */
-
- xfs_icdinode_t i_d; /* most of ondisk inode */
-
- /* VFS inode */
- struct inode i_vnode; /* embedded VFS inode */
-} xfs_inode_t;
-
-/* Convert from vfs inode to xfs inode */
-static inline struct xfs_inode *XFS_I(struct inode *inode)
-{
- return container_of(inode, struct xfs_inode, i_vnode);
-}
-
-/* convert from xfs inode to vfs inode */
-static inline struct inode *VFS_I(struct xfs_inode *ip)
-{
- return &ip->i_vnode;
-}
-
-/*
- * For regular files we only update the on-disk filesize when actually
- * writing data back to disk. Until then only the copy in the VFS inode
- * is uptodate.
- */
-static inline xfs_fsize_t XFS_ISIZE(struct xfs_inode *ip)
-{
- if (S_ISREG(ip->i_d.di_mode))
- return i_size_read(VFS_I(ip));
- return ip->i_d.di_size;
-}
/*
* If this I/O goes past the on-disk inode size update it unless it would
@@ -324,13 +271,6 @@ int xfs_rename(struct xfs_inode *src_dp, struct xfs_name *src_name,
int xfs_free_eofblocks(struct xfs_mount *, struct xfs_inode *, bool);
bool xfs_can_free_eofblocks(struct xfs_inode *, bool);
-void xfs_ilock(xfs_inode_t *, uint);
-int xfs_ilock_nowait(xfs_inode_t *, uint);
-void xfs_iunlock(xfs_inode_t *, uint);
-void xfs_ilock_demote(xfs_inode_t *, uint);
-int xfs_isilocked(xfs_inode_t *, uint);
-uint xfs_ilock_map_shared(xfs_inode_t *);
-void xfs_iunlock_map_shared(xfs_inode_t *, uint);
int xfs_ialloc(struct xfs_trans *, xfs_inode_t *, umode_t,
xfs_nlink_t, xfs_dev_t, prid_t, int,
struct xfs_buf **, xfs_inode_t **);
@@ -349,8 +289,6 @@ void xfs_iunpin_wait(xfs_inode_t *);
#define xfs_ipincount(ip) ((unsigned int) atomic_read(&ip->i_pincount))
int xfs_iflush(struct xfs_inode *, struct xfs_buf **);
-void xfs_lock_inodes(xfs_inode_t **, int, uint);
-void xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint);
xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip);
@@ -379,6 +317,4 @@ int xfs_droplink(struct xfs_trans *, struct xfs_inode *);
int xfs_bumplink(struct xfs_trans *, struct xfs_inode *);
void xfs_bump_ino_vers2(struct xfs_trans *, struct xfs_inode *);
-extern struct kmem_zone *xfs_inode_zone;
-
#endif /* __XFS_INODE_OPS_H__ */
--
1.7.10.4
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