Initial import

1 files changed, 456 insertions, 0 deletions

diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
new file mode 100644
index 000000000..8f22d2036
--- /dev/null
+++ b/fs/xfs/xfs_inode.h
@@ -0,0 +1,456 @@
+/*
+ * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#ifndef	__XFS_INODE_H__
+#define	__XFS_INODE_H__
+
+#include "xfs_inode_buf.h"
+#include "xfs_inode_fork.h"
+
+/*
+ * Kernel only inode definitions
+ */
+struct xfs_dinode;
+struct xfs_inode;
+struct xfs_buf;
+struct xfs_bmap_free;
+struct xfs_bmbt_irec;
+struct xfs_inode_log_item;
+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 */
+	struct xfs_dquot	*i_pdquot;	/* project 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 */
+
+	/* operations vectors */
+	const struct xfs_dir_ops *d_ops;		/* directory ops vector */
+
+	/* 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 */
+	mrlock_t		i_mmaplock;	/* inode mmap 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
+ * be past the current in-core inode size.
+ */
+static inline xfs_fsize_t
+xfs_new_eof(struct xfs_inode *ip, xfs_fsize_t new_size)
+{
+	xfs_fsize_t i_size = i_size_read(VFS_I(ip));
+
+	if (new_size > i_size || new_size < 0)
+		new_size = i_size;
+	return new_size > ip->i_d.di_size ? new_size : 0;
+}
+
+/*
+ * i_flags helper functions
+ */
+static inline void
+__xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
+{
+	ip->i_flags |= flags;
+}
+
+static inline void
+xfs_iflags_set(xfs_inode_t *ip, unsigned short flags)
+{
+	spin_lock(&ip->i_flags_lock);
+	__xfs_iflags_set(ip, flags);
+	spin_unlock(&ip->i_flags_lock);
+}
+
+static inline void
+xfs_iflags_clear(xfs_inode_t *ip, unsigned short flags)
+{
+	spin_lock(&ip->i_flags_lock);
+	ip->i_flags &= ~flags;
+	spin_unlock(&ip->i_flags_lock);
+}
+
+static inline int
+__xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
+{
+	return (ip->i_flags & flags);
+}
+
+static inline int
+xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
+{
+	int ret;
+	spin_lock(&ip->i_flags_lock);
+	ret = __xfs_iflags_test(ip, flags);
+	spin_unlock(&ip->i_flags_lock);
+	return ret;
+}
+
+static inline int
+xfs_iflags_test_and_clear(xfs_inode_t *ip, unsigned short flags)
+{
+	int ret;
+
+	spin_lock(&ip->i_flags_lock);
+	ret = ip->i_flags & flags;
+	if (ret)
+		ip->i_flags &= ~flags;
+	spin_unlock(&ip->i_flags_lock);
+	return ret;
+}
+
+static inline int
+xfs_iflags_test_and_set(xfs_inode_t *ip, unsigned short flags)
+{
+	int ret;
+
+	spin_lock(&ip->i_flags_lock);
+	ret = ip->i_flags & flags;
+	if (!ret)
+		ip->i_flags |= flags;
+	spin_unlock(&ip->i_flags_lock);
+	return ret;
+}
+
+/*
+ * Project quota id helpers (previously projid was 16bit only
+ * and using two 16bit values to hold new 32bit projid was chosen
+ * to retain compatibility with "old" filesystems).
+ */
+static inline prid_t
+xfs_get_projid(struct xfs_inode *ip)
+{
+	return (prid_t)ip->i_d.di_projid_hi << 16 | ip->i_d.di_projid_lo;
+}
+
+static inline void
+xfs_set_projid(struct xfs_inode *ip,
+		prid_t projid)
+{
+	ip->i_d.di_projid_hi = (__uint16_t) (projid >> 16);
+	ip->i_d.di_projid_lo = (__uint16_t) (projid & 0xffff);
+}
+
+static inline prid_t
+xfs_get_initial_prid(struct xfs_inode *dp)
+{
+	if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
+		return xfs_get_projid(dp);
+
+	return XFS_PROJID_DEFAULT;
+}
+
+/*
+ * In-core inode flags.
+ */
+#define XFS_IRECLAIM		(1 << 0) /* started reclaiming this inode */
+#define XFS_ISTALE		(1 << 1) /* inode has been staled */
+#define XFS_IRECLAIMABLE	(1 << 2) /* inode can be reclaimed */
+#define XFS_INEW		(1 << 3) /* inode has just been allocated */
+#define XFS_ITRUNCATED		(1 << 5) /* truncated down so flush-on-close */
+#define XFS_IDIRTY_RELEASE	(1 << 6) /* dirty release already seen */
+#define __XFS_IFLOCK_BIT	7	 /* inode is being flushed right now */
+#define XFS_IFLOCK		(1 << __XFS_IFLOCK_BIT)
+#define __XFS_IPINNED_BIT	8	 /* wakeup key for zero pin count */
+#define XFS_IPINNED		(1 << __XFS_IPINNED_BIT)
+#define XFS_IDONTCACHE		(1 << 9) /* don't cache the inode long term */
+
+/*
+ * Per-lifetime flags need to be reset when re-using a reclaimable inode during
+ * inode lookup. This prevents unintended behaviour on the new inode from
+ * ocurring.
+ */
+#define XFS_IRECLAIM_RESET_FLAGS	\
+	(XFS_IRECLAIMABLE | XFS_IRECLAIM | \
+	 XFS_IDIRTY_RELEASE | XFS_ITRUNCATED)
+
+/*
+ * Synchronize processes attempting to flush the in-core inode back to disk.
+ */
+
+extern void __xfs_iflock(struct xfs_inode *ip);
+
+static inline int xfs_iflock_nowait(struct xfs_inode *ip)
+{
+	return !xfs_iflags_test_and_set(ip, XFS_IFLOCK);
+}
+
+static inline void xfs_iflock(struct xfs_inode *ip)
+{
+	if (!xfs_iflock_nowait(ip))
+		__xfs_iflock(ip);
+}
+
+static inline void xfs_ifunlock(struct xfs_inode *ip)
+{
+	xfs_iflags_clear(ip, XFS_IFLOCK);
+	smp_mb();
+	wake_up_bit(&ip->i_flags, __XFS_IFLOCK_BIT);
+}
+
+static inline int xfs_isiflocked(struct xfs_inode *ip)
+{
+	return xfs_iflags_test(ip, XFS_IFLOCK);
+}
+
+/*
+ * 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_MMAPLOCK_EXCL	(1<<4)
+#define	XFS_MMAPLOCK_SHARED	(1<<5)
+
+#define XFS_LOCK_MASK		(XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
+				| XFS_ILOCK_EXCL | XFS_ILOCK_SHARED \
+				| XFS_MMAPLOCK_EXCL | XFS_MMAPLOCK_SHARED)
+
+#define XFS_LOCK_FLAGS \
+	{ XFS_IOLOCK_EXCL,	"IOLOCK_EXCL" }, \
+	{ XFS_IOLOCK_SHARED,	"IOLOCK_SHARED" }, \
+	{ XFS_ILOCK_EXCL,	"ILOCK_EXCL" }, \
+	{ XFS_ILOCK_SHARED,	"ILOCK_SHARED" }, \
+	{ XFS_MMAPLOCK_EXCL,	"MMAPLOCK_EXCL" }, \
+	{ XFS_MMAPLOCK_SHARED,	"MMAPLOCK_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_MMAPLOCK_SHIFT	20
+
+#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	0x000f0000
+#define XFS_MMAPLOCK_DEP_MASK	0x00f00000
+#define XFS_ILOCK_DEP_MASK	0xff000000
+#define XFS_LOCK_DEP_MASK	(XFS_IOLOCK_DEP_MASK | \
+				 XFS_MMAPLOCK_DEP_MASK | \
+				 XFS_ILOCK_DEP_MASK)
+
+#define XFS_IOLOCK_DEP(flags)	(((flags) & XFS_IOLOCK_DEP_MASK) \
+					>> XFS_IOLOCK_SHIFT)
+#define XFS_MMAPLOCK_DEP(flags)	(((flags) & XFS_MMAPLOCK_DEP_MASK) \
+					>> XFS_MMAPLOCK_SHIFT)
+#define XFS_ILOCK_DEP(flags)	(((flags) & XFS_ILOCK_DEP_MASK) \
+					>> XFS_ILOCK_SHIFT)
+
+/*
+ * For multiple groups support: if S_ISGID bit is set in the parent
+ * directory, group of new file is set to that of the parent, and
+ * new subdirectory gets S_ISGID bit from parent.
+ */
+#define XFS_INHERIT_GID(pip)	\
+	(((pip)->i_mount->m_flags & XFS_MOUNT_GRPID) || \
+	 ((pip)->i_d.di_mode & S_ISGID))
+
+int		xfs_release(struct xfs_inode *ip);
+void		xfs_inactive(struct xfs_inode *ip);
+int		xfs_lookup(struct xfs_inode *dp, struct xfs_name *name,
+			   struct xfs_inode **ipp, struct xfs_name *ci_name);
+int		xfs_create(struct xfs_inode *dp, struct xfs_name *name,
+			   umode_t mode, xfs_dev_t rdev, struct xfs_inode **ipp);
+int		xfs_create_tmpfile(struct xfs_inode *dp, struct dentry *dentry,
+			   umode_t mode, struct xfs_inode **ipp);
+int		xfs_remove(struct xfs_inode *dp, struct xfs_name *name,
+			   struct xfs_inode *ip);
+int		xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,
+			 struct xfs_name *target_name);
+int		xfs_rename(struct xfs_inode *src_dp, struct xfs_name *src_name,
+			   struct xfs_inode *src_ip, struct xfs_inode *target_dp,
+			   struct xfs_name *target_name,
+			   struct xfs_inode *target_ip, unsigned int flags);
+
+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_data_map_shared(struct xfs_inode *);
+uint		xfs_ilock_attr_map_shared(struct xfs_inode *);
+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 **);
+
+uint		xfs_ip2xflags(struct xfs_inode *);
+uint		xfs_dic2xflags(struct xfs_dinode *);
+int		xfs_ifree(struct xfs_trans *, xfs_inode_t *,
+			   struct xfs_bmap_free *);
+int		xfs_itruncate_extents(struct xfs_trans **, struct xfs_inode *,
+				      int, xfs_fsize_t);
+int		xfs_iunlink(struct xfs_trans *, xfs_inode_t *);
+
+void		xfs_iext_realloc(xfs_inode_t *, int, int);
+
+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);
+
+int		xfs_dir_ialloc(struct xfs_trans **, struct xfs_inode *, umode_t,
+			       xfs_nlink_t, xfs_dev_t, prid_t, int,
+			       struct xfs_inode **, int *);
+int		xfs_droplink(struct xfs_trans *, struct xfs_inode *);
+int		xfs_bumplink(struct xfs_trans *, struct xfs_inode *);
+
+/* from xfs_file.c */
+enum xfs_prealloc_flags {
+	XFS_PREALLOC_SET	= (1 << 1),
+	XFS_PREALLOC_CLEAR	= (1 << 2),
+	XFS_PREALLOC_SYNC	= (1 << 3),
+	XFS_PREALLOC_INVISIBLE	= (1 << 4),
+};
+
+int	xfs_update_prealloc_flags(struct xfs_inode *ip,
+				  enum xfs_prealloc_flags flags);
+int	xfs_zero_eof(struct xfs_inode *ip, xfs_off_t offset,
+		     xfs_fsize_t isize, bool *did_zeroing);
+int	xfs_iozero(struct xfs_inode *ip, loff_t pos, size_t count);
+
+
+/* from xfs_iops.c */
+/*
+ * When setting up a newly allocated inode, we need to call
+ * xfs_finish_inode_setup() once the inode is fully instantiated at
+ * the VFS level to prevent the rest of the world seeing the inode
+ * before we've completed instantiation. Otherwise we can do it
+ * the moment the inode lookup is complete.
+ */
+extern void xfs_setup_inode(struct xfs_inode *ip);
+static inline void xfs_finish_inode_setup(struct xfs_inode *ip)
+{
+	xfs_iflags_clear(ip, XFS_INEW);
+	barrier();
+	unlock_new_inode(VFS_I(ip));
+}
+
+static inline void xfs_setup_existing_inode(struct xfs_inode *ip)
+{
+	xfs_setup_inode(ip);
+	xfs_finish_inode_setup(ip);
+}
+
+#define IHOLD(ip) \
+do { \
+	ASSERT(atomic_read(&VFS_I(ip)->i_count) > 0) ; \
+	ihold(VFS_I(ip)); \
+	trace_xfs_ihold(ip, _THIS_IP_); \
+} while (0)
+
+#define IRELE(ip) \
+do { \
+	trace_xfs_irele(ip, _THIS_IP_); \
+	iput(VFS_I(ip)); \
+} while (0)
+
+extern struct kmem_zone	*xfs_inode_zone;
+
+/*
+ * Flags for read/write calls
+ */
+#define XFS_IO_ISDIRECT	0x00001		/* bypass page cache */
+#define XFS_IO_INVIS	0x00002		/* don't update inode timestamps */
+
+#define XFS_IO_FLAGS \
+	{ XFS_IO_ISDIRECT,	"DIRECT" }, \
+	{ XFS_IO_INVIS,		"INVIS"}
+
+#endif	/* __XFS_INODE_H__ */