struct xfs_mount;
struct xfs_trans;
+extern kmem_zone_t *xfs_bmap_free_item_zone;
+
/*
* DELTA: describe a change to the in-core extent list.
*
/*
* Header for free extent list.
+ *
+ * xbf_low is used by the allocator to activate the lowspace algorithm -
+ * when free space is running low the extent allocator may choose to
+ * allocate an extent from an AG without leaving sufficient space for
+ * a btree split when inserting the new extent. In this case the allocator
+ * will enable the lowspace algorithm which is supposed to allow further
+ * allocations (such as btree splits and newroots) to allocate from
+ * sequential AGs. In order to avoid locking AGs out of order the lowspace
+ * algorithm will start searching for free space from AG 0. If the correct
+ * transaction reservations have been made then this algorithm will eventually
+ * find all the space it needs.
*/
typedef struct xfs_bmap_free
{
xfs_bmap_free_item_t *xbf_first; /* list of to-be-free extents */
int xbf_count; /* count of items on list */
- int xbf_low; /* kludge: alloc in low mode */
+ int xbf_low; /* alloc in low mode */
} xfs_bmap_free_t;
#define XFS_BMAP_MAX_NMAP 4
/* need write cache flushing and no */
/* additional allocation alignments */
-#define XFS_BMAPI_AFLAG(w) xfs_bmapi_aflag(w)
static inline int xfs_bmapi_aflag(int w)
{
return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 0);
#define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL)
#define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL)
-#define XFS_BMAP_INIT(flp,fbp) xfs_bmap_init(flp,fbp)
static inline void xfs_bmap_init(xfs_bmap_free_t *flp, xfs_fsblock_t *fbp)
{
((flp)->xbf_first = NULL, (flp)->xbf_count = 0, \
struct xfs_bmbt_irec *gotp; /* extent after, or delayed */
xfs_extlen_t alen; /* i/o length asked/allocated */
xfs_extlen_t total; /* total blocks needed for xaction */
- xfs_extlen_t minlen; /* mininum allocation size (blocks) */
+ xfs_extlen_t minlen; /* minimum allocation size (blocks) */
xfs_extlen_t minleft; /* amount must be left after alloc */
char eof; /* set if allocating past last extent */
char wasdel; /* replacing a delayed allocation */
char conv; /* overwriting unwritten extents */
} xfs_bmalloca_t;
-#ifdef __KERNEL__
-
-#if defined(XFS_BMAP_TRACE)
+#if defined(__KERNEL__) && defined(XFS_BMAP_TRACE)
/*
* Trace operations for bmap extent tracing
*/
xfs_extnum_t cnt, /* count of entries in list */
int whichfork); /* data or attr fork */
#define XFS_BMAP_TRACE_EXLIST(ip,c,w) \
- xfs_bmap_trace_exlist(__FUNCTION__,ip,c,w)
-#else
+ xfs_bmap_trace_exlist(__func__,ip,c,w)
+
+#else /* __KERNEL__ && XFS_BMAP_TRACE */
+
#define XFS_BMAP_TRACE_EXLIST(ip,c,w)
-#endif
+
+#endif /* __KERNEL__ && XFS_BMAP_TRACE */
/*
* Convert inode from non-attributed to attributed.
int whichfork); /* data or attr fork */
/*
- * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
- * caller. Frees all the extents that need freeing, which must be done
- * last due to locking considerations.
- *
- * Return 1 if the given transaction was committed and a new one allocated,
- * and 0 otherwise.
- */
-int /* error */
-xfs_bmap_finish(
- struct xfs_trans **tp, /* transaction pointer addr */
- xfs_bmap_free_t *flist, /* i/o: list extents to free */
- int *committed); /* xact committed or not */
-
-/*
* Returns the file-relative block number of the first unused block in the file.
* This is the lowest-address hole if the file has holes, else the first block
* past the end of file.
int *done); /* set if not done yet */
/*
- * Fcntl interface to xfs_bmapi.
+ * Check an extent list, which has just been read, for
+ * any bit in the extent flag field.
+ */
+int
+xfs_check_nostate_extents(
+ struct xfs_ifork *ifp,
+ xfs_extnum_t idx,
+ xfs_extnum_t num);
+
+uint
+xfs_default_attroffset(
+ struct xfs_inode *ip);
+
+#ifdef __KERNEL__
+
+/*
+ * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
+ * caller. Frees all the extents that need freeing, which must be done
+ * last due to locking considerations.
+ *
+ * Return 1 if the given transaction was committed and a new one allocated,
+ * and 0 otherwise.
+ */
+int /* error */
+xfs_bmap_finish(
+ struct xfs_trans **tp, /* transaction pointer addr */
+ xfs_bmap_free_t *flist, /* i/o: list extents to free */
+ int *committed); /* xact committed or not */
+
+/* bmap to userspace formatter - copy to user & advance pointer */
+typedef int (*xfs_bmap_format_t)(void **, struct getbmapx *, int *);
+
+/*
+ * Get inode's extents as described in bmv, and format for output.
*/
int /* error code */
xfs_getbmap(
- bhv_desc_t *bdp, /* XFS behavior descriptor*/
- struct getbmap *bmv, /* user bmap structure */
- void __user *ap, /* pointer to user's array */
- int iflags); /* interface flags */
+ xfs_inode_t *ip,
+ struct getbmapx *bmv, /* user bmap structure */
+ xfs_bmap_format_t formatter, /* format to user */
+ void *arg); /* formatter arg */
/*
* Check if the endoff is outside the last extent. If so the caller will grow
int *count);
/*
- * Check an extent list, which has just been read, for
- * any bit in the extent flag field.
- */
-int
-xfs_check_nostate_extents(
- struct xfs_ifork *ifp,
- xfs_extnum_t idx,
- xfs_extnum_t num);
-
-/*
* Search the extent records for the entry containing block bno.
* If bno lies in a hole, point to the next entry. If bno lies
* past eof, *eofp will be set, and *prevp will contain the last
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff