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[XFS] convert xfs_getbmap to take formatter functions

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Preliminary work to hook up fiemap, this allows us to pass in an
arbitrary formatter to copy extent data back to userspace.

The formatter takes info for 1 extent, a pointer to the user "thing*"
and a pointer to a "filled" variable to indicate whether a userspace
buffer did get filled in (for fiemap, hole "extents" are skipped).

I'm just using the getbmapx struct as a "common denominator" because
as far as I can see, it holds all info that any formatters will care
about.

("*thing" because fiemap doesn't pass the user pointer around, but rather
has a pointer to a fiemap info structure, and helpers associated with it)

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Niv Sardi <xaiki@sgi.com>
This commit is contained in:
Eric Sandeen 2008-11-28 14:23:35 +11:00 committed by Niv Sardi
parent 0924b585fc
commit 8a7141a8b9
4 changed files with 71 additions and 78 deletions
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64
fs/xfs/linux-2.6/xfs_ioctl.c
View file

@ -1249,6 +1249,19 @@ xfs_ioc_setxflags(
return -xfs_ioctl_setattr(ip, &fa, mask);
}
STATIC int
xfs_getbmap_format(void **ap, struct getbmapx *bmv, int *full)
{
struct getbmap __user *base = *ap;
/* copy only getbmap portion (not getbmapx) */
if (copy_to_user(base, bmv, sizeof(struct getbmap)))
return XFS_ERROR(EFAULT);
*ap += sizeof(struct getbmap);
return 0;
}
STATIC int
xfs_ioc_getbmap(
struct xfs_inode *ip,
@ -1256,37 +1269,48 @@ xfs_ioc_getbmap(
unsigned int cmd,
void __user *arg)
{
struct getbmap bm;
int iflags;
struct getbmapx bmx;
int error;
if (copy_from_user(&bm, arg, sizeof(bm)))
if (copy_from_user(&bmx, arg, sizeof(struct getbmapx)))
return -XFS_ERROR(EFAULT);
if (bm.bmv_count < 2)
if (bmx.bmv_count < 2)
return -XFS_ERROR(EINVAL);
iflags = (cmd == XFS_IOC_GETBMAPA ? BMV_IF_ATTRFORK : 0);
bmx.bmv_iflags = (cmd == XFS_IOC_GETBMAPA ? BMV_IF_ATTRFORK : 0);
if (ioflags & IO_INVIS)
iflags |= BMV_IF_NO_DMAPI_READ;
bmx.bmv_iflags |= BMV_IF_NO_DMAPI_READ;
error = xfs_getbmap(ip, &bm, (struct getbmap __user *)arg+1, iflags);
error = xfs_getbmap(ip, &bmx, xfs_getbmap_format,
(struct getbmap *)arg+1);
if (error)
return -error;
if (copy_to_user(arg, &bm, sizeof(bm)))
/* copy back header - only size of getbmap */
if (copy_to_user(arg, &bmx, sizeof(struct getbmap)))
return -XFS_ERROR(EFAULT);
return 0;
}
STATIC int
xfs_getbmapx_format(void **ap, struct getbmapx *bmv, int *full)
{
struct getbmapx __user *base = *ap;
if (copy_to_user(base, bmv, sizeof(struct getbmapx)))
return XFS_ERROR(EFAULT);
*ap += sizeof(struct getbmapx);
return 0;
}
STATIC int
xfs_ioc_getbmapx(
struct xfs_inode *ip,
void __user *arg)
{
struct getbmapx bmx;
struct getbmap bm;
int iflags;
int error;
if (copy_from_user(&bmx, arg, sizeof(bmx)))
@ -1295,26 +1319,16 @@ xfs_ioc_getbmapx(
if (bmx.bmv_count < 2)
return -XFS_ERROR(EINVAL);
/*
* Map input getbmapx structure to a getbmap
* structure for xfs_getbmap.
*/
GETBMAP_CONVERT(bmx, bm);
iflags = bmx.bmv_iflags;
if (iflags & (~BMV_IF_VALID))
if (bmx.bmv_iflags & (~BMV_IF_VALID))
return -XFS_ERROR(EINVAL);
iflags |= BMV_IF_EXTENDED;
error = xfs_getbmap(ip, &bm, (struct getbmapx __user *)arg+1, iflags);
error = xfs_getbmap(ip, &bmx, xfs_getbmapx_format,
(struct getbmapx *)arg+1);
if (error)
return -error;
GETBMAP_CONVERT(bm, bmx);
if (copy_to_user(arg, &bmx, sizeof(bmx)))
/* copy back header */
if (copy_to_user(arg, &bmx, sizeof(struct getbmapx)))
return -XFS_ERROR(EFAULT);
return 0;

62
fs/xfs/xfs_bmap.c
View file

@ -5811,9 +5811,9 @@ xfs_bunmapi(
STATIC int
xfs_getbmapx_fix_eof_hole(
xfs_inode_t *ip, /* xfs incore inode pointer */
struct getbmap *out, /* output structure */
struct getbmapx *out, /* output structure */
int prealloced, /* this is a file with
* preallocated data space */
* preallocated data space */
__int64_t end, /* last block requested */
xfs_fsblock_t startblock)
{
@ -5839,14 +5839,18 @@ xfs_getbmapx_fix_eof_hole(
}
/*
* Fcntl interface to xfs_bmapi.
* Get inode's extents as described in bmv, and format for output.
* Calls formatter to fill the user's buffer until all extents
* are mapped, until the passed-in bmv->bmv_count slots have
* been filled, or until the formatter short-circuits the loop,
* if it is tracking filled-in extents on its own.
*/
int /* error code */
xfs_getbmap(
xfs_inode_t *ip,
struct getbmap *bmv, /* user bmap structure */
void __user *ap, /* pointer to user's array */
int interface) /* interface flags */
struct getbmapx *bmv, /* user bmap structure */
xfs_bmap_format_t formatter, /* format to user */
void *arg) /* formatter arg */
{
__int64_t bmvend; /* last block requested */
int error; /* return value */
@ -5859,19 +5863,20 @@ xfs_getbmap(
int nexleft; /* # of user extents left */
int subnex; /* # of bmapi's can do */
int nmap; /* number of map entries */
struct getbmap out; /* output structure */
struct getbmapx out; /* output structure */
int whichfork; /* data or attr fork */
int prealloced; /* this is a file with
* preallocated data space */
int sh_unwritten; /* true, if unwritten */
/* extents listed separately */
int iflags; /* interface flags */
int bmapi_flags; /* flags for xfs_bmapi */
__int32_t oflags; /* getbmapx bmv_oflags field */
mp = ip->i_mount;
iflags = bmv->bmv_iflags;
whichfork = interface & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
sh_unwritten = (interface & BMV_IF_PREALLOC) != 0;
whichfork = iflags & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
sh_unwritten = (iflags & BMV_IF_PREALLOC) != 0;
/* If the BMV_IF_NO_DMAPI_READ interface bit specified, do not
* generate a DMAPI read event. Otherwise, if the DM_EVENT_READ
@ -5886,7 +5891,7 @@ xfs_getbmap(
* could misinterpret holes in a DMAPI file as true holes,
* when in fact they may represent offline user data.
*/
if ((interface & BMV_IF_NO_DMAPI_READ) == 0 &&
if ((iflags & BMV_IF_NO_DMAPI_READ) == 0 &&
DM_EVENT_ENABLED(ip, DM_EVENT_READ) &&
whichfork == XFS_DATA_FORK) {
error = XFS_SEND_DATA(mp, DM_EVENT_READ, ip, 0, 0, 0, NULL);
@ -5993,52 +5998,35 @@ xfs_getbmap(
ASSERT(nmap <= subnex);
for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
nexleft--;
oflags = (map[i].br_state == XFS_EXT_UNWRITTEN) ?
out.bmv_oflags = (map[i].br_state == XFS_EXT_UNWRITTEN) ?
BMV_OF_PREALLOC : 0;
out.bmv_offset = XFS_FSB_TO_BB(mp, map[i].br_startoff);
out.bmv_length = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
out.bmv_unused1 = out.bmv_unused2 = 0;
ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
if (map[i].br_startblock == HOLESTARTBLOCK &&
whichfork == XFS_ATTR_FORK) {
/* came to the end of attribute fork */
goto unlock_and_return;
} else {
int full = 0; /* user array is full */
if (!xfs_getbmapx_fix_eof_hole(ip, &out,
prealloced, bmvend,
map[i].br_startblock)) {
goto unlock_and_return;
}
/* return either getbmap/getbmapx structure. */
if (interface & BMV_IF_EXTENDED) {
struct getbmapx outx;
GETBMAP_CONVERT(out,outx);
outx.bmv_oflags = oflags;
outx.bmv_unused1 = outx.bmv_unused2 = 0;
if (copy_to_user(ap, &outx,
sizeof(outx))) {
error = XFS_ERROR(EFAULT);
goto unlock_and_return;
}
} else {
if (copy_to_user(ap, &out,
sizeof(out))) {
error = XFS_ERROR(EFAULT);
goto unlock_and_return;
}
}
/* format results & advance arg */
error = formatter(&arg, &out, &full);
if (error || full)
goto unlock_and_return;
nexleft--;
bmv->bmv_offset =
out.bmv_offset + out.bmv_length;
bmv->bmv_length = MAX((__int64_t)0,
(__int64_t)(bmvend - bmv->bmv_offset));
bmv->bmv_entries++;
ap = (interface & BMV_IF_EXTENDED) ?
(void __user *)
((struct getbmapx __user *)ap + 1) :
(void __user *)
((struct getbmap __user *)ap + 1);
}
}
} while (nmap && nexleft && bmv->bmv_length);

11
fs/xfs/xfs_bmap.h
View file

@ -356,15 +356,18 @@ xfs_bmap_finish(
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 *);
/*
* Fcntl interface to xfs_bmapi.
* Get inode's extents as described in bmv, and format for output.
*/
int /* error code */
xfs_getbmap(
xfs_inode_t *ip,
struct getbmap *bmv, /* user bmap structure */
void __user *ap, /* pointer to user's array */
int iflags); /* interface flags */
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

12
fs/xfs/xfs_fs.h
View file

@ -114,22 +114,10 @@ struct getbmapx {
#define BMV_IF_NO_DMAPI_READ 0x2 /* Do not generate DMAPI read event */
#define BMV_IF_PREALLOC 0x4 /* rtn status BMV_OF_PREALLOC if req */
#define BMV_IF_VALID (BMV_IF_ATTRFORK|BMV_IF_NO_DMAPI_READ|BMV_IF_PREALLOC)
#ifdef __KERNEL__
#define BMV_IF_EXTENDED 0x40000000 /* getpmapx if set */
#endif
/* bmv_oflags values - returned for for each non-header segment */
#define BMV_OF_PREALLOC 0x1 /* segment = unwritten pre-allocation */
/* Convert getbmap <-> getbmapx - move fields from p1 to p2. */
#define GETBMAP_CONVERT(p1,p2) { \
p2.bmv_offset = p1.bmv_offset; \
p2.bmv_block = p1.bmv_block; \
p2.bmv_length = p1.bmv_length; \
p2.bmv_count = p1.bmv_count; \
p2.bmv_entries = p1.bmv_entries; }
/*
* Structure for XFS_IOC_FSSETDM.
* For use by backup and restore programs to set the XFS on-disk inode