* [PATCH 1/4] GFS2: Make height info part of metapath
2017-06-07 14:11 [PATCH 0/4] gfs2 iomap: fiemap and lseek Andreas Gruenbacher
@ 2017-06-07 14:11 ` Andreas Gruenbacher
2017-06-07 14:11 ` [PATCH 2/4] GFS2: Implement iomap for block_map Andreas Gruenbacher
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: Andreas Gruenbacher @ 2017-06-07 14:11 UTC (permalink / raw)
To: cluster-devel
Cc: Bob Peterson, Christoph Hellwig, linux-fsdevel,
Andreas Gruenbacher
From: Bob Peterson <rpeterso@redhat.com>
This patch eliminates height parameters from function gfs2_bmap_alloc.
Function find_metapath determines the metapath's "find height", also
known as the desired height. Function lookup_metapath determines the
metapath's "actual height", previously known as starting height or
sheight. Function gfs2_bmap_alloc now gets both height values from
the metapath. This simplification was done as a step toward switching
the block_map functions to using iomap. The bh_map responsibilities
are also removed from function gfs2_bmap_alloc for the same reason.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/gfs2/bmap.c | 109 ++++++++++++++++++++++++++++++++-------------------------
1 file changed, 62 insertions(+), 47 deletions(-)
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 4d810be..a431afd 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -36,6 +36,8 @@
struct metapath {
struct buffer_head *mp_bh[GFS2_MAX_META_HEIGHT];
__u16 mp_list[GFS2_MAX_META_HEIGHT];
+ int mp_fheight; /* find_metapath height */
+ int mp_aheight; /* actual height (lookup height) */
};
/**
@@ -235,9 +237,9 @@ static void find_metapath(const struct gfs2_sbd *sdp, u64 block,
{
unsigned int i;
+ mp->mp_fheight = height;
for (i = height; i--;)
mp->mp_list[i] = do_div(block, sdp->sd_inptrs);
-
}
static inline unsigned int metapath_branch_start(const struct metapath *mp)
@@ -344,10 +346,13 @@ static int lookup_metapath(struct gfs2_inode *ip, struct metapath *mp)
for (x = 0; x < end_of_metadata; x++) {
ret = lookup_mp_height(ip, mp, x);
if (ret)
- return ret;
+ goto out;
}
- return ip->i_height;
+ ret = ip->i_height;
+out:
+ mp->mp_aheight = ret;
+ return ret;
}
/**
@@ -479,10 +484,11 @@ static inline unsigned int hptrs(struct gfs2_sbd *sdp, const unsigned int hgt)
* @inode: The GFS2 inode
* @lblock: The logical starting block of the extent
* @bh_map: This is used to return the mapping details
- * @mp: The metapath
- * @sheight: The starting height (i.e. whats already mapped)
- * @height: The height to build to
+ * @zero_new: True if newly allocated blocks should be zeroed
+ * @mp: The metapath, with proper height information calculated
* @maxlen: The max number of data blocks to alloc
+ * @dblock: Pointer to return the resulting new block
+ * @dblks: Pointer to return the number of blocks allocated
*
* In this routine we may have to alloc:
* i) Indirect blocks to grow the metadata tree height
@@ -499,62 +505,63 @@ static inline unsigned int hptrs(struct gfs2_sbd *sdp, const unsigned int hgt)
*/
static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
- struct buffer_head *bh_map, struct metapath *mp,
- const unsigned int sheight,
- const unsigned int height,
- const size_t maxlen)
+ bool zero_new, struct metapath *mp,
+ const size_t maxlen, sector_t *dblock,
+ unsigned *dblks)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
struct super_block *sb = sdp->sd_vfs;
struct buffer_head *dibh = mp->mp_bh[0];
- u64 bn, dblock = 0;
+ u64 bn;
unsigned n, i, blks, alloced = 0, iblks = 0, branch_start = 0;
- unsigned dblks = 0;
unsigned ptrs_per_blk;
- const unsigned end_of_metadata = height - 1;
+ const unsigned end_of_metadata = mp->mp_fheight - 1;
int ret;
int eob = 0;
enum alloc_state state;
__be64 *ptr;
__be64 zero_bn = 0;
- BUG_ON(sheight < 1);
+ BUG_ON(mp->mp_aheight < 1);
BUG_ON(dibh == NULL);
+ *dblock = 0;
+ *dblks = 0;
gfs2_trans_add_meta(ip->i_gl, dibh);
- if (height == sheight) {
+ if (mp->mp_fheight == mp->mp_aheight) {
struct buffer_head *bh;
/* Bottom indirect block exists, find unalloced extent size */
ptr = metapointer(end_of_metadata, mp);
bh = mp->mp_bh[end_of_metadata];
- dblks = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen,
- &eob);
- BUG_ON(dblks < 1);
+ *dblks = gfs2_extent_length(bh->b_data, bh->b_size, ptr,
+ maxlen, &eob);
+ BUG_ON(*dblks < 1);
state = ALLOC_DATA;
} else {
/* Need to allocate indirect blocks */
- ptrs_per_blk = height > 1 ? sdp->sd_inptrs : sdp->sd_diptrs;
- dblks = min(maxlen, (size_t)(ptrs_per_blk -
- mp->mp_list[end_of_metadata]));
- if (height == ip->i_height) {
+ ptrs_per_blk = mp->mp_fheight > 1 ? sdp->sd_inptrs :
+ sdp->sd_diptrs;
+ *dblks = min(maxlen, (size_t)(ptrs_per_blk -
+ mp->mp_list[end_of_metadata]));
+ if (mp->mp_fheight == ip->i_height) {
/* Writing into existing tree, extend tree down */
- iblks = height - sheight;
+ iblks = mp->mp_fheight - mp->mp_aheight;
state = ALLOC_GROW_DEPTH;
} else {
/* Building up tree height */
state = ALLOC_GROW_HEIGHT;
- iblks = height - ip->i_height;
+ iblks = mp->mp_fheight - ip->i_height;
branch_start = metapath_branch_start(mp);
- iblks += (height - branch_start);
+ iblks += (mp->mp_fheight - branch_start);
}
}
/* start of the second part of the function (state machine) */
- blks = dblks + iblks;
- i = sheight;
+ blks = *dblks + iblks;
+ i = mp->mp_aheight;
do {
int error;
n = blks - alloced;
@@ -572,9 +579,10 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
sizeof(struct gfs2_dinode));
zero_bn = *ptr;
}
- for (; i - 1 < height - ip->i_height && n > 0; i++, n--)
+ for (; i - 1 < mp->mp_fheight - ip->i_height && n > 0;
+ i++, n--)
gfs2_indirect_init(mp, ip->i_gl, i, 0, bn++);
- if (i - 1 == height - ip->i_height) {
+ if (i - 1 == mp->mp_fheight - ip->i_height) {
i--;
gfs2_buffer_copy_tail(mp->mp_bh[i],
sizeof(struct gfs2_meta_header),
@@ -586,7 +594,7 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
sizeof(struct gfs2_meta_header));
*ptr = zero_bn;
state = ALLOC_GROW_DEPTH;
- for(i = branch_start; i < height; i++) {
+ for(i = branch_start; i < mp->mp_fheight; i++) {
if (mp->mp_bh[i] == NULL)
break;
brelse(mp->mp_bh[i]);
@@ -598,44 +606,40 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
break;
/* Branching from existing tree */
case ALLOC_GROW_DEPTH:
- if (i > 1 && i < height)
+ if (i > 1 && i < mp->mp_fheight)
gfs2_trans_add_meta(ip->i_gl, mp->mp_bh[i-1]);
- for (; i < height && n > 0; i++, n--)
+ for (; i < mp->mp_fheight && n > 0; i++, n--)
gfs2_indirect_init(mp, ip->i_gl, i,
mp->mp_list[i-1], bn++);
- if (i == height)
+ if (i == mp->mp_fheight)
state = ALLOC_DATA;
if (n == 0)
break;
/* Tree complete, adding data blocks */
case ALLOC_DATA:
- BUG_ON(n > dblks);
+ BUG_ON(n > *dblks);
BUG_ON(mp->mp_bh[end_of_metadata] == NULL);
gfs2_trans_add_meta(ip->i_gl, mp->mp_bh[end_of_metadata]);
- dblks = n;
+ *dblks = n;
ptr = metapointer(end_of_metadata, mp);
- dblock = bn;
+ *dblock = bn;
while (n-- > 0)
*ptr++ = cpu_to_be64(bn++);
- if (buffer_zeronew(bh_map)) {
- ret = sb_issue_zeroout(sb, dblock, dblks,
+ if (zero_new) {
+ ret = sb_issue_zeroout(sb, *dblock, *dblks,
GFP_NOFS);
if (ret) {
fs_err(sdp,
"Failed to zero data buffers\n");
- clear_buffer_zeronew(bh_map);
}
}
break;
}
- } while ((state != ALLOC_DATA) || !dblock);
+ } while ((state != ALLOC_DATA) || !(*dblock));
- ip->i_height = height;
+ ip->i_height = mp->mp_fheight;
gfs2_add_inode_blocks(&ip->i_inode, alloced);
gfs2_dinode_out(ip, mp->mp_bh[0]->b_data);
- map_bh(bh_map, inode->i_sb, dblock);
- bh_map->b_size = dblks << inode->i_blkbits;
- set_buffer_new(bh_map);
return 0;
}
@@ -669,6 +673,9 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
unsigned int len;
struct buffer_head *bh;
u8 height;
+ bool zero_new = false;
+ sector_t dblock = 0;
+ unsigned dblks;
BUG_ON(maxlen == 0);
@@ -692,13 +699,13 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
while (size > arr[height])
height++;
find_metapath(sdp, lblock, &mp, height);
- ret = 1;
+ mp.mp_aheight = 1;
if (height > ip->i_height || gfs2_is_stuffed(ip))
goto do_alloc;
ret = lookup_metapath(ip, &mp);
if (ret < 0)
goto out;
- if (ret != ip->i_height)
+ if (mp.mp_aheight != ip->i_height)
goto do_alloc;
ptr = metapointer(ip->i_height - 1, &mp);
if (*ptr == 0)
@@ -725,7 +732,15 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
}
/* At this point ret is the tree depth of already allocated blocks */
- ret = gfs2_bmap_alloc(inode, lblock, bh_map, &mp, ret, height, maxlen);
+ if (buffer_zeronew(bh_map))
+ zero_new = true;
+ ret = gfs2_bmap_alloc(inode, lblock, zero_new, &mp, maxlen, &dblock,
+ &dblks);
+ if (ret == 0) {
+ map_bh(bh_map, inode->i_sb, dblock);
+ bh_map->b_size = dblks << inode->i_blkbits;
+ set_buffer_new(bh_map);
+ }
goto out;
}
--
2.7.4
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH 2/4] GFS2: Implement iomap for block_map
2017-06-07 14:11 [PATCH 0/4] gfs2 iomap: fiemap and lseek Andreas Gruenbacher
2017-06-07 14:11 ` [PATCH 1/4] GFS2: Make height info part of metapath Andreas Gruenbacher
@ 2017-06-07 14:11 ` Andreas Gruenbacher
2017-06-07 14:11 ` [PATCH 3/4] GFS2: Switch fiemap implementation to use iomap Andreas Gruenbacher
2017-06-07 14:11 ` [PATCH 4/4] gfs2: Implement lseek SEEK_HOLE / SEEK_DATA via iomap Andreas Gruenbacher
3 siblings, 0 replies; 6+ messages in thread
From: Andreas Gruenbacher @ 2017-06-07 14:11 UTC (permalink / raw)
To: cluster-devel
Cc: Bob Peterson, Christoph Hellwig, linux-fsdevel,
Andreas Gruenbacher
From: Bob Peterson <rpeterso@redhat.com>
This patch implements iomap for block mapping, and switches the
block_map function to use it under the covers.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/gfs2/bmap.c | 253 ++++++++++++++++++++++++++++++++++++--------------
fs/gfs2/bmap.h | 4 +
fs/gfs2/trace_gfs2.h | 65 +++++++++++++
include/linux/iomap.h | 3 +-
4 files changed, 254 insertions(+), 71 deletions(-)
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index a431afd..3e2aea57 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -13,6 +13,7 @@
#include <linux/blkdev.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
+#include <linux/iomap.h>
#include "gfs2.h"
#include "incore.h"
@@ -416,7 +417,6 @@ static inline unsigned int gfs2_extent_length(void *start, unsigned int len, __b
const __be64 *first = ptr;
u64 d = be64_to_cpu(*ptr);
- *eob = 0;
do {
ptr++;
if (ptr >= end)
@@ -504,10 +504,8 @@ static inline unsigned int hptrs(struct gfs2_sbd *sdp, const unsigned int hgt)
* Returns: errno on error
*/
-static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
- bool zero_new, struct metapath *mp,
- const size_t maxlen, sector_t *dblock,
- unsigned *dblks)
+static int gfs2_iomap_alloc(struct inode *inode, struct iomap *iomap,
+ unsigned flags, struct metapath *mp)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
@@ -515,36 +513,37 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
struct buffer_head *dibh = mp->mp_bh[0];
u64 bn;
unsigned n, i, blks, alloced = 0, iblks = 0, branch_start = 0;
+ unsigned dblks = 0;
unsigned ptrs_per_blk;
const unsigned end_of_metadata = mp->mp_fheight - 1;
int ret;
- int eob = 0;
enum alloc_state state;
__be64 *ptr;
__be64 zero_bn = 0;
+ size_t maxlen = iomap->length >> inode->i_blkbits;
BUG_ON(mp->mp_aheight < 1);
BUG_ON(dibh == NULL);
- *dblock = 0;
- *dblks = 0;
gfs2_trans_add_meta(ip->i_gl, dibh);
if (mp->mp_fheight == mp->mp_aheight) {
struct buffer_head *bh;
+ int eob;
+
/* Bottom indirect block exists, find unalloced extent size */
ptr = metapointer(end_of_metadata, mp);
bh = mp->mp_bh[end_of_metadata];
- *dblks = gfs2_extent_length(bh->b_data, bh->b_size, ptr,
- maxlen, &eob);
- BUG_ON(*dblks < 1);
+ dblks = gfs2_extent_length(bh->b_data, bh->b_size, ptr,
+ maxlen, &eob);
+ BUG_ON(dblks < 1);
state = ALLOC_DATA;
} else {
/* Need to allocate indirect blocks */
ptrs_per_blk = mp->mp_fheight > 1 ? sdp->sd_inptrs :
sdp->sd_diptrs;
- *dblks = min(maxlen, (size_t)(ptrs_per_blk -
- mp->mp_list[end_of_metadata]));
+ dblks = min(maxlen, (size_t)(ptrs_per_blk -
+ mp->mp_list[end_of_metadata]));
if (mp->mp_fheight == ip->i_height) {
/* Writing into existing tree, extend tree down */
iblks = mp->mp_fheight - mp->mp_aheight;
@@ -560,7 +559,7 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
/* start of the second part of the function (state machine) */
- blks = *dblks + iblks;
+ blks = dblks + iblks;
i = mp->mp_aheight;
do {
int error;
@@ -617,26 +616,28 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
break;
/* Tree complete, adding data blocks */
case ALLOC_DATA:
- BUG_ON(n > *dblks);
+ BUG_ON(n > dblks);
BUG_ON(mp->mp_bh[end_of_metadata] == NULL);
gfs2_trans_add_meta(ip->i_gl, mp->mp_bh[end_of_metadata]);
- *dblks = n;
+ dblks = n;
ptr = metapointer(end_of_metadata, mp);
- *dblock = bn;
+ iomap->blkno = bn;
while (n-- > 0)
*ptr++ = cpu_to_be64(bn++);
- if (zero_new) {
- ret = sb_issue_zeroout(sb, *dblock, *dblks,
- GFP_NOFS);
+ if (flags & IOMAP_ZERO) {
+ ret = sb_issue_zeroout(sb, iomap->blkno,
+ dblks, GFP_NOFS);
if (ret) {
fs_err(sdp,
"Failed to zero data buffers\n");
+ flags &= ~IOMAP_ZERO;
}
}
break;
}
- } while ((state != ALLOC_DATA) || !(*dblock));
+ } while (iomap->blkno == IOMAP_NULL_BLOCK);
+ iomap->length = (u64)dblks << inode->i_blkbits;
ip->i_height = mp->mp_fheight;
gfs2_add_inode_blocks(&ip->i_inode, alloced);
gfs2_dinode_out(ip, mp->mp_bh[0]->b_data);
@@ -644,47 +645,102 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
}
/**
- * gfs2_block_map - Map a block from an inode to a disk block
- * @inode: The inode
- * @lblock: The logical block number
- * @bh_map: The bh to be mapped
- * @create: True if its ok to alloc blocks to satify the request
+ * hole_size - figure out the size of a hole
+ * @ip: The inode
+ * @lblock: The logical starting block number
+ * @mp: The metapath
*
- * Sets buffer_mapped() if successful, sets buffer_boundary() if a
- * read of metadata will be required before the next block can be
- * mapped. Sets buffer_new() if new blocks were allocated.
+ * Returns: The hole size in bytes
*
- * Returns: errno
*/
+static u64 hole_size(struct inode *inode, sector_t lblock, struct metapath *mp)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ struct metapath mp_eof;
+ u64 factor = 1;
+ int hgt;
+ u64 holesz = 0;
+ const __be64 *first, *end, *ptr;
+ const struct buffer_head *bh;
+ u64 lblock_stop = (i_size_read(inode) - 1) >> inode->i_blkbits;
+ int zeroptrs;
+ bool done = false;
+
+ /* Get another metapath, to the very last byte */
+ find_metapath(sdp, lblock_stop, &mp_eof, ip->i_height);
+ for (hgt = ip->i_height - 1; hgt >= 0 && !done; hgt--) {
+ bh = mp->mp_bh[hgt];
+ if (bh) {
+ zeroptrs = 0;
+ first = metapointer(hgt, mp);
+ end = (const __be64 *)(bh->b_data + bh->b_size);
+
+ for (ptr = first; ptr < end; ptr++) {
+ if (*ptr) {
+ done = true;
+ break;
+ } else {
+ zeroptrs++;
+ }
+ }
+ } else {
+ zeroptrs = sdp->sd_inptrs;
+ }
+ if (factor * zeroptrs >= lblock_stop - lblock + 1) {
+ holesz = lblock_stop - lblock + 1;
+ break;
+ }
+ holesz += factor * zeroptrs;
-int gfs2_block_map(struct inode *inode, sector_t lblock,
- struct buffer_head *bh_map, int create)
+ factor *= sdp->sd_inptrs;
+ if (hgt && (mp->mp_list[hgt - 1] < mp_eof.mp_list[hgt - 1]))
+ (mp->mp_list[hgt - 1])++;
+ }
+ return holesz << inode->i_blkbits;
+}
+
+/**
+ * gfs2_get_iomap - Map blocks from an inode to disk blocks
+ * @inode: The inode
+ * @pos: Starting position in bytes
+ * @length: Length to map, in bytes
+ * @flags: iomap flags
+ * @iomap: The iomap structure
+ *
+ * Returns: errno
+ */
+int gfs2_get_iomap(struct inode *inode, loff_t pos, ssize_t length,
+ unsigned flags, struct iomap *iomap)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
+ struct metapath mp = { .mp_aheight = 1, };
unsigned int bsize = sdp->sd_sb.sb_bsize;
- const size_t maxlen = bh_map->b_size >> inode->i_blkbits;
const u64 *arr = sdp->sd_heightsize;
__be64 *ptr;
- u64 size;
- struct metapath mp;
+ sector_t lblock = pos >> inode->i_blkbits;
+ sector_t lend = (pos + length + sdp->sd_sb.sb_bsize - 1) >> inode->i_blkbits;
int ret;
- int eob;
+ int eob = 0;
unsigned int len;
struct buffer_head *bh;
u8 height;
- bool zero_new = false;
- sector_t dblock = 0;
- unsigned dblks;
+ loff_t isize = i_size_read(inode);
+
+ trace_gfs2_iomap_start(ip, pos, length, flags);
+ if (!length) {
+ ret = -EINVAL;
+ goto out;
+ }
- BUG_ON(maxlen == 0);
+ iomap->offset = lblock << inode->i_blkbits;
+ iomap->blkno = IOMAP_NULL_BLOCK;
+ iomap->type = IOMAP_HOLE;
+ iomap->length = (u64)(lend - lblock) << inode->i_blkbits;
+ iomap->flags = 0;
+ bmap_lock(ip, 0);
- memset(&mp, 0, sizeof(mp));
- bmap_lock(ip, create);
- clear_buffer_mapped(bh_map);
- clear_buffer_new(bh_map);
- clear_buffer_boundary(bh_map);
- trace_gfs2_bmap(ip, bh_map, lblock, create, 1);
if (gfs2_is_dir(ip)) {
bsize = sdp->sd_jbsize;
arr = sdp->sd_jheightsize;
@@ -692,56 +748,113 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
ret = gfs2_meta_inode_buffer(ip, &mp.mp_bh[0]);
if (ret)
- goto out;
+ goto out_release;
height = ip->i_height;
- size = (lblock + 1) * bsize;
- while (size > arr[height])
+ while ((lblock + 1) * bsize > arr[height])
height++;
find_metapath(sdp, lblock, &mp, height);
- mp.mp_aheight = 1;
if (height > ip->i_height || gfs2_is_stuffed(ip))
goto do_alloc;
+
ret = lookup_metapath(ip, &mp);
if (ret < 0)
- goto out;
+ goto out_release;
+
if (mp.mp_aheight != ip->i_height)
goto do_alloc;
+
ptr = metapointer(ip->i_height - 1, &mp);
if (*ptr == 0)
goto do_alloc;
- map_bh(bh_map, inode->i_sb, be64_to_cpu(*ptr));
+
+ iomap->type = IOMAP_MAPPED;
+ iomap->blkno = be64_to_cpu(*ptr);
+
bh = mp.mp_bh[ip->i_height - 1];
- len = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen, &eob);
- bh_map->b_size = (len << inode->i_blkbits);
+ len = gfs2_extent_length(bh->b_data, bh->b_size, ptr, lend - lblock, &eob);
if (eob)
- set_buffer_boundary(bh_map);
+ iomap->flags |= IOMAP_F_BOUNDARY;
+ iomap->length = (u64)len << inode->i_blkbits;
+
+ if (!(flags & IOMAP_WRITE) && iomap->offset + iomap->length > isize)
+ iomap->length = isize - iomap->offset;
+
ret = 0;
-out:
+
+out_release:
release_metapath(&mp);
- trace_gfs2_bmap(ip, bh_map, lblock, create, ret);
- bmap_unlock(ip, create);
+ bmap_unlock(ip, 0);
+out:
+ trace_gfs2_iomap_end(ip, iomap, ret);
return ret;
do_alloc:
- /* All allocations are done here, firstly check create flag */
- if (!create) {
+ if (!(flags & IOMAP_WRITE)) {
+ if (pos >= isize) {
+ ret = -ENOENT;
+ goto out_release;
+ }
BUG_ON(gfs2_is_stuffed(ip));
ret = 0;
- goto out;
+ iomap->length = hole_size(inode, lblock, &mp);
+ goto out_release;
}
- /* At this point ret is the tree depth of already allocated blocks */
+ ret = gfs2_iomap_alloc(inode, iomap, flags, &mp);
+ goto out_release;
+}
+
+/**
+ * gfs2_block_map - Map a block from an inode to a disk block
+ * @inode: The inode
+ * @lblock: The logical block number
+ * @bh_map: The bh to be mapped
+ * @create: True if its ok to alloc blocks to satify the request
+ *
+ * Sets buffer_mapped() if successful, sets buffer_boundary() if a
+ * read of metadata will be required before the next block can be
+ * mapped. Sets buffer_new() if new blocks were allocated.
+ *
+ * Returns: errno
+ */
+
+int gfs2_block_map(struct inode *inode, sector_t lblock,
+ struct buffer_head *bh_map, int create)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ struct iomap iomap;
+ int ret, flags = 0;
+
+ clear_buffer_mapped(bh_map);
+ clear_buffer_new(bh_map);
+ clear_buffer_boundary(bh_map);
+ trace_gfs2_bmap(ip, bh_map, lblock, create, 1);
+
+ if (create)
+ flags |= IOMAP_WRITE;
if (buffer_zeronew(bh_map))
- zero_new = true;
- ret = gfs2_bmap_alloc(inode, lblock, zero_new, &mp, maxlen, &dblock,
- &dblks);
- if (ret == 0) {
- map_bh(bh_map, inode->i_sb, dblock);
- bh_map->b_size = dblks << inode->i_blkbits;
+ flags |= IOMAP_ZERO;
+ ret = gfs2_get_iomap(inode, lblock << sdp->sd_sb.sb_bsize_shift,
+ bh_map->b_size, flags, &iomap);
+ if (ret)
+ goto out;
+
+ iomap.length = round_up(iomap.length, sdp->sd_sb.sb_bsize);
+ bh_map->b_size = iomap.length;
+ if (iomap.flags & IOMAP_F_BOUNDARY)
+ set_buffer_boundary(bh_map);
+ if (iomap.blkno != IOMAP_NULL_BLOCK)
+ map_bh(bh_map, inode->i_sb, iomap.blkno);
+ bh_map->b_size = iomap.length;
+ clear_buffer_zeronew(bh_map);
+ if (iomap.flags & IOMAP_F_NEW)
set_buffer_new(bh_map);
- }
- goto out;
+
+out:
+ trace_gfs2_bmap(ip, bh_map, lblock, create, ret);
+ return ret;
}
/*
diff --git a/fs/gfs2/bmap.h b/fs/gfs2/bmap.h
index 81ded5e..e904aed 100644
--- a/fs/gfs2/bmap.h
+++ b/fs/gfs2/bmap.h
@@ -10,6 +10,8 @@
#ifndef __BMAP_DOT_H__
#define __BMAP_DOT_H__
+#include <linux/iomap.h>
+
#include "inode.h"
struct inode;
@@ -47,6 +49,8 @@ static inline void gfs2_write_calc_reserv(const struct gfs2_inode *ip,
extern int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page);
extern int gfs2_block_map(struct inode *inode, sector_t lblock,
struct buffer_head *bh, int create);
+extern int gfs2_get_iomap(struct inode *inode, loff_t pos, ssize_t length,
+ unsigned flags, struct iomap *iomap);
extern int gfs2_extent_map(struct inode *inode, u64 lblock, int *new,
u64 *dblock, unsigned *extlen);
extern int gfs2_setattr_size(struct inode *inode, u64 size);
diff --git a/fs/gfs2/trace_gfs2.h b/fs/gfs2/trace_gfs2.h
index 49ac55d..3c91ae3 100644
--- a/fs/gfs2/trace_gfs2.h
+++ b/fs/gfs2/trace_gfs2.h
@@ -12,6 +12,7 @@
#include <linux/gfs2_ondisk.h>
#include <linux/writeback.h>
#include <linux/ktime.h>
+#include <linux/iomap.h>
#include "incore.h"
#include "glock.h"
#include "rgrp.h"
@@ -469,6 +470,70 @@ TRACE_EVENT(gfs2_bmap,
__entry->errno)
);
+TRACE_EVENT(gfs2_iomap_start,
+
+ TP_PROTO(const struct gfs2_inode *ip, loff_t pos, ssize_t length,
+ u16 flags),
+
+ TP_ARGS(ip, pos, length, flags),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( u64, inum )
+ __field( loff_t, pos )
+ __field( ssize_t, length )
+ __field( u16, flags )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = ip->i_gl->gl_name.ln_sbd->sd_vfs->s_dev;
+ __entry->inum = ip->i_no_addr;
+ __entry->pos = pos;
+ __entry->length = length;
+ __entry->flags = flags;
+ ),
+
+ TP_printk("%u,%u bmap %llu iomap start %llu/%lu flags:%08x",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ (unsigned long long)__entry->inum,
+ (unsigned long long)__entry->pos,
+ (unsigned long)__entry->length, (u16)__entry->flags)
+);
+
+TRACE_EVENT(gfs2_iomap_end,
+
+ TP_PROTO(const struct gfs2_inode *ip, struct iomap *iomap, int ret),
+
+ TP_ARGS(ip, iomap, ret),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( u64, inum )
+ __field( loff_t, offset )
+ __field( ssize_t, length )
+ __field( u16, flags )
+ __field( u16, type )
+ __field( int, ret )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = ip->i_gl->gl_name.ln_sbd->sd_vfs->s_dev;
+ __entry->inum = ip->i_no_addr;
+ __entry->offset = iomap->offset;
+ __entry->length = iomap->length;
+ __entry->flags = iomap->flags;
+ __entry->type = iomap->type;
+ __entry->ret = ret;
+ ),
+
+ TP_printk("%u,%u bmap %llu iomap end %llu/%lu ty:%d flags:%08x rc:%d",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ (unsigned long long)__entry->inum,
+ (unsigned long long)__entry->offset,
+ (unsigned long)__entry->length, (u16)__entry->type,
+ (u16)__entry->flags, __entry->ret)
+);
+
/* Keep track of blocks as they are allocated/freed */
TRACE_EVENT(gfs2_block_alloc,
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index f753e78..9d64933 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -21,7 +21,8 @@ struct vm_fault;
/*
* Flags for all iomap mappings:
*/
-#define IOMAP_F_NEW 0x01 /* blocks have been newly allocated */
+#define IOMAP_F_NEW 0x01 /* blocks have been newly allocated */
+#define IOMAP_F_BOUNDARY 0x02 /* mapping ends at metadata boundary */
/*
* Flags that only need to be reported for IOMAP_REPORT requests:
--
2.7.4
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH 3/4] GFS2: Switch fiemap implementation to use iomap
2017-06-07 14:11 [PATCH 0/4] gfs2 iomap: fiemap and lseek Andreas Gruenbacher
2017-06-07 14:11 ` [PATCH 1/4] GFS2: Make height info part of metapath Andreas Gruenbacher
2017-06-07 14:11 ` [PATCH 2/4] GFS2: Implement iomap for block_map Andreas Gruenbacher
@ 2017-06-07 14:11 ` Andreas Gruenbacher
2017-06-07 14:11 ` [PATCH 4/4] gfs2: Implement lseek SEEK_HOLE / SEEK_DATA via iomap Andreas Gruenbacher
3 siblings, 0 replies; 6+ messages in thread
From: Andreas Gruenbacher @ 2017-06-07 14:11 UTC (permalink / raw)
To: cluster-devel
Cc: Bob Peterson, Christoph Hellwig, linux-fsdevel,
Andreas Gruenbacher
From: Bob Peterson <rpeterso@redhat.com>
This patch switches GFS2's implementation of fiemap from the old
block_map code to the new iomap interface.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/gfs2/Kconfig | 1 +
fs/gfs2/inode.c | 22 +++++++++++++++-------
2 files changed, 16 insertions(+), 7 deletions(-)
diff --git a/fs/gfs2/Kconfig b/fs/gfs2/Kconfig
index 90c6a8f..43c827a 100644
--- a/fs/gfs2/Kconfig
+++ b/fs/gfs2/Kconfig
@@ -4,6 +4,7 @@ config GFS2_FS
select FS_POSIX_ACL
select CRC32
select QUOTACTL
+ select FS_IOMAP
help
A cluster filesystem.
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 9f605ea..9ed2e91 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -18,7 +18,7 @@
#include <linux/posix_acl.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
-#include <linux/fiemap.h>
+#include <linux/iomap.h>
#include <linux/security.h>
#include <linux/uaccess.h>
@@ -1996,6 +1996,17 @@ static int gfs2_getattr(const struct path *path, struct kstat *stat,
return 0;
}
+static int gfs2_iomap_begin(struct inode *inode, loff_t offset,
+ loff_t length, unsigned flags,
+ struct iomap *iomap)
+{
+ return gfs2_get_iomap(inode, offset, length, flags, iomap);
+}
+
+const struct iomap_ops gfs2_iomap_ops = {
+ .iomap_begin = gfs2_iomap_begin,
+};
+
static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
u64 start, u64 len)
{
@@ -2003,10 +2014,6 @@ static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
struct gfs2_holder gh;
int ret;
- ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
- if (ret)
- return ret;
-
inode_lock(inode);
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
@@ -2018,6 +2025,7 @@ static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
u64 size = i_size_read(inode);
u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
FIEMAP_EXTENT_DATA_INLINE;
+
phys += sizeof(struct gfs2_dinode);
phys += start;
if (start + len > size)
@@ -2028,11 +2036,11 @@ static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
if (ret == 1)
ret = 0;
} else {
- ret = __generic_block_fiemap(inode, fieinfo, start, len,
- gfs2_block_map);
+ ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
}
gfs2_glock_dq_uninit(&gh);
+
out:
inode_unlock(inode);
return ret;
--
2.7.4
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH 4/4] gfs2: Implement lseek SEEK_HOLE / SEEK_DATA via iomap
2017-06-07 14:11 [PATCH 0/4] gfs2 iomap: fiemap and lseek Andreas Gruenbacher
` (2 preceding siblings ...)
2017-06-07 14:11 ` [PATCH 3/4] GFS2: Switch fiemap implementation to use iomap Andreas Gruenbacher
@ 2017-06-07 14:11 ` Andreas Gruenbacher
2017-06-07 14:15 ` Christoph Hellwig
3 siblings, 1 reply; 6+ messages in thread
From: Andreas Gruenbacher @ 2017-06-07 14:11 UTC (permalink / raw)
To: cluster-devel; +Cc: Andreas Gruenbacher, Christoph Hellwig, linux-fsdevel
Add a vfs helper for implementing lseek SEEK_HOLE / SEEK_DATA support
via iomap. Wire up in gfs2.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/gfs2/file.c | 14 ++++++++++---
fs/gfs2/inode.c | 32 ++++++++++++++++++++++++++++++
fs/gfs2/inode.h | 1 +
fs/iomap.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/iomap.h | 2 ++
5 files changed, 101 insertions(+), 3 deletions(-)
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index c2062a1..62ce320 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -60,9 +60,7 @@ static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence)
loff_t error;
switch (whence) {
- case SEEK_END: /* These reference inode->i_size */
- case SEEK_DATA:
- case SEEK_HOLE:
+ case SEEK_END:
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
&i_gh);
if (!error) {
@@ -70,8 +68,18 @@ static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence)
gfs2_glock_dq_uninit(&i_gh);
}
break;
+
+ case SEEK_DATA:
+ case SEEK_HOLE:
+ error = gfs2_seek_hole_data(file, offset, whence);
+ break;
+
case SEEK_CUR:
case SEEK_SET:
+ /*
+ * These don't reference inode->i_size and don't depend on the
+ * block mapping, so we don't need the glock.
+ */
error = generic_file_llseek(file, offset, whence);
break;
default:
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 9ed2e91..f3bf740 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -2046,6 +2046,38 @@ static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
return ret;
}
+loff_t gfs2_seek_hole_data(struct file *file, loff_t offset, int whence)
+{
+ struct inode *inode = file->f_mapping->host;
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_holder gh;
+ loff_t ret;
+
+ inode_lock(inode);
+ ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
+ if (ret)
+ goto out;
+ if (gfs2_is_stuffed(ip)) {
+ u64 size = i_size_read(inode);
+
+ if (offset >= size) {
+ ret = -ENXIO;
+ goto out_dequeue;
+ }
+ ret = offset;
+ if (whence == SEEK_HOLE)
+ ret = size;
+ } else {
+ ret = iomap_seek_hole_data(inode, offset, whence, &gfs2_iomap_ops);
+ }
+
+out_dequeue:
+ gfs2_glock_dq_uninit(&gh);
+out:
+ inode_unlock(inode);
+ return ret;
+}
+
const struct inode_operations gfs2_file_iops = {
.permission = gfs2_permission,
.setattr = gfs2_setattr,
diff --git a/fs/gfs2/inode.h b/fs/gfs2/inode.h
index aace8ce..9e64b05 100644
--- a/fs/gfs2/inode.h
+++ b/fs/gfs2/inode.h
@@ -109,6 +109,7 @@ extern int gfs2_setattr_simple(struct inode *inode, struct iattr *attr);
extern struct inode *gfs2_lookup_simple(struct inode *dip, const char *name);
extern void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf);
extern int gfs2_open_common(struct inode *inode, struct file *file);
+extern loff_t gfs2_seek_hole_data(struct file *file, loff_t pos, int whence);
extern const struct inode_operations gfs2_file_iops;
extern const struct inode_operations gfs2_dir_iops;
diff --git a/fs/iomap.c b/fs/iomap.c
index 4b10892..59350ef 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -584,6 +584,61 @@ int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fi,
}
EXPORT_SYMBOL_GPL(iomap_fiemap);
+static loff_t
+iomap_seek_hole_actor(struct inode *inode, loff_t offset, loff_t length,
+ void *data, struct iomap *iomap)
+{
+ if (iomap->type == IOMAP_HOLE)
+ return 0;
+ return iomap->offset + iomap->length - offset;
+}
+
+static loff_t
+iomap_seek_data_actor(struct inode *inode, loff_t offset, loff_t length,
+ void *data, struct iomap *iomap)
+{
+ if (iomap->type != IOMAP_HOLE)
+ return 0;
+ return iomap->offset + iomap->length - offset;
+}
+
+loff_t
+iomap_seek_hole_data(struct inode *inode, loff_t offset, int whence,
+ const struct iomap_ops *ops)
+{
+ static loff_t (*actor)(struct inode *, loff_t, loff_t, void *, struct iomap *);
+ loff_t len = i_size_read(inode) - offset;
+ loff_t ret;
+
+ if (len <= 0)
+ return -ENXIO;
+
+ switch(whence) {
+ case SEEK_HOLE:
+ actor = iomap_seek_hole_actor;
+ break;
+
+ case SEEK_DATA:
+ actor = iomap_seek_data_actor;
+ break;
+ }
+
+ while (len > 0) {
+ ret = iomap_apply(inode, offset, len, IOMAP_REPORT, ops, NULL, actor);
+ if (ret <= 0)
+ break;
+ offset += ret;
+ len -= ret;
+ }
+ if (ret < 0)
+ return ret;
+ ret = offset;
+ if (len <= 0 && whence == SEEK_DATA)
+ ret = -ENXIO;
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iomap_seek_hole_data);
+
/*
* Private flags for iomap_dio, must not overlap with the public ones in
* iomap.h:
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 9d64933..63bd998 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -84,6 +84,8 @@ int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
int iomap_page_mkwrite(struct vm_fault *vmf, const struct iomap_ops *ops);
int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
loff_t start, loff_t len, const struct iomap_ops *ops);
+loff_t iomap_seek_hole_data(struct inode *inode, loff_t pos, int whence,
+ const struct iomap_ops *ops);
/*
* Flags for direct I/O ->end_io:
--
2.7.4
^ permalink raw reply related [flat|nested] 6+ messages in thread