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Commit d3b6f23f authored by Ritesh Harjani's avatar Ritesh Harjani Committed by Theodore Ts'o
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ext4: move ext4_fiemap to use iomap framework 

This patch moves ext4_fiemap to use iomap framework.
For xattr a new 'ext4_iomap_xattr_ops' is added.
Reported-by: default avatarkbuild test robot <lkp@intel.com>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
Reviewed-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Link: https://lore.kernel.org/r/b9f45c885814fcdd0631747ff0fe08886270828c.1582880246.git.riteshh@linux.ibm.comSigned-off-by: default avatarRitesh Harjani <riteshh@linux.ibm.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent b2c57642
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Showing with 48 additions and 283 deletions
fs/ext4/extents.c
View file @ d3b6f23f
......@@ -28,6 +28,7 @@
#include <linux/uaccess.h>
#include <linux/fiemap.h>
#include <linux/backing-dev.h>
#include <linux/iomap.h>
#include "ext4_jbd2.h"
#include "ext4_extents.h"
#include "xattr.h"
......@@ -90,9 +91,6 @@ static int ext4_split_extent_at(handle_t *handle,
int split_flag,
int flags);
static int ext4_find_delayed_extent(struct inode *inode,
struct extent_status *newes);
static int ext4_ext_trunc_restart_fn(struct inode *inode, int *dropped)
{
/*
......@@ -2130,155 +2128,6 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
return err;
}
static int ext4_fill_fiemap_extents(struct inode *inode,
ext4_lblk_t block, ext4_lblk_t num,
struct fiemap_extent_info *fieinfo)
{
struct ext4_ext_path *path = NULL;
struct ext4_extent *ex;
struct extent_status es;
ext4_lblk_t next, next_del, start = 0, end = 0;
ext4_lblk_t last = block + num;
int exists, depth = 0, err = 0;
unsigned int flags = 0;
unsigned char blksize_bits = inode->i_sb->s_blocksize_bits;
while (block < last && block != EXT_MAX_BLOCKS) {
num = last - block;
/* find extent for this block */
down_read(&EXT4_I(inode)->i_data_sem);
path = ext4_find_extent(inode, block, &path, 0);
if (IS_ERR(path)) {
up_read(&EXT4_I(inode)->i_data_sem);
err = PTR_ERR(path);
path = NULL;
break;
}
depth = ext_depth(inode);
if (unlikely(path[depth].p_hdr == NULL)) {
up_read(&EXT4_I(inode)->i_data_sem);
EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth);
err = -EFSCORRUPTED;
break;
}
ex = path[depth].p_ext;
next = ext4_ext_next_allocated_block(path);
flags = 0;
exists = 0;
if (!ex) {
/* there is no extent yet, so try to allocate
* all requested space */
start = block;
end = block + num;
} else if (le32_to_cpu(ex->ee_block) > block) {
/* need to allocate space before found extent */
start = block;
end = le32_to_cpu(ex->ee_block);
if (block + num < end)
end = block + num;
} else if (block >= le32_to_cpu(ex->ee_block)
+ ext4_ext_get_actual_len(ex)) {
/* need to allocate space after found extent */
start = block;
end = block + num;
if (end >= next)
end = next;
} else if (block >= le32_to_cpu(ex->ee_block)) {
/*
* some part of requested space is covered
* by found extent
*/
start = block;
end = le32_to_cpu(ex->ee_block)
+ ext4_ext_get_actual_len(ex);
if (block + num < end)
end = block + num;
exists = 1;
} else {
BUG();
}
BUG_ON(end <= start);
if (!exists) {
es.es_lblk = start;
es.es_len = end - start;
es.es_pblk = 0;
} else {
es.es_lblk = le32_to_cpu(ex->ee_block);
es.es_len = ext4_ext_get_actual_len(ex);
es.es_pblk = ext4_ext_pblock(ex);
if (ext4_ext_is_unwritten(ex))
flags |= FIEMAP_EXTENT_UNWRITTEN;
}
/*
* Find delayed extent and update es accordingly. We call
* it even in !exists case to find out whether es is the
* last existing extent or not.
*/
next_del = ext4_find_delayed_extent(inode, &es);
if (!exists && next_del) {
exists = 1;
flags |= (FIEMAP_EXTENT_DELALLOC |
FIEMAP_EXTENT_UNKNOWN);
}
up_read(&EXT4_I(inode)->i_data_sem);
if (unlikely(es.es_len == 0)) {
EXT4_ERROR_INODE(inode, "es.es_len == 0");
err = -EFSCORRUPTED;
break;
}
/*
* This is possible iff next == next_del == EXT_MAX_BLOCKS.
* we need to check next == EXT_MAX_BLOCKS because it is
* possible that an extent is with unwritten and delayed
* status due to when an extent is delayed allocated and
* is allocated by fallocate status tree will track both of
* them in a extent.
*
* So we could return a unwritten and delayed extent, and
* its block is equal to 'next'.
*/
if (next == next_del && next == EXT_MAX_BLOCKS) {
flags |= FIEMAP_EXTENT_LAST;
if (unlikely(next_del != EXT_MAX_BLOCKS ||
next != EXT_MAX_BLOCKS)) {
EXT4_ERROR_INODE(inode,
"next extent == %u, next "
"delalloc extent = %u",
next, next_del);
err = -EFSCORRUPTED;
break;
}
}
if (exists) {
err = fiemap_fill_next_extent(fieinfo,
(__u64)es.es_lblk << blksize_bits,
(__u64)es.es_pblk << blksize_bits,
(__u64)es.es_len << blksize_bits,
flags);
if (err < 0)
break;
if (err == 1) {
err = 0;
break;
}
}
block = es.es_lblk + es.es_len;
}
ext4_ext_drop_refs(path);
kfree(path);
return err;
}
static int ext4_fill_es_cache_info(struct inode *inode,
ext4_lblk_t block, ext4_lblk_t num,
struct fiemap_extent_info *fieinfo)
......@@ -4927,64 +4776,13 @@ int ext4_convert_unwritten_io_end_vec(handle_t *handle, ext4_io_end_t *io_end)
return ret < 0 ? ret : err;
}
/*
* If newes is not existing extent (newes->ec_pblk equals zero) find
* delayed extent at start of newes and update newes accordingly and
* return start of the next delayed extent.
*
* If newes is existing extent (newes->ec_pblk is not equal zero)
* return start of next delayed extent or EXT_MAX_BLOCKS if no delayed
* extent found. Leave newes unmodified.
*/
static int ext4_find_delayed_extent(struct inode *inode,
struct extent_status *newes)
{
struct extent_status es;
ext4_lblk_t block, next_del;
if (newes->es_pblk == 0) {
ext4_es_find_extent_range(inode, &ext4_es_is_delayed,
newes->es_lblk,
newes->es_lblk + newes->es_len - 1,
&es);
/*
* No extent in extent-tree contains block @newes->es_pblk,
* then the block may stay in 1)a hole or 2)delayed-extent.
*/
if (es.es_len == 0)
/* A hole found. */
return 0;
if (es.es_lblk > newes->es_lblk) {
/* A hole found. */
newes->es_len = min(es.es_lblk - newes->es_lblk,
newes->es_len);
return 0;
}
newes->es_len = es.es_lblk + es.es_len - newes->es_lblk;
}
block = newes->es_lblk + newes->es_len;
ext4_es_find_extent_range(inode, &ext4_es_is_delayed, block,
EXT_MAX_BLOCKS, &es);
if (es.es_len == 0)
next_del = EXT_MAX_BLOCKS;
else
next_del = es.es_lblk;
return next_del;
}
static int ext4_xattr_fiemap(struct inode *inode,
struct fiemap_extent_info *fieinfo)
static int ext4_iomap_xattr_fiemap(struct inode *inode, struct iomap *iomap)
{
__u64 physical = 0;
__u64 length;
__u32 flags = FIEMAP_EXTENT_LAST;
__u64 length = 0;
int blockbits = inode->i_sb->s_blocksize_bits;
int error = 0;
u16 iomap_type;
/* in-inode? */
if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) {
......@@ -4999,40 +4797,49 @@ static int ext4_xattr_fiemap(struct inode *inode,
EXT4_I(inode)->i_extra_isize;
physical += offset;
length = EXT4_SB(inode->i_sb)->s_inode_size - offset;
flags |= FIEMAP_EXTENT_DATA_INLINE;
brelse(iloc.bh);
} else { /* external block */
iomap_type = IOMAP_INLINE;
} else if (EXT4_I(inode)->i_file_acl) { /* external block */
physical = (__u64)EXT4_I(inode)->i_file_acl << blockbits;
length = inode->i_sb->s_blocksize;
iomap_type = IOMAP_MAPPED;
} else {
/* no in-inode or external block for xattr, so return -ENOENT */
error = -ENOENT;
goto out;
}
if (physical)
error = fiemap_fill_next_extent(fieinfo, 0, physical,
length, flags);
return (error < 0 ? error : 0);
iomap->addr = physical;
iomap->offset = 0;
iomap->length = length;
iomap->type = iomap_type;
iomap->flags = 0;
out:
return error;
}
static int _ext4_fiemap(struct inode *inode,
struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len,
int (*fill)(struct inode *, ext4_lblk_t,
ext4_lblk_t,
struct fiemap_extent_info *))
static int ext4_iomap_xattr_begin(struct inode *inode, loff_t offset,
loff_t length, unsigned flags,
struct iomap *iomap, struct iomap *srcmap)
{
ext4_lblk_t start_blk;
u32 ext4_fiemap_flags = FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR;
int error;
int error = 0;
if (ext4_has_inline_data(inode)) {
int has_inline = 1;
error = ext4_iomap_xattr_fiemap(inode, iomap);
if (error == 0 && (offset >= iomap->length))
error = -ENOENT;
return error;
}
error = ext4_inline_data_fiemap(inode, fieinfo, &has_inline,
start, len);
static const struct iomap_ops ext4_iomap_xattr_ops = {
.iomap_begin = ext4_iomap_xattr_begin,
};
if (has_inline)
return error;
}
static int _ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len, bool from_es_cache)
{
ext4_lblk_t start_blk;
u32 ext4_fiemap_flags = FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR;
int error = 0;
if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) {
error = ext4_ext_precache(inode);
......@@ -5041,19 +4848,19 @@ static int _ext4_fiemap(struct inode *inode,
fieinfo->fi_flags &= ~FIEMAP_FLAG_CACHE;
}
/* fallback to generic here if not in extents fmt */
if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) &&
fill == ext4_fill_fiemap_extents)
return generic_block_fiemap(inode, fieinfo, start, len,
ext4_get_block);
if (fill == ext4_fill_es_cache_info)
if (from_es_cache)
ext4_fiemap_flags &= FIEMAP_FLAG_XATTR;
if (fiemap_check_flags(fieinfo, ext4_fiemap_flags))
return -EBADR;
if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
error = ext4_xattr_fiemap(inode, fieinfo);
fieinfo->fi_flags &= ~FIEMAP_FLAG_XATTR;
error = iomap_fiemap(inode, fieinfo, start, len,
&ext4_iomap_xattr_ops);
} else if (!from_es_cache) {
error = iomap_fiemap(inode, fieinfo, start, len,
&ext4_iomap_report_ops);
} else {
ext4_lblk_t len_blks;
__u64 last_blk;
......@@ -5068,7 +4875,8 @@ static int _ext4_fiemap(struct inode *inode,
* Walk the extent tree gathering extent information
* and pushing extents back to the user.
*/
error = fill(inode, start_blk, len_blks, fieinfo);
error = ext4_fill_es_cache_info(inode, start_blk, len_blks,
fieinfo);
}
return error;
}
......@@ -5076,8 +4884,7 @@ static int _ext4_fiemap(struct inode *inode,
int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len)
{
return _ext4_fiemap(inode, fieinfo, start, len,
ext4_fill_fiemap_extents);
return _ext4_fiemap(inode, fieinfo, start, len, false);
}
int ext4_get_es_cache(struct inode *inode, struct fiemap_extent_info *fieinfo,
......@@ -5093,8 +4900,7 @@ int ext4_get_es_cache(struct inode *inode, struct fiemap_extent_info *fieinfo,
return 0;
}
return _ext4_fiemap(inode, fieinfo, start, len,
ext4_fill_es_cache_info);
return _ext4_fiemap(inode, fieinfo, start, len, true);
}
......
fs/ext4/inline.c
View file @ d3b6f23f
......@@ -1857,47 +1857,6 @@ int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
return error;
}
int ext4_inline_data_fiemap(struct inode *inode,
struct fiemap_extent_info *fieinfo,
int *has_inline, __u64 start, __u64 len)
{
__u64 physical = 0;
__u64 inline_len;
__u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
FIEMAP_EXTENT_LAST;
int error = 0;
struct ext4_iloc iloc;
down_read(&EXT4_I(inode)->xattr_sem);
if (!ext4_has_inline_data(inode)) {
*has_inline = 0;
goto out;
}
inline_len = min_t(size_t, ext4_get_inline_size(inode),
i_size_read(inode));
if (start >= inline_len)
goto out;
if (start + len < inline_len)
inline_len = start + len;
inline_len -= start;
error = ext4_get_inode_loc(inode, &iloc);
if (error)
goto out;
physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
physical += offsetof(struct ext4_inode, i_block);
brelse(iloc.bh);
out:
up_read(&EXT4_I(inode)->xattr_sem);
if (physical)
error = fiemap_fill_next_extent(fieinfo, start, physical,
inline_len, flags);
return (error < 0 ? error : 0);
}
int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
{
handle_t *handle;
......
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