#include "xfs_log.h"
#include "xfs_icache.h"
#include "xfs_pnfs.h"
+#include "xfs_iomap.h"
#include <linux/dcache.h>
#include <linux/falloc.h>
}
/*
- * xfs_iozero clears the specified range supplied via the page cache (except in
- * the DAX case). Writes through the page cache will allocate blocks over holes,
- * though the callers usually map the holes first and avoid them. If a block is
- * not completely zeroed, then it will be read from disk before being partially
- * zeroed.
- *
- * In the DAX case, we can just directly write to the underlying pages. This
- * will not allocate blocks, but will avoid holes and unwritten extents and so
- * not do unnecessary work.
+ * Clear the specified ranges to zero through either the pagecache or DAX.
+ * Holes and unwritten extents will be left as-is as they already are zeroed.
*/
int
-xfs_iozero(
- struct xfs_inode *ip, /* inode */
- loff_t pos, /* offset in file */
- size_t count) /* size of data to zero */
+xfs_zero_range(
+ struct xfs_inode *ip,
+ xfs_off_t pos,
+ xfs_off_t count,
+ bool *did_zero)
{
- struct page *page;
- struct address_space *mapping;
- int status = 0;
-
-
- mapping = VFS_I(ip)->i_mapping;
- do {
- unsigned offset, bytes;
- void *fsdata;
-
- offset = (pos & (PAGE_SIZE -1)); /* Within page */
- bytes = PAGE_SIZE - offset;
- if (bytes > count)
- bytes = count;
-
- if (IS_DAX(VFS_I(ip))) {
- status = dax_zero_page_range(VFS_I(ip), pos, bytes,
- xfs_get_blocks_direct);
- if (status)
- break;
- } else {
- status = pagecache_write_begin(NULL, mapping, pos, bytes,
- AOP_FLAG_UNINTERRUPTIBLE,
- &page, &fsdata);
- if (status)
- break;
-
- zero_user(page, offset, bytes);
-
- status = pagecache_write_end(NULL, mapping, pos, bytes,
- bytes, page, fsdata);
- WARN_ON(status <= 0); /* can't return less than zero! */
- status = 0;
- }
- pos += bytes;
- count -= bytes;
- } while (count);
-
- return status;
+ return iomap_zero_range(VFS_I(ip), pos, count, NULL, &xfs_iomap_ops);
}
int
return ret;
}
-/*
- * This routine is called to handle zeroing any space in the last block of the
- * file that is beyond the EOF. We do this since the size is being increased
- * without writing anything to that block and we don't want to read the
- * garbage on the disk.
- */
-STATIC int /* error (positive) */
-xfs_zero_last_block(
- struct xfs_inode *ip,
- xfs_fsize_t offset,
- xfs_fsize_t isize,
- bool *did_zeroing)
-{
- struct xfs_mount *mp = ip->i_mount;
- xfs_fileoff_t last_fsb = XFS_B_TO_FSBT(mp, isize);
- int zero_offset = XFS_B_FSB_OFFSET(mp, isize);
- int zero_len;
- int nimaps = 1;
- int error = 0;
- struct xfs_bmbt_irec imap;
-
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- error = xfs_bmapi_read(ip, last_fsb, 1, &imap, &nimaps, 0);
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- if (error)
- return error;
-
- ASSERT(nimaps > 0);
-
- /*
- * If the block underlying isize is just a hole, then there
- * is nothing to zero.
- */
- if (imap.br_startblock == HOLESTARTBLOCK)
- return 0;
-
- zero_len = mp->m_sb.sb_blocksize - zero_offset;
- if (isize + zero_len > offset)
- zero_len = offset - isize;
- *did_zeroing = true;
- return xfs_iozero(ip, isize, zero_len);
-}
-
/*
* Zero any on disk space between the current EOF and the new, larger EOF.
*
xfs_fsize_t isize, /* current inode size */
bool *did_zeroing)
{
- struct xfs_mount *mp = ip->i_mount;
- xfs_fileoff_t start_zero_fsb;
- xfs_fileoff_t end_zero_fsb;
- xfs_fileoff_t zero_count_fsb;
- xfs_fileoff_t last_fsb;
- xfs_fileoff_t zero_off;
- xfs_fsize_t zero_len;
- int nimaps;
- int error = 0;
- struct xfs_bmbt_irec imap;
-
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
ASSERT(offset > isize);
trace_xfs_zero_eof(ip, isize, offset - isize);
-
- /*
- * First handle zeroing the block on which isize resides.
- *
- * We only zero a part of that block so it is handled specially.
- */
- if (XFS_B_FSB_OFFSET(mp, isize) != 0) {
- error = xfs_zero_last_block(ip, offset, isize, did_zeroing);
- if (error)
- return error;
- }
-
- /*
- * Calculate the range between the new size and the old where blocks
- * needing to be zeroed may exist.
- *
- * To get the block where the last byte in the file currently resides,
- * we need to subtract one from the size and truncate back to a block
- * boundary. We subtract 1 in case the size is exactly on a block
- * boundary.
- */
- last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1;
- start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
- end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1);
- ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb);
- if (last_fsb == end_zero_fsb) {
- /*
- * The size was only incremented on its last block.
- * We took care of that above, so just return.
- */
- return 0;
- }
-
- ASSERT(start_zero_fsb <= end_zero_fsb);
- while (start_zero_fsb <= end_zero_fsb) {
- nimaps = 1;
- zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;
-
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- error = xfs_bmapi_read(ip, start_zero_fsb, zero_count_fsb,
- &imap, &nimaps, 0);
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- if (error)
- return error;
-
- ASSERT(nimaps > 0);
-
- if (imap.br_state == XFS_EXT_UNWRITTEN ||
- imap.br_startblock == HOLESTARTBLOCK) {
- start_zero_fsb = imap.br_startoff + imap.br_blockcount;
- ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
- continue;
- }
-
- /*
- * There are blocks we need to zero.
- */
- zero_off = XFS_FSB_TO_B(mp, start_zero_fsb);
- zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount);
-
- if ((zero_off + zero_len) > offset)
- zero_len = offset - zero_off;
-
- error = xfs_iozero(ip, zero_off, zero_len);
- if (error)
- return error;
-
- *did_zeroing = true;
- start_zero_fsb = imap.br_startoff + imap.br_blockcount;
- ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
- }
-
- return 0;
+ return xfs_zero_range(ip, isize, offset - isize, did_zeroing);
}
/*
write_retry:
trace_xfs_file_buffered_write(ip, iov_iter_count(from), iocb->ki_pos);
- ret = generic_perform_write(file, from, iocb->ki_pos);
+ ret = iomap_file_buffered_write(iocb, from, &xfs_iomap_ops);
if (likely(ret >= 0))
iocb->ki_pos += ret;
if (IS_DAX(inode)) {
ret = __dax_mkwrite(vma, vmf, xfs_get_blocks_dax_fault);
} else {
- ret = block_page_mkwrite(vma, vmf, xfs_get_blocks);
+ ret = iomap_page_mkwrite(vma, vmf, &xfs_iomap_ops);
ret = block_page_mkwrite_return(ret);
}
projects / mirror_ubuntu-bionic-kernel.git / blobdiff