int xfs_iomap_write_delay( xfs_inode_t *ip, xfs_off_t offset, size_t count, int ioflag, xfs_bmbt_irec_t *ret_imap, int *nmaps) { xfs_mount_t *mp = ip->i_mount; xfs_fileoff_t offset_fsb; xfs_fileoff_t last_fsb; xfs_off_t aligned_offset; xfs_fileoff_t ioalign; xfs_fsblock_t firstblock; xfs_extlen_t extsz; int nimaps; xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; int prealloc, flushed = 0; int error; ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); /* * Make sure that the dquots are there. This doesn't hold * the ilock across a disk read. */ error = xfs_qm_dqattach_locked(ip, 0); if (error) return XFS_ERROR(error); extsz = xfs_get_extsz_hint(ip); offset_fsb = XFS_B_TO_FSBT(mp, offset); error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count, ioflag, imap, XFS_WRITE_IMAPS, &prealloc); if (error) return error; retry: if (prealloc) { aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); ioalign = XFS_B_TO_FSBT(mp, aligned_offset); last_fsb = ioalign + mp->m_writeio_blocks; } else { last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); } if (prealloc || extsz) { error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); if (error) return error; } nimaps = XFS_WRITE_IMAPS; firstblock = NULLFSBLOCK; error = xfs_bmapi(NULL, ip, offset_fsb, (xfs_filblks_t)(last_fsb - offset_fsb), XFS_BMAPI_DELAY | XFS_BMAPI_WRITE | XFS_BMAPI_ENTIRE, &firstblock, 1, imap, &nimaps, NULL, NULL); if (error && (error != ENOSPC)) return XFS_ERROR(error); /* * If bmapi returned us nothing, and if we didn't get back EDQUOT, * then we must have run out of space - flush all other inodes with * delalloc blocks and retry without EOF preallocation. */ if (nimaps == 0) { xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE, ip, offset, count); if (flushed) return XFS_ERROR(ENOSPC); xfs_iunlock(ip, XFS_ILOCK_EXCL); xfs_flush_inodes(ip); xfs_ilock(ip, XFS_ILOCK_EXCL); flushed = 1; error = 0; prealloc = 0; goto retry; } if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip))) return xfs_cmn_err_fsblock_zero(ip, &imap[0]); *ret_imap = imap[0]; *nmaps = 1; return 0; }
int xfs_iomap_write_delay( xfs_inode_t *ip, xfs_off_t offset, size_t count, int ioflag, xfs_bmbt_irec_t *ret_imap, int *nmaps) { xfs_mount_t *mp = ip->i_mount; xfs_iocore_t *io = &ip->i_iocore; xfs_fileoff_t offset_fsb; xfs_fileoff_t last_fsb; xfs_off_t aligned_offset; xfs_fileoff_t ioalign; xfs_fsblock_t firstblock; xfs_extlen_t extsz; xfs_fsize_t isize; int nimaps; xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; int prealloc, fsynced = 0; int error; ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0); /* * Make sure that the dquots are there. This doesn't hold * the ilock across a disk read. */ error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED); if (error) return XFS_ERROR(error); if (XFS_IS_REALTIME_INODE(ip)) { if (!(extsz = ip->i_d.di_extsize)) extsz = mp->m_sb.sb_rextsize; } else { extsz = ip->i_d.di_extsize; } offset_fsb = XFS_B_TO_FSBT(mp, offset); retry: isize = ip->i_d.di_size; if (io->io_new_size > isize) isize = io->io_new_size; error = xfs_iomap_eof_want_preallocate(mp, io, isize, offset, count, ioflag, imap, XFS_WRITE_IMAPS, &prealloc); if (error) return error; if (prealloc) { aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); ioalign = XFS_B_TO_FSBT(mp, aligned_offset); last_fsb = ioalign + mp->m_writeio_blocks; } else { last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); } if (prealloc || extsz) { error = xfs_iomap_eof_align_last_fsb(mp, io, isize, extsz, &last_fsb); if (error) return error; } nimaps = XFS_WRITE_IMAPS; firstblock = NULLFSBLOCK; error = XFS_BMAPI(mp, NULL, io, offset_fsb, (xfs_filblks_t)(last_fsb - offset_fsb), XFS_BMAPI_DELAY | XFS_BMAPI_WRITE | XFS_BMAPI_ENTIRE, &firstblock, 1, imap, &nimaps, NULL, NULL); if (error && (error != ENOSPC)) return XFS_ERROR(error); /* * If bmapi returned us nothing, and if we didn't get back EDQUOT, * then we must have run out of space - flush delalloc, and retry.. */ if (nimaps == 0) { xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE, io, offset, count); if (xfs_flush_space(ip, &fsynced, &ioflag)) return XFS_ERROR(ENOSPC); error = 0; goto retry; } if (unlikely(!imap[0].br_startblock && !(io->io_flags & XFS_IOCORE_RT))) return xfs_cmn_err_fsblock_zero(ip, &imap[0]); *ret_imap = imap[0]; *nmaps = 1; return 0; }