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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | /* * linux/fs/ext2/fsync.c * * Copyright (C) 1993 Stephen Tweedie (sct@dcs.ed.ac.uk) * from * Copyright (C) 1992 Remy Card (card@masi.ibp.fr) * Laboratoire MASI - Institut Blaise Pascal * Universite Pierre et Marie Curie (Paris VI) * from * linux/fs/minix/truncate.c Copyright (C) 1991, 1992 Linus Torvalds * * ext2fs fsync primitive * * Big-endian to little-endian byte-swapping/bitmaps by * David S. Miller (davem@caip.rutgers.edu), 1995 * * Removed unnecessary code duplication for little endian machines * and excessive __inline__s. * Andi Kleen, 1997 * * Major simplications and cleanup - we only need to do the metadata, because * we can depend on generic_block_fdatasync() to sync the data blocks. */ #include <asm/uaccess.h> #include <asm/system.h> #include <asm/byteorder.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/ext2_fs.h> #include <linux/fcntl.h> #include <linux/sched.h> #include <linux/stat.h> #include <linux/locks.h> #define blocksize (EXT2_BLOCK_SIZE(inode->i_sb)) #define addr_per_block (EXT2_ADDR_PER_BLOCK(inode->i_sb)) static int sync_indirect(struct inode * inode, u32 * block, int wait) { struct buffer_head * bh; if (!*block) return 0; bh = get_hash_table(inode->i_dev, le32_to_cpu(*block), blocksize); if (!bh) return 0; if (wait && buffer_req(bh) && !buffer_uptodate(bh)) { brelse(bh); return -1; } if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) { brelse(bh); return 0; } ll_rw_block(WRITE, 1, &bh); atomic_dec(&bh->b_count); return 0; } static int sync_iblock(struct inode * inode, u32 * iblock, struct buffer_head ** bh, int wait) { int rc, tmp; *bh = NULL; tmp = le32_to_cpu(*iblock); if (!tmp) return 0; rc = sync_indirect(inode, iblock, wait); if (rc) return rc; *bh = bread(inode->i_dev, tmp, blocksize); if (!*bh) return -1; return 0; } static int sync_dindirect(struct inode * inode, u32 * diblock, int wait) { int i; struct buffer_head * dind_bh; int rc, err = 0; rc = sync_iblock(inode, diblock, &dind_bh, wait); if (rc || !dind_bh) return rc; for (i = 0; i < addr_per_block; i++) { rc = sync_indirect(inode, ((u32 *) dind_bh->b_data) + i, wait); if (rc) err = rc; } brelse(dind_bh); return err; } static int sync_tindirect(struct inode * inode, u32 * tiblock, int wait) { int i; struct buffer_head * tind_bh; int rc, err = 0; rc = sync_iblock(inode, tiblock, &tind_bh, wait); if (rc || !tind_bh) return rc; for (i = 0; i < addr_per_block; i++) { rc = sync_dindirect(inode, ((u32 *) tind_bh->b_data) + i, wait); if (rc) err = rc; } brelse(tind_bh); return err; } /* * File may be NULL when we are called. Perhaps we shouldn't * even pass file to fsync ? */ int ext2_sync_file(struct file * file, struct dentry *dentry) { int wait, err = 0; struct inode *inode = dentry->d_inode; if (S_ISLNK(inode->i_mode) && !(inode->i_blocks)) /* * Don't sync fast links! */ goto skip; err = generic_buffer_fdatasync(inode, 0, ~0UL); for (wait=0; wait<=1; wait++) { err |= sync_indirect(inode, inode->u.ext2_i.i_data+EXT2_IND_BLOCK, wait); err |= sync_dindirect(inode, inode->u.ext2_i.i_data+EXT2_DIND_BLOCK, wait); err |= sync_tindirect(inode, inode->u.ext2_i.i_data+EXT2_TIND_BLOCK, wait); } skip: err |= ext2_sync_inode (inode); return err ? -EIO : 0; } |