file.c 3.7 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Copyright (C) International Business Machines Corp., 2000-2002
  4. * Portions Copyright (C) Christoph Hellwig, 2001-2002
  5. */
  6. #include <linux/mm.h>
  7. #include <linux/fs.h>
  8. #include <linux/posix_acl.h>
  9. #include <linux/quotaops.h>
  10. #include "jfs_incore.h"
  11. #include "jfs_inode.h"
  12. #include "jfs_dmap.h"
  13. #include "jfs_txnmgr.h"
  14. #include "jfs_xattr.h"
  15. #include "jfs_acl.h"
  16. #include "jfs_debug.h"
  17. int jfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
  18. {
  19. struct inode *inode = file->f_mapping->host;
  20. int rc = 0;
  21. rc = file_write_and_wait_range(file, start, end);
  22. if (rc)
  23. return rc;
  24. inode_lock(inode);
  25. if (!(inode->i_state & I_DIRTY_ALL) ||
  26. (datasync && !(inode->i_state & I_DIRTY_DATASYNC))) {
  27. /* Make sure committed changes hit the disk */
  28. jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
  29. inode_unlock(inode);
  30. return rc;
  31. }
  32. rc |= jfs_commit_inode(inode, 1);
  33. inode_unlock(inode);
  34. return rc ? -EIO : 0;
  35. }
  36. static int jfs_open(struct inode *inode, struct file *file)
  37. {
  38. int rc;
  39. if ((rc = dquot_file_open(inode, file)))
  40. return rc;
  41. /*
  42. * We attempt to allow only one "active" file open per aggregate
  43. * group. Otherwise, appending to files in parallel can cause
  44. * fragmentation within the files.
  45. *
  46. * If the file is empty, it was probably just created and going
  47. * to be written to. If it has a size, we'll hold off until the
  48. * file is actually grown.
  49. */
  50. if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
  51. (inode->i_size == 0)) {
  52. struct jfs_inode_info *ji = JFS_IP(inode);
  53. spin_lock_irq(&ji->ag_lock);
  54. if (ji->active_ag == -1) {
  55. struct jfs_sb_info *jfs_sb = JFS_SBI(inode->i_sb);
  56. ji->active_ag = BLKTOAG(addressPXD(&ji->ixpxd), jfs_sb);
  57. atomic_inc(&jfs_sb->bmap->db_active[ji->active_ag]);
  58. }
  59. spin_unlock_irq(&ji->ag_lock);
  60. }
  61. return 0;
  62. }
  63. static int jfs_release(struct inode *inode, struct file *file)
  64. {
  65. struct jfs_inode_info *ji = JFS_IP(inode);
  66. spin_lock_irq(&ji->ag_lock);
  67. if (ji->active_ag != -1) {
  68. struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
  69. atomic_dec(&bmap->db_active[ji->active_ag]);
  70. ji->active_ag = -1;
  71. }
  72. spin_unlock_irq(&ji->ag_lock);
  73. return 0;
  74. }
  75. int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
  76. {
  77. struct inode *inode = d_inode(dentry);
  78. int rc;
  79. rc = setattr_prepare(dentry, iattr);
  80. if (rc)
  81. return rc;
  82. if (is_quota_modification(inode, iattr)) {
  83. rc = dquot_initialize(inode);
  84. if (rc)
  85. return rc;
  86. }
  87. if ((iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) ||
  88. (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))) {
  89. rc = dquot_transfer(inode, iattr);
  90. if (rc)
  91. return rc;
  92. }
  93. if ((iattr->ia_valid & ATTR_SIZE) &&
  94. iattr->ia_size != i_size_read(inode)) {
  95. inode_dio_wait(inode);
  96. rc = inode_newsize_ok(inode, iattr->ia_size);
  97. if (rc)
  98. return rc;
  99. truncate_setsize(inode, iattr->ia_size);
  100. jfs_truncate(inode);
  101. }
  102. setattr_copy(inode, iattr);
  103. mark_inode_dirty(inode);
  104. if (iattr->ia_valid & ATTR_MODE)
  105. rc = posix_acl_chmod(inode, inode->i_mode);
  106. return rc;
  107. }
  108. const struct inode_operations jfs_file_inode_operations = {
  109. .listxattr = jfs_listxattr,
  110. .setattr = jfs_setattr,
  111. #ifdef CONFIG_JFS_POSIX_ACL
  112. .get_acl = jfs_get_acl,
  113. .set_acl = jfs_set_acl,
  114. #endif
  115. };
  116. const struct file_operations jfs_file_operations = {
  117. .open = jfs_open,
  118. .llseek = generic_file_llseek,
  119. .read_iter = generic_file_read_iter,
  120. .write_iter = generic_file_write_iter,
  121. .mmap = generic_file_mmap,
  122. .splice_read = generic_file_splice_read,
  123. .splice_write = iter_file_splice_write,
  124. .fsync = jfs_fsync,
  125. .release = jfs_release,
  126. .unlocked_ioctl = jfs_ioctl,
  127. #ifdef CONFIG_COMPAT
  128. .compat_ioctl = jfs_compat_ioctl,
  129. #endif
  130. };