file.c 3.8 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 user_namespace *mnt_userns, struct dentry *dentry,
  76. struct iattr *iattr)
  77. {
  78. struct inode *inode = d_inode(dentry);
  79. int rc;
  80. rc = setattr_prepare(&init_user_ns, dentry, iattr);
  81. if (rc)
  82. return rc;
  83. if (is_quota_modification(mnt_userns, inode, iattr)) {
  84. rc = dquot_initialize(inode);
  85. if (rc)
  86. return rc;
  87. }
  88. if ((iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) ||
  89. (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))) {
  90. rc = dquot_transfer(mnt_userns, inode, iattr);
  91. if (rc)
  92. return rc;
  93. }
  94. if ((iattr->ia_valid & ATTR_SIZE) &&
  95. iattr->ia_size != i_size_read(inode)) {
  96. inode_dio_wait(inode);
  97. rc = inode_newsize_ok(inode, iattr->ia_size);
  98. if (rc)
  99. return rc;
  100. truncate_setsize(inode, iattr->ia_size);
  101. jfs_truncate(inode);
  102. }
  103. setattr_copy(&init_user_ns, inode, iattr);
  104. mark_inode_dirty(inode);
  105. if (iattr->ia_valid & ATTR_MODE)
  106. rc = posix_acl_chmod(&init_user_ns, inode, inode->i_mode);
  107. return rc;
  108. }
  109. const struct inode_operations jfs_file_inode_operations = {
  110. .listxattr = jfs_listxattr,
  111. .setattr = jfs_setattr,
  112. .fileattr_get = jfs_fileattr_get,
  113. .fileattr_set = jfs_fileattr_set,
  114. #ifdef CONFIG_JFS_POSIX_ACL
  115. .get_acl = jfs_get_acl,
  116. .set_acl = jfs_set_acl,
  117. #endif
  118. };
  119. const struct file_operations jfs_file_operations = {
  120. .open = jfs_open,
  121. .llseek = generic_file_llseek,
  122. .read_iter = generic_file_read_iter,
  123. .write_iter = generic_file_write_iter,
  124. .mmap = generic_file_mmap,
  125. .splice_read = generic_file_splice_read,
  126. .splice_write = iter_file_splice_write,
  127. .fsync = jfs_fsync,
  128. .release = jfs_release,
  129. .unlocked_ioctl = jfs_ioctl,
  130. .compat_ioctl = compat_ptr_ioctl,
  131. };