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-rw-r--r--fs/utimes.c114
1 files changed, 65 insertions, 49 deletions
diff --git a/fs/utimes.c b/fs/utimes.c
index ecf8941ba34a..8e09dbdfd7f5 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -48,54 +48,15 @@ static bool nsec_valid(long nsec)
48 return nsec >= 0 && nsec <= 999999999; 48 return nsec >= 0 && nsec <= 999999999;
49} 49}
50 50
51/* If times==NULL, set access and modification to current time, 51static int utimes_common(struct path *path, struct timespec *times)
52 * must be owner or have write permission.
53 * Else, update from *times, must be owner or super user.
54 */
55long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags)
56{ 52{
57 int error; 53 int error;
58 struct nameidata nd;
59 struct dentry *dentry;
60 struct inode *inode;
61 struct iattr newattrs; 54 struct iattr newattrs;
62 struct file *f = NULL; 55 struct inode *inode = path->dentry->d_inode;
63 struct vfsmount *mnt;
64
65 error = -EINVAL;
66 if (times && (!nsec_valid(times[0].tv_nsec) ||
67 !nsec_valid(times[1].tv_nsec))) {
68 goto out;
69 }
70
71 if (flags & ~AT_SYMLINK_NOFOLLOW)
72 goto out;
73
74 if (filename == NULL && dfd != AT_FDCWD) {
75 error = -EINVAL;
76 if (flags & AT_SYMLINK_NOFOLLOW)
77 goto out;
78
79 error = -EBADF;
80 f = fget(dfd);
81 if (!f)
82 goto out;
83 dentry = f->f_path.dentry;
84 mnt = f->f_path.mnt;
85 } else {
86 error = __user_walk_fd(dfd, filename, (flags & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW, &nd);
87 if (error)
88 goto out;
89
90 dentry = nd.path.dentry;
91 mnt = nd.path.mnt;
92 }
93
94 inode = dentry->d_inode;
95 56
96 error = mnt_want_write(mnt); 57 error = mnt_want_write(path->mnt);
97 if (error) 58 if (error)
98 goto dput_and_out; 59 goto out;
99 60
100 if (times && times[0].tv_nsec == UTIME_NOW && 61 if (times && times[0].tv_nsec == UTIME_NOW &&
101 times[1].tv_nsec == UTIME_NOW) 62 times[1].tv_nsec == UTIME_NOW)
@@ -145,15 +106,70 @@ long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags
145 } 106 }
146 } 107 }
147 mutex_lock(&inode->i_mutex); 108 mutex_lock(&inode->i_mutex);
148 error = notify_change(dentry, &newattrs); 109 error = notify_change(path->dentry, &newattrs);
149 mutex_unlock(&inode->i_mutex); 110 mutex_unlock(&inode->i_mutex);
111
150mnt_drop_write_and_out: 112mnt_drop_write_and_out:
151 mnt_drop_write(mnt); 113 mnt_drop_write(path->mnt);
152dput_and_out: 114out:
153 if (f) 115 return error;
154 fput(f); 116}
155 else 117
118/*
119 * do_utimes - change times on filename or file descriptor
120 * @dfd: open file descriptor, -1 or AT_FDCWD
121 * @filename: path name or NULL
122 * @times: new times or NULL
123 * @flags: zero or more flags (only AT_SYMLINK_NOFOLLOW for the moment)
124 *
125 * If filename is NULL and dfd refers to an open file, then operate on
126 * the file. Otherwise look up filename, possibly using dfd as a
127 * starting point.
128 *
129 * If times==NULL, set access and modification to current time,
130 * must be owner or have write permission.
131 * Else, update from *times, must be owner or super user.
132 */
133long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags)
134{
135 int error = -EINVAL;
136
137 if (times && (!nsec_valid(times[0].tv_nsec) ||
138 !nsec_valid(times[1].tv_nsec))) {
139 goto out;
140 }
141
142 if (flags & ~AT_SYMLINK_NOFOLLOW)
143 goto out;
144
145 if (filename == NULL && dfd != AT_FDCWD) {
146 struct file *file;
147
148 if (flags & AT_SYMLINK_NOFOLLOW)
149 goto out;
150
151 file = fget(dfd);
152 error = -EBADF;
153 if (!file)
154 goto out;
155
156 error = utimes_common(&file->f_path, times);
157 fput(file);
158 } else {
159 struct nameidata nd;
160 int lookup_flags = 0;
161
162 if (!(flags & AT_SYMLINK_NOFOLLOW))
163 lookup_flags |= LOOKUP_FOLLOW;
164
165 error = __user_walk_fd(dfd, filename, lookup_flags, &nd);
166 if (error)
167 goto out;
168
169 error = utimes_common(&nd.path, times);
156 path_put(&nd.path); 170 path_put(&nd.path);
171 }
172
157out: 173out:
158 return error; 174 return error;
159} 175}