| Message ID | 1487460608-15697-5-git-send-email-deepa.kernel@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Deepa, [auto build test WARNING on linus/master] [also build test WARNING on v4.10-rc8 next-20170217] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Deepa-Dinamani/vfs-Add-timestamp-range-check-support/20170219-073734 reproduce: make htmldocs All warnings (new ones prefixed by >>): fs/inode.c:1679: warning: No description found for parameter 'rcu' fs/inode.c:2125: warning: No description found for parameter 'inode' >> fs/inode.c:2125: warning: Excess function parameter 'gran' description in 'timestamp_truncate' include/linux/jbd2.h:442: warning: No description found for parameter 'i_transaction' include/linux/jbd2.h:442: warning: No description found for parameter 'i_next_transaction' include/linux/jbd2.h:442: warning: No description found for parameter 'i_list' include/linux/jbd2.h:442: warning: No description found for parameter 'i_vfs_inode' include/linux/jbd2.h:442: warning: No description found for parameter 'i_flags' include/linux/jbd2.h:494: warning: No description found for parameter 'h_rsv_handle' include/linux/jbd2.h:494: warning: No description found for parameter 'h_reserved' include/linux/jbd2.h:494: warning: No description found for parameter 'h_type' include/linux/jbd2.h:494: warning: No description found for parameter 'h_line_no' include/linux/jbd2.h:494: warning: No description found for parameter 'h_start_jiffies' include/linux/jbd2.h:494: warning: No description found for parameter 'h_requested_credits' include/linux/jbd2.h:1047: warning: No description found for parameter 'j_chkpt_bhs[JBD2_NR_BATCH]' include/linux/jbd2.h:1047: warning: No description found for parameter 'j_devname[BDEVNAME_SIZE+24]' include/linux/jbd2.h:1047: warning: No description found for parameter 'j_average_commit_time' include/linux/jbd2.h:1047: warning: No description found for parameter 'j_min_batch_time' include/linux/jbd2.h:1047: warning: No description found for parameter 'j_max_batch_time' include/linux/jbd2.h:1047: warning: No description found for parameter 'j_commit_callback' include/linux/jbd2.h:1047: warning: No description found for parameter 'j_failed_commit' include/linux/jbd2.h:1047: warning: No description found for parameter 'j_chksum_driver' include/linux/jbd2.h:1047: warning: No description found for parameter 'j_csum_seed' fs/jbd2/transaction.c:428: warning: No description found for parameter 'rsv_blocks' fs/jbd2/transaction.c:428: warning: No description found for parameter 'gfp_mask' fs/jbd2/transaction.c:428: warning: No description found for parameter 'type' fs/jbd2/transaction.c:428: warning: No description found for parameter 'line_no' fs/jbd2/transaction.c:504: warning: No description found for parameter 'type' fs/jbd2/transaction.c:504: warning: No description found for parameter 'line_no' fs/jbd2/transaction.c:634: warning: No description found for parameter 'gfp_mask' vim +2125 fs/inode.c 2109 2110 void inode_nohighmem(struct inode *inode) 2111 { 2112 mapping_set_gfp_mask(inode->i_mapping, GFP_USER); 2113 } 2114 EXPORT_SYMBOL(inode_nohighmem); 2115 2116 /** 2117 * fs_timespec_trunc - Truncate timespec to a granularity 2118 * @t: Timespec 2119 * @gran: Granularity in ns. 2120 * 2121 * Truncate a timespec to a granularity. Always rounds down. gran must 2122 * not be 0 nor greater than a second (NSEC_PER_SEC, or 10^9 ns). 2123 */ 2124 struct timespec timestamp_truncate(struct timespec t, struct inode *inode) > 2125 { 2126 struct super_block *sb = inode->i_sb; 2127 unsigned int gran = sb->s_time_gran; 2128 2129 t.tv_sec = clamp_t(time64_t, t.tv_sec, sb->s_time_min, sb->s_time_max); 2130 2131 /* Avoid division in the common cases 1 ns and 1 s. */ 2132 if (gran == 1) { 2133 /* nothing */ --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
>>> fs/inode.c:2125: warning: Excess function parameter 'gran' description in 'timestamp_truncate' > 2116 /** > 2117 * fs_timespec_trunc - Truncate timespec to a granularity > 2118 * @t: Timespec > 2119 * @gran: Granularity in ns. > 2120 * > 2121 * Truncate a timespec to a granularity. Always rounds down. gran must > 2122 * not be 0 nor greater than a second (NSEC_PER_SEC, or 10^9 ns). > 2123 */ > 2124 struct timespec timestamp_truncate(struct timespec t, struct inode *inode) >> 2125 { > 2126 struct super_block *sb = inode->i_sb; > 2127 unsigned int gran = sb->s_time_gran; This because the comment does not match the actual function signature: The gran param mentioned in the comment is not actually part of function signature. I will fix the comment in the next version. -Deepa
diff --git a/fs/inode.c b/fs/inode.c index 0573a3e..6a1bc12 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -2114,6 +2114,36 @@ void inode_nohighmem(struct inode *inode) EXPORT_SYMBOL(inode_nohighmem); /** + * fs_timespec_trunc - Truncate timespec to a granularity + * @t: Timespec + * @gran: Granularity in ns. + * + * Truncate a timespec to a granularity. Always rounds down. gran must + * not be 0 nor greater than a second (NSEC_PER_SEC, or 10^9 ns). + */ +struct timespec timestamp_truncate(struct timespec t, struct inode *inode) +{ + struct super_block *sb = inode->i_sb; + unsigned int gran = sb->s_time_gran; + + t.tv_sec = clamp_t(time64_t, t.tv_sec, sb->s_time_min, sb->s_time_max); + + /* Avoid division in the common cases 1 ns and 1 s. */ + if (gran == 1) { + /* nothing */ + } else if (gran == NSEC_PER_SEC) { + t.tv_nsec = 0; + } else if (gran > 1 && gran < NSEC_PER_SEC) { + t.tv_nsec -= t.tv_nsec % gran; + } else { + WARN(1, "illegal file time granularity: %u", gran); + } + return t; +} +EXPORT_SYMBOL(timestamp_truncate); + + +/** * current_time - Return FS time * @inode: inode. * @@ -2132,6 +2162,6 @@ struct timespec current_time(struct inode *inode) return now; } - return timespec_trunc(now, inode->i_sb->s_time_gran); + return timestamp_truncate(now, inode); } EXPORT_SYMBOL(current_time);
timespec_trunc() function is used to truncate a filesystem timestamp to the right granularity. But, the function does not clamp tv_sec part of the timestamps according to the filesystem timestamp limits. Also, timespec_trunc() is exclusively used for filesystem timestamps. Move the api to be part of vfs. The replacement api: timestamp_truncate() also alters the signature of the function to accommodate filesystem timestamp clamping according to flesystem limits. Note that the clamp_t macro is used for clamping here as vfs is not yet using struct timespec64 internally. This is required for compilation purposes. Also note that clamp won't do the right thing for timestamps beyond 2038 on 32-bit machines until the vfs uses timespec64. After the vfs is transitioned to use timespec64 for timestamps, clamp_t() can be replaced by clamp(). Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> --- fs/inode.c | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-)