cregit-Linux how code gets into the kernel

Release 4.7 fs/stat.c

Directory: fs
/*
 *  linux/fs/stat.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

#include <linux/export.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/file.h>
#include <linux/highuid.h>
#include <linux/fs.h>
#include <linux/namei.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/pagemap.h>

#include <asm/uaccess.h>
#include <asm/unistd.h>


void generic_fillattr(struct inode *inode, struct kstat *stat) { stat->dev = inode->i_sb->s_dev; stat->ino = inode->i_ino; stat->mode = inode->i_mode; stat->nlink = inode->i_nlink; stat->uid = inode->i_uid; stat->gid = inode->i_gid; stat->rdev = inode->i_rdev; stat->size = i_size_read(inode); stat->atime = inode->i_atime; stat->mtime = inode->i_mtime; stat->ctime = inode->i_ctime; stat->blksize = (1 << inode->i_blkbits); stat->blocks = inode->i_blocks; }

Contributors

PersonTokensPropCommitsCommitProp
al viroal viro5442.86%225.00%
pre-gitpre-git5342.06%450.00%
linus torvaldslinus torvalds1612.70%112.50%
andries brouwerandries brouwer32.38%112.50%
Total126100.00%8100.00%

EXPORT_SYMBOL(generic_fillattr); /** * vfs_getattr_nosec - getattr without security checks * @path: file to get attributes from * @stat: structure to return attributes in * * Get attributes without calling security_inode_getattr. * * Currently the only caller other than vfs_getattr is internal to the * filehandle lookup code, which uses only the inode number and returns * no attributes to any user. Any other code probably wants * vfs_getattr. */
int vfs_getattr_nosec(struct path *path, struct kstat *stat) { struct inode *inode = d_backing_inode(path->dentry); if (inode->i_op->getattr) return inode->i_op->getattr(path->mnt, path->dentry, stat); generic_fillattr(inode, stat); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
al viroal viro5180.95%228.57%
pre-gitpre-git812.70%342.86%
david howellsdavid howells34.76%114.29%
j. bruce fieldsj. bruce fields11.59%114.29%
Total63100.00%7100.00%

EXPORT_SYMBOL(vfs_getattr_nosec);
int vfs_getattr(struct path *path, struct kstat *stat) { int retval; retval = security_inode_getattr(path); if (retval) return retval; return vfs_getattr_nosec(path, stat); }

Contributors

PersonTokensPropCommitsCommitProp
j. bruce fieldsj. bruce fields40100.00%1100.00%
Total40100.00%1100.00%

EXPORT_SYMBOL(vfs_getattr);
int vfs_fstat(unsigned int fd, struct kstat *stat) { struct fd f = fdget_raw(fd); int error = -EBADF; if (f.file) { error = vfs_getattr(&f.file->f_path, stat); fdput(f); } return error; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git2949.15%650.00%
christoph hellwigchristoph hellwig1627.12%18.33%
al viroal viro1322.03%433.33%
ulrich drepperulrich drepper11.69%18.33%
Total59100.00%12100.00%

EXPORT_SYMBOL(vfs_fstat);
int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat, int flag) { struct path path; int error = -EINVAL; unsigned int lookup_flags = 0; if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | AT_EMPTY_PATH)) != 0) goto out; if (!(flag & AT_SYMLINK_NOFOLLOW)) lookup_flags |= LOOKUP_FOLLOW; if (flag & AT_EMPTY_PATH) lookup_flags |= LOOKUP_EMPTY; retry: error = user_path_at(dfd, filename, lookup_flags, &path); if (error) goto out; error = vfs_getattr(&path, stat); path_put(&path); if (retry_estale(error, lookup_flags)) { lookup_flags |= LOOKUP_REVAL; goto retry; } out: return error; }

Contributors

PersonTokensPropCommitsCommitProp
christoph hellwigchristoph hellwig4732.87%15.26%
pre-gitpre-git2920.28%631.58%
al viroal viro2718.88%526.32%
jeff laytonjeff layton2114.69%15.26%
david howellsdavid howells96.29%210.53%
ulrich drepperulrich drepper64.20%15.26%
jan blunckjan blunck32.10%210.53%
linus torvaldslinus torvalds10.70%15.26%
Total143100.00%19100.00%

EXPORT_SYMBOL(vfs_fstatat);
int vfs_stat(const char __user *name, struct kstat *stat) { return vfs_fstatat(AT_FDCWD, name, stat, 0); }

Contributors

PersonTokensPropCommitsCommitProp
ulrich drepperulrich drepper2071.43%120.00%
pre-gitpre-git310.71%120.00%
christoph hellwigchristoph hellwig310.71%120.00%
al viroal viro13.57%120.00%
david howellsdavid howells13.57%120.00%
Total28100.00%5100.00%

EXPORT_SYMBOL(vfs_stat);
int vfs_lstat(const char __user *name, struct kstat *stat) { return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW); }

Contributors

PersonTokensPropCommitsCommitProp
oleg drokinoleg drokin2071.43%133.33%
christoph hellwigchristoph hellwig725.00%133.33%
david howellsdavid howells13.57%133.33%
Total28100.00%3100.00%

EXPORT_SYMBOL(vfs_lstat); #ifdef __ARCH_WANT_OLD_STAT /* * For backward compatibility? Maybe this should be moved * into arch/i386 instead? */
static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf) { static int warncount = 5; struct __old_kernel_stat tmp; if (warncount > 0) { warncount--; printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n", current->comm); } else if (warncount < 0) { /* it's laughable, but... */ warncount = 0; } memset(&tmp, 0, sizeof(struct __old_kernel_stat)); tmp.st_dev = old_encode_dev(stat->dev); tmp.st_ino = stat->ino; if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) return -EOVERFLOW; tmp.st_mode = stat->mode; tmp.st_nlink = stat->nlink; if (tmp.st_nlink != stat->nlink) return -EOVERFLOW; SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); tmp.st_rdev = old_encode_dev(stat->rdev); #if BITS_PER_LONG == 32 if (stat->size > MAX_NON_LFS) return -EOVERFLOW; #endif tmp.st_size = stat->size; tmp.st_atime = stat->atime.tv_sec; tmp.st_mtime = stat->mtime.tv_sec; tmp.st_ctime = stat->ctime.tv_sec; return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; }

Contributors

PersonTokensPropCommitsCommitProp
al viroal viro15757.30%210.00%
pre-gitpre-git3613.14%1155.00%
david howellsdavid howells2810.22%15.00%
alan coxalan cox145.11%15.00%
chris wedgwoodchris wedgwood145.11%15.00%
eric w. biedermaneric w. biederman124.38%15.00%
andi kleenandi kleen124.38%210.00%
linus torvaldslinus torvalds10.36%15.00%
Total274100.00%20100.00%

SYSCALL_DEFINE2(stat, const char __user *, filename, struct __old_kernel_stat __user *, statbuf) { struct kstat stat; int error; error = vfs_stat(filename, &stat); if (error) return error; return cp_old_stat(&stat, statbuf); } SYSCALL_DEFINE2(lstat, const char __user *, filename, struct __old_kernel_stat __user *, statbuf) { struct kstat stat; int error; error = vfs_lstat(filename, &stat); if (error) return error; return cp_old_stat(&stat, statbuf); } SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf) { struct kstat stat; int error = vfs_fstat(fd, &stat); if (!error) error = cp_old_stat(&stat, statbuf); return error; } #endif /* __ARCH_WANT_OLD_STAT */ #if BITS_PER_LONG == 32 # define choose_32_64(a,b) a #else # define choose_32_64(a,b) b #endif #define valid_dev(x) choose_32_64(old_valid_dev(x),true) #define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x) #ifndef INIT_STRUCT_STAT_PADDING # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st)) #endif
static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf) { struct stat tmp; if (!valid_dev(stat->dev) || !valid_dev(stat->rdev)) return -EOVERFLOW; #if BITS_PER_LONG == 32 if (stat->size > MAX_NON_LFS) return -EOVERFLOW; #endif INIT_STRUCT_STAT_PADDING(tmp); tmp.st_dev = encode_dev(stat->dev); tmp.st_ino = stat->ino; if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) return -EOVERFLOW; tmp.st_mode = stat->mode; tmp.st_nlink = stat->nlink; if (tmp.st_nlink != stat->nlink) return -EOVERFLOW; SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid)); SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid)); tmp.st_rdev = encode_dev(stat->rdev); tmp.st_size = stat->size; tmp.st_atime = stat->atime.tv_sec; tmp.st_mtime = stat->mtime.tv_sec; tmp.st_ctime = stat->ctime.tv_sec; #ifdef STAT_HAVE_NSEC tmp.st_atime_nsec = stat->atime.tv_nsec; tmp.st_mtime_nsec = stat->mtime.tv_nsec; tmp.st_ctime_nsec = stat->ctime.tv_nsec; #endif tmp.st_blocks = stat->blocks; tmp.st_blksize = stat->blksize; return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; }

Contributors

PersonTokensPropCommitsCommitProp
al viroal viro17558.92%321.43%
andi kleenandi kleen4715.82%214.29%
david howellsdavid howells289.43%17.14%
linus torvaldslinus torvalds144.71%321.43%
chris wedgwoodchris wedgwood144.71%17.14%
eric w. biedermaneric w. biederman124.04%17.14%
pre-gitpre-git72.36%321.43%
Total297100.00%14100.00%

SYSCALL_DEFINE2(newstat, const char __user *, filename, struct stat __user *, statbuf) { struct kstat stat; int error = vfs_stat(filename, &stat); if (error) return error; return cp_new_stat(&stat, statbuf); } SYSCALL_DEFINE2(newlstat, const char __user *, filename, struct stat __user *, statbuf) { struct kstat stat; int error; error = vfs_lstat(filename, &stat); if (error) return error; return cp_new_stat(&stat, statbuf); } #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT) SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename, struct stat __user *, statbuf, int, flag) { struct kstat stat; int error; error = vfs_fstatat(dfd, filename, &stat, flag); if (error) return error; return cp_new_stat(&stat, statbuf); } #endif SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf) { struct kstat stat; int error = vfs_fstat(fd, &stat); if (!error) error = cp_new_stat(&stat, statbuf); return error; } SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname, char __user *, buf, int, bufsiz) { struct path path; int error; int empty = 0; unsigned int lookup_flags = LOOKUP_EMPTY; if (bufsiz <= 0) return -EINVAL; retry: error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty); if (!error) { struct inode *inode = d_backing_inode(path.dentry); error = empty ? -ENOENT : -EINVAL; if (inode->i_op->readlink) { error = security_inode_readlink(path.dentry); if (!error) { touch_atime(&path); error = inode->i_op->readlink(path.dentry, buf, bufsiz); } } path_put(&path); if (retry_estale(error, lookup_flags)) { lookup_flags |= LOOKUP_REVAL; goto retry; } } return error; } SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf, int, bufsiz) { return sys_readlinkat(AT_FDCWD, path, buf, bufsiz); } /* ---------- LFS-64 ----------- */ #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64) #ifndef INIT_STRUCT_STAT64_PADDING # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st)) #endif
static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf) { struct stat64 tmp; INIT_STRUCT_STAT64_PADDING(tmp); #ifdef CONFIG_MIPS /* mips has weird padding, so we don't get 64 bits there */ tmp.st_dev = new_encode_dev(stat->dev); tmp.st_rdev = new_encode_dev(stat->rdev); #else tmp.st_dev = huge_encode_dev(stat->dev); tmp.st_rdev = huge_encode_dev(stat->rdev); #endif tmp.st_ino = stat->ino; if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) return -EOVERFLOW; #ifdef STAT64_HAS_BROKEN_ST_INO tmp.__st_ino = stat->ino; #endif tmp.st_mode = stat->mode; tmp.st_nlink = stat->nlink; tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); tmp.st_atime = stat->atime.tv_sec; tmp.st_atime_nsec = stat->atime.tv_nsec; tmp.st_mtime = stat->mtime.tv_sec; tmp.st_mtime_nsec = stat->mtime.tv_nsec; tmp.st_ctime = stat->ctime.tv_sec; tmp.st_ctime_nsec = stat->ctime.tv_nsec; tmp.st_size = stat->size; tmp.st_blocks = stat->blocks; tmp.st_blksize = stat->blksize; return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; }

Contributors

PersonTokensPropCommitsCommitProp
al viroal viro10136.86%330.00%
pre-gitpre-git9534.67%220.00%
andi kleenandi kleen3613.14%110.00%
david howellsdavid howells2810.22%110.00%
eric w. biedermaneric w. biederman124.38%110.00%
linus torvaldslinus torvalds20.73%220.00%
Total274100.00%10100.00%

SYSCALL_DEFINE2(stat64, const char __user *, filename, struct stat64 __user *, statbuf) { struct kstat stat; int error = vfs_stat(filename, &stat); if (!error) error = cp_new_stat64(&stat, statbuf); return error; } SYSCALL_DEFINE2(lstat64, const char __user *, filename, struct stat64 __user *, statbuf) { struct kstat stat; int error = vfs_lstat(filename, &stat); if (!error) error = cp_new_stat64(&stat, statbuf); return error; } SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf) { struct kstat stat; int error = vfs_fstat(fd, &stat); if (!error) error = cp_new_stat64(&stat, statbuf); return error; } SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename, struct stat64 __user *, statbuf, int, flag) { struct kstat stat; int error; error = vfs_fstatat(dfd, filename, &stat, flag); if (error) return error; return cp_new_stat64(&stat, statbuf); } #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */ /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
void __inode_add_bytes(struct inode *inode, loff_t bytes) { inode->i_blocks += bytes >> 9; bytes &= 511; inode->i_bytes += bytes; if (inode->i_bytes >= 512) { inode->i_blocks++; inode->i_bytes -= 512; } }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton5096.15%150.00%
dmitriy monakhovdmitriy monakhov23.85%150.00%
Total52100.00%2100.00%


void inode_add_bytes(struct inode *inode, loff_t bytes) { spin_lock(&inode->i_lock); __inode_add_bytes(inode, bytes); spin_unlock(&inode->i_lock); }

Contributors

PersonTokensPropCommitsCommitProp
dmitriy monakhovdmitriy monakhov2775.00%150.00%
andrew mortonandrew morton925.00%150.00%
Total36100.00%2100.00%

EXPORT_SYMBOL(inode_add_bytes);
void __inode_sub_bytes(struct inode *inode, loff_t bytes) { inode->i_blocks -= bytes >> 9; bytes &= 511; if (inode->i_bytes < bytes) { inode->i_blocks--; inode->i_bytes += 512; } inode->i_bytes -= bytes; }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton5096.15%150.00%
jan karajan kara23.85%150.00%
Total52100.00%2100.00%

EXPORT_SYMBOL(__inode_sub_bytes);
void inode_sub_bytes(struct inode *inode, loff_t bytes) { spin_lock(&inode->i_lock); __inode_sub_bytes(inode, bytes); spin_unlock(&inode->i_lock); }

Contributors

PersonTokensPropCommitsCommitProp
jan karajan kara2775.00%150.00%
andrew mortonandrew morton925.00%150.00%
Total36100.00%2100.00%

EXPORT_SYMBOL(inode_sub_bytes);
loff_t inode_get_bytes(struct inode *inode) { loff_t ret; spin_lock(&inode->i_lock); ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes; spin_unlock(&inode->i_lock); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton51100.00%1100.00%
Total51100.00%1100.00%

EXPORT_SYMBOL(inode_get_bytes);
void inode_set_bytes(struct inode *inode, loff_t bytes) { /* Caller is here responsible for sufficient locking * (ie. inode->i_lock) */ inode->i_blocks = bytes >> 9; inode->i_bytes = bytes & 511; }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton30100.00%2100.00%
Total30100.00%2100.00%

EXPORT_SYMBOL(inode_set_bytes);

Overall Contributors

PersonTokensPropCommitsCommitProp
al viroal viro71928.40%1113.25%
pre-gitpre-git50920.10%2631.33%
andrew mortonandrew morton2078.18%33.61%
heiko carstensheiko carstens1766.95%44.82%
ulrich drepperulrich drepper1154.54%22.41%
christoph hellwigchristoph hellwig1124.42%22.41%
david howellsdavid howells1094.30%44.82%
linus torvaldslinus torvalds1003.95%56.02%
andi kleenandi kleen953.75%22.41%
jeff laytonjeff layton481.90%22.41%
j. bruce fieldsj. bruce fields471.86%11.20%
arnaldo carvalho de meloarnaldo carvalho de melo401.58%11.20%
eric w. biedermaneric w. biederman361.42%11.20%
oleg drokinoleg drokin341.34%11.20%
jan karajan kara341.34%11.20%
dmitriy monakhovdmitriy monakhov301.18%11.20%
chris wedgwoodchris wedgwood281.11%11.20%
alan coxalan cox140.55%11.20%
andy whitcroftandy whitcroft140.55%11.20%
jan blunckjan blunck120.47%22.41%
andreas schwabandreas schwab110.43%11.20%
stephen d. smalleystephen d. smalley110.43%11.20%
catalin marinascatalin marinas110.43%11.20%
greg kroah-hartmangreg kroah-hartman60.24%22.41%
dave jonesdave jones30.12%11.20%
arnd bergmannarnd bergmann30.12%11.20%
theodore tsotheodore tso30.12%11.20%
andries brouwerandries brouwer30.12%11.20%
yaowei baiyaowei bai10.04%11.20%
paul gortmakerpaul gortmaker10.04%11.20%
Total2532100.00%83100.00%
Directory: fs
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