cregit-Linux how code gets into the kernel

Release 4.10 fs/hugetlbfs/inode.c

Directory: fs/hugetlbfs
/*
 * hugetlbpage-backed filesystem.  Based on ramfs.
 *
 * Nadia Yvette Chambers, 2002
 *
 * Copyright (C) 2002 Linus Torvalds.
 * License: GPL
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/thread_info.h>
#include <asm/current.h>
#include <linux/sched.h>		/* remove ASAP */
#include <linux/falloc.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/file.h>
#include <linux/kernel.h>
#include <linux/writeback.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/capability.h>
#include <linux/ctype.h>
#include <linux/backing-dev.h>
#include <linux/hugetlb.h>
#include <linux/pagevec.h>
#include <linux/parser.h>
#include <linux/mman.h>
#include <linux/slab.h>
#include <linux/dnotify.h>
#include <linux/statfs.h>
#include <linux/security.h>
#include <linux/magic.h>
#include <linux/migrate.h>
#include <linux/uio.h>

#include <linux/uaccess.h>


static const struct super_operations hugetlbfs_ops;

static const struct address_space_operations hugetlbfs_aops;

const struct file_operations hugetlbfs_file_operations;

static const struct inode_operations hugetlbfs_dir_inode_operations;

static const struct inode_operations hugetlbfs_inode_operations;


struct hugetlbfs_config {
	
kuid_t   uid;
	
kgid_t   gid;
	
umode_t mode;
	
long	max_hpages;
	
long	nr_inodes;
	
struct hstate *hstate;
	
long    min_hpages;
};


struct hugetlbfs_inode_info {
	
struct shared_policy policy;
	
struct inode vfs_inode;
};


static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) { return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); }

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david gibsondavid gibson25100.00%1100.00%
Total25100.00%1100.00%

int sysctl_hugetlb_shm_group; enum { Opt_size, Opt_nr_inodes, Opt_mode, Opt_uid, Opt_gid, Opt_pagesize, Opt_min_size, Opt_err, }; static const match_table_t tokens = { {Opt_size, "size=%s"}, {Opt_nr_inodes, "nr_inodes=%s"}, {Opt_mode, "mode=%o"}, {Opt_uid, "uid=%u"}, {Opt_gid, "gid=%u"}, {Opt_pagesize, "pagesize=%s"}, {Opt_min_size, "min_size=%s"}, {Opt_err, NULL}, }; #ifdef CONFIG_NUMA
static inline void hugetlb_set_vma_policy(struct vm_area_struct *vma, struct inode *inode, pgoff_t index) { vma->vm_policy = mpol_shared_policy_lookup(&HUGETLBFS_I(inode)->policy, index); }

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mike kravetzmike kravetz37100.00%1100.00%
Total37100.00%1100.00%


static inline void hugetlb_drop_vma_policy(struct vm_area_struct *vma) { mpol_cond_put(vma->vm_policy); }

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mike kravetzmike kravetz19100.00%1100.00%
Total19100.00%1100.00%

#else
static inline void hugetlb_set_vma_policy(struct vm_area_struct *vma, struct inode *inode, pgoff_t index) { }

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mike kravetzmike kravetz19100.00%1100.00%
Total19100.00%1100.00%


static inline void hugetlb_drop_vma_policy(struct vm_area_struct *vma) { }

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mike kravetzmike kravetz11100.00%1100.00%
Total11100.00%1100.00%

#endif
static void huge_pagevec_release(struct pagevec *pvec) { int i; for (i = 0; i < pagevec_count(pvec); ++i) put_page(pvec->pages[i]); pagevec_reinit(pvec); }

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adam litkeadam litke45100.00%1100.00%
Total45100.00%1100.00%


static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma) { struct inode *inode = file_inode(file); loff_t len, vma_len; int ret; struct hstate *h = hstate_file(file); /* * vma address alignment (but not the pgoff alignment) has * already been checked by prepare_hugepage_range. If you add * any error returns here, do so after setting VM_HUGETLB, so * is_vm_hugetlb_page tests below unmap_region go the right * way when do_mmap_pgoff unwinds (may be important on powerpc * and ia64). */ vma->vm_flags |= VM_HUGETLB | VM_DONTEXPAND; vma->vm_ops = &hugetlb_vm_ops; if (vma->vm_pgoff & (~huge_page_mask(h) >> PAGE_SHIFT)) return -EINVAL; vma_len = (loff_t)(vma->vm_end - vma->vm_start); inode_lock(inode); file_accessed(file); ret = -ENOMEM; len = vma_len + ((loff_t)vma->vm_pgoff << PAGE_SHIFT); if (hugetlb_reserve_pages(inode, vma->vm_pgoff >> huge_page_order(h), len >> huge_page_shift(h), vma, vma->vm_flags)) goto out; ret = 0; if (vma->vm_flags & VM_WRITE && inode->i_size < len) inode->i_size = len; out: inode_unlock(inode); return ret; }

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andrew mortonandrew morton9750.79%421.05%
david gibsondavid gibson2513.09%210.53%
andi kleenandi kleen2211.52%15.26%
hugh dickinshugh dickins94.71%15.26%
oleg nesterovoleg nesterov84.19%15.26%
al viroal viro73.66%315.79%
kenneth w. chenkenneth w. chen73.66%15.26%
yanmin zhangyanmin zhang63.14%15.26%
mel gormanmel gorman63.14%210.53%
adam litkeadam litke21.05%15.26%
konstantin khlebnikovkonstantin khlebnikov10.52%15.26%
becky brucebecky bruce10.52%15.26%
Total191100.00%19100.00%

/* * Called under down_write(mmap_sem). */ #ifndef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
static unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma; struct hstate *h = hstate_file(file); struct vm_unmapped_area_info info; if (len & ~huge_page_mask(h)) return -EINVAL; if (len > TASK_SIZE) return -ENOMEM; if (flags & MAP_FIXED) { if (prepare_hugepage_range(file, addr, len)) return -EINVAL; return addr; } if (addr) { addr = ALIGN(addr, huge_page_size(h)); vma = find_vma(mm, addr); if (TASK_SIZE - len >= addr && (!vma || addr + len <= vma->vm_start)) return addr; } info.flags = 0; info.length = len; info.low_limit = TASK_UNMAPPED_BASE; info.high_limit = TASK_SIZE; info.align_mask = PAGE_MASK & ~huge_page_mask(h); info.align_offset = 0; return vm_unmapped_area(&info); }

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andrew mortonandrew morton11254.37%114.29%
michel lespinassemichel lespinasse3516.99%114.29%
benjamin herrenschmidtbenjamin herrenschmidt2411.65%114.29%
andi kleenandi kleen2411.65%114.29%
xiao guangrongxiao guangrong73.40%114.29%
wolfgang wanderwolfgang wander31.46%114.29%
yanmin zhangyanmin zhang10.49%114.29%
Total206100.00%7100.00%

#endif
static size_t hugetlbfs_read_actor(struct page *page, unsigned long offset, struct iov_iter *to, unsigned long size) { size_t copied = 0; int i, chunksize; /* Find which 4k chunk and offset with in that chunk */ i = offset >> PAGE_SHIFT; offset = offset & ~PAGE_MASK; while (size) { size_t n; chunksize = PAGE_SIZE; if (offset) chunksize -= offset; if (chunksize > size) chunksize = size; n = copy_page_to_iter(&page[i], offset, chunksize, to); copied += n; if (n != chunksize) return copied; offset = 0; size -= chunksize; i++; } return copied; }

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badari pulavartybadari pulavarty10081.30%133.33%
al viroal viro2016.26%133.33%
kirill a. shutemovkirill a. shutemov32.44%133.33%
Total123100.00%3100.00%

/* * Support for read() - Find the page attached to f_mapping and copy out the * data. Its *very* similar to do_generic_mapping_read(), we can't use that * since it has PAGE_SIZE assumptions. */
static ssize_t hugetlbfs_read_iter(struct kiocb *iocb, struct iov_iter *to) { struct file *file = iocb->ki_filp; struct hstate *h = hstate_file(file); struct address_space *mapping = file->f_mapping; struct inode *inode = mapping->host; unsigned long index = iocb->ki_pos >> huge_page_shift(h); unsigned long offset = iocb->ki_pos & ~huge_page_mask(h); unsigned long end_index; loff_t isize; ssize_t retval = 0; while (iov_iter_count(to)) { struct page *page; size_t nr, copied; /* nr is the maximum number of bytes to copy from this page */ nr = huge_page_size(h); isize = i_size_read(inode); if (!isize) break; end_index = (isize - 1) >> huge_page_shift(h); if (index > end_index) break; if (index == end_index) { nr = ((isize - 1) & ~huge_page_mask(h)) + 1; if (nr <= offset) break; } nr = nr - offset; /* Find the page */ page = find_lock_page(mapping, index); if (unlikely(page == NULL)) { /* * We have a HOLE, zero out the user-buffer for the * length of the hole or request. */ copied = iov_iter_zero(nr, to); } else { unlock_page(page); /* * We have the page, copy it to user space buffer. */ copied = hugetlbfs_read_actor(page, offset, to, nr); put_page(page); } offset += copied; retval += copied; if (copied != nr && iov_iter_count(to)) { if (!retval) retval = -EFAULT; break; } index += offset >> huge_page_shift(h); offset &= ~huge_page_mask(h); } iocb->ki_pos = ((loff_t)index << huge_page_shift(h)) + offset; return retval; }

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badari pulavartybadari pulavarty17956.11%116.67%
al viroal viro6520.38%116.67%
andi kleenandi kleen3711.60%116.67%
aneesh kumaraneesh kumar3510.97%116.67%
roel kluinroel kluin20.63%116.67%
kirill a. shutemovkirill a. shutemov10.31%116.67%
Total319100.00%6100.00%


static int hugetlbfs_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) { return -EINVAL; }

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andrew mortonandrew morton2152.50%150.00%
nick pigginnick piggin1947.50%150.00%
Total40100.00%2100.00%


static int hugetlbfs_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata) { BUG(); return -EINVAL; }

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andrew mortonandrew morton2151.22%150.00%
nick pigginnick piggin2048.78%150.00%
Total41100.00%2100.00%


static void remove_huge_page(struct page *page) { ClearPageDirty(page); ClearPageUptodate(page); delete_from_page_cache(page); }

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andrew mortonandrew morton2284.62%120.00%
konstantin khlebnikovkonstantin khlebnikov13.85%120.00%
minchan kimminchan kim13.85%120.00%
adrian bunkadrian bunk13.85%120.00%
mike kravetzmike kravetz13.85%120.00%
Total26100.00%5100.00%


static void hugetlb_vmdelete_list(struct rb_root *root, pgoff_t start, pgoff_t end) { struct vm_area_struct *vma; /* * end == 0 indicates that the entire range after * start should be unmapped. */ vma_interval_tree_foreach(vma, root, start, end ? end : ULONG_MAX) { unsigned long v_offset; unsigned long v_end; /* * Can the expression below overflow on 32-bit arches? * No, because the interval tree returns us only those vmas * which overlap the truncated area starting at pgoff, * and no vma on a 32-bit arch can span beyond the 4GB. */ if (vma->vm_pgoff < start) v_offset = (start - vma->vm_pgoff) << PAGE_SHIFT; else v_offset = 0; if (!end) v_end = vma->vm_end; else { v_end = ((end - vma->vm_pgoff) << PAGE_SHIFT) + vma->vm_start; if (v_end > vma->vm_end) v_end = vma->vm_end; } unmap_hugepage_range(vma, vma->vm_start + v_offset, v_end, NULL); } }

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mike kravetzmike kravetz130100.00%1100.00%
Total130100.00%1100.00%

/* * remove_inode_hugepages handles two distinct cases: truncation and hole * punch. There are subtle differences in operation for each case. * * truncation is indicated by end of range being LLONG_MAX * In this case, we first scan the range and release found pages. * After releasing pages, hugetlb_unreserve_pages cleans up region/reserv * maps and global counts. Page faults can not race with truncation * in this routine. hugetlb_no_page() prevents page faults in the * truncated range. It checks i_size before allocation, and again after * with the page table lock for the page held. The same lock must be * acquired to unmap a page. * hole punch is indicated if end is not LLONG_MAX * In the hole punch case we scan the range and release found pages. * Only when releasing a page is the associated region/reserv map * deleted. The region/reserv map for ranges without associated * pages are not modified. Page faults can race with hole punch. * This is indicated if we find a mapped page. * Note: If the passed end of range value is beyond the end of file, but * not LLONG_MAX this routine still performs a hole punch operation. */
static void remove_inode_hugepages(struct inode *inode, loff_t lstart, loff_t lend) { struct hstate *h = hstate_inode(inode); struct address_space *mapping = &inode->i_data; const pgoff_t start = lstart >> huge_page_shift(h); const pgoff_t end = lend >> huge_page_shift(h); struct vm_area_struct pseudo_vma; struct pagevec pvec; pgoff_t next; int i, freed = 0; long lookup_nr = PAGEVEC_SIZE; bool truncate_op = (lend == LLONG_MAX); memset(&pseudo_vma, 0, sizeof(struct vm_area_struct)); pseudo_vma.vm_flags = (VM_HUGETLB | VM_MAYSHARE | VM_SHARED); pagevec_init(&pvec, 0); next = start; while (next < end) { /* * Don't grab more pages than the number left in the range. */ if (end - next < lookup_nr) lookup_nr = end - next; /* * When no more pages are found, we are done. */ if (!pagevec_lookup(&pvec, mapping, next, lookup_nr)) break; for (i = 0; i < pagevec_count(&pvec); ++i) { struct page *page = pvec.pages[i]; u32 hash; /* * The page (index) could be beyond end. This is * only possible in the punch hole case as end is * max page offset in the truncate case. */ next = page->index; if (next >= end) break; hash = hugetlb_fault_mutex_hash(h, current->mm, &pseudo_vma, mapping, next, 0); mutex_lock(&hugetlb_fault_mutex_table[hash]); /* * If page is mapped, it was faulted in after being * unmapped in caller. Unmap (again) now after taking * the fault mutex. The mutex will prevent faults * until we finish removing the page. * * This race can only happen in the hole punch case. * Getting here in a truncate operation is a bug. */ if (unlikely(page_mapped(page))) { BUG_ON(truncate_op); i_mmap_lock_write(mapping); hugetlb_vmdelete_list(&mapping->i_mmap, next * pages_per_huge_page(h), (next + 1) * pages_per_huge_page(h)); i_mmap_unlock_write(mapping); } lock_page(page); /* * We must free the huge page and remove from page * cache (remove_huge_page) BEFORE removing the * region/reserve map (hugetlb_unreserve_pages). In * rare out of memory conditions, removal of the * region/reserve map could fail. Correspondingly, * the subpool and global reserve usage count can need * to be adjusted. */ VM_BUG_ON(PagePrivate(page)); remove_huge_page(page); freed++; if (!truncate_op) { if (unlikely(hugetlb_unreserve_pages(inode, next, next + 1, 1))) hugetlb_fix_reserve_counts(inode); } unlock_page(page); mutex_unlock(&hugetlb_fault_mutex_table[hash]); } ++next; huge_pagevec_release(&pvec); cond_resched(); } if (truncate_op) (void)hugetlb_unreserve_pages(inode, start, LONG_MAX, freed); }

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mike kravetzmike kravetz24762.37%330.00%
andrew mortonandrew morton10526.52%220.00%
andi kleenandi kleen143.54%110.00%
kenneth w. chenkenneth w. chen133.28%110.00%
david gibsondavid gibson123.03%110.00%
zhong jiangzhong jiang41.01%110.00%
adrian bunkadrian bunk10.25%110.00%
Total396100.00%10100.00%


static void hugetlbfs_evict_inode(struct inode *inode) { struct resv_map *resv_map; remove_inode_hugepages(inode, 0, LLONG_MAX); resv_map = (struct resv_map *)inode->i_mapping->private_data; /* root inode doesn't have the resv_map, so we should check it */ if (resv_map) resv_map_release(&resv_map->refs); clear_inode(inode); }

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joonsoo kimjoonsoo kim3155.36%116.67%
andrew mortonandrew morton1323.21%116.67%
christoph hellwigchristoph hellwig712.50%116.67%
mike kravetzmike kravetz35.36%116.67%
al viroal viro11.79%116.67%
jan karajan kara11.79%116.67%
Total56100.00%6100.00%


static int hugetlb_vmtruncate(struct inode *inode, loff_t offset) { pgoff_t pgoff; struct address_space *mapping = inode->i_mapping; struct hstate *h = hstate_inode(inode); BUG_ON(offset & ~huge_page_mask(h)); pgoff = offset >> PAGE_SHIFT; i_size_write(inode, offset); i_mmap_lock_write(mapping); if (!RB_EMPTY_ROOT(&mapping->i_mmap)) hugetlb_vmdelete_list(&mapping->i_mmap, pgoff, 0); i_mmap_unlock_write(mapping); remove_inode_hugepages(inode, offset, LLONG_MAX); return 0; }

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andrew mortonandrew morton7571.43%220.00%
andi kleenandi kleen1413.33%110.00%
mike kravetzmike kravetz65.71%220.00%
ken chenken chen43.81%110.00%
davidlohr buesodavidlohr bueso21.90%110.00%
hugh dickinshugh dickins21.90%110.00%
david gibsondavid gibson10.95%110.00%
michel lespinassemichel lespinasse10.95%110.00%
Total105100.00%10100.00%


static long hugetlbfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) { struct hstate *h = hstate_inode(inode); loff_t hpage_size = huge_page_size(h); loff_t hole_start, hole_end; /* * For hole punch round up the beginning offset of the hole and * round down the end. */ hole_start = round_up(offset, hpage_size); hole_end = round_down(offset + len, hpage_size); if (hole_end > hole_start) { struct address_space *mapping = inode->i_mapping; inode_lock(inode); i_mmap_lock_write(mapping); if (!RB_EMPTY_ROOT(&mapping->i_mmap)) hugetlb_vmdelete_list(&mapping->i_mmap, hole_start >> PAGE_SHIFT, hole_end >> PAGE_SHIFT); i_mmap_unlock_write(mapping); remove_inode_hugepages(inode, hole_start, hole_end); inode_unlock(inode); } return 0; }

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mike kravetzmike kravetz8159.12%116.67%
andrew mortonandrew morton3827.74%233.33%
andi kleenandi kleen118.03%116.67%
christoph hellwigchristoph hellwig53.65%116.67%
al viroal viro21.46%116.67%
Total137100.00%6100.00%


static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len) { struct inode *inode = file_inode(file); struct address_space *mapping = inode->i_mapping; struct hstate *h = hstate_inode(inode); struct vm_area_struct pseudo_vma; struct mm_struct *mm = current->mm; loff_t hpage_size = huge_page_size(h); unsigned long hpage_shift = huge_page_shift(h); pgoff_t start, index, end; int error; u32 hash; if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) return -EOPNOTSUPP; if (mode & FALLOC_FL_PUNCH_HOLE) return hugetlbfs_punch_hole(inode, offset, len); /* * Default preallocate case. * For this range, start is rounded down and end is rounded up * as well as being converted to page offsets. */ start = offset >> hpage_shift; end = (offset + len + hpage_size - 1) >> hpage_shift; inode_lock(inode); /* We need to check rlimit even when FALLOC_FL_KEEP_SIZE */ error = inode_newsize_ok(inode, offset + len); if (error) goto out; /* * Initialize a pseudo vma as this is required by the huge page * allocation routines. If NUMA is configured, use page index * as input to create an allocation policy. */ memset(&pseudo_vma, 0, sizeof(struct vm_area_struct)); pseudo_vma.vm_flags = (VM_HUGETLB | VM_MAYSHARE | VM_SHARED); pseudo_vma.vm_file = file; for (index = start; index < end; index++) { /* * This is supposed to be the vaddr where the page is being * faulted in, but we have no vaddr here. */ struct page *page; unsigned long addr; int avoid_reserve = 0; cond_resched(); /* * fallocate(2) manpage permits EINTR; we may have been * interrupted because we are using up too much memory. */ if (signal_pending(current)) { error = -EINTR; break; } /* Set numa allocation policy based on index */ hugetlb_set_vma_policy(&pseudo_vma, inode, index); /* addr is the offset within the file (zero based) */ addr = index * hpage_size; /* mutex taken here, fault path and hole punch */ hash = hugetlb_fault_mutex_hash(h, mm, &pseudo_vma, mapping, index, addr); mutex_lock(&hugetlb_fault_mutex_table[hash]); /* See if already present in mapping to avoid alloc/free */ page = find_get_page(mapping, index); if (page) { put_page(page); mutex_unlock(&hugetlb_fault_mutex_table[hash]); hugetlb_drop_vma_policy(&pseudo_vma); continue; } /* Allocate page and add to page cache */ page = alloc_huge_page(&pseudo_vma, addr, avoid_reserve); hugetlb_drop_vma_policy(&pseudo_vma); if (IS_ERR(page)) { mutex_unlock(&hugetlb_fault_mutex_table[hash]); error = PTR_ERR(page); goto out; } clear_huge_page(page, addr, pages_per_huge_page(h)); __SetPageUptodate(page); error = huge_add_to_page_cache(page, mapping, index); if (unlikely(error)) { put_page(page); mutex_unlock(&hugetlb_fault_mutex_table[hash]); goto out; } mutex_unlock(&hugetlb_fault_mutex_table[hash]); /* * page_put due to reference from alloc_huge_page() * unlock_page because locked by add_to_page_cache() */ put_page(page); unlock_page(page); } if (!(mode & FALLOC_FL_KEEP_SIZE) && offset + len > inode->i_size) i_size_write(inode, offset + len); inode->i_ctime = current_time(inode); out: inode_unlock(inode); return error; }

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mike kravetzmike kravetz48897.80%120.00%
deepa dinamanideepa dinamani40.80%120.00%
andrew mortonandrew morton40.80%120.00%
al viroal viro20.40%120.00%
andries brouwerandries brouwer10.20%120.00%
Total499100.00%5100.00%


static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr) { struct inode *inode = d_inode(dentry); struct hstate *h = hstate_inode(inode); int error; unsigned int ia_valid = attr->ia_valid; BUG_ON(!inode); error = setattr_prepare(dentry, attr); if (error) return error; if (ia_valid & ATTR_SIZE) { error = -EINVAL; if (attr->ia_size & ~huge_page_mask(h)) return -EINVAL; error = hugetlb_vmtruncate(inode, attr->ia_size); if (error) return error; } setattr_copy(inode, attr); mark_inode_dirty(inode); return 0; }

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mike kravetzmike kravetz12998.47%150.00%
jan karajan kara21.53%150.00%
Total131100.00%2100.00%


static struct inode *hugetlbfs_get_root(struct super_block *sb, struct hugetlbfs_config *config) { struct inode *inode; inode = new_inode(sb); if (inode) { struct hugetlbfs_inode_info *info; inode->i_ino = get_next_ino(); inode->i_mode = S_IFDIR | config->mode; inode->i_uid = config->uid; inode->i_gid = config->gid; inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); info = HUGETLBFS_I(inode); mpol_shared_policy_init(&info->policy, NULL); inode->i_op = &hugetlbfs_dir_inode_operations; inode->i_fop = &simple_dir_operations; /* directory inodes start off with i_nlink == 2 (for "." entry) */ inc_nlink(inode); lockdep_annotate_inode_mutex_key(